National Library of Energy BETA

Sample records for tropical convection visiting

  1. Arctic Stratus and Tropical Deep Convection. Integrating Measurements...

    Office of Scientific and Technical Information (OSTI)

    Technical Report: Arctic Stratus and Tropical Deep Convection. Integrating Measurements and Simulations Citation Details In-Document Search Title: Arctic Stratus and Tropical Deep ...

  2. Limiting Factors for Convective Cloud Top Height in the Tropics

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Limiting Factors for Convective Cloud Top Height in the Tropics M. P. Jensen and A. D. Del Genio National Aeronautics and Space Administration Goddard Institute for Space Studies Columbia University New York, New York Introduction Populations of tropical convective clouds are mainly comprised of three types: shallow trade cumulus, mid-level cumulus congestus and deep convective clouds (Johnson et al. 1999). Each of these cloud types has different impacts on the local radiation and water budgets.

  3. Patterns of Convection in the Tropical Western Pacific

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Patterns of Convection in the Tropical Western Pacific J. H. Mather Pacific Northwest National Laboratory Richland, Washington Introduction Convection is ubiquitous throughout the maritime continent region. However, the frequency of convec- tion is not uniform. While much of this region does not experience seasons to the same degree as one finds in mid-latitudes, the annual cycle of the sun's passage does have a large impact on convection throughout the maritime continent and the tropical

  4. Convection?

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    What is Tropical Convection? A Few of the Phenomena the Scientists are Studying - Madden-Julian Oscillation - Tropical Cyclones - El Niño and La Niña Definitions: - Atmospheric Convection - Equator - Intertropical Convergence Zone (ITCZ) - Monsoon - Ocean-Atmosphere System - Precipitation - Solar Energy - Tropical Cyclone - Tropical Disturbance Related Activity: Why is it Hotter at the Equator? EDUCATION NEWS Year of Tropical Convection With contributions from Hilary Wingert, 4 th grade

  5. Properties of tropical convection observed by ARM millimeter-radars

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Properties of tropical convection observed by ARM millimeter-radars Haynes, John Colorado State University Stephens, Graeme Colorado State University Category: Cloud Properties The results of an analysis of tropical cloud systems observed from a variety of vertically pointing radar systems are described. In particular, observations taken during five years of operation of the ARM millimeter wavelength radar system (MMCR) at Manus Island in the Tropical West Pacific region are characterized into

  6. ARM - Visiting the TWP

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    InactiveVisiting the TWP TWP Related Links Facilities and Instruments Manus Island Nauru Island Darwin, AUS ES&H Guidance Statement Operations Science Field Campaigns Year of Tropical Convection Visiting the Site TWP Fact Sheet Images Information for Guest Scientists Visiting the TWP Nauru Island from the air. Nauru Island from the air. The Tropical Western Pacific site consists of three diverse climate research facilities in Papua New Guinea, the Republic of Nauru, and Australia. Each

  7. Interactions between a tropical mixed boundary layer and cumulus convection in a radiative-convective model

    SciTech Connect (OSTI)

    Dean, C.L.

    1993-05-01

    This report details a radiative-convective model, combining previously developed cumulus, stable cloud and radiation parameterizations with a boundary layer scheme, which was developed in the current study. The cloud model was modified to incorporate the effects of both small and large clouds. The boundary layer model was adapted from a mixed layer model was only slightly modified to couple it with the more sophisticated cloud model. The model was tested for a variety of imposed divergence profiles, which simulate the regions of the tropical ocean from approximately the intertropical Convergence Zone (ITCZ) to the subtropical high region. The sounding used to initialize the model for most of the runs is from the trade wind region of ATEX. For each experiment, the model was run with a timestep of 300 seconds for a period of 7 days.

  8. ARM - Field Campaign - Year of Tropical Convection (YOTC)

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    ARM has three sites within the Tropical Western Pacific that were collecting data during this period: Manus, Papua New Guinea; Nauru Island; and Darwin, Australia. The ARM sites ...

  9. Coupled interactions of organized deep convection over the tropical western pacific

    SciTech Connect (OSTI)

    Hong, X.; Raman, S.

    1996-04-01

    The relationship between sea surface temperature (SST) and deep convection is complex. In general, deep convection occurs more frequently and with more intensity as SSTs become higher. This theory assumes that the atmospheric stability is sufficiently reduced to allow the onset of moist convection. However, the amount and intensity of convection observed tends to decrease with increasing SST because very warm SSTs. A reason for such decrease is the enhancements to surface fluxes of heat and moisture out of the ocean surface because of the vertical overturning associated with deep convection. Early studies used the radiative-convective models of the atmosphere to examine the role of the convective exchange of heat and moisture in maintaining the vertical temperature profile. In this paper we use a Coupled Ocean/Atmosphere Mesoscale Prediction System (COAMPS) to simulate a squall line over a tropical ocean global atmosphere/coupled ocean atmosphere response experiment (TOGA/COARE) area and to investigate how the ocean cooling mechanisms associated with organized deep convection act to limit tropical SSTs.

  10. Environment and the Lifetime of Tropical Deep Convection in a Cloud-Permitting Regional Model Simulation

    SciTech Connect (OSTI)

    Hagos, Samson M.; Feng, Zhe; McFarlane, Sally A.; Leung, Lai-Yung R.

    2013-08-01

    By applying a cloud tracking algorithm to tropical convective systems simulated by a regional high resolution model, the study documents environmental conditions before and after convective systems are initiated over ocean and land by following them during their lifetime. The comparative roles of various environmental fields in affecting the lifetime of convection are also quantified. The statistics of lifetime, maximum area, propagation speed and direction of the simulated deep convection agrees well with geostationary satellite observations. Over ocean, convective systems enhance surface fluxes through the associated wind gusts as well as cooling and drying of the boundary layer. A significant relationship is found between the mean surface fluxes during their lifetime and the longevity of the systems which in turn is related to the initial intensity of the moist updraft and to a lesser extent upper level shear. Over land, on the other hand, convective activity suppresses surface fluxes through cloud cover and the lifetime of convection is related to the upper level shear during their lifetime and strength of the heat fluxes several hours before the initiation of convection. For systems of equal lifetime, those over land are significantly more intense than those over ocean especially during early stages of their lifetime.

  11. Variability of radiatively forced diurnal cycle of intense convection in the tropical west pacific

    SciTech Connect (OSTI)

    Gray, W.M.; Sheaffer, J.D.; Thorson, W.B.

    1996-04-01

    Strong differences occur in daytime versus nighttime (DVN) net radiative cooling in clear versus cloudy areas of the tropical atmosphere. Daytime average cooling is approximately -0.7{degrees}C/day, whereas nighttime net tropospheric cooling rates are about -1.5{degrees}C/day, an approximately two-to-one difference. The comparatively strong nocturnal cooling in clear areas gives rise to a diurnally varying vertical circulation and horizontal convergence cycle. Various manifestations of this cyclic process include the observed early morning heavy rainfall maxima over the tropical oceans. The radiatively driven DVN circulation appears to strongly modulate the resulting diurnal cycle of intense convection which creates the highest, coldest cloudiness over maritime tropical areas and is likely a fundamental mechanism governing both small and large scale dynamics over much of the tropical environment.

  12. Final Technical Report for "Radiative Heating Associated with Tropical Convective Cloud Systems: Its Importance at Meso and Global Scales"

    SciTech Connect (OSTI)

    Schumacher, Courtney

    2012-12-13

    Heating associated with tropical cloud systems drive the global circulation. The overall research objectives of this project were to i) further quantify and understand the importance of heating in tropical convective cloud systems with innovative observational techniques, and ii) use global models to determine the large-scale circulation response to variability in tropical heating profiles, including anvil and cirrus cloud radiative forcing. The innovative observational techniques used a diversity of radar systems to create a climatology of vertical velocities associated with the full tropical convective cloud spectrum along with a dissection of the of the total heating profile of tropical cloud systems into separate components (i.e., the latent, radiative, and eddy sensible heating). These properties were used to validate storm-scale and global climate models (GCMs) and were further used to force two different types of GCMs (one with and one without interactive physics). While radiative heating was shown to account for about 20% of the total heating and did not have a strong direct response on the global circulation, the indirect response was important via its impact on convection, esp. in how radiative heating impacts the tilt of heating associated with the Madden-Julian Oscillation (MJO), a phenomenon that accounts for most tropical intraseasonal variability. This work shows strong promise in determining the sensitivity of climate models and climate processes to heating variations associated with cloud systems.

  13. Tropical Western Pacific

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    govSitesTropical Western Pacific TWP Related Links Facilities and Instruments Manus Island Nauru Island Darwin, AUS ES&H Guidance Statement Operations Science Field Campaigns Year of Tropical Convection Visiting the Site TWP Fact Sheet Images Information for Guest Scientists Tropical Western Pacific-Inactive Manus, Papua New Guinea: 2° 3' 39.64" S, 147° 25' 31.43" E Nauru Island: 0° 31' 15.6" S, 166° 54' 57.60" E Darwin, Australia: 12° 25' 28.56" S, 130° 53'

  14. Mechanisms of Convective Cloud Organization by Cold Pools over Tropical Warm Ocean during the AMIE/DYNAMO Field Campaign

    SciTech Connect (OSTI)

    Feng, Zhe; Hagos, Samson M.; Rowe, Angela; Burleyson, Casey D.; Martini, Matus; de Szoeke, S.

    2015-06-01

    This paper investigates the mechanisms of convective cloud organization by precipitation-driven cold pools over the warm tropical Indian Ocean during the 2011 Atmospheric Radiation Measurement (ARM) Madden-Julian Oscillation (MJO) Investigation Experiment / Dynamics of the MJO (AMIE/DYNAMO) field campaign. A high-resolution regional model simulation is performed using the Weather Research and Forecasting model during the transition from suppressed to active phases of the November 2011 MJO. The simulated cold pool lifetimes, spatial extent and thermodynamic properties agree well with the radar and ship-borne observations from the field campaign. The thermodynamic and dynamic structures of the outflow boundaries of isolated and intersecting cold pools in the simulation and the associated secondary cloud populations are examined. Intersecting cold pools last more than twice as long, are twice as large, 41% more intense (measured by buoyancy), and 62% deeper than isolated cold pools. Consequently, intersecting cold pools trigger 73% more convective clouds than isolated ones. This is possibly due to stronger outflows that enhance secondary updraft velocities by up to 45%. However, cold pool-triggered convective clouds grow into deep convection not because of the stronger secondary updrafts at cloud base, but rather due to closer spacing (aggregation) between clouds and larger cloud clusters that formed along the cold pool boundaries when they intersect. The close spacing of large clouds moistens the local environment and reduces entrainment drying, allowing the clouds to further develop into deep convection. Implications to the design of future convective parameterization with cold pool-modulated entrainment rates are discussed.

  15. Analysis of Cloud-resolving Simulations of a Tropical Mesoscale Convective System Observed during TWP-ICE: Vertical Fluxes and Draft Properties in Convective and Stratiform Regions

    SciTech Connect (OSTI)

    Mrowiec, Agnieszka A.; Rio, Catherine; Fridlind, Ann; Ackerman, Andrew; Del Genio, Anthony D.; Pauluis, Olivier; Varble, Adam; Fan, Jiwen

    2012-10-02

    We analyze three cloud-resolving model simulations of a strong convective event observed during the TWP-ICE campaign, differing in dynamical core, microphysical scheme or both. Based on simulated and observed radar reflectivity, simulations roughly reproduce observed convective and stratiform precipitating areas. To identify the characteristics of convective and stratiform drafts that are difficult to observe but relevant to climate model parameterization, independent vertical wind speed thresholds are calculated to capture 90% of total convective and stratiform updraft and downdraft mass fluxes. Convective updrafts are fairly consistent across simulations (likely owing to fixed large-scale forcings and surface conditions), except that hydrometeor loadings differ substantially. Convective downdraft and stratiform updraft and downdraft mass fluxes vary notably below the melting level, but share similar vertically uniform draft velocities despite differing hydrometeor loadings. All identified convective and stratiform downdrafts contain precipitation below ~10 km and nearly all updrafts are cloudy above the melting level. Cold pool properties diverge substantially in a manner that is consistent with convective downdraft mass flux differences below the melting level. Despite differences in hydrometeor loadings and cold pool properties, convective updraft and downdraft mass fluxes are linearly correlated with convective area, the ratio of ice in downdrafts to that in updrafts is ~0.5 independent of species, and the ratio of downdraft to updraft mass flux is ~0.5-0.6, which may represent a minimum evaporation efficiency under moist conditions. Hydrometeor loading in stratiform regions is found to be a fraction of hydrometeor loading in convective regions that ranges from ~10% (graupel) to ~90% (cloud ice). These findings may lead to improved convection parameterizations.

  16. Radiative Heating Profiles in the Convective Tropics: A Comparison of Observations and Models

    SciTech Connect (OSTI)

    McFarlane, Sally A.; Mather, Jim H.; Ackerman, Thomas P.

    2005-01-10

    Radiative heating is one of the principal drivers of tropical circulation. While we have good knowledge of radiative fluxes at the top-of-atmosphere and at specific surface sites, observations of atmospheric profiles of radiative heating, particular in cloudy conditions, have been largely unavailable. The Atmospheric Radiation Measurement (ARM) Program has begun a program to compute radiative heating profiles routinely at its observational sites at Nauru and Manus Island, Papua New Guinea, using observed and retrieved inputs of water vapor and condensed water phase, particle size, and mass. The accuracy of these profiles can be assessed by comparing the calculated TOA and surface fluxes with observations. We have computed radiative heating profiles every 20 minutes for several months at each of these two sites in the 1999-2000 time period, which represent a unique dataset for model comparison. Here, we compare this dataset to model output from the European Center for Medium-Range Weather Forecasting (ECMWF) analysis, the NCAR Community Atmosphere Model (CAM 3.0) and the Multi-Scale Modeling Framework (MMF). These three models, all run using observed SST for this comparison, provide an interesting range of resolution from the 4 km cloud resolving model in the MMF to the approximately 280 km grid-scale of the CAM and a contrast between forecasting and climate models. In general, the model results fail to capture the structure of the observed heating in the upper troposphere because of their failure to simulate cirrus and stratiform cloud adequately.

  17. Constructing a Merged Cloud-Precipitation Radar Dataset for Tropical Convective Clouds during the DYNAMO/AMIE Experiment at Addu Atoll

    SciTech Connect (OSTI)

    Feng, Zhe; McFarlane, Sally A.; Schumacher, Courtney; Ellis, Scott; Comstock, Jennifer M.; Bharadwaj, Nitin

    2014-05-16

    To improve understanding of the convective processes key to the Madden-Julian-Oscillation (MJO) initiation, the Dynamics of the MJO (DYNAMO) and Atmospheric Radiation Measurement MJO Investigation Experiment (AMIE) collected four months of observations from three radars, the S-band Polarization Radar (S-Pol), the C-band Shared Mobile Atmospheric Research & Teaching Radar (SMART-R), and Ka-band Zenith Radar (KAZR) on Addu Atoll in the tropical Indian Ocean. This study compares the measurements from the S-Pol and SMART-R to those from the more sensitive KAZR in order to characterize the hydrometeor detection capabilities of the two scanning precipitation radars. Frequency comparisons for precipitating convective clouds and non-precipitating high clouds agree much better than non-precipitating low clouds for both scanning radars due to issues in ground clutter. On average, SMART-R underestimates convective and high cloud tops by 0.3 to 1.1 km, while S-Pol underestimates cloud tops by less than 0.4 km for these cloud types. S-Pol shows excellent dynamic range in detecting various types of clouds and therefore its data are well suited for characterizing the evolution of the 3D cloud structures, complementing the profiling KAZR measurements. For detecting non-precipitating low clouds and thin cirrus clouds, KAZR remains the most reliable instrument. However, KAZR is attenuated in heavy precipitation and underestimates cloud top height due to rainfall attenuation 4.3% of the time during DYNAMO/AMIE. An empirical method to correct the KAZR cloud top heights is described, and a merged radar dataset is produced to provide improved cloud boundary estimates, microphysics and radiative heating retrievals.

  18. Visiting Dignitaries

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    U.S. Deputy Energy Secretary Daniel Poneman (right) looks at a model of a plutonium heat source that is used on U.S. space missions during the Deputy Secretary's visit to the Idaho ...

  19. Visit Us

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    visit us Visit Us Download the NIF Visitor's Brochure (PDF) Public Tours Public tours of the NIF site can be arranged by contacting the LLNL Public Affairs Office at (925) 422-4599 (see Tours). Directions Get maps and directions to Lawrence Livermore National Laboratory (LLNL). Tours of NIF originate at LLNL's Discovery Center, located off Greenville Road at Eastgate Drive. Lawrence Livermore National Laboratory is located off Vasco Road, near Interstate 580, in Livermore, California, about 50

  20. Visiting CAMS

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    home / visiting cams Visiting CAMS Research Visitors The CAMS facility is open to researchers from around the world and has been an important training resource for the U.S. and international science community. As an institute within LLNL, CAMS has a strong track record in hosting under graduate and graduate students and post-doctoral researchers. Scientists and students are encouraged to participate in AMS runs analyzing their samples and, when possible, assist in the preparation of samples

  1. Intersecting Cold Pools: Convective Cloud Organization by Cold...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Intersecting Cold Pools: Convective Cloud Organization by Cold Pools over Tropical Ocean For original submission and image(s), see ARM Research Highlights http:www.arm.gov...

  2. Visiting | Advanced Photon Source

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Visiting the APS If you have questions or need assistance planning your visit, please contact the APS User Office. Obtaining site access: General info: Visitors and new users |...

  3. WarpVisit

    Energy Science and Technology Software Center (OSTI)

    2015-06-10

    WarpVisit is an insitu simulation application that integrates the Warp laser plasma accelerator simulation framework with Visit a parallel visualization application. WarpVisit is written in python and supports interactive or live mode where user can connect to Warp with the Visit GUI and batch mode for batch for non-interactive use on high-performance computing resources.

  4. Visit JCAP - JCAP

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    ©bobpaz.com0036-copy_v2.jpg Visit JCAP Connect With JCAP Contact Us Partnerships For Researchers Partnerships For Industry Visit JCAP Connect with JCAP Contact Us Partnerships For Researchers Partnerships For Industry Visit JCAP Arranging A Visit To JCAP Scheduled tours of JCAP's headquarters and primary laboratory facilities in Pasadena, California, are available to student groups (grades 10 and up) and members of the research community with advance reservations. Scheduled tours of JCAP's

  5. ORISE: Visiting Us

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Visiting Us If you are visiting the Oak Ridge Institute for Science and Education (ORISE) and need assistance locating our main campus in Oak Ridge, Tenn., or one of our program offices across the country, browse the maps below to find detailed directions. Area information for Oak Ridge and Knoxville is also provided for those visiting the ORISE main campus. Office Locations Find ORISE facilities across the country, including maps and directions. Map Directions and Search Results Visitor

  6. ARM - Visiting the SGP

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    PlainsVisiting the SGP SGP Related Links Virtual Tour Facilities and Instruments Central Facility Boundary Facility Extended Facility Intermediate Facility Radiometric Calibration Facility Geographic Information ES&H Guidance Statement Operations Science Field Campaigns Visiting the Site Summer Training SGP Fact Sheet Images Information for Guest Scientists Contacts Visiting the SGP View a custom Google map with driving directions to the SGP Central Facility. View a custom Google map with

  7. Visiting Scientists and Professionals

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    visiting scientists and professionals Visiting Scientists and Professionals It is the responsibility of all Visiting Scientists & Professionals (VSP) to: Understand their tasks Understand the potential hazards associated with their experiment(s) Comply fully with all LLNL safety and computer security regulations and procedures. Based on the recommendation and justification provided by the pertinent Designated Team Leader (DTL), VSPs can be evaluated by the Laser Facility Operations Manager

  8. Visiting Faculty Program

    Broader source: Energy.gov [DOE]

    The Visiting Faculty Program (VFP), formerly called Faculty and Student Teams (FaST), seeks to increase the research competitiveness of faculty members and their students at institutions...

  9. Congressman Visits OREM

    Broader source: Energy.gov [DOE]

    Tennessee’s third district Representative Chuck Fleishman visits OREM to receive updates about cleanup projects happening and planned across the Energy Department’s Oak Ridge Reservation.

  10. Planning a visit?

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    information: Location of your school program: Number of students coming to visit: Ages or grades of students: Any comments or questions you may have Submit Reset Teachers...

  11. Visiting NREL | NREL

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Visiting NREL To plan your visit, select the location below. Not sure? Contact your NREL host to confirm the location for your meeting. NREL Golden Campus, Laboratories, and Administrative Offices National Wind Technology Center Education Center Washington, D.C. Office Community Members and General Public Sign up for an NREL tour or group program. LEARN MORE

  12. Convection towers

    DOE Patents [OSTI]

    Prueitt, Melvin L.

    1995-01-01

    Convection towers which are capable of cleaning the pollution from large quantities of air, of generating electricity, and of producing fresh water utilize the evaporation of water sprayed into the towers to create strong airflows and to remove pollution from the air. Turbines in tunnels at the skirt section of the towers generate electricity, and condensers produce fresh water.

  13. Convection towers

    DOE Patents [OSTI]

    Prueitt, Melvin L.

    1994-01-01

    Convection towers which are capable of cleaning the pollution from large quantities of air and of generating electricity utilize the evaporation of water sprayed into the towers to create strong airflows and to remove pollution from the air. Turbines in tunnels at the skirt section of the towers generate electricity. Other embodiments may also provide fresh water, and operate in an updraft mode.

  14. Convection towers

    DOE Patents [OSTI]

    Prueitt, Melvin L.

    1996-01-01

    Convection towers which are capable of cleaning the pollution from large quantities of air, of generating electricity, and of producing fresh water utilize the evaporation of water sprayed into the towers to create strong airflows and to remove pollution from the air. Turbines in tunnels at the skirt section of the towers generate electricity, and condensers produce fresh water.

  15. Convection towers

    DOE Patents [OSTI]

    Prueitt, M.L.

    1996-01-16

    Convection towers which are capable of cleaning the pollution from large quantities of air, of generating electricity, and of producing fresh water utilize the evaporation of water sprayed into the towers to create strong airflows and to remove pollution from the air. Turbines in tunnels at the skirt section of the towers generate electricity, and condensers produce fresh water. 6 figs.

  16. Reactor Engineering: Experimental Investigation of Alpha Convection

    SciTech Connect (OSTI)

    Usman, Shoaib

    2012-10-12

    Natural convection, Rayleigh-Bernard convection, Transient convection and Conduction convection transition.

  17. We Visit You

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    We Visit You We Visit You Science on Wheels' educators bring interactive classroom programs to your school. August 18, 2014 science on wheels van Science on Wheels: we drive our van to your school. During the school year, the Bradbury Science Museum Educators drive our van to schools in our region on Tuesdays and Thursdays. We visit with at least two classes in one location at the school for 1-hour sessions. These programs are provided free of charge to your site. Our programs are participatory

  18. ARM - Visiting the NSA

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AlaskaVisiting the NSA NSA Related Links Virtual Tour Facilities and Instruments Barrow Atqasuk Oliktok Point (AMF3) ES&H Guidance Statement Operations Science Field Campaigns Visiting the Site NSA Fact Sheet Images Information for Guest Scientists Contacts Visiting the NSA View a custom Google map with driving directions to the Barrow site. Zoom in on the map for more detail. View a custom Google map with driving directions to the Barrow site. Zoom in on the map for more detail. Safety

  19. Senator Murray Visits Hanford

    Broader source: Energy.gov [DOE]

    U.S. Sen. Patty Murray (D-Wash.) visited the Hanford site in Washington state recently, where she received an update on activities at C Farm, which is one of the groups of underground waste tanks at Hanford.

  20. Home Weatherization Visit

    Broader source: Energy.gov [DOE]

    Secretary Steven Chu visits a home that is in the process of being weatherized in Columbus, OH, along with Ohio Governor Ted Strickland and Columbus Mayor Michael Coleman. They discuss the benefits...

  1. PNNL: Secretary Moniz Visit

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Energy Secretary Moniz visits PNNL Ernest Moniz Ernest Moniz Courtesy of US Department of Energy The only certified U.S. radionuclide laboratory for the International Monitoring System of the Comprehensive Nuclear-Test-Ban Treaty (CTBT) was one of a few stops Energy Secretary Ernest Moniz made when he visited PNNL Aug. 16. The Shallow Underground Laboratory at PNNL contains some of the world's most sensitive radiation detection instruments where measurements are made on samples collected through

  2. Plan Your Visit

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Visit Plan your visit to the museum Experience 40 interactive exhibits revealing nuclear defense history and the research in life sciences, material sciences, space, supercomputing, energy and the environment. August 18, 2014 Visitor in an interactive exhibit Contact Us thumbnail of Tu - Sat: 10 - 5 PM Su & Mon: 1 - 5 PM Free Admission Bradbury Science Museum, 1350 Central Avenue Tu - Sat: 10 - 5 PM Su & Mon: 1 - 5 PM Free Admission Open every day except Thanksgiving, Christmas, and New

  3. Convection towers

    DOE Patents [OSTI]

    Prueitt, M.L.

    1994-02-08

    Convection towers which are capable of cleaning the pollution from large quantities of air and of generating electricity utilize the evaporation of water sprayed into the towers to create strong airflows and to remove pollution from the air. Turbines in tunnels at the skirt section of the towers generate electricity. Other embodiments may also provide fresh water, and operate in an updraft mode. 5 figures.

  4. Large Group Visits

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Large Group Visits Large Group Visits All tours of the Museum are self-guided, but please schedule in advance so we can best accommodate your group. Contact Us thumbnail of 1350 Central Avenue (505) 667-4444 Email Let us know if you plan to bring a group of 10 or more. All tours of the Museum are self-guided, but please schedule in advance so we can best accommodate your group. Parking for buses and RVs is available on Iris Street behind the Museum off of 15th St. See attached map (pdf). Contact

  5. CONVECTION REACTOR

    DOE Patents [OSTI]

    Hammond, R.P.; King, L.D.P.

    1960-03-22

    An homogeneous nuclear power reactor utilizing convection circulation of the liquid fuel is proposed. The reactor has an internal heat exchanger looated in the same pressure vessel as the critical assembly, thereby eliminating necessity for handling the hot liquid fuel outside the reactor pressure vessel during normal operation. The liquid fuel used in this reactor eliminates the necessity for extensive radiolytic gas rocombination apparatus, and the reactor is resiliently pressurized and, without any movable mechanical apparatus, automatically regulates itself to the condition of criticality during moderate variations in temperature snd pressure and shuts itself down as the pressure exceeds a predetermined safe operating value.

  6. Congressman Clyburn Visit

    ScienceCinema (OSTI)

    Cody, Tom

    2012-06-14

    Congressman James Clyburn visits the new employees of the Savannah River Site. These new jobs the graduates have received are a result of the Recovery Act at work. Lisa Jackson of the Environmental Protection Agency speaks about how the ARRA is in line with President Obama's vision of a better economy and cleaner environment.

  7. Home Weatherization Visit

    ScienceCinema (OSTI)

    Chu, Steven

    2013-05-29

    Secretary Steven Chu visits a home that is in the process of being weatherized in Columbus, OH, along with Ohio Governor Ted Strickland and Columbus Mayor Michael Coleman. They discuss the benefits of weatherization and how funding from the recovery act is having a direct impact in communities across America.

  8. Convective heater

    DOE Patents [OSTI]

    Thorogood, Robert M.

    1986-01-01

    A convective heater for heating fluids such as a coal slurry is constructed of a tube circuit arrangement which obtains an optimum temperature distribution to give a relatively constant slurry film temperature. The heater is constructed to divide the heating gas flow into two equal paths and the tube circuit for the slurry is arranged to provide a mixed flow configuration whereby the slurry passes through the two heating gas paths in successive co-current, counter-current and co-current flow relative to the heating gas flow. This arrangement permits the utilization of minimum surface area for a given maximum film temperature of the slurry consistent with the prevention of coke formation.

  9. Convective heater

    DOE Patents [OSTI]

    Thorogood, Robert M.

    1983-01-01

    A convective heater for heating fluids such as a coal slurry is constructed of a tube circuit arrangement which obtains an optimum temperature distribution to give a relatively constant slurry film temperature. The heater is constructed to divide the heating gas flow into two equal paths and the tube circuit for the slurry is arranged to provide a mixed flow configuration whereby the slurry passes through the two heating gas paths in successive co-current, counter-current and co-current flow relative to the heating gas flow. This arrangement permits the utilization of minimum surface area for a given maximum film temperature of the slurry consistent with the prevention of coke formation.

  10. Convective heater

    DOE Patents [OSTI]

    Thorogood, R.M.

    1983-12-27

    A convective heater for heating fluids such as a coal slurry is constructed of a tube circuit arrangement which obtains an optimum temperature distribution to give a relatively constant slurry film temperature. The heater is constructed to divide the heating gas flow into two equal paths and the tube circuit for the slurry is arranged to provide a mixed flow configuration whereby the slurry passes through the two heating gas paths in successive co-current, counter-current and co-current flow relative to the heating gas flow. This arrangement permits the utilization of minimum surface area for a given maximum film temperature of the slurry consistent with the prevention of coke formation. 14 figs.

  11. ARM Convective Available Potential Energy (CAPE), Convective...

    Office of Scientific and Technical Information (OSTI)

    Country of Publication: United States Availability: ORNL Language: English Subject: 54 Environmental Sciences ARMBE, Soundings; Convective Available Potential Energy (CAPE); ...

  12. Fermilab | Visit Fermilab

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    feature photo feature photo feature photo feature photo feature photo Visit Fermilab Navbar Toggle About Quick Info Science History Leadership and Organization Leadership Organizational chart Committees and Councils Photo and Video Gallery Diversity Education Safety Sustainability and Environment Contact Related Links DOE FRA UChicago URA Newsroom Spotlight Press releases Fact sheets and brochures symmetry Interactions.org Photo and video archive Resources for ... Employees Researchers, postdocs

  13. Fermilab | Visit Fermilab | Colloquium

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Visit Fermilab Navbar Toggle About Quick Info Science History Leadership and Organization Leadership Organizational chart Committees and Councils Photo and Video Gallery Diversity Education Safety Sustainability and Environment Contact Related Links DOE FRA UChicago URA Newsroom Spotlight Press releases Fact sheets and brochures symmetry Interactions.org Photo and video archive Resources for ... Employees Researchers, postdocs and graduate students Job seekers Neighbors Industry K-12 students,

  14. 88-Inch Site Visit - 88-Inch Cyclotron

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    88-Inch Site Visit For information regarding the 88-Inch Cyclotron Site Visit, please click here.

  15. CONTENTS OF A VISIT REQUEST

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    CONTENTS OF A VISIT REQUEST All visit requests are required to be submitted via JPAS according to AFI 31-101 and the NISPOM. Our SMO code is KV1MFSCC6. Please do not send an annual visit request for the conference. Use the dates of the conference for the duration of the visit. Please list Bing Serafico, 505-853-0451 as the Point of Contract for the visit. NOTE: Only use the following information if your companies DO NOT have access to JPAS. All faxed visit request for personnel that are in JPAS

  16. CHARACTERIZATION OF CLOUDS IN TITAN'S TROPICAL ATMOSPHERE

    SciTech Connect (OSTI)

    Griffith, Caitlin A.; Penteado, Paulo; Rodriguez, Sebastien; Baines, Kevin H.; Buratti, Bonnie; Sotin, Christophe; Clark, Roger; Nicholson, Phil; Jaumann, Ralf

    2009-09-10

    Images of Titan's clouds, possible over the past 10 years, indicate primarily discrete convective methane clouds near the south and north poles and an immense stratiform cloud, likely composed of ethane, around the north pole. Here we present spectral images from Cassini's Visual Mapping Infrared Spectrometer that reveal the increasing presence of clouds in Titan's tropical atmosphere. Radiative transfer analyses indicate similarities between summer polar and tropical methane clouds. Like their southern counterparts, tropical clouds consist of particles exceeding 5 {mu}m. They display discrete structures suggestive of convective cumuli. They prevail at a specific latitude band between 8 deg. - 20 deg. S, indicative of a circulation origin and the beginning of a circulation turnover. Yet, unlike the high latitude clouds that often reach 45 km altitude, these discrete tropical clouds, so far, remain capped to altitudes below 26 km. Such low convective clouds are consistent with the highly stable atmospheric conditions measured at the Huygens landing site. Their characteristics suggest that Titan's tropical atmosphere has a dry climate unlike the south polar atmosphere, and despite the numerous washes that carve the tropical landscape.

  17. The Energy Department Prepares for Tropical Storm Karen | Department of

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Energy The Energy Department Prepares for Tropical Storm Karen The Energy Department Prepares for Tropical Storm Karen October 4, 2013 - 3:00pm Addthis Marissa Newhall Marissa Newhall Director of Digital Strategy and Communications What does this mean for me? Follow the latest news on Tropical Storm Karen by visiting the FEMA blog. Stay up-to-date on energy delivery impacts by reading twice-daily situation reports from the Energy Department. Visit ready.gov for more information about

  18. Unclassified Foreign Visits and Assignments

    Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

    2004-06-18

    To define a program for unclassified foreign national access to Department of Energy sites, information, and technologies. This Order cancels DOE P 142.1, Unclassified Foreign Visits and Assignments, dated 7-14-99; DOE N 142.1, Unclassified Foreign Visits and Assignments, dated 7-14-99; Secretarial Memorandum Unclassified Foreign Visits and Assignments, dated 7-14-99; Memorandum from Francis S. Blake, Departmental Use of Foreign Access Central Tracking System, dated 11-05-01; Memorandum from Kyle E. McSlarrow, Interim Guidance for Implementation of the Department's Unclassified Foreign Visits and Assignments Program, dated 12-17-02; and Secretarial Memorandum, Policy Exclusion for Unclassified Foreign National's Access to Department of Energy Facilities in Urgent or Emergency Medical Situations, dated 4-10-01. Cancels: DOE P 142.1 and DOE N 142.1

  19. Unclassified Foreign Visits and Assignments

    Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

    1999-07-14

    To provide interim Department of Energy (DOE) requirements and responsibilities for unclassified visits and assignment by foreign nationals to DOE facilities for unclassified activities. This Notice supplements DOE P 142.1 dated 7-14-99, which sets overall Departmental policy on unclassified foreign visits and assignments. It is a complement to existing counterintelligence and security orders and policies. DOE N 251.53, dated 05/14/03, extends this directive until canceled. Cancels: DOE 1240.2B

  20. Visiting Faculty Program Program Description

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Visiting Faculty Program Program Description The Visiting Faculty Program seeks to increase the research competitiveness of faculty members and their students at institutions historically underrepresented in the research community in order to expand the workforce vital to Department of Energy mission areas. As part of the program, selected university/college faculty members collaborate with DOE laboratory research staff on a research project of mutual interest. Program Objective The program is

  1. Convective Radio Occultations Campaign

    Office of Scientific and Technical Information (OSTI)

    The intensity forecast and monitoring of convective systems is one of the major challenges ... measurements in combination with atmospheric profiles from Global Positioning System ...

  2. ARM - PI Product - Convective Available Potential Energy (CAPE), Convective

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Inhibition (CIN) Product Products Convective Available Potential Energy (CAPE), Convective Inhibition (CIN) Product ARM Data Discovery Browse Data Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send PI Product : Convective Available Potential Energy (CAPE), Convective Inhibition (CIN) Product ARM soundings are used to determine Convective Available Potential Energy (CAPE), Convective Inhibition (CIN) and associated properties. Data Details

  3. University of Delaware | CCEI Visiting Scholars

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Visiting Scholars Adriano Freitas de Sousa- Visiting Student Universidade Federal do Cear Advisor: Vlachos, Dion Office: 367 ISE Lab Phone: (302) 831-4061 Email: Send email...

  4. Foreign National Visit/Assignment Questionnaire

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Unclassified Foreign National Visits & Assignments Questionnaire Welcome to Department of Energy, Headquarters We are looking forward to your visit or assignment with us. In ...

  5. Nuclear Energy Advisory Committee, Facility Subcommittee visit...

    Broader source: Energy.gov (indexed) [DOE]

    Facility Subcommittee visit to Idaho National Laboratory May 19-20, 2010 The Nuclear Energy Advisory Committee, Facility Subcommittee visited the Idaho National...

  6. ARM Convective Available Potential Energy (CAPE), Convective Inhibition (CIN) Product

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Jensen, Michael

    2014-04-10

    ARM soundings are used to determine Convective Available Potential Energy (CAPE), Convective Inhibition (CIN) and associated properties, using the following relationships;

  7. ARM Convective Available Potential Energy (CAPE), Convective Inhibition (CIN) Product

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Jensen, Michael

    ARM soundings are used to determine Convective Available Potential Energy (CAPE), Convective Inhibition (CIN) and associated properties, using the following relationships;

  8. About an Optimal Visiting Problem

    SciTech Connect (OSTI)

    Bagagiolo, Fabio Benetton, Michela

    2012-02-15

    In this paper we are concerned with the optimal control problem consisting in minimizing the time for reaching (visiting) a fixed number of target sets, in particular more than one target. Such a problem is of course reminiscent of the famous 'Traveling Salesman Problem' and brings all its computational difficulties. Our aim is to apply the dynamic programming technique in order to characterize the value function of the problem as the unique viscosity solution of a suitable Hamilton-Jacobi equation. We introduce some 'external' variables, one per target, which keep in memory whether the corresponding target is already visited or not, and we transform the visiting problem in a suitable Mayer problem. This fact allows us to overcome the lacking of the Dynamic Programming Principle for the originary problem. The external variables evolve with a hysteresis law and the Hamilton-Jacobi equation turns out to be discontinuous.

  9. S1 Visit | Jefferson Lab

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    S1 Visit S1 Visit March 27, 2014 In this country, we seem to depend on acronyms and abbreviations. For example, at the top, I guess, is POTUS (President of the United States); I have been told that people working in or close to the White House, such as in the Office of Science and Technology Policy, actually use that term, although it is not so much in evidence in Newport News. On the other hand, SC2 (Office of Science Deputy, Pat Dehmer), and SC3 (Head of SC Operations, Joe McBrearty) are

  10. Unclassified Foreign Visits and Assignments

    Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

    1999-07-14

    International cooperation and collaboration is an important element in the effective planning and implementation of many Department of Energy (DOE) programs. DOE and its international partners benefit from the exchange of information that results from a managed process of unclassified visits and assignments by foreign nationals. These visits and assignments must be conducted in a manner consistent with U.S. and DOE national security policies, requirements, and objectives including export control laws and regulations. Canceled by DOE O 142.3. Does not cancel other directives.

  11. About SRNL - Visiting the Savannah River National Laboratory

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    5 SEARCH SRNL GO From the Director Operational Excellence Leadership Directorates Our History Visiting SRNL SRNL Home Visiting SRNL Visiting SRNL About SRNL Visiting the Savannah...

  12. Unclassified Foreign National Visits & Assignments Questionnaire |

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Department of Energy Services » Calibration Facilities » Unclassified Foreign National Visits & Assignments Questionnaire Unclassified Foreign National Visits & Assignments Questionnaire Visitors who are foreign nationals must complete and submit the Unclassified Foreign National Visits & Assignments Questionnaire 30 days before accessing facilities. Unclassified Foreign National Visits & Assignments Questionnaire (192.5 KB) More Documents & Publications HQ FNVA

  13. Visit on Cooley | Argonne Leadership Computing Facility

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Visit on Cooley Getting Started On your local machine: Download (https://wci.llnl.gov/codes/visit/download.html) and install VisIt (The most recent version installed on Cooley is 2.10.0. Versions 2.9.1 and 2.7.3 is also available.) Download the Cooley host profile for VisIt (you may need to right-click and choose "Save link as..." or "Save target as...") Copy this file to a file called ~/.visit/hosts/host_anl_cooley.xml Running VisIt in Interactive Mode Start up VisIt on your

  14. visit | National Nuclear Security Administration

    National Nuclear Security Administration (NNSA)

    visit NNSA Hosts NPT Parties at Los Alamos and Sandia National Laboratories WASHINGTON D.C. - On March 25-27, 2015, the National Nuclear Security Administration (NNSA) hosted representatives from 11 States Parties to the Treaty on the Non-Proliferation of Nuclear Weapons (NPT) and one representative from the United Nations Office for Disarmament Affairs. The

  15. Classified Visits Involving Foreign Nationals

    Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

    2004-01-13

    The Order establishes a program to manage the Department-wide program to facilitate, document, and assure accountability when approving foreign national access to classified DOE programs and facilities. Cancels portions of Chapter VIII, of DOE O 470.1 that pertain to foreign nationals who visit DOE sitess and require access to classified information. Canceled by DOE O 470.4B.

  16. Visit

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    About Energy.gov » News & Blog » Videos Videos Video Title Topics - Any - Tax Credits, Rebates, Savings Energy Efficiency -Homes --Heating & Cooling ---Heating ---Cooling ---Heat Pumps --Water Heating ---Swimming Pool Heaters --Home Weatherization ---Home Energy Audits ---Insulation ---Sealing Your Home ---Ventilation --Saving Electricity ---Lighting ---Appliances & Electronics ---Buying & Making Electricity --Design & Remodeling ---Windows, Doors, & Skylights

  17. Lagrangian Diagnostics of Tropical Cirrus over TWP CART Sites

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Lagrangian Diagnostics of Tropical Cirrus over TWP CART Sites Horvath, Akos University of Miami Soden, Brian UM/RSMAS Category: Cloud Properties Cirrus clouds associated with tropical deep convection play an important role in regulating Earth's climate by influencing the radiative and moisture budgets of the upper troposphere. In this study, we sought to better understand the evolution of such clouds using geostationary satellite observations coupled with ground-based radar and lidar

  18. ARM - Measurement - Convection

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    govMeasurementsConvection ARM Data Discovery Browse Data Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Measurement : Convection Vertical motion within the atmosphere due to thermal instability, with important impacts on the type cloud systems that can develop. Categories Atmospheric State Instruments The above measurement is considered scientifically relevant for the following instruments. Refer to the datastream (netcdf) file headers of each

  19. LANSCE | About LANSCE | Visiting LANSCE

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Los Alamos Neutron Science Center lansce.lanl.gov lansce-user-office@lanl.gov mesa header Beam Status Accelerator Ops (Internal) Operating Schedule Long Range Operating Schedule User Resources User Agreements Proposals Visit Registration Schedules Experiment Reports User Satisfaction Survey Reviews Users User Office User Program LANSCE User Group Rosen Scholar Rosen Prize News & Multimedia News Multimedia Events Profiles Highlights Seminars Activity Reports The Pulse User Program Headlines

  20. VisIt - 3D Scientific Visualization

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    VisIt VisIt - 3D Scientific Visualization Description and Overview VisIt is a point-and-click 3D scientific visualization application that supports most common visualization techniques (e.g., iso-contouring and volume rendering) on structured and unstructured grids. Due to its distributed and parallel architecture, VisIt is able to handle very large datasets interactively. In addition, VisIt is extensible, allowing users to add data loaders or additional analysis tools to VisIt. The NERSC

  1. Parameterizing deep convection using the assumed probability density function method

    SciTech Connect (OSTI)

    Storer, R. L.; Griffin, B. M.; Hoft, Jan; Weber, J. K.; Raut, E.; Larson, Vincent E.; Wang, Minghuai; Rasch, Philip J.

    2015-01-06

    Due to their coarse horizontal resolution, present-day climate models must parameterize deep convection. This paper presents single-column simulations of deep convection using a probability density function (PDF) parameterization. The PDF parameterization predicts the PDF of subgrid variability of turbulence, clouds, and hydrometeors. That variability is interfaced to a prognostic microphysics scheme using a Monte Carlo sampling method.The PDF parameterization is used to simulate tropical deep convection, the transition from shallow to deep convection over land, and mid-latitude deep convection.These parameterized single-column simulations are compared with 3-D reference simulations. The agreement is satisfactory except when the convective forcing is weak. The same PDF parameterization is also used to simulate shallow cumulus and stratocumulus layers. The PDF method is sufficiently general to adequately simulate these five deep, shallow, and stratiform cloud cases with a single equation set. This raises hopes that it may be possible in the future, with further refinements at coarse time step and grid spacing, to parameterize all cloud types in a large-scale model in a unified way.

  2. Parameterizing deep convection using the assumed probability density function method

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Storer, R. L.; Griffin, B. M.; Höft, J.; Weber, J. K.; Raut, E.; Larson, V. E.; Wang, M.; Rasch, P. J.

    2015-01-06

    Due to their coarse horizontal resolution, present-day climate models must parameterize deep convection. This paper presents single-column simulations of deep convection using a probability density function (PDF) parameterization. The PDF parameterization predicts the PDF of subgrid variability of turbulence, clouds, and hydrometeors. That variability is interfaced to a prognostic microphysics scheme using a Monte Carlo sampling method. The PDF parameterization is used to simulate tropical deep convection, the transition from shallow to deep convection over land, and midlatitude deep convection. These parameterized single-column simulations are compared with 3-D reference simulations. The agreement is satisfactory except when the convective forcing ismore » weak. The same PDF parameterization is also used to simulate shallow cumulus and stratocumulus layers. The PDF method is sufficiently general to adequately simulate these five deep, shallow, and stratiform cloud cases with a single equation set. This raises hopes that it may be possible in the future, with further refinements at coarse time step and grid spacing, to parameterize all cloud types in a large-scale model in a unified way.« less

  3. Parameterizing deep convection using the assumed probability density function method

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Storer, R. L.; Griffin, B. M.; Höft, J.; Weber, J. K.; Raut, E.; Larson, V. E.; Wang, M.; Rasch, P. J.

    2014-06-11

    Due to their coarse horizontal resolution, present-day climate models must parameterize deep convection. This paper presents single-column simulations of deep convection using a probability density function (PDF) parameterization. The PDF parameterization predicts the PDF of subgrid variability of turbulence, clouds, and hydrometeors. That variability is interfaced to a prognostic microphysics scheme using a Monte Carlo sampling method. The PDF parameterization is used to simulate tropical deep convection, the transition from shallow to deep convection over land, and mid-latitude deep convection. These parameterized single-column simulations are compared with 3-D reference simulations. The agreement is satisfactory except when the convective forcing ismore » weak. The same PDF parameterization is also used to simulate shallow cumulus and stratocumulus layers. The PDF method is sufficiently general to adequately simulate these five deep, shallow, and stratiform cloud cases with a single equation set. This raises hopes that it may be possible in the future, with further refinements at coarse time step and grid spacing, to parameterize all cloud types in a large-scale model in a unified way.« less

  4. Parameterizing deep convection using the assumed probability density function method

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Storer, R. L.; Griffin, B. M.; Hft, J.; Weber, J. K.; Raut, E.; Larson, V. E.; Wang, M.; Rasch, P. J.

    2015-01-06

    Due to their coarse horizontal resolution, present-day climate models must parameterize deep convection. This paper presents single-column simulations of deep convection using a probability density function (PDF) parameterization. The PDF parameterization predicts the PDF of subgrid variability of turbulence, clouds, and hydrometeors. That variability is interfaced to a prognostic microphysics scheme using a Monte Carlo sampling method.The PDF parameterization is used to simulate tropical deep convection, the transition from shallow to deep convection over land, and midlatitude deep convection. These parameterized single-column simulations are compared with 3-D reference simulations. The agreement is satisfactory except when the convective forcing is weak.moreThe same PDF parameterization is also used to simulate shallow cumulus and stratocumulus layers. The PDF method is sufficiently general to adequately simulate these five deep, shallow, and stratiform cloud cases with a single equation set. This raises hopes that it may be possible in the future, with further refinements at coarse time step and grid spacing, to parameterize all cloud types in a large-scale model in a unified way.less

  5. Convective Radio Occultations Final Campaign Summary (Technical...

    Office of Scientific and Technical Information (OSTI)

    Convective Radio Occultations Final Campaign Summary Citation Details In-Document Search Title: Convective Radio Occultations Final Campaign Summary Deep convective systems are ...

  6. Secretary of Energy Ernest Moniz visits WIPP

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    12, 2014 Secretary of Energy Ernest Moniz visits WIPP This week, Energy Secretary Ernest Moniz visited Carlsbad to tour the site and see firsthand the recovery efforts underway at ...

  7. Visiting Jefferson Lab | Jefferson Lab

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Visiting Jefferson Lab Jefferson Lab is located in Newport News on the southeastern coast of Virginia in an area known as Hampton Roads. Situated between Norfolk and Williamsburg, Newport News is easily accessible by air, automobile and train. Jefferson Lab is one of 17 national laboratories funded by the U.S. Department of Energy. It is a user facility, meaning its unique research tools are available to scientists and college students from around the world. Currently, more than 1,500 users are

  8. Sandia National Laboratories: Visiting the LVOC

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Visiting the LVOC Are you a member of the research, business, or academic community who would like to learn more about current and future opportunities at the Livermore Valley Open Campus? We're actively seeking companies, research organizations, universities, and other laboratories with interests in energy, computing, homeland security, and other laboratory mission areas. Request a visit Contact us to explore collaborative opportunities and to discuss a potential visit to the LVOC. We look

  9. Microsoft Word - planning your visit .doc

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    we ask that you provide one chaperone for every 6 children. The chaperones should stay with their assigned group of students throughout the entire visit and model positive...

  10. Nuclear Energy Advisory Committee Facility Subcommittee visit...

    Broader source: Energy.gov (indexed) [DOE]

    Klein (Oregon State University). Tansel Selekler (Department of Energy Office of Nuclear Energy) accompanied the Subcommittee. The visit was well-coordinated by Sherrell...

  11. Visiting Us | Y-12 National Security Complex

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Us Visiting Us Considering a visit to Y-12? If so, here are a few things you will want to know before your visit. First and foremost, the Y-12 National Security Complex resides in an especially beautiful part of our state in a valley between the Great Smoky Mountains and the Cumberland Mountains. Y-12 is located in the City of Oak Ridge, just minutes away from downtown hotels, restaurants, and shopping. Before your visit, your Y-12 host or contact will make arrangements for you with Y-12 Visitor

  12. Congressional Delegation visits Naval Reactors Facility | National...

    National Nuclear Security Administration (NNSA)

    Chuck Fleischmann of the House Appropriations Subcommittee on Energy and Water Development, visited the Naval Reactors Facility (NRF) at the Idaho National Laboratory (INL). ...

  13. Visiting Faculty Program | Argonne National Laboratory

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    from a new angle, requires creative imagination and marks real advance in science." -Albert Einstein Overview The Visiting Faculty Program (VFP) offers research opportunities for...

  14. EM Leaders Visit Employees at Moab Site

    Broader source: Energy.gov [DOE]

    EM Principal Deputy Assistant Secretary Tracy Mustin and EM Consolidated Business Center Director Jack Craig visited the Moab Project sites in Utah on March 12.

  15. Foreign National Visit/Assignment Questionnaire

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Information (PII) Company Proprietary Information ... areas are to be visited) Property Protection Area with ... and Assignments 47 Is an Export Control License Required? ...

  16. UPDATE: Tropical Storm Isaac

    Office of Energy Efficiency and Renewable Energy (EERE)

    Information on customer power outages and other impacts on the energy sector as Tropical Storm Isaac develops.

  17. Classroom Visits | Princeton Plasma Physics Lab

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Classroom Visits PPPL scientists and engineers are available on a limited basis to talk to K-12 students about plasma physics, fusion energy, and related topics. These talks include many hands-on activities. **Now accepting requests for 2016!** Please use our Request Form if you would like us to visit your school.

  18. Experiment to Characterize Tropical Cloud Systems

    SciTech Connect (OSTI)

    May, Peter T.; Mather, Jim H.; Jakob, Christian

    2005-08-02

    A major experiment to study tropical convective cloud systems and their impacts will take place around Darwin, Northern Australia in early 2006. The Tropical Warm Pool International Cloud Experiment (TWP-ICE) is a collaboration including the DOE ARM (Atmospheric Radiation Measurement) and ARM-UAV programs, NASA centers, the Australian Bureau of Meteorology, CSIRO, and universities in the USA, Australia, Japan, the UK, and Canada. TWP-ICE will be preceded in November/December 2004 by a collaborating European aircraft campaign involving the EU SCOUT-O3 and UK NERC ACTIVE projects. Detailed atmospheric measurements will be made in the Darwin area through the whole Austral summer, giving unprecedented coverage through the pre-monsoon and monsoon periods.

  19. February 21, 2006: Bush visits NREL

    Broader source: Energy.gov [DOE]

    February 21, 2006President Bush, in a visit to DOE's National Renewable Energy Laboratory in Golden, Colorado, participates in an energy conservation and efficiency panel. The President states that...

  20. Head of EM Visits Northwest Tribes

    Broader source: Energy.gov [DOE]

    EM Acting Assistant Secretary Mark Whitney recently traveled to Idaho, Oregon, and Washington to visit the Confederated Tribes and Bands of the Yakama Nation, Wanapum Band, Confederated Tribes of the Umatilla Indian Reservation, and Nez Perce Tribe.

  1. The Tropical Warm Pool International Cloud Experiment

    SciTech Connect (OSTI)

    May, Peter T.; Mather, James H.; Vaughan, Geraint; Jakob, Christian; McFarquhar, Greg; Bower, Keith; Mace, Gerald G.

    2008-05-01

    One of the most complete data sets describing tropical convection ever collected will result from the upcoming Tropical Warm Pool International Cloud Experiment (TWP-ICE) in the area around Darwin, Northern Australia in January and February 2006. The aims of the experiment, which will be operated in conjunction with the DOE Atmospheric Radiation Measurement (ARM) site in Darwin, will be to examine convective cloud systems from their initial stages through to the decay of the cirrus generated and to measure their impact on the environment. The experiment will include an unprecedented network of ground-based observations (soundings, active and passive remote sensors) combined with low, mid and high altitude aircraft for in-situ and remote sensing measurements. A crucial outcome of the experiment will be a data set suitable to provide the forcing and evaluation data required by cloud resolving and single column models as well as global climate models (GCMs) with the aim to contribute to parameterization development. This data set will provide the necessary link between the observed cloud properties and the models that are attempting to simulate them. The experiment is a large multi-agency experiment including substantial contributions from the United States DOE ARM program, ARM-UAV program, NASA, the Australian Bureau of Meteorology, CSIRO, EU programs and many universities.

  2. LINE Commission Visits Idaho National Laboratory

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    LINE Commission Visits Idaho National Laboratory Members of the state of Idaho�s Leadership in Nuclear Energy (LINE) Commission recently visited the Idaho National Laboratory and related DOE-Idaho cleanup facilities. These photos show commission members at the Materials and Fuels Complex, where Steve Marschman from INL talks to the commission members, and the Advanced Mixed Waste Treatment Facility. At the AMWTP, members saw the supercompactor as Facility Manager Jeremy Hampton explained how

  3. Visiting Graduate Program | Argonne National Laboratory

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Visiting Graduate Program Perform your thesis research among the best and brightest at Argonne National Laboratory. About the Program Visiting Graduate Student Research Program appointments are available to Ph.D. candidates form foreign educational institutions who wish to carry out their thesis research at Argonne National Laboratory under co-sponsorship of an Argonne staff member and a faculty member. The university sets the academic standard and awards the degree. Appointees need to have a

  4. Sandia National Laboratories: Visiting Research Scholars

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Visiting Research Scholars Visting Research Scholars at Sandia Overview Since 1998 Sandia's Cooperative Monitoring Center has hosted a unique Visiting Research Scholar (VRS) Program that brings together international subject-matter experts to conduct joint research and analyses on policy and technology challenges related to global security concerns of the US government and its international partners. Often, the invited scholars represent opposing views with a goal of their research to include

  5. VFP - Visiting Faculty Program | The Ames Laboratory

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    VFP - Visiting Faculty Program Image Welcome to the Visiting Faculty Program (VFP) program, a premier Department of Energy summer internship designed to bring faculty and undergraduates into the laboratory research setting at the Ames Laboratory and Iowa State University to work with scientists who are leaders in their research fields. Faculty and students from across the country spend 10 weeks in the summer in our VFP program. Participating faculty receive a stipend of $1,300 per week. VFP

  6. Visiting PPPL | Princeton Plasma Physics Lab

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    PPPL Area Map Weather History Fusion Basics DOE and Fusion Links Speakers Bureau Tours 10 Facts About Fusion Energy Contract Documents News Events Research Education Organization Contact Us Overview Learn More Visiting PPPL PPPL Area Map Weather History Fusion Basics DOE and Fusion Links Speakers Bureau Tours 10 Facts About Fusion Energy Contract Documents Visiting PPPL Princeton Plasma Physics Laboratory P.O. Box 451 Princeton, NJ 08543-0451 GPS: 100 Stellarator Road Princeton, NJ 08540 U.S.A.

  7. Heat distribution by natural convection

    SciTech Connect (OSTI)

    Balcomb, J.D.

    1985-01-01

    Natural convection can provide adequate heat distribution in many situtations that arise in buildings. This is appropriate, for example, in passive solar buildings where some rooms tend to be more strongly solar heated than others or to reduce the number of heating units required in a building. Natural airflow and heat transport through doorways and other internal building apertures is predictable and can be accounted for in the design. The nature of natural convection is described, and a design chart is presented appropriate to a simple, single-doorway situation. Natural convective loops that can occur in buildings are described and a few design guidelines are presented.

  8. Heat distribution by natural convection

    SciTech Connect (OSTI)

    Balcomb, J.D.; Yamaguchi, K.

    1983-01-01

    Natural convection between spaces in a building can play a major role in energy transfer. Two situations are investigated: convection through a single doorway into a remote room, and a convective loop in a two-story house with a south sunspace where a north stairway serves as the return path. A doorway-sizing equation is given for the single-door case. Detailed data are given from the monitoring of airflow in one two-story house and summary data are given for five others. Observations on the nature of the airflow and design guidelines are presented.

  9. Energy Secretary to Visit Georgia Nuclear Reactor Site and Tennessee...

    Energy Savers [EERE]

    Chu will visit the Vogtle nuclear power plant in Waynesboro, Georgia, and Oak Ridge ... Secretary Chu traveled to Waynesboro, Georgia, to visit the Vogtle nuclear power plant, ...

  10. Site Visit Report, Hanford Waste Encapsulation Storage Facility...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Site Visit Report, Hanford Waste Encapsulation Storage Facility - January 2011 Site Visit Report, Hanford Waste Encapsulation Storage Facility - January 2011 January 2011 Hanford ...

  11. Remote Sensing Observations from MTI Satellites and GMS Over Tropical Island of Nauru

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Remote Sensing Laboratory Department of Energy's chief risk officer visits Nevada National Security Site Earlier this month, Associate Deputy Secretary John MacWilliams visited the Nevada National Security Site (NNSS) in his role as Chief Risk Officer for the Department of Energy. He reviewed the various ways the NNSS contributes to the department's and NNSA's missions, including radiological

    Remote Sensing Observations from MTI Satellites and GMS Over Tropical Island of Nauru W. M. Porch, P.

  12. Convective heat flow probe

    DOE Patents [OSTI]

    Dunn, J.C.; Hardee, H.C.; Striker, R.P.

    1984-01-09

    A convective heat flow probe device is provided which measures heat flow and fluid flow magnitude in the formation surrounding a borehole. The probe comprises an elongate housing adapted to be lowered down into the borehole; a plurality of heaters extending along the probe for heating the formation surrounding the borehole; a plurality of temperature sensors arranged around the periphery of the probe for measuring the temperature of the surrounding formation after heating thereof by the heater elements. The temperature sensors and heater elements are mounted in a plurality of separate heater pads which are supported by the housing and which are adapted to be radially expanded into firm engagement with the walls of the borehole. The heat supplied by the heater elements and the temperatures measured by the temperature sensors are monitored and used in providing the desired measurements. The outer peripheral surfaces of the heater pads are configured as segments of a cylinder and form a full cylinder when taken together. A plurality of temperature sensors are located on each pad so as to extend along the length and across the width thereof, with a heating element being located in each pad beneath the temperature sensors. An expansion mechanism driven by a clamping motor provides expansion and retraction of the heater pads and expandable packet-type seals are provided along the probe above and below the heater pads.

  13. Convective heat flow probe

    DOE Patents [OSTI]

    Dunn, James C.; Hardee, Harry C.; Striker, Richard P.

    1985-01-01

    A convective heat flow probe device is provided which measures heat flow and fluid flow magnitude in the formation surrounding a borehole. The probe comprises an elongate housing adapted to be lowered down into the borehole; a plurality of heaters extending along the probe for heating the formation surrounding the borehole; a plurality of temperature sensors arranged around the periphery of the probe for measuring the temperature of the surrounding formation after heating thereof by the heater elements. The temperature sensors and heater elements are mounted in a plurality of separate heater pads which are supported by the housing and which are adapted to be radially expanded into firm engagement with the walls of the borehole. The heat supplied by the heater elements and the temperatures measured by the temperature sensors are monitored and used in providing the desired measurements. The outer peripheral surfaces of the heater pads are configured as segments of a cylinder and form a full cylinder when taken together. A plurality of temperature sensors are located on each pad so as to extend along the length and across the width thereof, with a heating element being located in each pad beneath the temperature sensors. An expansion mechanism driven by a clamping motor provides expansion and retraction of the heater pads and expandable packer-type seals are provided along the probe above and below the heater pads.

  14. Heat distribution by natural convection

    SciTech Connect (OSTI)

    Balcomb, J.D.

    1985-01-01

    Natural convection can provide adequate heat distribution in many situations that arise in buildings. This is appropriate, for example, in passive solar buildings where some rooms tend to be more strongly solar heated than others. Natural convection can also be used to reduce the number of auxiliary heating units required in a building. Natural airflow and heat transport through doorways and other internal building apertures are predictable and can be accounted for in the design. The nature of natural convection is described, and a design chart is presented appropriate to a simple, single-doorway situation. Experimental results are summarized based on the monitoring of 15 passive solar buildings which employ a wide variety of geometrical configurations including natural convective loops.

  15. Shoshone-Bannock Tribes Officials Visit WIPP

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Shoshone-Bannock Tribes Officials Visiting Carlsbad for WIPP Training CARLSBAD, N.M., June 12, 2012- Photo caption: Two Shoshone-Bannock Tribes (SBT) officials are visiting the Department of Energy (DOE) Carlsbad Field Office (CBFO) and Waste Isolation Pilot Plant (WIPP) near Carlsbad, New Mexico, June 12-13, 2012, for emergency response training provided by WIPP. They were greeted on arrival at the CBFO, which has a cooperative agreement with the SBT, in-town offices and paused for a photo.

  16. Unclassified Foreign National Visits & Assignments Questionnaire

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Unclassified Foreign National Visits & Assignments Questionnaire |Welcome to U.S. Department of Energy Office of Legacy Management! We are looking forward to your visit or assignment with us. In order to comply with our security requirements and ensure that your time with the Department of Energy goes smoothly we need to obtain some information from you prior to your arrival. Please take a few minutes to provide the information requested below for each member of your party that is not a U.S.

  17. SLA%20Visit.jpg | OSTI, US Dept of Energy Office of Scientific and

    Office of Scientific and Technical Information (OSTI)

    Technical Information SLA%20Visit

  18. Differences between nonprecipitating tropical and trade wind marine shallow cumuli

    SciTech Connect (OSTI)

    Ghate, Virendra P.; Miller, Mark A.; Zhu, Ping

    2015-11-13

    In this study, marine nonprecipitating cumulus topped boundary layers (CTBLs) observed in a tropical and in a trade wind region are contrasted based on their cloud macrophysical, dynamical, and radiative structures. Data from the Atmospheric Radiation Measurement (ARM) observational site previously operating at Manus Island, Papua New Guinea, and data collected during the deployment of ARM Mobile Facility at the island of Graciosa, in the Azores, were used in this study. The tropical marine CTBLs were deeper, had higher surface fluxes and boundary layer radiative cooling, but lower wind speeds compared to their trade wind counterparts. The radiative velocity scale was 50%-70% of the surface convective velocity scale at both locations, highlighting the prominent role played by radiation in maintaining turbulence in marine CTBLs. Despite greater thicknesses, the chord lengths of tropical cumuli were on average lower than those of trade wind cumuli, and as a result of lower cloud cover, the hourly averaged (cloudy and clear) liquid water paths of tropical cumuli were lower than the trade wind cumuli. At both locations ~70% of the cloudy profiles were updrafts, while the average amount of updrafts near cloud base stronger than 1 m s–1 was ~22% in tropical cumuli and ~12% in the trade wind cumuli. The mean in-cloud radar reflectivity within updrafts and mean updraft velocity was higher in tropical cumuli than the trade wind cumuli. Despite stronger vertical velocities and a higher number of strong updrafts, due to lower cloud fraction, the updraft mass flux was lower in the tropical cumuli compared to the trade wind cumuli. The observations suggest that the tropical and trade wind marine cumulus clouds differ significantly in their macrophysical and dynamical structures

  19. Differences between nonprecipitating tropical and trade wind marine shallow cumuli

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Ghate, Virendra P.; Miller, Mark A.; Zhu, Ping

    2015-11-13

    In this study, marine nonprecipitating cumulus topped boundary layers (CTBLs) observed in a tropical and in a trade wind region are contrasted based on their cloud macrophysical, dynamical, and radiative structures. Data from the Atmospheric Radiation Measurement (ARM) observational site previously operating at Manus Island, Papua New Guinea, and data collected during the deployment of ARM Mobile Facility at the island of Graciosa, in the Azores, were used in this study. The tropical marine CTBLs were deeper, had higher surface fluxes and boundary layer radiative cooling, but lower wind speeds compared to their trade wind counterparts. The radiative velocity scalemore » was 50%-70% of the surface convective velocity scale at both locations, highlighting the prominent role played by radiation in maintaining turbulence in marine CTBLs. Despite greater thicknesses, the chord lengths of tropical cumuli were on average lower than those of trade wind cumuli, and as a result of lower cloud cover, the hourly averaged (cloudy and clear) liquid water paths of tropical cumuli were lower than the trade wind cumuli. At both locations ~70% of the cloudy profiles were updrafts, while the average amount of updrafts near cloud base stronger than 1 m s–1 was ~22% in tropical cumuli and ~12% in the trade wind cumuli. The mean in-cloud radar reflectivity within updrafts and mean updraft velocity was higher in tropical cumuli than the trade wind cumuli. Despite stronger vertical velocities and a higher number of strong updrafts, due to lower cloud fraction, the updraft mass flux was lower in the tropical cumuli compared to the trade wind cumuli. The observations suggest that the tropical and trade wind marine cumulus clouds differ significantly in their macrophysical and dynamical structures« less

  20. Applications Now Open: Learn About the Visiting Faculty Program |

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Department of Energy Applications Now Open: Learn About the Visiting Faculty Program Applications Now Open: Learn About the Visiting Faculty Program December 4, 2012 - 2:00pm Addthis Applications are now open for the Office of Science's Visiting Faculty Program. Applications are now open for the Office of Science's Visiting Faculty Program. Applications are being accepted now through January 10, 2013, for the Visiting Faculty Program, which hosts university and college faculty members at

  1. ARM - Midlatitude Continental Convective Clouds

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Jensen, Mike; Bartholomew, Mary Jane; Genio, Anthony Del; Giangrande, Scott; Kollias, Pavlos

    Convective processes play a critical role in the Earth's energy balance through the redistribution of heat and moisture in the atmosphere and their link to the hydrological cycle. Accurate representation of convective processes in numerical models is vital towards improving current and future simulations of Earths climate system. Despite improvements in computing power, current operational weather and global climate models are unable to resolve the natural temporal and spatial scales important to convective processes and therefore must turn to parameterization schemes to represent these processes. In turn, parameterization schemes in cloud-resolving models need to be evaluated for their generality and application to a variety of atmospheric conditions. Data from field campaigns with appropriate forcing descriptors have been traditionally used by modelers for evaluating and improving parameterization schemes.

  2. ARM - Midlatitude Continental Convective Clouds

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Jensen, Mike; Bartholomew, Mary Jane; Genio, Anthony Del; Giangrande, Scott; Kollias, Pavlos

    2012-01-19

    Convective processes play a critical role in the Earth's energy balance through the redistribution of heat and moisture in the atmosphere and their link to the hydrological cycle. Accurate representation of convective processes in numerical models is vital towards improving current and future simulations of Earths climate system. Despite improvements in computing power, current operational weather and global climate models are unable to resolve the natural temporal and spatial scales important to convective processes and therefore must turn to parameterization schemes to represent these processes. In turn, parameterization schemes in cloud-resolving models need to be evaluated for their generality and application to a variety of atmospheric conditions. Data from field campaigns with appropriate forcing descriptors have been traditionally used by modelers for evaluating and improving parameterization schemes.

  3. Boreal winter MJO teleconnection in the Community Atmosphere Model version 5 with the Unified Convection parameterization

    SciTech Connect (OSTI)

    Yoo, Changhyun; Park, Sungsu; Kim, Daehyun; Yoon, Jin-Ho; Kim, Hye-Mi

    2015-10-15

    The Madden-Julian Oscillation (MJO), the dominant mode of tropical intraseasonal variability, influences weather and climate in the extratropics through atmospheric teleconnection. In this study, two simulations using the Community Atmosphere Model version 5 (CAM5) - one with the default shallow and deep convection schemes and the other with the Unified Convection scheme (UNICON) - are employed to examine the impacts of cumulus parameterizations on the simulation of the boreal wintertime MJO teleconnection in the Northern Hemisphere. We demonstrate that the UNICON substantially improves the MJO teleconnection. When the UNICON is employed, the simulated circulation anomalies associated with the MJO better resemble the observed counterpart, compared to the simulation with the default convection schemes. Quantitatively, the pattern correlation for the 300-hPa geopotential height anomalies between the simulations and observation increases from 0.07 for the default schemes to 0.54 for the UNICON. These circulation anomalies associated with the MJO further help to enhance the surface air temperature and precipitation anomalies over North America, although room for improvement is still evident. Initial value calculations suggest that the realistic MJO teleconnection with the UNICON is not attributed to the changes in the background wind, but primarily to the improved tropical convective heating associated with the MJO.

  4. Unclassified Foreign Visits and Assignments Program

    Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

    2004-06-18

    The order defines a program for unclassified foreign national access to Department of Energy sites, information, and technologies. The page change streamlines the HQs Management Panel review process to include reviews by HSS, IN, and a representative of the cognizant under secretary for access requests involving foreign nationals. Cancels Secretarial Memorandum, Unclassified Foreign Visits and Assignments, dated 7-14-99; Memorandum from Francis S. Blake, Departmental Use of Foreign Access Central Tracking System, dated 11-05-01; Memorandum from Kyle E. McSlarrow, Interim Guidance for Implementation of the Department's Unclassified Foreign Visits and Assignments Program, dated 12-17-02; and Secretarial Memorandum, Policy Exclusion for Unclassified Foreign National's Access to Department of Energy Facilities in Urgent or Emergency Medical Situations, dated 4-10-01. Cancels: DOE P 142.1 and DOE N 142.1

  5. Energy Council Executive Committee Visits Sandia

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Council Executive Committee Visits Sandia - Sandia Energy Energy Search Icon Sandia Home Locations Contact Us Employee Locator Energy & Climate Secure & Sustainable Energy Future Stationary Power Energy Conversion Efficiency Solar Energy Wind Energy Water Power Supercritical CO2 Geothermal Natural Gas Safety, Security & Resilience of the Energy Infrastructure Energy Storage Nuclear Power & Engineering Grid Modernization Battery Testing Nuclear Energy Defense Waste Management

  6. Visit of the Federal President of Germany

    ScienceCinema (OSTI)

    None

    2011-04-25

    Le D.G. H.Schopper a le plaisir de souhaiter la bienvenue au président de la République fédérale allemande, Richard von Weizsäcker (président féderale de 1984-1994). C'est la première visite d'un président allemand dans l'histoire du Cern.

  7. Scientific Visit on Crystalline Rock Repository Development

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Visit on Crystalline Rock Repository Development - Sandia Energy Energy Search Icon Sandia Home Locations Contact Us Employee Locator Energy & Climate Secure & Sustainable Energy Future Stationary Power Energy Conversion Efficiency Solar Energy Wind Energy Water Power Supercritical CO2 Geothermal Natural Gas Safety, Security & Resilience of the Energy Infrastructure Energy Storage Nuclear Power & Engineering Grid Modernization Battery Testing Nuclear Energy Defense Waste

  8. Australian Renewable-Energy Official Visits Sandia

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Australian Renewable-Energy Official Visits Sandia - Sandia Energy Energy Search Icon Sandia Home Locations Contact Us Employee Locator Energy & Climate Secure & Sustainable Energy Future Stationary Power Energy Conversion Efficiency Solar Energy Wind Energy Water Power Supercritical CO2 Geothermal Natural Gas Safety, Security & Resilience of the Energy Infrastructure Energy Storage Nuclear Power & Engineering Grid Modernization Battery Testing Nuclear Energy Defense Waste

  9. Unclassified Foreign National Visits and Assignments

    Broader source: Energy.gov [DOE]

    Attached for your information is a March 9,201 0 Memorandum from the Deputy Secretary relaxing certain check and approval requirements relating to visits and assignments of foreign nationals to DOE facilities and National Laboratories, including National Nuclear Security Administration sites. This is part of an ongoing review of DOE Order 142.3. Please furnish a copy to affected contractors pending revision of the Order and its associated Contractor Requirements Document.

  10. NATURAL CONVECTION IN ROOM GEOMETRIES

    SciTech Connect (OSTI)

    Gadgil, A.; Bauman, Fred; Kammerud, R.; Ruberg, K.

    1980-06-01

    Computer programs have been developed to numerically simulate natural convection in room geometries in two and three dimensions. The programs have been validated using published data from the literature, results from a full-scale experiment performed at Massachusetts Institute of Technology, and results from a small-scale experiment reported here. One of the computer programs has been used to study the influence of natural convection on the thermal performance of a single thermal zone in a direct-gain passive solar building. The results indicate that the building heating loads calculated by standard building energy analysis methods may be in error by as much as 50% as a result of their use of common assumptions regarding the convection processes which occur in an enclosure. It is also found that the convective heat transfer coefficients between the air and the enclosure surfaces can be substantially different from the values assumed in the standard building energy analysis methods, and can exhibit significant variations across a given surface.

  11. Improving Convective Parameterization Using ARM Data

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Improving Convective Parameterization Using ARM Data G. J. Zhang Center for Atmospheric Sciences Scripps Institution of Oceanography La Jolla, California Introduction Convective parameterization is one of the most challenging issues in global climate models (GCMs). Convection, as represented by convective parameterization schemes in GCMs, is controlled by the large- scale dynamic and thermodynamic fields through a closure condition. Such a closure condition is typically determined empirically by

  12. Leadership Oak Ridge visits Y-12 | National Nuclear Security...

    National Nuclear Security Administration (NNSA)

    Leadership Oak Ridge visits Y-12 NNSA Blog The 2015 Leadership Oak Ridge class recently ... The 2015 Leadership Oak Ridge class recently visited the Y-12 National Security Complex. ...

  13. David Willets Visits JCESR - Joint Center for Energy Storage Research

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    19, 2014, Videos David Willets Visits JCESR willets-audio UK Universities and Science Minister, David Willetts, visited Argonne National Laboratory and the Joint Center for Energy Storage Research (JCESR).

  14. Pete Lyons visits Sandia | National Nuclear Security Administration

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Sheets Newsletters Press Releases Video Gallery Photo Gallery Jobs Apply for Our Jobs Our Jobs Working at NNSA Blog Home NNSA Blog Pete Lyons visits Sandia Pete Lyons visits...

  15. Senior DOE Officials Visit Paducah Gaseous Diffusion Plant Site...

    Energy Savers [EERE]

    Senior DOE Officials Visit Paducah Gaseous Diffusion Plant Site Senior DOE Officials Visit Paducah Gaseous Diffusion Plant Site April 29, 2015 - 12:00pm Addthis EM Paducah site ...

  16. August 1, 2005: Bodman visits Oak Ridge | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    2005: Bodman visits Oak Ridge August 1, 2005: Bodman visits Oak Ridge August 1, 2005: Bodman visits Oak Ridge August 1, 2005 Secretary Bodman visits (pdf) DOE's Oak Ridge National Laboratory to tour the facility and host an all-hands meeting with lab employees. The Secretary tells the employees that he is pleased and enthusiastic, on the whole, with the Energy Policy Act, particularly in that it has measures to encourage more nuclear energy generation. When asked what methods of generation he

  17. Foreign Visits & Assignments Guidelines | The Ames Laboratory

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Foreign Visits & Assignments Guidelines Foreign Visits and Assignments Requests (473's) and Specific Security Plans Please use the following links to reach Form 473, the Foreign Visits and Assignments Request Form, as well as the Ames Laboratory Specific Security Plan Form. Form 473 Foreign Visits and Assignments Request Form Specific Security Plan Program Overview. The USDOE considers hosting foreign visitors a critical responsibility. This is especially true when the foreign national is

  18. Secretary Steven Chu Visits Princeton Plasma Physics Laboratory |

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Department of Energy Visits Princeton Plasma Physics Laboratory Secretary Steven Chu Visits Princeton Plasma Physics Laboratory September 28, 2010 - 10:34am Addthis Secretary Steven Chu Visits Princeton Plasma Physics Laboratory Elizabeth Meckes Elizabeth Meckes Director of User Experience & Digital Technologies, Office of Public Affairs Yesterday, Secretary Chu had the opportunity to visit the Department's Princeton Plasma Physics Laboratory (PPPL) in New Jersey - a facility he said has

  19. Seminar/Site Visit Attendance & Credit Form | Photosynthetic Antenna

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Research Center Seminar/Site Visit Attendance & Credit Form Seminar/Site Visit Attendance & Credit Form Please note that seminars/site visits attended more than 3 semesters prior to the submission of the Certificate Program Application will not be counted toward the certificate. Please note that other forms are available HERE. Student Name * Student ID * Current Standing * Freshman Sophomore Junior Senior Seminar Title/Site Visit Name * Date of Event * Month Month Jan Feb Mar Apr May

  20. Site Visit Report, Lawrence Livermore National Laboratory - February...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Lawrence Livermore National Laboratory - February 2011 Site Visit Report, Lawrence Livermore National Laboratory - February 2011 February 2011 Lawrence Livermore National ...

  1. Assessment C-Site Visit Protocol | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    C-Site Visit Protocol Assessment C-Site Visit Protocol Assessment C- Site Visit Protocol.pdf (201.4 KB) More Documents & Publications Assessment B - Program Criteria ATTACHMENT A - CHECKLIST FOR SELF ASSESSMENT CX-000791: Categorical Exclusion Determination

  2. Fermilab | Visit Fermilab | Hours, Maps and Directions

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Hours and site access Check the Fermilab home page for our latest news and a calendar of events, which also includes days that our main building and exhibits are closed. Hours Fermilab's site is open to the public every day of the week from 8 a.m. to 6 p.m. from November to March and from 8 a.m. to 8 p.m. the rest of the year. A map of Fermilab's public areas is available online. Fermilab visitors are allowed to visit two buildings on their own: Wilson Hall and the Leon Lederman Science

  3. Fermilab | Visit Fermilab | Tours, Programs and Events

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Tours, programs and events Tours Fermilab’s site is open every day from 8 a.m. to 8 p.m. in the summer months and 8 a.m. to 6 p.m. the rest of the year. Public tours and tours by appointment are available. Public tours are offered every Wednesday at 10:30 a.m., as part of the Ask-a-Scientist event on the first Sunday of each month, and on third Sundays during the summer. The Lederman Science Center is open to the public and offers hands-on science exhibits for students. Visit the Lederman

  4. Campus and Conference Visits | Y-12 National Security Complex

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Campus and Conference Visits We usually visit college campuses twice a year, once in the fall and again in the spring. Our fall visits typically occur from September to December; spring visits occur from January to March. To find out when we will be visiting your school, check with the career placement center on your campus or check out the schedule below. We also participate in national conferences each year. If you are a member of the American Indian Science and Engineering Society, Society of

  5. An observational study of entrainment rate in deep convection

    SciTech Connect (OSTI)

    Guo, Xiaohao; Lu, Chunsong; Zhao, Tianliang; Zhang, Guang Jun; Liu, Yangang

    2015-09-22

    This study estimates entrainment rate and investigates its relationships with cloud properties in 156 deep convective clouds based on in-situ aircraft observations during the TOGA-COARE (Tropical Ocean Global Atmosphere Coupled Ocean Atmosphere Response Experiment) field campaign over the western Pacific. To the authors’ knowledge, this is the first study on the probability density function of entrainment rate, the relationships between entrainment rate and cloud microphysics, and the effects of dry air sources on the calculated entrainment rate in deep convection from an observational perspective. Results show that the probability density function of entrainment rate can be well fitted by lognormal, gamma or Weibull distribution, with coefficients of determination being 0.82, 0.85 and 0.80, respectively. Entrainment tends to reduce temperature, water vapor content and moist static energy in cloud due to evaporative cooling and dilution. Inspection of the relationships between entrainment rate and microphysical properties reveals a negative correlation between volume-mean radius and entrainment rate, suggesting the potential dominance of homogeneous mechanism in the clouds examined. The entrainment rate and environmental water vapor content show similar tendencies of variation with the distance of the assumed environmental air to the cloud edges. Their variation tendencies are non-monotonic due to the relatively short distance between adjacent clouds.

  6. An observational study of entrainment rate in deep convection

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Guo, Xiaohao; Lu, Chunsong; Zhao, Tianliang; Zhang, Guang Jun; Liu, Yangang

    2015-09-22

    This study estimates entrainment rate and investigates its relationships with cloud properties in 156 deep convective clouds based on in-situ aircraft observations during the TOGA-COARE (Tropical Ocean Global Atmosphere Coupled Ocean Atmosphere Response Experiment) field campaign over the western Pacific. To the authors’ knowledge, this is the first study on the probability density function of entrainment rate, the relationships between entrainment rate and cloud microphysics, and the effects of dry air sources on the calculated entrainment rate in deep convection from an observational perspective. Results show that the probability density function of entrainment rate can be well fitted by lognormal,more » gamma or Weibull distribution, with coefficients of determination being 0.82, 0.85 and 0.80, respectively. Entrainment tends to reduce temperature, water vapor content and moist static energy in cloud due to evaporative cooling and dilution. Inspection of the relationships between entrainment rate and microphysical properties reveals a negative correlation between volume-mean radius and entrainment rate, suggesting the potential dominance of homogeneous mechanism in the clouds examined. The entrainment rate and environmental water vapor content show similar tendencies of variation with the distance of the assumed environmental air to the cloud edges. Their variation tendencies are non-monotonic due to the relatively short distance between adjacent clouds.« less

  7. Tropical Warm Pool International Cloud Experiment (TWP-ICE): Cloud and Rain Characteristics in the Australian Monsoon

    SciTech Connect (OSTI)

    PT May; C Jakob; JH Mather

    2004-05-30

    The impact of oceanic convection on its environment and the relationship between the characteristics of the convection and the resulting cirrus characteristics is still not understood. An intense airborne measurement campaign combined with an extensive network of ground-based observations is being planned for the region near Darwin, Northern Australia, during January-February, 2006, to address these questions. The Tropical Warm Pool – International Cloud Experiment (TWP-ICE) will be the first field program in the tropics that attempts to describe the evolution of tropical convection, including the large scale heat, moisture, and momentum budgets, while at the same time obtaining detailed observations of cloud properties and the impact of the clouds on the environment. The emphasis will be on cirrus for the cloud properties component of the experiment. Cirrus clouds are ubiquitous in the tropics and have a large impact on their environment but the properties of these clouds are poorly understood. A crucial product from this experiment will be a dataset suitable to provide the forcing and testing required by cloud-resolving models and parameterizations in global climate models. This dataset will provide the necessary link between cloud properties and the models that are attempting to simulate them. The experiment is a collaboration between the U.S. Department of Energy (DOE) Atmospheric Radiation Measurement (ARM) Program, the Bureau of Meteorology (BoM), the National Aeronautics and Space Administration (NASA), the European Commission DG RTD-1.2, and several United States, Australian, Canadian, and European Universities. This experiment will be undertaken over a 4-week period in early 2006. January and February corresponds to the wet phase of the Australia monsoon. This season has been selected because, despite Darwin’s coastal location, the convection that occurs over and near Darwin at this time is largely of maritime origin with a large fetch over water

  8. Cirrus cloud-temperature interactions over a tropical station, Gadanki from lidar and satellite observations

    SciTech Connect (OSTI)

    S, Motty G Satyanarayana, M. Krishnakumar, V. Dhaman, Reji k.

    2014-10-15

    The cirrus clouds play an important role in the radiation budget of the earth's atmospheric system and are important to characterize their vertical structure and optical properties. LIDAR measurements are obtained from the tropical station Gadanki (13.5{sup 0} N, 79.2{sup 0} E), India, and meteorological indicators derived from Radiosonde data. Most of the cirrus clouds are observed near to the tropopause, which substantiates the strength of the tropical convective processes. The height and temperature dependencies of cloud height, optical depth, and depolarization ratio were investigated. Cirrus observations made using CALIPSO satellite are compared with lidar data for systematic statistical study of cirrus climatology.

  9. Stratiform and Convective Precipitation Observed by Multiple...

    Office of Scientific and Technical Information (OSTI)

    The composite distributions of KAZR reflectivity and Doppler velocity also show two distinct structures for convective and stratiform rain. These indicate that the method produces ...

  10. ARM - Evaluation Product - Convective Vertical Velocity

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    In particular, vertical air motions associated with these processes are inherently linked to the life cycle of these convective systems and are therefore directly tied to their...

  11. ARM - Midlatitude Continental Convective Clouds - Single Column...

    Office of Scientific and Technical Information (OSTI)

    - Single Column Model Forcing (xie-scmforcing) Title: ARM - Midlatitude Continental Convective Clouds - Single Column Model Forcing (xie-scmforcing) The constrained variational ...

  12. Large-scale Environmental Variables and Transition to Deep Convection in Cloud Resolving Model Simulations: A Vector Representation

    SciTech Connect (OSTI)

    Hagos, Samson M.; Leung, Lai-Yung R.

    2012-11-01

    Cloud resolving model simulations and vector analysis are used to develop a quantitative method of assessing regional variations in the relationships between various large-scale environmental variables and the transition to deep convection. Results of the CRM simulations from three tropical regions are used to cluster environmental conditions under which transition to deep convection does and does not take place. Projections of the large-scale environmental variables on the difference between these two clusters are used to quantify the roles of these variables in the transition to deep convection. While the transition to deep convection is most sensitive to moisture and vertical velocity perturbations, the details of the profiles of the anomalies vary from region to region. In comparison, the transition to deep convection is found to be much less sensitive to temperature anomalies over all three regions. The vector formulation presented in this study represents a simple general framework for quantifying various aspects of how the transition to deep convection is sensitive to environmental conditions.

  13. Defense Secretary Chuck Hagel visits Sandia | National Nuclear Security

    National Nuclear Security Administration (NNSA)

    Administration | (NNSA) Defense Secretary Chuck Hagel visits Sandia Thursday, January 9, 2014 - 3:21pm Defense Secretary Chuck Hagel visited the Z Pulsed Power Facility at Sandia National Laboratories in Albuquerque, N.M., yesterday. The tour was part of a broader visit to the national laboratory and Kirtland Air Force Base. While at Sandia, Secretary Hagel was provided with briefings and tours of several of the unique capabilities at the laboratory used to assist the Department of Defense

  14. Microsoft Word - Assessment-C-SiteVisitProtocol

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    ATTACHMENT C DEPARTMENTAL EVALUATION AND SITE VISIT PROTOCOL 1. The Departmental Records Officer will provide in writing to the PRO a sixty day notice of intent to evaluate, along with recommended sites to be visited and areas to be examined. 2. The PRO will notify sites to be visited and coordinate mutually agreeable dates with the Departmental Records Officer. 3. The PRO will provide an overview of the organization's Records Management Program and make summaries of assessments available for

  15. Secretary Bodman Begins Australia Visit | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Begins Australia Visit Secretary Bodman Begins Australia Visit January 11, 2006 - 10:24am Addthis Two day trip highlighted by Asia-Pacific Partnership inaugural meeting SYDNEY, AUSTRALIA - Secretary of Energy Samuel W. Bodman on Wednesday began a two day visit to Australia where he will lead the United States delegation to the inaugural meeting of the Asia-Pacific Partnership for Clean Development and Climate (APP). The APP brings together governments and private sector entities from Australia,

  16. Secretary Bodman Visits National Energy Technology Lab | Department of

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Energy National Energy Technology Lab Secretary Bodman Visits National Energy Technology Lab January 6, 2006 - 9:11am Addthis On Friday, January 6, Secretary Bodman visited the National Energy Technology Lab (NETL) in Pittsburgh, PA, to tour the research facility and hold an all-hands meeting with NETL employees. The Secretary was joined by Assistant Secretary for Fossil Energy Jeff Jarrett and Congressman Tim Murphy (R-PA). During the visit, Secretary Bodman toured exhibits on NETL's

  17. Secretary Chu to Visit Pantex Plant Tomorrow | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    to Visit Pantex Plant Tomorrow Secretary Chu to Visit Pantex Plant Tomorrow August 10, 2010 - 12:00am Addthis WASHINGTON, DC - U.S. Secretary of Energy Steven Chu will visit the Pantex Plant tomorrow, Wednesday, August 11. The Pantex Plant is part of the Department of Energy's National Nuclear Security Administration. In addition to touring the plant, Secretary Chu will participate in briefings with technical experts and participate in an all hands meeting with plant employees. Secretary Chu

  18. Nuclear Energy Advisory Committee, Facility Subcommittee visit to Idaho

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    National Laboratory | Department of Energy Advisory Committee, Facility Subcommittee visit to Idaho National Laboratory Nuclear Energy Advisory Committee, Facility Subcommittee visit to Idaho National Laboratory The Nuclear Energy Advisory Committee, Facility Subcommittee visited the Idaho National Laboratory on 19-20 May 2010 to tour the nuclear infrastructure and to discuss the INL plans for facility modernization as a dimension of the DOE Office of Nuclear Energy's (NE) mission. This was

  19. President Obama visits Geothermal Technologies Program Partner | Department

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    of Energy visits Geothermal Technologies Program Partner President Obama visits Geothermal Technologies Program Partner May 2, 2011 - 1:41pm Addthis President Obama visited ElectraTherm, a renewable energy company, at its Reno, Nevada headquarters on Thursday, April 21 for his third "Shared Responsibility and Shared Prosperity" town hall. The company's patented "Green Machine" generates emission-free power from low- to mid-temperature waste heat. This modular system with

  20. Collegiate Wind Competition Winner Penn State Visits Energy Department |

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Department of Energy Collegiate Wind Competition Winner Penn State Visits Energy Department Collegiate Wind Competition Winner Penn State Visits Energy Department Addthis Description Below is the text version for the "Collegiate Wind Competition Winner Penn State Visits Energy Department" video. Patrick Nicodemus: Team Winergize I'm here representing Penn State, the winner of this year's competition for two years running. We bring it to the competition to test it in a wind tunnel

  1. Vice President Biden Visits National Renewable Energy Laboratory, Announces

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    First Agreement Under "America's Next Top Energy Innovator" Challenge | Department of Energy Vice President Biden Visits National Renewable Energy Laboratory, Announces First Agreement Under "America's Next Top Energy Innovator" Challenge Vice President Biden Visits National Renewable Energy Laboratory, Announces First Agreement Under "America's Next Top Energy Innovator" Challenge May 20, 2011 - 12:00am Addthis Washington, DC - Today, while visiting the

  2. U.S. Energy Secretary Visits Qatar | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Qatar U.S. Energy Secretary Visits Qatar November 15, 2005 - 2:42pm Addthis Includes tour of Ras Laffan Industrial City and Port, opening of GE corporate office building, a visit to Education City, and time spent thanking U.S. troops DOHA, QATAR - U.S. Secretary of Energy Samuel W. Bodman today concluded a two-day visit to Qatar by participating in the announcement of Ras Laffan Liquefied Natural Gas Company III (RasGas III), visiting Qatar's Education City, and eating lunch with U.S. troops

  3. Visiting Speaker Program - October 28, 2009 | Department of Energy

    Energy Savers [EERE]

    Visiting Speaker Program - October 28, 2009 October 28, 2009 Lecture Fraud and Theft in the Information Age by Frank W. Abagnale Jr. Author, Lecturer, Consultant Mr. Abagnale is ...

  4. VisIt on Tukey | Argonne Leadership Computing Facility

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Cooley Policies Documentation Feedback Please provide feedback to help guide us as we continue to build documentation for our new computing resource. [Feedback Form] VisIt on Tukey Getting Started On your local machine: Download (https://wci.llnl.gov/codes/visit/download.html) and install VisIt (The most recent version installed on Tukey is 2.7.3. Versions 2.7.1 and 2.6.2 is also available.) Download the Tukey host profile for VisIt (you may need to right-click and choose "Save link

  5. Paducah Site Hosts Governor’s Scholars Visit

    Broader source: Energy.gov [DOE]

    PADUCAH, Ky. – Nineteen of Kentucky’s brightest teenagers visited the Paducah site this summer to learn more about environmental cleanup and waste management.

  6. Sandia National Laboratories: Visiting the Livermore Valley Open...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Visiting the LVOC LVOC Home Partnership Opportunities Featured Programs Working at the LVOC Are you a member of the research, business, or academic community who would like to...

  7. Madelyn Creedon visits NNSS U1a underground complex | National...

    National Nuclear Security Administration (NNSA)

    Friday, February 13, 2015 - 9:34am NNSA Blog This week, NNSA Principal Deputy Administrator Madelyn Creedon visited the Nevada National Security Site (NNSS). She discussed ...

  8. Vice President Biden Visits National Renewable Energy Laboratory...

    Energy Savers [EERE]

    National Renewable Energy Laboratory, Announces First Agreement Under "America's Next Top Energy Innovator" Challenge Vice President Biden Visits National Renewable Energy ...

  9. Madelyn Creedon visits Savannah River Site | National Nuclear...

    National Nuclear Security Administration (NNSA)

    She visited the nation's only center for extracting, recycling and processing tritium, an isotope of hydrogen that is a vital component to the nation's nuclear defense. She also ...

  10. Swedish Delegation Visits DOE's National Renewable Energy Lab...

    Energy Savers [EERE]

    Prime Minister Reinfeldt toured research facilities and viewed demonstrations on solar energy, biofuels, wind power, and hybrid vehicles. Today's visit concludes the Prime ...

  11. Energy Secretary Moniz Visits Clean Coal Facility in Mississippi...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Mississippi Energy Secretary Moniz Visits Clean Coal Facility in Mississippi November 8, 2013 - 3:36pm Addthis On Friday, Nov. 8, 2013, Secretary Moniz and international energy ...

  12. Secretary Moniz Joins President Obama in Visit to Cleveland High...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Joins President Obama in Visit to Cleveland High-Strength Steel Factory Secretary Moniz ... Rob Roberts Rob Roberts Former Director of Digital Strategy Yesterday, Secretary Moniz ...

  13. Ars Technica Visits GE's China Technology Center | GE Global Research

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Technica visits GE's China Technology Center Click to email this to a friend (Opens in new window) Share on Facebook (Opens in new window) Click to share (Opens in new window) Click to share on LinkedIn (Opens in new window) Click to share on Tumblr (Opens in new window) Ars Technica visits GE's China Technology Center Ars Technica visited GE's China Technology Center in Shanghai to discover what type of research is being conducted at the facility. The visit was a part of Ars Technica's Chasing

  14. Deputy Secretary Sherwood-Randall Visits Waste Isolation Pilot...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Isolation Pilot Plant to Survey Recovery Progress, Support Stakeholders and Employees Deputy Secretary Sherwood-Randall Visits Waste Isolation Pilot Plant to Survey Recovery ...

  15. Weapons Intern Program participants visit Pantex | National Nuclear...

    National Nuclear Security Administration (NNSA)

    NNSA Blog The current Sandia Weapons Intern Program (WIP) class recently visited NNSA's Pantex Plant as part of the six-month program curriculum. While at Pantex, participants ...

  16. Site Visit Report, Livermore Site Office - February 2011 | Department...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Livermore Site Office - February 2011 Site Visit Report, Livermore Site Office - February 2011 February 2011 Livermore Site Office Safety Basis Self-Assessment esults of the Office ...

  17. Transient Response of a Natural Convection System

    SciTech Connect (OSTI)

    Mohammad, B. S.; Usman, S.; Shoaib, L.; Abdallah, S.

    2006-07-01

    Transient response of a natural convection system is investigated by numerical simulation using FLUENT code. An Integrator Circuit analogy was recently proposed for natural convection system. The proposed analogy was further confirmed by these recent simulations. New simulation results also suggest that a natural convection system acts as a 'Low Pass' filter for transients. Transmission/attenuation characteristics of natural convection system were investigated using a sinusoidal temperature at the source side boundary. Transient transmission/ attenuation factor was found to be a function of both fluid properties and the flow characteristics. Transmission/attenuation factor was also found to be a strong function of fluctuation frequency. These results may prove a significant design tool for Gen IV natural convection system particularly for LFR. (authors)

  18. A dual mass flux framework for boundary layer convection

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    A dual mass flux framework for boundary layer convection Neggers, Roel European Centre for Medium-range Weather Forecasts (ECMWF) Category: Modeling A new convective boundary layer...

  19. Convectively driven PCR thermal-cycling (Patent) | DOEPatents

    Office of Scientific and Technical Information (OSTI)

    Convectively driven PCR thermal-cycling Title: Convectively driven PCR thermal-cycling A polymerase chain reaction system provides an upper temperature zone and a lower temperature ...

  20. ARM - Field Campaign - ARM Support for the Plains Elevated Convection...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    govCampaignsARM Support for the Plains Elevated Convection at Night Experiment: Doppler Lidar Operations Related Campaigns ARM Support for the Plains Elevated Convection at Night...

  1. First Secretarial Visit to the Big Hill SPR Site

    Broader source: Energy.gov [DOE]

    Secretary of Energy Ernest Moniz visited the Office of Fossil Energy’s Strategic Petroleum Reserve’s Big Hill site in Winnie, Texas. The visit is the first Secretarial appearance at an SPR field site in nine years, and it comes after a string of major SPR accomplishments in 2014.

  2. Tropical Warm Pool International Cloud Experiment TWP-ICE Cloud and rain characteristics in the Australian Monsoon

    SciTech Connect (OSTI)

    May, P.T., Jakob, C., and Mather, J.H.

    2004-05-31

    The impact of oceanic convection on its environment and the relationship between the characteristics of the convection and the resulting cirrus characteristics is still not understood. An intense airborne measurement campaign combined with an extensive network of ground-based observations is being planned for the region near Darwin, Northern Australia, during January-February, 2006, to address these questions. The Tropical Warm Pool International Cloud Experiment (TWP-ICE) will be the first field program in the tropics that attempts to describe the evolution of tropical convection, including the large scale heat, moisture, and momentum budgets, while at the same time obtaining detailed observations of cloud properties and the impact of the clouds on the environment. The emphasis will be on cirrus for the cloud properties component of the experiment. Cirrus clouds are ubiquitous in the tropics and have a large impact on their environment but the properties of these clouds are poorly understood. A crucial product from this experiment will be a dataset suitable to provide the forcing and testing required by cloud-resolving models and parameterizations in global climate models. This dataset will provide the necessary link between cloud properties and the models that are attempting to simulate them.

  3. ARM - Publications: Science Team Meeting Documents: Tropical...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Tropical Cloud Overlap Structure and Cloud Area Vogelmann, Andrew Brookhaven National Laboratory Jensen, Michael Brookhaven National Laboratory Boer, Erwin LUEBEC The Tropical ...

  4. Transient Mixed Convection Validation for NGNP

    SciTech Connect (OSTI)

    Smith, Barton; Schultz, Richard

    2015-10-19

    The results of this project are best described by the papers and dissertations that resulted from the work. They are included in their entirety in this document. They are: (1) Jeff Harris PhD dissertation (focused mainly on forced convection); (2) Blake Lance PhD dissertation (focused mainly on mixed and transient convection). This dissertation is in multi-paper format and includes the article currently submitted and one to be submitted shortly; and, (3) JFE paper on CFD Validation Benchmark for Forced Convection.

  5. Convective heat transfer inside passive solar buildings

    SciTech Connect (OSTI)

    Jones, R.W.; Balcomb, J.D.; Yamaguchi, K.

    1983-11-01

    Natural convection between spaces in a building which play a major role in energy transfer are discussed. Two situations are investigated: Convection through a single doorway into a remote room, and a convective loop in a two story house with a south sunspace where a north stairway serves as the return path. A doorway sizing equation is given for the single door case. Data from airflow monitoring in one two-story house and summary data for five others are presented. The nature of the airflow and design guidelines are presented.

  6. Convective heat transfer inside passive solar buildings

    SciTech Connect (OSTI)

    Jones, R.W.; Balcomb, J.D.; Yamaguchi, K.

    1983-01-01

    Natural convection between spaces in a building can play a major role in energy transfer. Two situations are investigated: convection through a single doorway into a remote room, and a convective loop in a two-story house with a south sunspace where a north stairway serves as the return path. A doorway-sizing equation is given for the single-door case. Detailed data are given from the monitoring of airflow in one two-story house and summary data are given for five others. Observations on the nature of the airflow and design guidelines are presented.

  7. Utilizing CLASIC observations and multiscale models to study the impact of improved Land surface representation on modeling cloud- convection

    SciTech Connect (OSTI)

    Niyogi, Devdutta S.

    2013-06-07

    The CLASIC experiment was conducted over the US southern great plains (SGP) in June 2007 with an objective to lead an enhanced understanding of the cumulus convection particularly as it relates to land surface conditions. This project was design to help assist with understanding the overall improvement of land atmosphere convection initiation representation of which is important for global and regional models. The study helped address one of the critical documented deficiency in the models central to the ARM objectives for cumulus convection initiation and particularly under summer time conditions. This project was guided by the scientific question building on the CLASIC theme questions: What is the effect of improved land surface representation on the ability of coupled models to simulate cumulus and convection initiation? The focus was on the US Southern Great Plains region. Since the CLASIC period was anomalously wet the strategy has been to use other periods and domains to develop the comparative assessment for the CLASIC data period, and to understand the mechanisms of the anomalous wet conditions on the tropical systems and convection over land. The data periods include the IHOP 2002 field experiment that was over roughly same domain as the CLASIC in the SGP, and some of the DOE funded Ameriflux datasets.

  8. Secretary Chu Visits Vogtle Nuclear Power Plant | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Vogtle Nuclear Power Plant Secretary Chu Visits Vogtle Nuclear Power Plant February 15, 2012 - 3:54pm Addthis Secretary Chu traveled to Waynesboro, Georgia, to visit the Vogtle nuclear power plant, the site of what will be the first new nuclear reactors to be built in the United States in three decades. | Image credit: Southern Company. Secretary Chu traveled to Waynesboro, Georgia, to visit the Vogtle nuclear power plant, the site of what will be the first new nuclear reactors to be built in

  9. June 1, 2015: Trinity Site Visit | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    1, 2015: Trinity Site Visit June 1, 2015: Trinity Site Visit June 1, 2015 The joint DOE/NPS team tours the Trinity Site on the White Sands Missile Range in southern New Mexico where the world's first nuclear explosion occurred on July 16, 1945. The team visits ground zero and the restored McDonald ranch house where the device's plutonium core was assembled. DOE/NPS team approaches ground zero at the Trinity Site Obelisk made of black lava rock at ground zero, with attached commemorative sign

  10. Convective Cooling and Passive Stack Improvements in Motors (Presentation)

    SciTech Connect (OSTI)

    Bennion, K.

    2014-06-01

    This presentation discusses current research at NREL in convective cooling and passive stack improvements in motors.

  11. Atmospheric Radiation Measurement Convective and Orographically Induced

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Convective and Orographically Induced Precipitation Study The U.S. Department of Energy's Atmospheric Radiation Measurement (ARM) Climate Research Facility is providing the ARM Mobile Facility (AMF) to support a long-term precipitation study in the Black Forest region of Germany. Requested by researchers from the University of Hohenheim, the AMF will be deployed as one of four heav- ily instrumented supersites established for the Convective and Orographically Induced Precipita- tion Study

  12. Secretary Bodman Visits Alberta, Canada | Department of Energy

    Energy Savers [EERE]

    Secretary Bodman Visits Alberta, Canada July 14, 2006 - 3:09pm Addthis Tour of Oil Sands ... Yesterday, Secretary Bodman toured the oil sands in Fort McMurray, Alberta, Canada with ...

  13. Secretary Chu Visits ENN Headquarters and Tianjin University...

    Energy Savers [EERE]

    Secretary Chu Visits ENN Headquarters and Tianjin University July 17, 2009 - 12:00am Addthis TIANJIN, CHINA - On the final day of his trip to China with Commerce Secretary Gary ...

  14. Lempke visits Savannah River Site | National Nuclear Security...

    National Nuclear Security Administration (NNSA)

    Lempke visits Savannah River Site May 29, 2013 at 11:00 am Blog archive October 2015 (8) September 2015 (9) August 2015 (10) July 2015 (8) June 2015 (6) May 2015 (18) April...

  15. Frelinghuysen, Holt visit PPPL to report on bipartisan efforts...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    U.S. Rep. Rush Holt (D-NJ-12), Plainsboro Mayor Peter Cantu, and PPPL Director Stewart Prager next to the National Spherical Torus Experiment (NSTX) during a June 13 visit...

  16. Leadership Knoxville visits Y-12 | Y-12 National Security Complex

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Class of 2015 recently visited Y-12. Tom Berg of Y-12 is a member of this year's class. According to their website, Leadership Knoxville's mission is to "build a stronger...

  17. Admiral Haney visits Pantex | National Nuclear Security Administration...

    National Nuclear Security Administration (NNSA)

    Haney told Pantexans that although they do not wear a military uniform, the work they do to protect America is as crucial as the work done by those who do. Admiral Haney visits ...

  18. Solar Powered Bike Visits the Department of Energy

    Broader source: Energy.gov [DOE]

    Marissa Muller set out on a mission to ignite a wellness revolution across America. She successfully travel 3,000+ miles on a solar-powered bicycle, visiting many states along the way and holding...

  19. Secretary Chu Visits the 2012 North American International Auto...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    2 North American International Auto Show Secretary Chu Visits the 2012 North American International Auto Show January 12, 2012 - 9:54am Addthis 1 of 10 Energy Secretary Steven Chu ...

  20. Deputy Under Secretary Klaus Visits the Fernald Preserve in Ohio...

    Energy Savers [EERE]

    (U.S. Army Interagency Fellow), Tania Smith Taylor (DOE LM), Gwen Hooten (DOE LM), ... Tania Smith Taylor said,"It was great to have Mr. Klaus visit the Fernald Preserve to see ...

  1. Southeastern visits local high school | Department of Energy

    Energy Savers [EERE]

    Southeastern visits local high school Southeastern visits local high school May 10, 2013 - 11:54am Addthis Southeastern employee, Dale Jett, uses a power system mockup to explain how power is distributed to homes. Southeastern employee, Dale Jett, uses a power system mockup to explain how power is distributed to homes. Southeastern employee, Sonya Hulme, describes the Power Marketing Administations and the ares that each one supports. Southeastern employee, Sonya Hulme, describes the Power

  2. Visiting Speaker Program - July 16, 2008 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    16, 2008 Visiting Speaker Program - July 16, 2008 The Visiting Speaker Program event with presentations on the effectiveness of collaboration within the federal government and current and future challenges facing agencies and the entire country. Assistant Secretary James Rispoli introduced Mr. Frank DiGiammarino and Mr. Jonathan Breul and made opening remarks at the program. Mr. DiGiammarino, NAPA Vice President of Strategic Initiatives, presented the topic of collaboration and its impacts on

  3. WEDNESDAY: Energy Secretary Moniz to Visit National Renewable Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Laboratory in Golden, Colorado | Department of Energy Moniz to Visit National Renewable Energy Laboratory in Golden, Colorado WEDNESDAY: Energy Secretary Moniz to Visit National Renewable Energy Laboratory in Golden, Colorado September 9, 2013 - 3:44pm Addthis News Media Contact (202) 586-4940 WASHINGTON - Building on President Obama's Climate Action Plan and the Administration's commitment to steady, responsible steps that reduce carbon pollution and support an all-of-the-above energy

  4. NNSA chief visits New Mexico laboratories | National Nuclear Security

    National Nuclear Security Administration (NNSA)

    Administration | (NNSA) chief visits New Mexico laboratories Monday, March 14, 2016 - 5:36pm The administrator saw wind turbines at Sandia National Laboratories like this model. NNSA Administrator Lt. Gen. Frank Klotz (Ret.) visited NNSA's New Mexico laboratories last week. At Sandia National Laboratories (SNL) and Los Alamos National Laboratory (LANL), Klotz addressed the workforces of both labs on how the FY17 budget request supports NNSA's missions, and he got a first-hand look at some of

  5. NNSA deputy visits PNNL to see radiochemistry and threat detection

    National Nuclear Security Administration (NNSA)

    capabilities | National Nuclear Security Administration | (NNSA) visits PNNL to see radiochemistry and threat detection capabilities Friday, June 24, 2016 - 8:54am NNSA Principal Deputy Administrator Madelyn Creedon visited the Pacific Northwest National Laboratory (PNNL) in Washington this month to see the work it does for the agency, focusing on radiochemistry and threat detection. Creedon heard from Bob Runkle, PNNL's Chief Science and Technology Officer for National Security about the

  6. Thornberry hosts House Majority Leader at Pantex visit | National Nuclear

    National Nuclear Security Administration (NNSA)

    Security Administration | (NNSA) Thornberry hosts House Majority Leader at Pantex visit Tuesday, October 27, 2015 - 12:00am Thornberry hosts House Majority Leader at Pantex visit Rep. Mac Thornberry, R-Texas, hosted Majority Leader Kevin McCarthy, R-CA, at both Pantex and Bell Helicopter in Amarillo recently to discuss the Texas Panhandle's role in national security. At Pantex, Thornberry and McCarthy viewed the High Explosives Pressing Facility along with the locations where nuclear weapons

  7. Klotz visits Bettis Atomic Power Laboratory | National Nuclear Security

    National Nuclear Security Administration (NNSA)

    Administration | (NNSA) Klotz visits Bettis Atomic Power Laboratory Wednesday, July 8, 2015 - 1:03pm Lt. Gen. Frank G. Klotz, DOE Undersecretary for Nuclear Security and NNSA Administrator, visited the Bettis Atomic Power Laboratory in West Mifflin, PA on July 2, 2015. NNSA Blog Gen. Klotz toured through several test facilities where Bettis personnel reviewed ongoing development efforts to qualify techniques for in-situ repairs of nuclear powered submarine components, discussed full scale

  8. Media Advisory -- Director of National Science Foundation to Visit Colorado

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Media Advisory -- Director of National Science Foundation to Visit Colorado For more information contact: Contact: Kerry Masson, NREL 275-4083 David Grimm, CU 492-6206 Tom Milligan, CSU 970-491-6432 Golden, Colo., Feb. 28, 1997 -- Media are invited to cover the visit of Dr. Neal Lane, Director of the National Science Foundation, to Colorado March 6 - 7. Dr. Lane will meet with leaders of the scientific community, business and industry and the state government to discuss federal support for

  9. Lt. Governor Guadagno Visits PPPL | Princeton Plasma Physics Lab

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Lt. Governor Guadagno Visits PPPL February 14, 2012 Tweet Widget Google Plus One Share on Facebook (Photo by Elle Starkman, PPPL Office of Communications) Gallery: (Photo by Elle Starkman, PPPL Office of Communications) PLAINSBORO, N.J. - New Jersey Lieutenant Governor Kim Guadagno visited the U.S. Department of Energy's Princeton Plasma Physics Laboratory (PPPL) on Monday, Feb. 13, learning about the economic impact of the facility upon the state and gleaning new facts about fusion science.

  10. Hyundai Tucson Fuel Cell Electric Vehicle visits Department of Energy |

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Department of Energy Hyundai Tucson Fuel Cell Electric Vehicle visits Department of Energy Hyundai Tucson Fuel Cell Electric Vehicle visits Department of Energy September 26, 2014 - 3:34pm Addthis Deputy Secretary Daniel Poneman test drove the Hyundai Tucson Fuel Cell vehicle when the car made an appearance at the Department of Energy headquarters in Washington, D.C. Deputy Secretary Daniel Poneman test drove the Hyundai Tucson Fuel Cell vehicle when the car made an appearance at the

  11. Scientists Inspiring Kids: Students visit our National Labs | Department of

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Energy Inspiring Kids: Students visit our National Labs Scientists Inspiring Kids: Students visit our National Labs March 4, 2016 - 4:20pm Addthis Students tour the National Energy Technology Lab (NETL) as part of My Brother's Keeper Week at the Labs. | Photo courtesy of NETL. Students tour the National Energy Technology Lab (NETL) as part of My Brother's Keeper Week at the Labs. | Photo courtesy of NETL. Allison Lantero Allison Lantero Digital Content Specialist, Office of Public Affairs My

  12. Secretary Chu Visits Japanese Embassy | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Japanese Embassy Secretary Chu Visits Japanese Embassy March 25, 2011 - 12:00am Addthis Washington, DC - Earlier this evening, Energy Secretary Steven Chu visited the Japanese Embassy in Washington, D.C., to sign a book of condolence for the victims of the recent tsunami and earthquakes that have impacted the country. The Secretary also met with Ambassador Ichiro Fujisaki to express his support for the people of Japan and to reaffirm the United States' continued commitment to assist the Japanese

  13. Department of Energy's chief risk officer visits Nevada National Security

    National Nuclear Security Administration (NNSA)

    Site | National Nuclear Security Administration | (NNSA) Department of Energy's chief risk officer visits Nevada National Security Site Thursday, March 10, 2016 - 10:54am Earlier this month, Associate Deputy Secretary John MacWilliams visited the Nevada National Security Site (NNSS) in his role as Chief Risk Officer for the Department of Energy. He reviewed the various ways the NNSS contributes to the department's and NNSA's missions, including radiological detection, emergency management,

  14. Visiting Faculty Program (VFP) | Princeton Plasma Physics Lab

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Visiting Faculty Program (VFP) The Visiting Faculty Program is for faculty from colleges and universities with limited research facilities and from those institutions serving populations underrepresented in the fields of science, engineering, and technology. The VFP supports teams comprised of one faculty member and 2 - 3 undergraduate students, who undertake hands-on research at PPPL during the summer months. The VFP faculty applicant (students do not apply directly) works collaboratively with

  15. Investor and entrepreneur visits Los Alamos for open coffee

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Investor and entrepreneur visits for open coffee Investor and entrepreneur visits Los Alamos for open coffee Brad Feld, a renowned early-stage investor and entrepreneur, will attend a meeting of the Open Coffee Club networking event. March 29, 2010 Los Alamos National Laboratory sits on top of a once-remote mesa in northern New Mexico with the Jemez mountains as a backdrop to research and innovation covering multi-disciplines from bioscience, sustainable energy sources, to plasma physics and new

  16. WEDNESDAY: Energy Secretary Moniz to Visit National Renewable Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Laboratory in Golden, Colorado | Department of Energy Energy Secretary Moniz to Visit National Renewable Energy Laboratory in Golden, Colorado WEDNESDAY: Energy Secretary Moniz to Visit National Renewable Energy Laboratory in Golden, Colorado September 9, 2013 - 3:44pm Addthis NEWS MEDIA CONTACT (202) 586-4940 WASHINGTON - Building on President Obama's Climate Action Plan and the Administration's commitment to steady, responsible steps that reduce carbon pollution and support an

  17. My Brother's Keeper Visits the National Labs | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    My Brother's Keeper Visits the National Labs My Brother's Keeper Visits the National Labs August 25, 2015 - 12:47pm Addthis A group of students gets a tour of the National Ignition Facility at Lawrence Livermore National Lab as part of the My Brothers Keeper Initiative. | Photo courtesy of Lawrence Livermore National Lab. A group of students gets a tour of the National Ignition Facility at Lawrence Livermore National Lab as part of the My Brothers Keeper Initiative. | Photo courtesy of Lawrence

  18. Cleanup Chief Visits Portsmouth, Paducah Sites | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Cleanup Chief Visits Portsmouth, Paducah Sites Cleanup Chief Visits Portsmouth, Paducah Sites February 11, 2016 - 12:45pm Addthis EM Assistant Secretary Dr. Monica Regalbuto sits in on a procedure review with facility operator Jim Burnett (left) of Fluor Paducah Deactivation Project at C-337, where a former uranium enrichment process building will be the first facility to undergo deposit removal by in-situ chemical treatment. EM Assistant Secretary Dr. Monica Regalbuto sits in on a procedure

  19. Proceedings of the scientific visit on crystalline rock repository development.

    SciTech Connect (OSTI)

    Mariner, Paul E.; Hardin, Ernest L.; Miksova, Jitka

    2013-02-01

    A scientific visit on Crystalline Rock Repository Development was held in the Czech Republic on September 24-27, 2012. The visit was hosted by the Czech Radioactive Waste Repository Authority (RAWRA), co-hosted by Sandia National Laboratories (SNL), and supported by the International Atomic Energy Agency (IAEA). The purpose of the visit was to promote technical information exchange between participants from countries engaged in the investigation and exploration of crystalline rock for the eventual construction of nuclear waste repositories. The visit was designed especially for participants of countries that have recently commenced (or recommenced) national repository programmes in crystalline host rock formations. Discussion topics included repository programme development, site screening and selection, site characterization, disposal concepts in crystalline host rock, regulatory frameworks, and safety assessment methodology. Interest was surveyed in establishing a %E2%80%9Cclub,%E2%80%9D the mission of which would be to identify and address the various technical challenges that confront the disposal of radioactive waste in crystalline rock environments. The idea of a second scientific visit to be held one year later in another host country received popular support. The visit concluded with a trip to the countryside south of Prague where participants were treated to a tour of the laboratory and underground facilities of the Josef Regional Underground Research Centre.

  20. Explicit simulation of a midlatitude Mesoscale Convective System

    SciTech Connect (OSTI)

    Alexander, G.D.; Cotton, W.R.

    1996-04-01

    We have explicitly simulated the mesoscale convective system (MCS) observed on 23-24 June 1985 during PRE-STORM, the Preliminary Regional Experiment for the Stormscale Operational and Research and Meterology Program. Stensrud and Maddox (1988), Johnson and Bartels (1992), and Bernstein and Johnson (1994) are among the researchers who have investigated various aspects of this MCS event. We have performed this MCS simulation (and a similar one of a tropical MCS; Alexander and Cotton 1994) in the spirit of the Global Energy and Water Cycle Experiment Cloud Systems Study (GCSS), in which cloud-resolving models are used to assist in the formulation and testing of cloud parameterization schemes for larger-scale models. In this paper, we describe (1) the nature of our 23-24 June MCS dimulation and (2) our efforts to date in using our explicit MCS simulations to assist in the development of a GCM parameterization for mesoscale flow branches. The paper is organized as follows. First, we discuss the synoptic situation surrounding the 23-24 June PRE-STORM MCS followed by a discussion of the model setup and results of our simulation. We then discuss the use of our MCS simulation. We then discuss the use of our MCS simulations in developing a GCM parameterization for mesoscale flow branches and summarize our results.

  1. CONVECTIVE BABCOCK-LEIGHTON DYNAMO MODELS

    SciTech Connect (OSTI)

    Miesch, Mark S.; Brown, Benjamin P.

    2012-02-20

    We present the first global, three-dimensional simulations of solar/stellar convection that take into account the influence of magnetic flux emergence by means of the Babcock-Leighton (BL) mechanism. We have shown that the inclusion of a BL poloidal source term in a convection simulation can promote cyclic activity in an otherwise steady dynamo. Some cycle properties are reminiscent of solar observations, such as the equatorward propagation of toroidal flux near the base of the convection zone. However, the cycle period in this young sun (rotating three times faster than the solar rate) is very short ({approx}6 months) and it is unclear whether much longer cycles may be achieved within this modeling framework, given the high efficiency of field generation and transport by the convection. Even so, the incorporation of mean-field parameterizations in three-dimensional convection simulations to account for elusive processes such as flux emergence may well prove useful in the future modeling of solar and stellar activity cycles.

  2. Clifton Truman Daniel's visit to Oak Ridge and Y-12, part 2

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    2 President Harry S. Truman's grandson, Clifton Truman Daniel, after visiting Japan to attend an anniversary of the bombing of Hiroshima and Nagasaki, recently visited Oak Ridge to...

  3. Low enthalpy convective system in Western Ohio

    SciTech Connect (OSTI)

    Cannon, M.S.; Tabet, C.A.; Eckstein, Y.

    1980-01-01

    A distinct positive anomaly in the temperatures of the shallow (Pleistocene) aquifers along the Cincinnati-Findlay Arch in Western Ohio coincides with a low geothermal gradient. A conceptual model of convective currents associated with a tensional fault and/or fracture system along the crest of the Arch is suggested as an explanation of the anomaly. Hydrochemical information indicates that various quantities of warmer ground water, with the composition characteristics of deep bedrock aquifers, is present as an admixture in the shallow aquifers. This confirms the conceptual model of convection in fractures.

  4. Geothermal reservoirs in hydrothermal convection systems

    SciTech Connect (OSTI)

    Sorey, M.L.

    1982-01-01

    Geothermal reservoirs commonly exist in hydrothermal convection systems involving fluid circulation downward in areas of recharge and upwards in areas of discharge. Because such reservoirs are not isolated from their surroundings, the nature of thermal and hydrologic connections with the rest of the system may have significant effects on the natural state of the reservoir and on its response to development. Conditions observed at numerous developed and undeveloped geothermal fields are discussed with respect to a basic model of the discharge portion of an active hydrothermal convection system. Effects of reservoir development on surficial discharge of thermal fluid are also delineated.

  5. VisIt Version 2.0.1

    Energy Science and Technology Software Center (OSTI)

    2010-06-01

    VisIt is an interactive parallel visualization and graphical analysis tool for viewing scientific data on UNIX and PC platforms, Users can quickly generate visualizations from their data, animate them through time, manipulate them, and save the resulting images for presentations, VisIt contains a rich set of visualization features so that you can view your data in a variety of ways. It can be used to visualize scalar and vector fields defined on two and threemore » dimensional (2D and 3D) structured and unstructured meshes. VisIt was designed to handle very large data set sizes in the terascale range and yet can also handle small data sets in kilobyte range.« less

  6. Admiral Haney visits New Mexico labs | National Nuclear Security

    National Nuclear Security Administration (NNSA)

    Administration | (NNSA) Admiral Haney visits New Mexico labs Wednesday, January 15, 2014 - 11:00am Admiral Cecil D. Haney, Commander of USSTRATCOM, recently visited Los Alamos and Sandia national laboratories. Admiral Haney and Lab Director Charlie McMillan stand in front of the Army-Navy E (as in excellence) Flag awarded to the Lab at the end of World War II. At Sandia, Admiral Haney met with President and Labs Director Paul Hommert and addressed the workforce that afternoon. Admiral Haney

  7. U.S. Energy Secretary Visits Kuwait | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Kuwait U.S. Energy Secretary Visits Kuwait November 15, 2005 - 2:30pm Addthis Stop included meeting with U.S. business leaders and military troops KUWAIT CITY, KUWAIT - On Monday, November 14, 2005, U.S. Department of Energy Secretary Samuel W. Bodman toured the EQUATE petrochemical plant and met with U.S. business representatives while visiting Kuwait, as part of his trip through the Middle East. The EQUATE petrochemical plant is a joint venture between Kuwait's Petrochemical Industries Company

  8. Energy Secretary Steven Chu Visits Oak Ridge | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Visits Oak Ridge Energy Secretary Steven Chu Visits Oak Ridge March 23, 2010 - 12:00am Addthis OAK RIDGE, TN - At an event earlier this afternoon at Oak Ridge National Laboratory, U.S. Energy Secretary Steven Chu announced that DOE has issued a five-year extension to its current management and operating contractor, UT-Battelle, LLC, for the continued operation of the Oak Ridge National Laboratory (ORNL) in Oak Ridge, Tennessee. While at Oak Ridge, Secretary Chu also met with staff from the

  9. Planetary scientist to discuss Curiosity rover's visit to Mars

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Scientist to discuss Curiosity rover's visit to Mars Planetary scientist to discuss Curiosity rover's visit to Mars Agnes Cousin-Pilleri will discuss the trailblazing discoveries made by the ChemCam instrument on the Curiosity rover on Mars on May 28. May 23, 2014 Curiosity zaps Mars for vital signs: ChemCam, designed by Lab team, looks for elements such as carbon, nitrogen, and oxygen, all of which are crucial for life. Curiosity zaps Mars for vital signs: ChemCam, designed by Lab team, looks

  10. Secretary Moniz Visits Oak Ridge National Laboratory | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Visits Oak Ridge National Laboratory Secretary Moniz Visits Oak Ridge National Laboratory June 5, 2013 - 3:18pm Addthis Energy Secretary Moniz at CASL 1 of 25 Energy Secretary Moniz at CASL Secretary Moniz tours the Consortium for Advanced Simulation of Light Water Reactors (CASL) facility at Oak Ridge National Laboratory (ORNL). CASL is one of the Energy Department's Energy Innovation Hubs. Date taken: 2013-06-03 12:04 Energy Secretary Moniz at CASL 2 of 25 Energy Secretary Moniz at CASL (From

  11. DOE's Top Environmental Cleanup Official Visits Paducah Site | Department

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    of Energy DOE's Top Environmental Cleanup Official Visits Paducah Site DOE's Top Environmental Cleanup Official Visits Paducah Site April 26, 2012 - 2:00pm Addthis DOE-EM Senior Advisor Dave Huizenga, right, and DOE Paducah Site Lead Reinhard Knerr look at a three-dimensional model of the Paducah Site’s groundwater system. University of Kentucky College of Design students assembled the model for the Paducah Citizens Advisory Board. The model was displayed at the Site-Specific Advisory

  12. State Department's TechWomen 2012 Visit NERSC

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    State Department's TechWomen 2012 Visit NERSC State Department's TechWomen 2012 Visit NERSC October 2, 2012 Contact: Linda Vu, lvu@lbl.gov, +1 510 495 2402 XBD201209-01138-24.jpg 2012 TechWomen at NERSC. Photo by Roy Kaltschmidt, Berkeley Lab Thirty women from the United States Department of State's 2012 TechWomen cultural exchange toured the Department of Energy's National Energy Research Scientific Computing Center (NERSC) at the Lawrence Berkeley National Laboratory's (Berkeley Lab) Oakland

  13. Convectively driven PCR thermal-cycling

    DOE Patents [OSTI]

    Benett, William J.; Richards, James B.; Milanovich, Fred P.

    2003-07-01

    A polymerase chain reaction system provides an upper temperature zone and a lower temperature zone in a fluid sample. Channels set up convection cells in the fluid sample and move the fluid sample repeatedly through the upper and lower temperature zone creating thermal cycling.

  14. Secretary Moniz Meets with Employees, Tribal Leaders during Hanford Visit and Site Tour

    Broader source: Energy.gov [DOE]

    RICHLAND, Wash. Energy Secretary Ernest Moniz recently visited the Hanford site in southeastern Washington State.

  15. Hanford/Tomsk reciprocal site visit: Plutonium agreement compliance talks

    SciTech Connect (OSTI)

    Libby, R.A.; Sorenson, R.; Six, D.; Schiegel, S.C.

    1994-11-01

    The objective of the visit to Hanford Site was to: demonstrate equipment, technology, and methods for calculating Pu production, measuring integrated reactor power, and storing and safeguarding PuO{sub 2}; demonstrate the shutdown of Hanford production reactors; and foster openness and transparency of Hanford operations. The first day`s visit was an introduction to Hanford and a review of the history of the reactors. The second day consisted of discussions on the production reactors, reprocessing operations, and PuO{sub 2} storage. The group divided on the third day to tour facilities. Group A toured the N reactor, K-West reactor, K-West Basins, B reactor, and participated in a demonstration and discussion of reactor modeling computer codes. Group B toured the Hanford Pu Storage Facility, 200-East Area, N-cell (oxide loadout station), the Automated Storage Facility, and the Nondestructive Assay Measurement System. Group discussions were held during the last day of the visit, which included scheduling of a US visit to Russia.

  16. Linkages of Remote Sea Surface Temperatures and Atlantic Tropical Cyclone Activity Mediated by the African Monsoon

    SciTech Connect (OSTI)

    Taraphdar, Sourav; Leung, Lai-Yung R.; Hagos, Samson M.

    2015-01-28

    Warm sea surface temperatures (SSTs) in North Atlantic and Mediterranean (NAMED) can influence tropical cyclone (TC) activity in the tropical East Atlantic by modulating summer convection over western Africa. Analysis of 30 years of observations show that the NAMED SST is linked to a strengthening of the Saharan heat low and enhancement of moisture and moist static energy in the lower atmosphere over West Africa, which favors a northward displacement of the monsoonal front. These processes also lead to a northward shift of the African easterly jet that introduces an anomalous positive vorticity from western Africa to the main development region (50W20E; 10N20N) of Atlantic TC. By modulating multiple processes associated with the African monsoon, this study demonstrates that warm NAMED SST explains 8% of interannual variability of Atlantic TC frequency. Thus NAME SST may provide useful predictability for Atlantic TC activity on seasonal-to-interannual time scale.

  17. Radiative Heating of the ISCCP Upper Level Cloud Regimes and its Impact on the Large-scale Tropical Circulation

    SciTech Connect (OSTI)

    Li, Wei; Schumacher, Courtney; McFarlane, Sally A.

    2013-01-31

    Radiative heating profiles of the International Satellite Cloud Climatology Project (ISCCP) cloud regimes (or weather states) were estimated by matching ISCCP observations with radiative properties derived from cloud radar and lidar measurements from the Department of Energy (DOE) Atmospheric Radiation Measurement (ARM) sites at Manus, Papua New Guinea, and Darwin, Australia. Focus was placed on the ISCCP cloud regimes containing the majority of upper level clouds in the tropics, i.e., mesoscale convective systems (MCSs), deep cumulonimbus with cirrus, mixed shallow and deep convection, and thin cirrus. At upper levels, these regimes have average maximum cloud occurrences ranging from 30% to 55% near 12 km with variations depending on the location and cloud regime. The resulting radiative heating profiles have maxima of approximately 1 K/day near 12 km, with equal heating contributions from the longwave and shortwave components. Upper level minima occur near 15 km, with the MCS regime showing the strongest cooling of 0.2 K/day and the thin cirrus showing no cooling. The gradient of upper level heating ranges from 0.2 to 0.4 K/(day∙km), with the most convectively active regimes (i.e., MCSs and deep cumulonimbus with cirrus) having the largest gradient. When the above heating profiles were applied to the 25-year ISCCP data set, the tropics-wide average profile has a radiative heating maximum of 0.45Kday-1 near 250 hPa. Column-integrated radiative heating of upper level cloud accounts for about 20% of the latent heating estimated by the Tropical Rainfall Measuring Mission (TRMM) Precipitation Radar (PR). The ISCCP radiative heating of tropical upper level cloud only slightly modifies the response of an idealized primitive equation model forced with the tropics-wide TRMM PR latent heating, which suggests that the impact of upper level cloud is more important to large-scale tropical circulation variations because of convective feedbacks rather than direct forcing by

  18. State and Tribal Government Working Group Visits the Weldon Spring Site |

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Department of Energy Weldon Spring Site State and Tribal Government Working Group Visits the Weldon Spring Site June 1, 2011 - 3:18pm Addthis State and Tribal Government Working Group Visits the Weldon Spring Site State and Tribal Government Working Group Visits the Weldon Spring Site State and Tribal Government Working Group Visits the Weldon Spring Site State and Tribal Government Working Group Visits the Weldon Spring Site What does this project do? Goal 1. Protect human health and the

  19. The Phenix ultimate natural convection test

    SciTech Connect (OSTI)

    Gauthe, P.; Pialla, D.; Tenchine, D.; Vasile, A.; Rochwerger, D.

    2012-07-01

    The French sodium cooled fast reactor Phenix was shut down in 2009 after 35 years of operation. Before decommissioning, a final set of tests were performed by the CEA during 9 months. Several topics were involved such as thermal hydraulics, core physics and fuel behaviour. Among these ultimate experiments, two thermal hydraulic tests were performed: an asymmetrical test consisting in a trip of one secondary pump and a natural convection test in the primary circuit. Recognizing the unique opportunity offered by these Phenix ultimate tests, IAEA decided in 2007 to launch a Coordinated Research Project (CRP) devoted to benchmarking analyses with system codes on the Phenix natural convection test. One objective of the natural convection test in Phenix reactor is the assessment of the CATHARE system code for safety studies on future and advanced sodium cooled fast reactors. The aim of this paper is to describe this test, which was performed on June 22-23, 2009, and the associated benchmark specifications for the CRP work. The paper reminds briefly the Phenix reactor with the main physical parameters and the instrumentation used during the natural convection test. After that, the test scenario is described: - initial state at a power of 120 MWth, - test beginning resulting from a manual dry out of the two steam generators, - manual scram, - manual trip on the three primary pumps without back-up by pony motors, - setting and development of natural convection in the primary circuit, in a first phase without significant heat sink in the secondary circuits and in a second phase with significant heat sink in the secondary circuits, by opening the casing of steam generators to create an efficient heat sink, by air natural circulation in the steam generators casing. The benchmark case ends after this second phase, which corresponds to the experimental test duration of nearly 7 hours. The paper presents also the benchmark specifications data supplied by the CEA to all

  20. Midlatitude Continental Convective Clouds Experiment Science Objective

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Midlatitude Continental Convective Clouds Experiment Science Objective Despite improvements in computing power, current weather and climate models are unable to accurately reproduce the formation, growth, and decay of clouds and precipitation associated with storm systems. Not only is this due to a lack of data about precipitation, but also about the 3-dimensional environment of the surrounding clouds, winds, and moisture, and how that affects the transfer of energy between the sun and Earth. To

  1. Evaluation of tropical cloud and precipitation statistics of CAM3 using CloudSat and CALIPSO data

    SciTech Connect (OSTI)

    Zhang, Y; Klein, S; Boyle, J; Mace, G G

    2008-11-20

    The combined CloudSat and CALIPSO satellite observations provide the first simultaneous measurements of cloud and precipitation vertical structure, and are used to examine the representation of tropical clouds and precipitation in the Community Atmosphere Model Version 3 (CAM3). A simulator package utilizing a model-to-satellite approach facilitates comparison of model simulations to observations, and a revised clustering method is used to sort the subgrid-scale patterns of clouds and precipitation into principal cloud regimes. Results from weather forecasts performed with CAM3 suggest that the model underestimates the horizontal extent of low and mid-level clouds in subsidence regions, but overestimates that of high clouds in ascending regions. CAM3 strongly overestimates the frequency of occurrence of the deep convection with heavy precipitation regime, but underestimates the horizontal extent of clouds and precipitation at low and middle levels when this regime occurs. This suggests that the model overestimates convective precipitation and underestimates stratiform precipitation consistent with a previous study that used only precipitation observations. Tropical cloud regimes are also evaluated in a different version of the model, CAM3.5, which uses a highly entraining plume in the parameterization of deep convection. While the frequency of occurrence of the deep convection with heavy precipitation regime from CAM3.5 forecasts decreases, the incidence of the low clouds with precipitation and congestus regimes increases. As a result, the parameterization change does not reduce the frequency of precipitating convection that is far too high relative to observations. For both versions of CAM, clouds and precipitation are overly reflective at the frequency of the CloudSat radar and thin clouds that could be detected by the lidar only are underestimated.

  2. NNSA Deputy Administrator for Defense Nuclear Nonproliferation visits Oak

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Ridge | Y-12 National Security Complex NNSA Deputy Administrator ... NNSA Deputy Administrator for Defense Nuclear Nonproliferation visits Oak Ridge Posted: January 25, 2016 - 1:12pm NNSA Deputy Administrator for Defense Nuclear Nonproliferation Anne Harrington addresses the East Tennessee Economic Council. Making the world a safer place. That is the message Anne Harrington delivered to the East Tennessee Economic Council about NNSA's role in nuclear nonproliferation. Harrington, Deputy

  3. Visiting Speaker Program - July 28, 2010 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    8, 2010 Visiting Speaker Program - July 28, 2010 Panel Discussion Science, Technology, and Innovation: Imperatives for National and Economic Security These panel discussions were co-sponsored by the Center for Strategic and International Studies, with introductions by Dr. John Hamre, President and CEO of CSIS, and keynote remarks by Dr. Steven E. Koonin (Under Secretary for Science at the Department of Energy) and by Dr. James Short ( Deputy Director, University of Maryland Center for Energetic

  4. Visiting Speaker Program - May 12, 2011 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    May 12, 2011 Visiting Speaker Program - May 12, 2011 Panel Discussion Suspect Counterfeit Parts: The Impact on Our National and Economic Security The panel discussion examining the severity of the issue of counterfeit components, its effects on our national and economic stability and security, and what steps are taken to mitigate this threat. Documents Available for Download Pictorial recap and summary highlights of the event (1.02 MB) Aerospace Industry: Challenges and Combating Counterfeit

  5. Visiting Speaker Program - October 30, 2008. | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    30, 2008. Visiting Speaker Program - October 30, 2008. Dr. Susan Butts is Senior Director of External Science and Technology Programs at The Dow Chemical Company. In this capacity she is responsible for Dow's contract research activities with US and European government agencies and sponsored research programs at over 100 universities, institutes, and national laboratories worldwide. She has also held the role of Global Staffing Leader in which she managed recruiting and hiring activities for the

  6. Visiting Speaker Program - September 15, 2008 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    5, 2008 Visiting Speaker Program - September 15, 2008 Mr. Erik Peterson gave a presentation of the "Seven Revolutions" and their applicability to DOE and DOE's roles in helping to solve national issues. Founded in 1962, the Center for Strategic and International Studies (CSIS) provides strategic insights and policy solutions to decision makers in government, international institutions, the private sector, and civil society. A bipartisan, nonprofit organization headquartered in

  7. Visiting Speaker Program - September 18, 2008 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    8, 2008 Visiting Speaker Program - September 18, 2008 Mr. Jeff Erickson will discuss the business and industrial models of sustainability and the impact of sustainability on organizations. SustainAbility is a strategic consulting firm and independent think tank established in 1987 with specialty services in sustainable development and corporate responsibility. With offices in Washington, London, and Zurich, SustainAbility utilizes the talents of its multidisciplinary personnel to work in teams

  8. DOE-EERE Deputy Assistant Secretary Hollett Visits Sandia

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    EERE Deputy Assistant Secretary Hollett Visits Sandia - Sandia Energy Energy Search Icon Sandia Home Locations Contact Us Employee Locator Energy & Climate Secure & Sustainable Energy Future Stationary Power Energy Conversion Efficiency Solar Energy Wind Energy Water Power Supercritical CO2 Geothermal Natural Gas Safety, Security & Resilience of the Energy Infrastructure Energy Storage Nuclear Power & Engineering Grid Modernization Battery Testing Nuclear Energy Defense Waste

  9. Site Visit Report, Hanford Waste Encapsulation Storage Facility - January

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    2011 | Department of Energy Hanford Waste Encapsulation Storage Facility - January 2011 Site Visit Report, Hanford Waste Encapsulation Storage Facility - January 2011 January 2011 Hanford Waste Encapsulation Storage Facility Documented Safety Analysis results of a review conducted by the Department of Energy's Office of Health, Safety and Security (HSS) of the documented safety analysis for the Waste Encapsulation Storage Facility at DOE's Hanford Site. The review was performed from July

  10. Site Visit Report, Lawrence Livermore National Laboratory - February 2011 |

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Department of Energy Lawrence Livermore National Laboratory - February 2011 Site Visit Report, Lawrence Livermore National Laboratory - February 2011 February 2011 Lawrence Livermore National Laboratory Safety Basis Assessment TThis report documents the collective results of a review of the Lawrence Livermore National Laboratory's safety basis processes. The review was conducted jointly by Office of Health, Safety and Security's (HSS) Office of Safety and Emergency Management Evaluations and

  11. Sandia National Laboratories: Locations: Albuquerque, New Mexico: Visiting

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Sandia/New Mexico New Mexico Sandia/New Mexico administration building Access to Sandia's Albuquerque, New Mexico, site is limited to visitors with valid business purposes. Arrangements to visit Sandia must be made beforehand with a sponsoring Sandian. Directions Sandia/New Mexico is located on Kirtland Air Force Base (KAFB) in southeastern Albuquerque. If you are driving, you can easily find us by: Proceeding south from I-40 on Eubank Boulevard, or Proceeding south from I-40 on Wyoming

  12. Rep. Rush Holt Visits TCHS | Princeton Plasma Physics Lab

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Rep. Rush Holt Visits TCHS View larger image IMG 1492 View larger image IMG 1495 View larger image IMG 1497 View larger image IMG 1503 View larger image IMG 1505 View larger image IMG 1507 View larger image IMG 1517 View larger image IMG 1514 View larger image IMG 1519 View larger image IMG 1521 View larger image IMG 1537 View larger image IMG 1542 View larger image IMG 1546 View larger image IMG 1550

  13. Department of Defense Benchmarks VPP in Visit to Hanford

    Office of Energy Efficiency and Renewable Energy (EERE)

    Representatives of the Department of Defense's (DoD's) Voluntary Protection Program Center of Excellence (VPP-CX) are working to meet a safety and health goal established by Secretary of Defense Donald Rumsfeld to reduce injuries at DoD sites nationwide. In order to accomplish this goal, DoD visited the Department of Energy's (DOE's) Hanford Site in southeast Washington State on December 12, 2005, to learn about its exemplary safety programs and benchmark the site's VPP effort.

  14. Ecotoxicology of tropical marine ecosystems

    SciTech Connect (OSTI)

    Peters, E.C.; Gassman, N.J.; Firman, J.C.; Richmond, R.H.; Power, E.A.

    1997-01-01

    The negative effects of chemical contaminants on tropical marine ecosystems are of increasing concern as human populations expand adjacent to these communities. Watershed streams and ground water carry a variety of chemicals from agricultural, industrial, and domestic activities, while winds and currents transport pollutants from atmospheric and oceanic sources to these coastal ecosystems. The implications of the limited information available on impacts of chemical stressors on mangrove forests, seagrass meadows, and coral reefs are discussed in the context of ecosystem management and ecological risk assessment. Three classes of pollutants have received attention: heavy metals, petroleum, and synthetic organics. Heavy metals have been detected in all three ecosystems, causing physiological stress, reduced reproductive success, and outright mortality in associated invertebrates and fishes. Oil spills have been responsible for the destruction of entire coastal shallow-water communities, with recovery requiring years. Herbicides are particularly detrimental to mangroves and seagrasses and adversely affect the animal-algal symbioses in corals. Pesticides interfere with chemical cues responsible for key biological processes, including reproduction and recruitment of a variety of organisms. Information is lacking with regard to long-term recovery, indicator species, and biomarkers for tropical communities. Critical areas that are beginning to be addressed include the development of appropriate benchmarks for risk assessment, baseline monitoring criteria, and effective management strategies to protect tropical marine ecosystems in the face of mounting anthropogenic disturbance.

  15. EM Leaders Visit with Children in Day Dedicated to Learning About...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Leaders Visit with Children in Day Dedicated to Learning About Cleanup EM Leaders Visit with Children in Day Dedicated to Learning About Cleanup May 16, 2016 - 12:35pm Addthis Team ...

  16. Tropical Forest Foundation | Open Energy Information

    Open Energy Info (EERE)

    Virginia. About "The Tropical Forest Foundation (TFF) is an international, non-profit, educational institution committed to advancing environmental stewardship, economic...

  17. Tropical Cloud Life Cycle and Overlap Structure

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Tropical Cloud Life Cycle and Overlap Structure Vogelmann, Andrew Brookhaven National Laboratory Jensen, Michael Brookhaven National Laboratory Kollias, Pavlos Brookhaven National ...

  18. Differences between nonprecipitating tropical and trade wind...

    Office of Scientific and Technical Information (OSTI)

    wind marine shallow cumuli This content will become publicly available on November 13, 2016 Prev Next Title: Differences between nonprecipitating tropical and trade wind ...

  19. ARM - Field Campaign - Midlatitude Continental Convective Clouds Experiment

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    (MC3E) Experiment (MC3E) Campaign Links Science Plan MC3E Website Field Campaign Report ARM Data Discovery Browse Data Related Campaigns Midlatitude Continental Convective Clouds Experiment (MC3E): Inner Domain Thermodynamic Profiling during MC3E 2011.04.22, Turner, SGP Midlatitude Continental Convective Clouds Experiment (MC3E): Multi-Frequency Profilers 2011.04.22, Williams, SGP Midlatitude Continental Convective Clouds Experiment: 2DVD Support 2011.04.22, Schwaller, SGP Midlatitude

  20. Natural convection airflow measurement and theory

    SciTech Connect (OSTI)

    Balcomb, J.D.; Jones, G.F.; Yamaguchi, Kenjiro

    1984-01-01

    Natural convection is a major mechanism for heat distribution in many passive solar buildings, especially those with sunspaces. To better understand this mechanism, observations of air velocities and temperatures have been made in 13 different houses that encompass a wide variety of one- and two-story geometries. This paper extends previous reports. Results from one house are described in detail, and some generalizations are drawn from the large additional mass of data taken. A simple mathematical model is presented that describes the general nature of airflow and energy flow through an aperture.

  1. Summary of Convective Core Vertical Velocity Properties Using...

    Office of Scientific and Technical Information (OSTI)

    Title: Summary of Convective Core Vertical Velocity Properties Using ARM UHF Wind Profilers in Oklahoma Authors: Giangrande S. E. ; Collis, S. ; Straka, J. ; Protat, A. ; Williams, ...

  2. ARM - Field Campaign - ARM Support for the Plains Elevated Convection...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Convection at Night Experiment: Doppler Lidar Operations 2015.06.01, Turner, SGP Comments? ... Lead Scientist : David Turner For data sets, see below. Abstract The Plains Elevated ...

  3. ARM - Midlatitude Continental Convective Clouds Experiment (MC3E...

    Office of Scientific and Technical Information (OSTI)

    Vertical Air Motion (williams-vertair) Title: ARM - Midlatitude Continental Convective Clouds Experiment (MC3E): Multi-Frequency Profilers, Vertical Air Motion (williams-vertair) ...

  4. ARM - Midlatitude Continental Convective Clouds Experiment (MC3E...

    Office of Scientific and Technical Information (OSTI)

    Parcivel Disdrometer (williams-disdro) Title: ARM - Midlatitude Continental Convective Clouds Experiment (MC3E): Multi-Frequency Profilers, Parcivel Disdrometer (williams-disdro) ...

  5. Numerical Modeling Studies of The Dissolution-Diffusion-Convection...

    Office of Scientific and Technical Information (OSTI)

    Numerical Modeling Studies of The Dissolution-Diffusion-Convection ProcessDuring CO2 Storage in Saline Aquifers Citation Details In-Document Search Title: Numerical Modeling ...

  6. ARM - Field Campaign - Deep Convective Clouds and Chemistry

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    govCampaignsDeep Convective Clouds and Chemistry Campaign Links DC3 Experiment Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Campaign : Deep Convective Clouds and Chemistry 2012.05.01 - 2012.06.30 Lead Scientist : Christopher Cantrell Abstract The Deep Convective Clouds and Chemistry (DC3) sought to understand the influence of convection on the upper troposphere which will lead to better understanding of radiative forcing and chemical

  7. Making Sense of Convective Updrafts: Mass Flux and Microphysics

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    model simulations contain a variety of complex dynamical structures that often do not map directly to the structural elements of convective parameterization. An example is...

  8. Interactions between cumulus convection and its environment as...

    Office of Scientific and Technical Information (OSTI)

    Interactions between cumulus convection and its environment as revealed by the MC3E sounding array Citation Details In-Document Search Title: Interactions between cumulus ...

  9. Interactions between cumulus convection and its environment as...

    Office of Scientific and Technical Information (OSTI)

    Journal Article: Interactions between cumulus convection and its environment as revealed by the MC3E sounding array Citation Details In-Document Search Title: Interactions between ...

  10. ARM - Midlatitude Continental Convective Clouds Experiment (MC3E...

    Office of Scientific and Technical Information (OSTI)

    Surface Meteorology (williams-surfmet) Title: ARM - Midlatitude Continental Convective Clouds Experiment (MC3E): Multi-Frequency Profilers, Surface Meteorology (williams-surfmet) ...

  11. Using Cloud-Resolving Model Simulations of Deep Convection to...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    so extending them to a global model with many different environments is not straightforward. For example, deep convection creates abundant cloudiness and yet little is known...

  12. Title: Radar-observed convective characteristics during TWP-ICE

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    will describe the convective systems observed during the project by two scanning C-band Doppler radars, one of which will provide dual-polarization measurements, and ARM's...

  13. Intercomparison of methods of coupling between convection and...

    Office of Scientific and Technical Information (OSTI)

    defined with profiles obtained from the same model in radiative-convective equilibrium. ... a dry troposphere, DGW simulations always result in a precipitating equilibrium state. ...

  14. Optimal Disturbances in Three-Dimensional Natural Convection...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Optimal Disturbances in Three-Dimensional Natural Convection ... Buoyancy-driven systems are subject to several types of flow ... solvers 1 in combination with a power iteration 2. ...

  15. Secretary Chu Visits the 2011 Solar Decathlon | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    1 Solar Decathlon Secretary Chu Visits the 2011 Solar Decathlon September 30, 2011 - 6:27pm Addthis Secretary Chu toured the Solar Village at the 2011 Solar Decathlon on the National Mall's West Potomac Park on September 30, 2011. April Saylor April Saylor Former Digital Outreach Strategist, Office of Public Affairs Earlier today, student Decathletes at the 2011 Solar Decathlon got to show off their homes - and the hard work they've done for the last two years -- to Secretary of Energy Steven

  16. Ambassador Ensher visits Y-12 and NNSS | National Nuclear Security

    National Nuclear Security Administration (NNSA)

    Administration | (NNSA) Ambassador Ensher visits Y-12 and NNSS Monday, April 25, 2016 - 10:30am Stuart Rawlinson, left, of the Nevada National Security Site, explains the layout of the "P" Tunnel complex to Ambassador Henry Ensher, center, Chargé d'Affaires U.S. Mission to International Organizations in Vienna and others. The "P" Tunnel was used during underground nuclear explosive testing, which ended in 1992, by the Defense Threat Reduction Agency to understand the

  17. State and Tribal Government Working Group Visits the Fernald Preserve |

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Department of Energy Fernald Preserve State and Tribal Government Working Group Visits the Fernald Preserve July 12, 2013 - 11:28am Addthis On June 4 and 5, the U.S. Department of Energy (DOE) Office of Legacy Management (LM) hosted the State and Tribal Government Working Group (STGWG) at the Fernald Preserve in Ohio. This group-which receives support from the National Conference of State Legislatures-helps ensure that DOE facilities and sites are operated and cleaned up in compliance with

  18. JLab mourns loss of colleague, visiting scientist Razmik Asaturyan |

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Jefferson Lab (right) and JLab user Glen Warren (University of Basel, Switzerland) prepare to move the Hall C neutron detectors for the Gen experiment after completing assembly and testing. In Memoriam Razmik Asaturyan, 1954 - 2006 CEBAF-Yerevan Collaboration Hall C Visiting Scientist He was only 52 years old. On the evening of 15 June 2006, about 22:30 (10:30 p.m.). I found Razmik on the apartment floor. I called 911 for help. But no one could bring Razmik back. The doctor told us that

  19. Chernobyl after Perestroika: Reflections on a recent visit

    SciTech Connect (OSTI)

    Ausubel, J.H. )

    1992-01-01

    Political change and economic deterioration have drastically affected the handling of the consequences of the Chernobyl nuclear accident. A visit to the site is recounted and five lessons drawn. These are the need for new organizations to manage the decontamination of hazardous waste sites, the limited use of emergency preparedness, the importance of longevity of risks and consequences for environmental management, the need to give international status to sites of major environmental hazards, and the surprises about what prove to be environmentally significant technologies.

  20. The Role of the Tropics in Abrupt Climate Changes

    SciTech Connect (OSTI)

    Fedorov, Alexey

    2013-12-07

    Topics addressed include: abrupt climate changes and ocean circulation in the tropics; what controls the ocean thermal structure in the tropics; a permanent El Niño in paleoclimates; the energetics of the tropical ocean.

  1. Evaluation of Cloud-resolving and Limited Area Model Intercomparison Simulations using TWP-ICE Observations. Part 1: Deep Convective Updraft Properties

    SciTech Connect (OSTI)

    Varble, A. C.; Zipser, Edward J.; Fridlind, Ann; Zhu, Ping; Ackerman, Andrew; Chaboureau, Jean-Pierre; Collis, Scott M.; Fan, Jiwen; Hill, Adrian; Shipway, Ben

    2014-12-27

    Ten 3D cloud-resolving model (CRM) simulations and four 3D limited area model (LAM) simulations of an intense mesoscale convective system observed on January 23-24, 2006 during the Tropical Warm Pool International Cloud Experiment (TWP-ICE) are compared with each other and with observed radar reflectivity fields and dual-Doppler retrievals of vertical wind speeds in an attempt to explain published results showing a high bias in simulated convective radar reflectivity aloft. This high bias results from ice water content being large, which is a product of large, strong convective updrafts, although hydrometeor size distribution assumptions modulate the size of this bias. Snow reflectivity can exceed 40 dBZ in a two-moment scheme when a constant bulk density of 100 kg m-3 is used. Making snow mass more realistically proportional to area rather than volume should somewhat alleviate this problem. Graupel, unlike snow, produces high biased reflectivity in all simulations. This is associated with large amounts of liquid water above the freezing level in updraft cores. Peak vertical velocities in deep convective updrafts are greater than dual-Doppler retrieved values, especially in the upper troposphere. Freezing of large rainwater contents lofted above the freezing level in simulated updraft cores greatly contributes to these excessive upper tropospheric vertical velocities. Strong simulated updraft cores are nearly undiluted, with some showing supercell characteristics. Decreasing horizontal grid spacing from 900 meters to 100 meters weakens strong updrafts, but not enough to match observational retrievals. Therefore, overly intense simulated updrafts may partly be a product of interactions between convective dynamics, parameterized microphysics, and large-scale environmental biases that promote different convective modes and strengths than observed.

  2. International Crops Research Institute for the Semi Arid Tropics...

    Open Energy Info (EERE)

    Crops Research Institute for the Semi Arid Tropics Jump to: navigation, search Name: International Crops Research Institute for the Semi-Arid Tropics Place: India Sector: Biofuels...

  3. Lunty Tropical Fish Aquaculture Low Temperature Geothermal Facility...

    Open Energy Info (EERE)

    Lunty Tropical Fish Aquaculture Low Temperature Geothermal Facility Jump to: navigation, search Name Lunty Tropical Fish Aquaculture Low Temperature Geothermal Facility Facility...

  4. Tropical Cloud Properties and Radiative Heating Profiles (Dataset...

    Office of Scientific and Technical Information (OSTI)

    Tropical Cloud Properties and Radiative Heating Profiles Title: Tropical Cloud Properties ... in that it uses the microwave radiometer to scale the radiosonde column water vapor. ...

  5. Positive low cloud and dust feedbacks amplify tropical North...

    Office of Scientific and Technical Information (OSTI)

    amplify tropical North Atlantic Multidecadal Oscillation: CLOUD AND DUST FEEDBACK AND AMO Title: Positive low cloud and dust feedbacks amplify tropical North Atlantic ...

  6. Characterizing the convective velocity fields in massive stars

    SciTech Connect (OSTI)

    Chatzopoulos, Emmanouil; Graziani, Carlo; Couch, Sean M.

    2014-11-01

    We apply the mathematical formalism of vector spherical harmonics decomposition to convective stellar velocity fields from multidimensional hydrodynamics simulations and show that the resulting power spectra furnish a robust and stable statistical description of stellar convective turbulence. Analysis of the power spectra helps identify key physical parameters of the convective process such as the dominant scale of the turbulent motions that influence the structure of massive evolved pre-supernova stars. We introduce the numerical method that can be used to calculate vector spherical harmonics power spectra from two-dimensional (2D) and three-dimensional (3D) convective shell simulation data. Using this method we study the properties of oxygen shell burning and convection for a 15 M {sub ☉} star simulated by the hydrodynamics code FLASH in 2D and 3D. We discuss the importance of realistic initial conditions to achieving successful core-collapse supernova explosions in multidimensional simulations. We show that the calculated power spectra can be used to generate realizations of the velocity fields of presupernova convective shells. We find that the slope of the solenoidal mode power spectrum remains mostly constant throughout the evolution of convection in the oxygen shell in both 2D and 3D simulations. We also find that the characteristic radial scales of the convective elements are smaller in 3D than in 2D, while the angular scales are larger in 3D.

  7. Interaction of externally-driven acoustic waves with compressible convection

    SciTech Connect (OSTI)

    Jones, P. ); Merryfield, W. . Dept. of Physics and Astronomy); Toomre, J. )

    1992-01-01

    Two-dimensional numerical simulations are used to examine the interaction of acoustic waves with a compressible convecting fluid. Acoustic waves are forced at the lower boundary of the computational domain and propagate through a three-layer system undergoing vigorous penetrative convection. Energy exchange between the wave and the fluid is analyzed using a work integral formulation.

  8. Interaction of externally-driven acoustic waves with compressible convection

    SciTech Connect (OSTI)

    Jones, P.; Merryfield, W.; Toomre, J.

    1992-12-01

    Two-dimensional numerical simulations are used to examine the interaction of acoustic waves with a compressible convecting fluid. Acoustic waves are forced at the lower boundary of the computational domain and propagate through a three-layer system undergoing vigorous penetrative convection. Energy exchange between the wave and the fluid is analyzed using a work integral formulation.

  9. Plains Elevated Convection at Night (PECAN) Experiment Science Plan

    SciTech Connect (OSTI)

    Turner, D; Parsons, D; Geerts, B

    2015-03-01

    The Plains Elevated Convection at Night (PECAN) experiment is a large field campaign that is being supported by the National Science Foundation (NSF) with contributions from the National Oceanic and Atmospheric Administration (NOAA), the National Atmospheric and Space Administration (NASA), and the U.S. Department of Energy (DOE). The overarching goal of the PECAN experiment is to improve the understanding and simulation of the processes that initiate and maintain convection and convective precipitation at night over the central portion of the Great Plains region of the United States (Parsons et al. 2013). These goals are important because (1) a large fraction of the yearly precipitation in the Great Plains comes from nocturnal convection, (2) nocturnal convection in the Great Plains is most often decoupled from the ground and, thus, is forced by other phenomena aloft (e.g., propagating bores, frontal boundaries, low-level jets [LLJ], etc.), (3) there is a relative lack of understanding how these disturbances initiate and maintain nocturnal convection, and (4) this lack of understanding greatly hampers the ability of numerical weather and climate models to simulate nocturnal convection well. This leads to significant uncertainties in predicting the onset, location, frequency, and intensity of convective cloud systems and associated weather hazards over the Great Plains.

  10. Magnetogenesis through convection in barotropic fluids

    SciTech Connect (OSTI)

    Miller, E. Rogers, B.

    2015-04-15

    It is shown that an unmagnetized plasma with non-uniform bulk velocity can generate magnetic fields through consideration of the non-relativistic isentropic two-fluid equations, even when the initial conditions contain with no fields or currents, uniform densities and pressures, and a divergence-free bulk velocity. This effect does not depend on the baroclinicity of the plasma and is therefore relevant even in barotropic flows, where the Biermann battery is absent. It also does not rely on kinetic effects or shear discontinuities. Instead, our magnetogenesis effect arises from convection terms proportional to the electron mass in the generalized Ohm's law. The resulting magnetic fields are typically weak but may still serve as seed fields for dynamo mechanisms.

  11. The impact of vertical shear on the sensitivity of tropical cyclogenesis to environmental rotation and thermodynamic state

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Zhou, Wenyu

    2015-11-19

    Here, the impact of vertical wind shear on the sensitivity of tropical cyclogenesis to environmental rotation and thermodynamic state is investigated through idealized cloud-resolving simulations of the intensification of an incipient vortex. With vertical shear, tropical cyclones intensify faster with a higher Coriolis parameter, f, irrespective of the environmental thermodynamic state. The vertical shear develops a vertically tilted vortex, which undergoes a precession process with the midlevel vortices rotating cyclonically around the surface center. With a higher f, the midlevel vortices are able to rotate continuously against the vertical shear, leading to the realignment of the tilted vortex and rapidmore » intensification. With a lower f, the rotation is too slow such that the midlevel vortices are advected away from the surface center and the intensification is suppressed. The parameter, Χb, measuring the effect from the low-entropy downdraft air on the boundary layer entropy, is found to be a good indicator of the environmental thermodynamic favorability for tropical cyclogenesis in vertical shear. Without vertical shear, tropical cyclones are found to intensify faster with a lower f by previous studies. We show this dependency on f is sensitive to the environmental thermodynamic state. The thermodynamical favorability for convection can be measured by Χm, which estimates the time it takes for surface fluxes to moisten the midtroposphere. A smaller Χm not only leads to a faster intensification due to a shorter period for moist preconditioning of the inner region but also neutralizes the faster intensification with a lower f due to enhanced peripheral convection.« less

  12. The impact of vertical shear on the sensitivity of tropical cyclogenesis to environmental rotation and thermodynamic state

    SciTech Connect (OSTI)

    Zhou, Wenyu

    2015-11-19

    Here, the impact of vertical wind shear on the sensitivity of tropical cyclogenesis to environmental rotation and thermodynamic state is investigated through idealized cloud-resolving simulations of the intensification of an incipient vortex. With vertical shear, tropical cyclones intensify faster with a higher Coriolis parameter, f, irrespective of the environmental thermodynamic state. The vertical shear develops a vertically tilted vortex, which undergoes a precession process with the midlevel vortices rotating cyclonically around the surface center. With a higher f, the midlevel vortices are able to rotate continuously against the vertical shear, leading to the realignment of the tilted vortex and rapid intensification. With a lower f, the rotation is too slow such that the midlevel vortices are advected away from the surface center and the intensification is suppressed. The parameter, Χb, measuring the effect from the low-entropy downdraft air on the boundary layer entropy, is found to be a good indicator of the environmental thermodynamic favorability for tropical cyclogenesis in vertical shear. Without vertical shear, tropical cyclones are found to intensify faster with a lower f by previous studies. We show this dependency on f is sensitive to the environmental thermodynamic state. The thermodynamical favorability for convection can be measured by Χm, which estimates the time it takes for surface fluxes to moisten the midtroposphere. A smaller Χm not only leads to a faster intensification due to a shorter period for moist preconditioning of the inner region but also neutralizes the faster intensification with a lower f due to enhanced peripheral convection.

  13. High-Resolution Modeling to Assess Tropical Cyclone Activity in Future Climate Regimes

    SciTech Connect (OSTI)

    Lackmann, Gary

    2013-06-10

    Applied research is proposed with the following objectives: (i) to determine the most likely level of tropical cyclone intensity and frequency in future climate regimes, (ii) to provide a quantitative measure of uncertainty in these predictions, and (iii) to improve understanding of the linkage between tropical cyclones and the planetary-scale circulation. Current mesoscale weather forecasting models, such as the Weather Research and Forecasting (WRF) model, are capable of simulating the full intensity of tropical cyclones (TC) with realistic structures. However, in order to accurately represent both the primary and secondary circulations in these systems, model simulations must be configured with sufficient resolution to explicitly represent convection (omitting the convective parameterization scheme). Most previous numerical studies of TC activity at seasonal and longer time scales have not utilized such explicit convection (EC) model runs. Here, we propose to employ the moving nest capability of WRF to optimally represent TC activity on a seasonal scale using a downscaling approach. The statistical results of a suite of these high-resolution TC simulations will yield a realistic representation of TC intensity on a seasonal basis, while at the same time allowing analysis of the feedback that TCs exert on the larger-scale climate system. Experiments will be driven with analyzed lateral boundary conditions for several recent Atlantic seasons, spanning a range of activity levels and TC track patterns. Results of the ensemble of WRF simulations will then be compared to analyzed TC data in order to determine the extent to which this modeling setup can reproduce recent levels of TC activity. Next, the boundary conditions (sea-surface temperature, tropopause height, and thermal/moisture profiles) from the recent seasons will be altered in a manner consistent with various future GCM/RCM scenarios, but that preserves the large-scale shear and incipient disturbance

  14. TOMORROW: Secretary Chu to Visit South Carolina to Attend Small Business

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Summit, Highlight Clean Energy Innovations With Rep. Clyburn | Department of Energy TOMORROW: Secretary Chu to Visit South Carolina to Attend Small Business Summit, Highlight Clean Energy Innovations With Rep. Clyburn TOMORROW: Secretary Chu to Visit South Carolina to Attend Small Business Summit, Highlight Clean Energy Innovations With Rep. Clyburn August 22, 2011 - 11:13am Addthis Washington, DC - On Tuesday, August 22, 2011, U.S. Energy Secretary Steven Chu will visit South Carolina to

  15. U.S. and Kazakhstan Strengthen Energy Ties During Secretary Bodman's Visit

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    | Department of Energy Kazakhstan Strengthen Energy Ties During Secretary Bodman's Visit U.S. and Kazakhstan Strengthen Energy Ties During Secretary Bodman's Visit March 14, 2006 - 11:51am Addthis Meets with President Nazarbayev to Discuss Regional Energy Security and Cooperation on Nonproliferation Efforts ASTANA , KAZAKHSTAN - U.S. Secretary of Energy Samuel W. Bodman today continued his four-nation visit in Astana, Kazakhstan. In Astana, the Secretary discussed opportunities for long-term

  16. Visiting senior scientist at Jefferson Lab leads the way on cavity redesign

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    | Jefferson Lab Visiting senior scientist at Jefferson Lab leads the way on cavity redesign Jacek Sekutowicz Jacek Sekutowicz, visiting senior staff scientist at Jefferson Lab's Institute for Superconducting Radiofrequency Science and Technology Visiting senior scientist at Jefferson Lab leads the way on cavity redesign By James Schultz April 23, 2003 Jacek Sekutowicz, one of the world's acknowledged experts in superconducting technology, is helping Jefferson Lab staff design and refine the

  17. Acting NNSA Administrator Bruce Held visits Y-12 National Security Complex

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    | Y-12 National Security Complex Acting NNSA Administrator ... Acting NNSA Administrator Bruce Held visits Y-12 National Security Complex Posted: July 25, 2013 - 6:05pm Acting NNSA Administrator Bruce Held visits Y-12 Bruce Held, Acting NNSA Administrator and Acting Undersecretary for Nuclear Security, visited the Y-12 National Security Complex today. Held toured the site and conducted an All Hands meeting at the site's New Hope Center addressing federal and contractor employees. Held (shown

  18. Y-12 hosts visit from directors of weapons labs | Y-12 National Security

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Complex hosts visit from ... Y-12 hosts visit from directors of weapons labs Posted: October 13, 2014 - 8:44am Assembly/Disassembly Operations Manager Reed Mullins, Y-12 Site Manager Bill Tindal, LLNL Director William Goldstein, LANL Director Charles McMillan, SNL Director Paul Hommert and NNSA Production Office Manager Steve Erhart. Laboratory directors from Sandia National Lab, Lawrence Livermore National Lab and Los Alamos National Lab recently visited the Y-12 National Security Complex.

  19. NNSA administrator visits NNSS to meet team, see national security work |

    National Nuclear Security Administration (NNSA)

    National Nuclear Security Administration | (NNSA) administrator visits NNSS to meet team, see national security work Friday, June 10, 2016 - 2:20pm Last month, Department of Energy Under Secretary for Nuclear Security and NNSA Administrator Lt. Gen. Frank G. Klotz (Ret.) visited NNSA's Nevada Field Office where he hosted an all-hands for NNSA-Nevada staff and presented several service awards. During the trip he visited the NNSA's Remote Sensing Laboratory and Nevada National Security Site

  20. EM's Top Official Visits West Valley Site, Seneca Nation of Indians...

    Broader source: Energy.gov (indexed) [DOE]

    managing the decommissioning of the only commercial spent nuclear fuel reprocessing facility that had operated in the United States during his recent visit to the site. ...

  1. February 5, 2009: Obama visits DoE Headquarters | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    5, 2009: Obama visits DoE Headquarters February 5, 2009: Obama visits DoE Headquarters February 5, 2009: Obama visits DoE Headquarters February 5, 2009 President Obama visits DOE's headquarters at the Forrestal building and in remarks to DOE employees discusses energy and the need for swift passage of the economic recovery plan. "For the last few years, I've talked about [energy] issues with Americans from one end of this country to another," the President tells his audience. "And

  2. DOE Deputy Secretary and Rosatom Director Visit Y-12, Oak Ridge...

    National Nuclear Security Administration (NNSA)

    Home Field Offices Welcome to the NNSA Production Office NPO News Releases DOE Deputy Secretary and Rosatom Director Visit ... DOE Deputy Secretary and Rosatom Director ...

  3. President Obama Visits MIT EFRC | U.S. DOE Office of Science...

    Office of Science (SC) Website

    Obama spoke with Marc Baldo, director of the Center for Excitonics, and EFRC member Vladimir Bulovic about their clean energy research during his visit to MIT External link . ...

  4. Trip report for field visit to Fayetteville Shale gas wells.

    SciTech Connect (OSTI)

    Veil, J. A.; Environmental Science Division

    2007-09-30

    This report describes a visit to several gas well sites in the Fayetteville Shale on August 9, 2007. I met with George Sheffer, Desoto Field Manager for SEECO, Inc. (a large gas producer in Arkansas). We talked in his Conway, Arkansas, office for an hour and a half about the processes and technologies that SEECO uses. We then drove into the field to some of SEECO's properties to see first-hand what the well sites looked like. In 2006, the U.S. Department of Energy's (DOE's) National Energy Technology Laboratory (NETL) made several funding awards under a program called Low Impact Natural Gas and Oil (LINGO). One of the projects that received an award is 'Probabilistic Risk-Based Decision Support for Oil and Gas Exploration and Production Facilities in Sensitive Ecosystems'. The University of Arkansas at Fayetteville has the lead on the project, and Argonne National Laboratory is a partner. The goal of the project is to develop a Web-based decision support tool that will be used by mid- and small-sized oil and gas companies as well as environmental regulators and other stakeholders to proactively minimize adverse ecosystem impacts associated with the recovery of gas reserves in sensitive areas. The project focuses on a large new natural gas field called the Fayetteville Shale. Part of the project involves learning how the natural gas operators do business in the area and the technologies they employ. The field trip on August 9 provided an opportunity to do that.

  5. Free convective condensation in a vertical enclosure

    SciTech Connect (OSTI)

    Fox, R.J.; Peterson, P.F.; Corradini, M.L.; Pernsteiner, A.P.

    1995-09-01

    Free convective condensation in a vertical enclosure was studied numerically and the results were compared with experiments. In both the numerical and experimental investigations, mist formation was observed to occur near the cooling wall, with significant droplet concentrations in the bulk. Large recirculation cells near the end of the condensing section were generated as the heavy noncondensing gas collecting near the cooling wall was accelerated downward. Near the top of the enclosure the recirculation cells became weaker and smaller than those below, ultimately disappearing near the top of the condenser. In the experiment the mist density was seen to be highest near the wall and at the bottom of the condensing section, whereas the numerical model predicted a much more uniform distribution. The model used to describe the formation of mist was based on a Modified Critical Saturation Model (MCSM), which allows mist to be generated once the vapor pressure exceeds a critical value. Equilibrium, nonequilibrium, and MCSM calculations were preformed, showing the experimental results to lie somewhere in between the equilibrium and nonequilibrium predictions of the numerical model. A single adjustable constant (indicating the degree to which equilibrium is achieved) is used in the model in order to match the experimental results.

  6. EVIDENCE FOR CONVECTION IN SUNSPOT PENUMBRAE

    SciTech Connect (OSTI)

    Bharti, L.; Solanki, S. K.; Hirzberger, J.

    2010-10-20

    We present an analysis of twisting motions in penumbral filaments in sunspots located at heliocentric angles from 30{sup 0} to 48{sup 0} using three time series of blue continuum images obtained by the Broadband Filter Imager (BFI) on board Hinode. The relations of the twisting motions to the filament brightness and the position within the filament and within the penumbra, respectively, are investigated. Only certain portions of the filaments show twisting motions. In a statistical sense, the part of the twisting portion of a filament located closest to the umbra is brightest and possesses the fastest twisting motion, with a mean twisting velocity of 2.1 km s{sup -1}. The middle and outer sections of the twisting portion of the filament (lying increasingly further from the umbra), which are less bright, have mean velocities of 1.7 km s{sup -1} and 1.35 km s{sup -1}, respectively. The observed reduction of brightness and twisting velocity toward the outer section of the filaments may be due to reducing upflow along the filament's long axis. No significant variation of twisting velocity as a function of viewing angles was found. The obtained correlation of brightness and velocity suggests that overturning convection causes the twisting motions observed in penumbral filament and may be the source of the energy needed to maintain the brightness of the filaments.

  7. ARM - Midlatitude Continental Convective Clouds Experiment (MC3E...

    Office of Scientific and Technical Information (OSTI)

    S-band Radar (williams-sband) Title: ARM - Midlatitude Continental Convective Clouds Experiment (MC3E): Multi-Frequency Profilers, S-band Radar (williams-sband) This data was ...

  8. ARM - Midlatitude Continental Convective Clouds Experiment (MC3E...

    Office of Scientific and Technical Information (OSTI)

    ...filer(williams-449prof) Title: ARM - Midlatitude Continental Convective Clouds Experiment (MC3E): Multi-Frequency Profilers, 449 MHz Profiler(williams-449prof) This data was ...

  9. NATURAL CONVECTION IN PASSIVE SOLAR BUILDINGS: EXPERIMENTS, ANALYSIS AND RESULTS

    SciTech Connect (OSTI)

    Gadgil, A.; Bauman, F.; Kammerud, R.

    1981-04-01

    Computer programs have been developed to numerically simulate natural convection in two- and three-dimensional room geometries. The programs have been validated using published data from the literature, results from a full-scale experiment performed at the Massachusetts Institute of Technology, and results from a small-scale experiment performed at LBL. One of the computer programs has been used to study the influence of natural convection on the thermal performance of a single zone in a direct-gain passive solar building. It is found that the convective heat transfer coefficients between the air and the enclosure surfaces can be substantially different from the values assumed in the standard building energy analysis methods, and can exhibit significant variations across a given surface. This study implies that the building heating loads calculated by standard building energy analysis methods may have substantial errors as a result of their use of common assumptions regarding the convection processes which occur in an enclosure.

  10. Simple Analysis of Flame Dynamics via Flexible Convected Disturbance...

    Office of Scientific and Technical Information (OSTI)

    Journal Article: Simple Analysis of Flame Dynamics via Flexible Convected Disturbance ... OSTI Identifier: 1160232 Report Number(s): A-NETL-PUB-020 Journal ID: ISSN 0748-4658 ...

  11. Natural convection airflow and heat transport in buildings: experimental results

    SciTech Connect (OSTI)

    Balcomb, J.D.; Jones, G.F.

    1985-01-01

    Observations of natural convection airflow in passive solar buildings are described. Particular results are given for two buildings supplementing other data already published. A number of generalizations based on the monitoring of the 15 buildings are presented. It is concluded that energy can be reasonably well distributed throughout a building by natural convection provided suitable openings are present and that the direction of heat transport is either horizontally across or upward.

  12. Vertical microphysical profiles of convective clouds as a tool for

    Office of Scientific and Technical Information (OSTI)

    obtaining aerosol cloud-mediated climate forcings (Technical Report) | SciTech Connect Vertical microphysical profiles of convective clouds as a tool for obtaining aerosol cloud-mediated climate forcings Citation Details In-Document Search Title: Vertical microphysical profiles of convective clouds as a tool for obtaining aerosol cloud-mediated climate forcings Quantifying the aerosol/cloud-mediated radiative effect at a global scale requires simultaneous satellite retrievals of cloud

  13. Convection feedbacks in a super-parameterization GCM

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Convection feedbacks in a super-parameterization GCM Luo, Zhengzhao (Johnny) Colorado State University Stephens, Graeme Colorado State University Category: Modeling Both the Colorado State University (CSU) and Goddard super-parameterization GCM (SP-GCM) simulate a super-active Asian summer monsoon with unrealistically enhanced levels of precipitation. The underlying physical mechanism for this monsoon bias in the CSU SP-GCM is shown to involve enhanced convection-wind-evaporation feedbacks. The

  14. On the connection between continental-scale land surface processes and the tropical climate in a coupled ocean-atmosphere-land system

    SciTech Connect (OSTI)

    Ma, Hsi-Yen; Mechoso, C. R.; Xue, Yongkang; Xiao, Heng; Neelin, David; Ji, Xuan

    2013-11-15

    The impact of global tropical climate to perturbations in land surface processes (LSP) are evaluated using perturbations given by different LSP representations of continental-scale in a global climate model that includes atmosphere-ocean interactions. One representation is a simple land scheme, which specifies climatological albedos and soil moisture availability. The other representation is the more comprehensive Simplified Simple Biosphere Model, which allows for interactive soil moisture and vegetation biophysical processes. The results demonstrate that LSP processes such as interactive soil moisture and vegetation biophysical processes have strong impacts on the seasonal mean states and seasonal cycles of global precipitation, clouds, and surface air temperature. The impact is especially significant over the tropical Pacific. To explore the mechanisms for such impact, different LSP representations are confined to selected continental-scale regions where strong interactions of climate-vegetation biophysical processes are present. We find that the largest impact is mainly from LSP perturbations over the tropical African continent. The impact is through anomalous convective heating in tropical Africa due to changes in the surface heat fluxes, which in turn affect basinwide teleconnections in the Pacific through equatorial wave dynamics. The modifications in the equatorial Pacific climate are further enhanced by strong air-sea coupling between surface wind stress and upwelling, as well as effect of ocean memory. Our results further suggest that correct representations of land surface processes, land use change and the associated changes in the deep convection over tropical Africa are crucial to reducing the uncertainty when performing future climate projections under different climate change scenarios.

  15. Natural convection heat transfer within horizontal spent nuclear fuel assemblies

    SciTech Connect (OSTI)

    Canaan, R.E.

    1995-12-01

    Natural convection heat transfer is experimentally investigated in an enclosed horizontal rod bundle, which characterizes a spent nuclear fuel assembly during dry storage and/or transport conditions. The basic test section consists of a square array of sixty-four stainless steel tubular heaters enclosed within a water-cooled rectangular copper heat exchanger. The heaters are supplied with a uniform power generation per unit length while the surrounding enclosure is maintained at a uniform temperature. The test section resides within a vacuum/pressure chamber in order to subject the assembly to a range of pressure statepoints and various backfill gases. The objective of this experimental study is to obtain convection correlations which can be used in order to easily incorporate convective effects into analytical models of horizontal spent fuel systems, and also to investigate the physical nature of natural convection in enclosed horizontal rod bundles in general. The resulting data consist of: (1) measured temperatures within the assembly as a function of power, pressure, and backfill gas; (2) the relative radiative contribution for the range of observed temperatures; (3) correlations of convective Nusselt number and Rayleigh number for the rod bundle as a whole; and (4) correlations of convective Nusselt number as a function of Rayleigh number for individual rods within the array.

  16. Remotely operated excavator needs assessment/site visit summary

    SciTech Connect (OSTI)

    Straub, J.; Haller, S.; Worsley, R.; King, M.

    1992-12-02

    The Uranium in Soils Integrated Demonstration requested an assessment of soil excavation needs relative to soil remediation. The following list identifies the DOE sites assessed: Mound Laboratory, Paducah Gaseous Diffusion Plant, Portsmouth Gaseous Diffusion Plant, Nevada Test Site, Lawrence Livermore National Laboratory, Rocky Flats Plant, Los Alamos National Laboratory, Sandia National Laboratory, Idaho National Engineering Laboratory, Hanford Site, and Fernald Site. The reviewed sites fall into one or more of the following three categories: production, EPA National Priorities List, or CERCLA (superfund) designation. Only three of the sites appear to have the need for a remotely operated excavator rope. Hanford and Idaho Falls have areas of high-level radioactive contamination either buried or in/under buildings. The Fernald site has a need for remote operated equipment of different types. It is their feeling that remote equipment can be used to remove the health dangers to humans by removing them from the area. Most interviewees stated that characterization technologies needs are more immediate concern over excavation. In addition, the sites do not have similar geographic conditions which would aid in the development of a generic precision excavator. The sites visited were not ready to utilize or provide the required design information necessary to draft a performance specification. This creates a strong case against the development of one type of ROPE for use at these sites. Assuming soil characterization technology/methodology is improved sufficiently to allow accurate and real time field characterization then development of a precision excavator might be pursued based on FEMP needs, since the FEMP`s sole scope of work is remediation. The excavator could then be used/tested and then later modified for other sites as warranted.

  17. Visualizations, Screen Shots, and Data Input Files from VisIT

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    VisIt is a free interactive parallel visualization and graphical analysis tool for viewing scientific data on Unix and PC platforms. Users can quickly generate visualizations from their data, animate them through time, manipulate them, and save the resulting images for presentations. VisIt contains a rich set of visualization features so that you can view your data in a variety of ways. It can be used to visualize scalar and vector fields defined on two- and three-dimensional (2D and 3D) structured and unstructured meshes. VisIt was designed to handle very large data set sizes in the terascale range and yet can also handle small data sets in the kilobyte range. The VisIT website provides a gallery of vizualizations, another set of screen shots, and allows downloads of data files for input and source codes and executables for the VisIT software suite.

  18. Tuberous legumes: preliminary evaluation of tropical Australian and introduced species as fuel crops

    SciTech Connect (OSTI)

    Saxon, E.C.

    1981-04-01

    The evaluation of native and introduced legumes with starch-storing roots or tubers was undertaken to test whether plants traditionally collected as food by Australian aborigines might have a role in the development of crops for liquid fuel production (by fermentation of carbohydrates to ethanol). Tuberous-rooted legumes from overseas were planted at the Commonwealth Scientific and Industrial Research Organization, division of Tropical Crops and Pastures, Kimberley Research Station, Western Australia (15/sup 0/39'S, 128/sup 0/42'E) in December 1974, March 1978 and February 1979. Roots from the latter plantings were harvested in June 1979. Native plant material was collected during visits to aboriginal communities in the Kimberleys between April and June 1979. The native and introduced specimens were analyzed for fermentable carbohydrate and protein content. Several native plants appear more promising than introduced species as liquid fuel crops.

  19. Quantifying Diurnal Cloud Radiative Effects by Cloud Type in the Tropical Western Pacific

    SciTech Connect (OSTI)

    Burleyson, Casey D.; Long, Charles N.; Comstock, Jennifer M.

    2015-06-01

    Cloud radiative effects are examined using long-term datasets collected at the three Department of Energy (DOE) Atmospheric Radiation Measurement (ARM) Climate Research Facilities in the tropical western Pacific. We quantify the surface radiation budget, cloud populations, and cloud radiative effects by partitioning the data by cloud type, time of day, and as a function of large scale modes of variability such as El Niño Southern Oscillation (ENSO) phase and wet/dry seasons at Darwin. The novel facet of our analysis is that we break aggregate cloud radiative effects down by cloud type across the diurnal cycle. The Nauru cloud populations and subsequently the surface radiation budget are strongly impacted by ENSO variability whereas the cloud populations over Manus only shift slightly in response to changes in ENSO phase. The Darwin site exhibits large seasonal monsoon related variations. We show that while deeper convective clouds have a strong conditional influence on the radiation reaching the surface, their limited frequency reduces their aggregate radiative impact. The largest source of shortwave cloud radiative effects at all three sites comes from low clouds. We use the observations to demonstrate that potential model biases in the amplitude of the diurnal cycle and mean cloud frequency would lead to larger errors in the surface energy budget compared to biases in the timing of the diurnal cycle of cloud frequency. Our results provide solid benchmarks to evaluate model simulations of cloud radiative effects in the tropics.

  20. Tropical BioEnergia SA | Open Energy Information

    Open Energy Info (EERE)

    BioEnergia SA Jump to: navigation, search Name: Tropical BioEnergia SA Place: Edeia, Goias, Brazil Product: Tropical BioEnergia SA is a joint venture which will build and operate...

  1. Benefits of Tropical Forest Management Under the New Climate...

    Open Energy Info (EERE)

    of Tropical Forest Management Under the New Climate Change Agreement-A Case Study in Cambodia Jump to: navigation, search Name Benefits of Tropical Forest Management Under the New...

  2. Coordinated Airborne Studies in the Tropics (CAST) Field Campaign...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    ... National Aeronautics and Space Administration National ... Tropical Warm Pool - International Cloud Experiment United ... Daily meteorological measurments from the Momote station. ...

  3. Chu Visits Site of America's First New Nuclear Reactor in Three Decades |

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Department of Energy Chu Visits Site of America's First New Nuclear Reactor in Three Decades Chu Visits Site of America's First New Nuclear Reactor in Three Decades February 15, 2012 - 2:12pm Addthis Just two days after the Department of Energy requested more than $770 million for nuclear energy in 2013, U.S. Secretary of Energy Steven Chu visited the Vogtle nuclear power plant in Waynesboro, Georgia and Oak Ridge National Laboratory to highlight the steps the Obama Administration is taking

  4. U.S. Energy Secretary Bodman Visits U.A.E. | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Bodman Visits U.A.E. U.S. Energy Secretary Bodman Visits U.A.E. November 12, 2005 - 2:24pm Addthis ABU DHABI, U.A.E. -Secretary of Energy Samuel W. Bodman today visited the United Arab Emirates (U.A.E.), the first stop in his four-nation swing through the Middle East. Secretary Bodman expressed his gratitude, on behalf of the United States, to the U.A.E. for their support and contributions to those affected by the hurricanes that hit the Gulf of Mexico region earlier this year, and their

  5. Energy Secretary Moniz and Export-Import Bank Chairman Hochberg to Visit

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    First Solar Facility in Perrysburg, Ohio | Department of Energy Secretary Moniz and Export-Import Bank Chairman Hochberg to Visit First Solar Facility in Perrysburg, Ohio Energy Secretary Moniz and Export-Import Bank Chairman Hochberg to Visit First Solar Facility in Perrysburg, Ohio February 14, 2015 - 6:35pm Addthis News Media Contact 202 586 4940 RSVP@hq.doe.gov Energy Secretary Moniz and Export-Import Bank Chairman Hochberg to Visit First Solar Facility in Perrysburg, Ohio WASHINGTON- On

  6. June 2-4, 2015: Los Alamos Visit | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    2-4, 2015: Los Alamos Visit June 2-4, 2015: Los Alamos Visit June 2-4, 2015 The joint DOE/NPS team meets in Los Alamos for the last of the three site visits. The group is briefed at the Los Alamos National Laboratory's Bradbury Science Museum and tours the lab's Manhattan Project properties. The team does a walking tour of the town site and has several opportunities to meet with community groups and leaders. An open house is held at the historic Fuller Lodge. DOE/NPS team briefed at the Romero

  7. Chu Visits Site of America's First New Nuclear Reactor in Three Decades |

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Department of Energy Chu Visits Site of America's First New Nuclear Reactor in Three Decades Chu Visits Site of America's First New Nuclear Reactor in Three Decades February 15, 2012 - 12:40pm Addthis WASHINGTON, D.C. - Just two days after the Department of Energy requested more than $770 million for nuclear energy in 2013, U.S. Secretary of Energy Steven Chu visited the Vogtle nuclear power plant in Waynesboro, Georgia and Oak Ridge National Laboratory to highlight the steps the Obama

  8. A simulation of convective dynamo in the solar convective envelope: Maintenance of the solar-like differential rotation and emerging flux

    SciTech Connect (OSTI)

    Fan, Yuhong; Fang, Fang

    2014-07-01

    We report the results of a magnetohydrodynamic (MHD) simulation of a convective dynamo in a model solar convective envelope driven by the solar radiative diffusive heat flux. The convective dynamo produces a large-scale mean magnetic field that exhibits irregular cyclic behavior with oscillation time scales ranging from about 5 to 15 yr and undergoes irregular polarity reversals. The mean axisymmetric toroidal magnetic field is of opposite signs in the two hemispheres and is concentrated at the bottom of the convection zone. The presence of the magnetic fields is found to play an important role in the self-consistent maintenance of a solar-like differential rotation in the convective dynamo model. Without the magnetic fields, the convective flows drive a differential rotation with a faster rotating polar region. In the midst of magneto-convection, we found the emergence of strong super-equipartition flux bundles at the surface, exhibiting properties that are similar to emerging solar active regions.

  9. ARM - Midlatitude Continental Convective Clouds (comstock-hvps)

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Jensen, Mike; Comstock, Jennifer; Genio, Anthony Del; Giangrande, Scott; Kollias, Pavlos

    Convective processes play a critical role in the Earth's energy balance through the redistribution of heat and moisture in the atmosphere and their link to the hydrological cycle. Accurate representation of convective processes in numerical models is vital towards improving current and future simulations of Earths climate system. Despite improvements in computing power, current operational weather and global climate models are unable to resolve the natural temporal and spatial scales important to convective processes and therefore must turn to parameterization schemes to represent these processes. In turn, parameterization schemes in cloud-resolving models need to be evaluated for their generality and application to a variety of atmospheric conditions. Data from field campaigns with appropriate forcing descriptors have been traditionally used by modelers for evaluating and improving parameterization schemes.

  10. ARM - Midlatitude Continental Convective Clouds (comstock-hvps)

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Jensen, Mike; Comstock, Jennifer; Genio, Anthony Del; Giangrande, Scott; Kollias, Pavlos

    2012-01-06

    Convective processes play a critical role in the Earth's energy balance through the redistribution of heat and moisture in the atmosphere and their link to the hydrological cycle. Accurate representation of convective processes in numerical models is vital towards improving current and future simulations of Earths climate system. Despite improvements in computing power, current operational weather and global climate models are unable to resolve the natural temporal and spatial scales important to convective processes and therefore must turn to parameterization schemes to represent these processes. In turn, parameterization schemes in cloud-resolving models need to be evaluated for their generality and application to a variety of atmospheric conditions. Data from field campaigns with appropriate forcing descriptors have been traditionally used by modelers for evaluating and improving parameterization schemes.

  11. Turbulent natural and mixed convection along a vertical plate

    SciTech Connect (OSTI)

    Abu-Mulaweh, H.I.; Armaly, B.F.; Chen, T.S.; Zhao, J.Z.

    1997-07-01

    Measurements of turbulent boundary-layer air flow in natural and mixed convection adjacent to an isothermal vertical flat plate are reported. Laser-Doppler velocimeter and cold wire anemometer were used, respectively, to measure simultaneously the mean turbulent velocity and temperature distributions were measured for a temperature difference, {Delta}T, of 30 C between the heated wall and the free stream air at a fixed location x = 3 m (with a corresponding Grashof number Gr{sub x} = 8.55 x 10{sup 10}), and for a range of free stream velocities 0 m/s {le} U{sub {infinity} } {le} 0.41 m/s. The effect of small free stream velocity on the turbulent natural convection is examined. These results reveal that the introduction of small free stream velocity on turbulent natural convection flow suppresses turbulence and decreases the heat transfer rate from the heated wall.

  12. ARM - Field Campaign - CROC - Convective Radio Occultations Campaign

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    govCampaignsCROC - Convective Radio Occultations Campaign ARM Data Discovery Browse Data Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Campaign : CROC - Convective Radio Occultations Campaign 2012.02.01 - 2014.12.31 Lead Scientist : Riccardo Biondi For data sets, see below. Abstract This campaign acquired in situ measurements (cloud base, cloud top, profiles of backscatter, temperature and water vapor) co-located with the Global Positioning

  13. ARM - Field Campaign - Midlatitude Continental Convective Clouds Experiment

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    (MC3E): Multi-Frequency Profilers Experiment (MC3E): Multi-Frequency Profilers ARM Data Discovery Browse Data Related Campaigns Midlatitude Continental Convective Clouds Experiment (MC3E) 2011.04.22, Jensen, SGP Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Campaign : Midlatitude Continental Convective Clouds Experiment (MC3E): Multi-Frequency Profilers 2011.04.22 - 2011.06.06 Lead Scientist : Christopher Williams For data sets, see below.

  14. Midlatitude Continental Convective Clouds Experiment (MC3E)

    SciTech Connect (OSTI)

    Jensen, MP; Petersen, WA; Del Genio, AD; Giangrande, SE; Heymsfield, A; Heymsfield, G; Hou, AY; Kollias, P; Orr, B; Rutledge, SA; Schwaller, MR; Zipser, E

    2010-04-01

    Convective processes play a critical role in the Earths energy balance through the redistribution of heat and moisture in the atmosphere and subsequent impacts on the hydrologic cycle. Global observation and accurate representation of these processes in numerical models is vital to improving our current understanding and future simulations of Earths climate system. Despite improvements in computing power, current operational weather and global climate models are unable to resolve the natural temporal and spatial scales that are associated with convective and stratiform precipitation processes; therefore, they must turn to parameterization schemes to represent these processes. In turn, the physical basis for these parameterization schemes needs to be evaluated for general application under a variety of atmospheric conditions. Analogously, space-based remote sensing algorithms designed to retrieve related cloud and precipitation information for use in hydrological, climate, and numerical weather prediction applications often rely on physical parameterizations that reliably translate indirectly related instrument measurements to the physical quantity of interest (e.g., precipitation rate). Importantly, both spaceborne retrieval algorithms and model convective parameterization schemes traditionally rely on field campaign data sets as a basis for evaluating and improving the physics of their respective approaches. The Midlatitude Continental Convective Clouds Experiment (MC3E) will take place in central Oklahoma during the AprilMay 2011 period. The experiment is a collaborative effort between the U.S. Department of Energy (DOE) Atmospheric Radiation Measurement (ARM) Climate Research Facility and the National Aeronautics and Space Administrations (NASA) Global Precipitation Measurement (GPM) mission Ground Validation (GV) program. The field campaign leverages the unprecedented observing infrastructure currently available in the central United States, combined with

  15. A meshless method for modeling convective heat transfer

    SciTech Connect (OSTI)

    Carrington, David B

    2010-01-01

    A meshless method is used in a projection-based approach to solve the primitive equations for fluid flow with heat transfer. The method is easy to implement in a MATLAB format. Radial basis functions are used to solve two benchmark test cases: natural convection in a square enclosure and flow with forced convection over a backward facing step. The results are compared with two popular and widely used commercial codes: COMSOL, a finite element model, and FLUENT, a finite volume-based model.

  16. Climate Science: Tropical Expansion by Ocean Swing

    SciTech Connect (OSTI)

    Lu, Jian

    2014-04-01

    The tropical belt has become wider over the past decades, but climate models fall short of capturing the full rate of the expansion. The latest analysis of the climate simulations suggests that a long-term swing of the Pacific Decadal Oscillation is the main missing cause.

  17. Statement from Deputy Secretary of Energy Elizabeth Sherwood-Randall after Visiting the Fukushima Dai-ichi Nuclear Power Station

    Broader source: Energy.gov [DOE]

    Deputy Secretary Elizabeth Sherwood-Randall's statement after visiting the Fukushima Dai-ichi Nuclear Power Station in Japan

  18. Clifton Truman Daniel's visit to Oak Ridge and Y-12, part 1

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    called me several weeks ago to state that he had initiated contact with President Harry S. Truman's grandson and that he was anxious to visit Oak Ridge. That was exciting...

  19. U.S. Energy Secretary Visits Saudi Arabia | Department of Energy

    Energy Savers [EERE]

    Meeting with Minister Al-Naimi, tour of Shaybah oil field, and kick-off of International ... headquarters and visiting Aramco's Shaybah oil field. "Consumers of energy and producers ...

  20. Oregon Senator Jeff Merkley to Visit Surprise Valley Electrification Corp. Project Site

    Broader source: Energy.gov [DOE]

    Senator Jeff Merkley of Oregon will be stopping by our ARRA Low-Temperature project, Surprise Valley Electrification Corp., this Sunday, August 28, 2011, for a brief site visit.

  1. Chu Visits Site of America's First New Nuclear Reactor in Three...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    energy in 2013, U.S. Secretary of Energy Steven Chu visited the Vogtle nuclear power plant in Waynesboro, Georgia and Oak Ridge National Laboratory to highlight the steps the...

  2. Head of EM Visits Waste Isolation Pilot Plant for First Underground...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Head of EM Visits Waste Isolation Pilot Plant for First Underground Tour Since February Incidents October 16, 2014 - 12:00pm Addthis CBFO Manager Joe Franco, left, and EM Acting ...

  3. EM Officials Visit Four New Mexico Pueblos, Meet with Tribal Leadership

    Broader source: Energy.gov [DOE]

    LOS ALAMOS, N.M. – EM officials recently traveled to four pueblos in New Mexico to visit with Tribal leaders, demonstrating DOE’s commitment to maintaining its government-to-government relations with the Tribes.

  4. DOE’s Chief Information Officer Visits Savannah River National Laboratory

    Broader source: Energy.gov [DOE]

    AIKEN, S.C. – DOE Chief Information Officer (CIO) Michael Johnson joined several other Department officials this month for a visit to Savannah River National Laboratory, EM’s only national laboratory.

  5. Energy Secretary Moniz visits Y-12 | Y-12 National Security Complex

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Secretary Moniz ... Energy Secretary Moniz visits Y-12 Posted: June 5, 2013 - 2:49pm Secretary of Energy Ernest Moniz (at right) tours the Highly Enriched Uranium Materials ...

  6. THURSDAY: Deputy Secretary of Energy to Visit Western Area Power Administration Transmission Substation

    Broader source: Energy.gov [DOE]

    Deputy Secretary of Energy Elizabeth Sherwood-Randall will visit the Western Area Power Administration for a ceremony at the Electrical District No. 5 Substation to view progress on the Electrical District 5-to-Palo Verde transmission project.

  7. Klotz visits Y-12 to see progress on new projects and ongoing...

    National Nuclear Security Administration (NNSA)

    Klotz visits Y-12 to see progress on new projects and ongoing work on NNSA's national security missions Tuesday, June 7, 2016 - 11:48am Last week, NNSA Administrator Lt. Gen. Frank ...

  8. Nuclear Energy Advisory Committee Facility Subcommittee visit to Oak Ridge National Laboratory

    Broader source: Energy.gov [DOE]

    The NEAC Facilities Subcommittee made a site visit to Oak Ridge National Laboratory (ORNL) on August 26, 2010. Subcommittee members included John Ahearne (Vice Chairman of NEAC and Facilities...

  9. Top U.S. Energy Department Official Visits Iowa, Calls on Congress to

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Extend Clean Energy Tax Credits | Department of Energy Energy Department Official Visits Iowa, Calls on Congress to Extend Clean Energy Tax Credits Top U.S. Energy Department Official Visits Iowa, Calls on Congress to Extend Clean Energy Tax Credits July 25, 2012 - 2:42pm Addthis News Media Contact (202) 586-4940 WASHINGTON - Today, Under Secretary for Energy (Acting) and Assistant Secretary for Policy & International Affairs, David Sandalow traveled to Iowa to highlight President

  10. Energy Secretary Chu to Visit Delphi Power Electronics Plant in Kokomo

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Indiana | Department of Energy Visit Delphi Power Electronics Plant in Kokomo Indiana Energy Secretary Chu to Visit Delphi Power Electronics Plant in Kokomo Indiana July 14, 2010 - 12:00am Addthis Washington D.C. - On Friday, July 16, Energy Secretary Steven Chu will travel to Kokomo, Indiana to tour Delphi Automotive Systems manufacturing plant with Mayor Greg Goodnight. Remarks will be given following the tour. The trip is part of a nationwide initiative led by President Obama and members

  11. Klotz visits Y-12 to see progress on new projects and ongoing work on

    National Nuclear Security Administration (NNSA)

    NNSA's national security missions | National Nuclear Security Administration | (NNSA) Klotz visits Y-12 to see progress on new projects and ongoing work on NNSA's national security missions Tuesday, June 7, 2016 - 11:48am Last week, NNSA Administrator Lt. Gen. Frank Klotz (Ret.) visited the Y-12 National Security Complex to check on the status of ongoing projects like the Uranium Processing Facility as well as the site's continuing uranium operations. He also met with the Region 2 volunteers

  12. Air Force general visits Pantex, Y-12 | Y-12 National Security Complex

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    News / Air Force general visits ... Air Force general visits Pantex, Y-12 Posted: August 29, 2016 - 10:40am Brig. Gen. Mike Lutton (center) tours Y 12's Beta-2E with (from left) Abe Mathews, former NNSA Principal Deputy Administrator for Military Applications Brig. Gen. Stephen L. Davis, Rick Collier of the NNSA Production Office and CNS Deputy Enterprise Manager Michelle Reichert. Air Force Brig. Gen. Michael Lutton formally took position as the National Nuclear Security Administration's new

  13. VisIt: An End-User Tool for Visualizing and Analyzing Very Large Data

    SciTech Connect (OSTI)

    Childs, Hank; Brugger, Eric; Whitlock, Brad; Meredith, Jeremy; Ahern, Sean; Pugmire, David; Biagas, Kathleen; Miller, Mark; Weber, Gunther H.; Krishnan, Hari; Fogal, Thomas; Sanderson, Allen; Garth, Christoph; Bethel, E. Wes; Camp, David; Ruebel, Oliver; Durant, Marc; Favre, Jean; Navratil, Paul

    2012-11-01

    VisIt is a popular open source tool for visualizing and analyzing big data. It owes its success to its foci of increasing data understanding, large data support, and providing a robust and usable product, as well as its underlying design that fits today's supercomputing landscape. This report, which draws heavily from an earlier publication at the SciDAC Conference in 2011 describes the VisIt project and its accomplishments.

  14. TUESDAY: Energy Secretary Moniz to Visit Los Alamos and Sandia National

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Laboratories in New Mexico with Senator Udall, Senator Heinrich, and Representative Lujan | Department of Energy TUESDAY: Energy Secretary Moniz to Visit Los Alamos and Sandia National Laboratories in New Mexico with Senator Udall, Senator Heinrich, and Representative Lujan TUESDAY: Energy Secretary Moniz to Visit Los Alamos and Sandia National Laboratories in New Mexico with Senator Udall, Senator Heinrich, and Representative Lujan August 29, 2013 - 4:35pm Addthis NEWS MEDIA CONTACT (202)

  15. U.S. Energy Secretary Will Visit Indiana to Highlight Investments in Clean

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Commercial Vehicles and the American Workforce | Department of Energy Will Visit Indiana to Highlight Investments in Clean Commercial Vehicles and the American Workforce U.S. Energy Secretary Will Visit Indiana to Highlight Investments in Clean Commercial Vehicles and the American Workforce March 2, 2012 - 2:29pm Addthis WASHINGTON, D.C. - On Monday, March, 5, U.S. Secretary of Energy Secretary Steven Chu will deliver the keynote address at the Green Truck Summit at the Indiana Convention

  16. Unclassified Foreign National Visits and Assignments at Oak Ridge National Laboratory

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Unclassified Foreign National Visits and Assignments at Oak Ridge National Laboratory INS-O-13-05 September 2013 Department of Energy Washington, DC 20585 September 16, 2013 MEMORANDUM FOR THE MANAGER, OAK RIDGE NATIONAL LABORATORY SITE OFFICE FROM: Sandra D. Bruce Assistant Inspector General for Inspections Office of Inspector General SUBJECT: INFORMATION: Inspection Report on "Unclassified Foreign National Visits and Assignments at Oak Ridge National Laboratory" BACKGROUND In support

  17. 2-D and 3-D Models of Convective Turbulence and Oscillations...

    Office of Scientific and Technical Information (OSTI)

    2-D and 3-D Models of Convective Turbulence and Oscillations in Intermediate-Mass Main-Sequence Stars Citation Details In-Document Search Title: 2-D and 3-D Models of Convective ...

  18. ON THE VIGOR OF MANTLE CONVECTION IN SUPER-EARTHS

    SciTech Connect (OSTI)

    Miyagoshi, Takehiro; Tachinami, Chihiro; Kameyama, Masanori; Ogawa, Masaki E-mail: ctchnm.geo@gmail.com E-mail: cmaogawa@mail.ecc.u-tokyo.ac.jp

    2014-01-01

    Numerical models are presented to clarify how adiabatic compression affects thermal convection in the mantle of super-Earths tentimes the Earth's mass. The viscosity strongly depends on temperature, and the Rayleigh number is much higher than that of the Earth's mantle. The strong effect of adiabatic compression reduces the activity of mantle convection; hot plumes ascending from the bottom of the mantle lose their thermal buoyancy in the middle of the mantle owing to adiabatic decompression, and do not reach the surface. A thick lithosphere, as thick as 0.1times the depth of the mantle, develops along the surface boundary, and the efficiency of convective heat transport measured by the Nusselt number is reduced by a factor of about four compared with the Nusselt number for thermal convection of incompressible fluid. The strong effect of adiabatic decompression is likely to inhibit hot spot volcanism on the surface and is also likely to affect the thermal history of the mantle, and hence, the generation of magnetic field in super-Earths.

  19. Convection venting lensed reflector-type compact fluorescent lamp system

    DOE Patents [OSTI]

    Pelton, B.A.; Siminovitch, M.

    1997-07-29

    Disclosed herein is a fluorescent lamp housing assembly capable of providing convection cooling to the lamp and the ballast. The lens of the present invention includes two distinct portions, a central portion and an apertured portion. The housing assembly further includes apertures so that air mass is able to freely move up through the assembly and out ventilation apertures. 12 figs.

  20. Convection venting lensed reflector-type compact fluorescent lamp system

    DOE Patents [OSTI]

    Pelton, Bruce A.; Siminovitch, Michael

    1997-01-01

    Disclosed herein is a fluorescent lamp housing assembly capable of providing convection cooling to the lamp and the ballast. The lens of the present invention includes two distinct portions, a central portion and an apertured portion. The housing assembly further includes apertures so that air mass is able to freely move up through the assembly and out ventilation apertures.

  1. Two-phase convective CO2 dissolution in saline aquifers

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Martinez, Mario J.; Hesse, Marc A.

    2016-01-01

    Geologic carbon storage in deep saline aquifers is a promising technology for reducing anthropogenic emissions into the atmosphere. Dissolution of injected CO2 into resident brines is one of the primary trapping mechanisms generally considered necessary to provide long-term storage security. Given that diffusion of CO2 in brine is woefully slow, convective dissolution, driven by a small increase in brine density with CO2 saturation, is considered to be the primary mechanism of dissolution trapping. Previous studies of convective dissolution have typically only considered the convective process in the single-phase region below the capillary transition zone and have either ignored the overlyingmore » two-phase region where dissolution actually takes place or replaced it with a virtual region with reduced or enhanced constant permeability. Our objective is to improve estimates of the long-term dissolution flux of CO2 into brine by including the capillary transition zone in two-phase model simulations. In the fully two-phase model, there is a capillary transition zone above the brine-saturated region over which the brine saturation decreases with increasing elevation. Our two-phase simulations show that the dissolution flux obtained by assuming a brine-saturated, single-phase porous region with a closed upper boundary is recovered in the limit of vanishing entry pressure and capillary transition zone. For typical finite entry pressures and capillary transition zone, however, convection currents penetrate into the two-phase region. As a result, this removes the mass transfer limitation of the diffusive boundary layer and enhances the convective dissolution flux of CO2 more than 3 times above the rate assuming single-phase conditions.« less

  2. Thermodynamic properties of mesoscale convective systems observed during BAMEX

    SciTech Connect (OSTI)

    Correia, James; Arritt, R.

    2008-11-01

    Dropsonde observations from the Bow-echo and Mesoscale convective vortex EXperiment (BAMEX) are used to document the spatio-temporal variability of temperature, moisture and wind within mesoscale convective systems (MCSs). Onion type sounding structures are found throughout the stratiform region of MCSs but the temperature and moisture variability is large. Composite soundings were constructed and statistics of thermodynamic variability were generated within each sub-region of the MCS. The calculated air vertical velocity helped identify subsaturated downdrafts. We found that lapse rates within the cold pool varied markedly throughout the MCS. Layered wet bulb potential temperature profiles seem to indicate that air within the lowest several km comes from a variety of source regions. We also found that lapse rate transitions across the 0 C level were more common than isothermal, melting layers. We discuss the implications these findings have and how they can be used to validate future high resolution numerical simulations of MCSs.

  3. Influence of geometry on natural convection in buildings

    SciTech Connect (OSTI)

    White, M.D.; Winn, C.B.; Jones, G.F.; Balcomb, J.D.

    1985-01-01

    Strong free convection airflows occur within passive solar buildings resulting from elevated temperatures of surfaces irradiated by solar energy compared with the cooler surfaces not receiving radiation. The geometry of a building has a large influence on the directions and magnitudes of natural airflows, and thus heat transfer between zones. This investigation has utilized a variety of reduced-scale building configurations to study the effects of geometry on natural convection heat transfer. Similarity between the reduced-scale model and a full-scale passive solar building is achieved by having similar geometries and by replacing air with Freon-12 gas as the model's working fluid. Filling the model with Freon-12 gas results in similarity in Prandtl numbers and Rayleigh numbers based on temperature differences in the range from 10/sup 9/ to 10/sup 11/. Results from four geometries are described with an emphasis placed on the effects of heat loss on zone temperature stratification shifts.

  4. FULLY CONVECTIVE MAGNETOROTATIONAL TURBULENCE IN STRATIFIED SHEARING BOXES

    SciTech Connect (OSTI)

    Bodo, G.; Rossi, P.; Cattaneo, F.; Mignone, A.

    2013-07-10

    We present a numerical study of turbulence and dynamo action in stratified shearing boxes with zero magnetic flux. We assume that the fluid obeys the perfect gas law and has finite (constant) thermal diffusivity. We choose radiative boundary conditions at the vertical boundaries in which the heat flux is proportional to the fourth power of the temperature. We compare the results with the corresponding cases in which fixed temperature boundary conditions are applied. The most notable result is that the formation of a fully convective state in which the density is nearly constant as a function of height and the heat is transported to the upper and lower boundaries by overturning motions is robust and persists even in cases with radiative boundary conditions. Interestingly, in the convective regime, although the diffusive transport is negligible, the mean stratification does not relax to an adiabatic state.

  5. Laminar mixed convection in a horizontal eccentric annulus

    SciTech Connect (OSTI)

    Choudhury, D. ); Karki, K. )

    1992-01-01

    Laminar fluid flow and heat transfer phenomena in cylindrical annuli are encountered in various applications. The purpose of this paper is to present a numerical study of laminar mixed convection in horizontal eccentric annuli. Axial flow and heat transfer in a horizontal cylindrical annulus can be influenced by eccentricity of the inner cylinder and the presence of buoyancy forces. A numerical study is presented for the combined forced and free convection for the fully developed flow and heat transfer to eccentric annuli of different eccentricities and radius ratios. The flow field is characterized by large cross-stream secondary currents and significant flow distortion. The Nusselt number increases significantly with the Rayleigh number; the corresponding increase in the friction factor is relatively small. The eccentricity introduces additional nonuniformity of the flow and temperature fields.

  6. Numerical study of thermoacoustic convection in a cavity

    SciTech Connect (OSTI)

    Fusegi, Toru; Farouk, B.; Oran, E.S.

    1995-12-31

    Thermoacoustic convection in a two-dimensional cavity is numerically studied. Part of a compressible fluid (Helium) near the center line of the cavity is suddenly energized to generate pressure waves. Numerical solutions are secured by employing a highly accurate explicit method termed LCPFCT algorithm for the convection terms of the full Navier-Stokes equations. Thermoacoustic waves, which decay in large time due to the viscosity of fluid, are of the oscillatory nature. Much higher heat transfer rate can be achieved in an initial stage of transient processes, compared to that due to conduction. When a partial length of the cavity center line is heated, resulting thermoacoustic waves exhibit remarkable two-dimensional patterns.

  7. Midlatitude Continental Convective Clouds Experiment (MC3E)

    SciTech Connect (OSTI)

    Jensen, MP; Petersen, WA; Del Genio, AD; Giangrande, SE; Heymsfield, A; Heymsfield, G; Hou, AY; Kollias, P; Orr, B; Rutledge, SA; Schwaller, MR; Zipser, E

    2010-04-10

    The Midlatitude Continental Convective Clouds Experiment (MC3E) will take place in central Oklahoma during the AprilMay 2011 period. The experiment is a collaborative effort between the U.S. Department of Energy (DOE) Atmospheric Radiation Measurement (ARM) Climate Research Facility and the National Aeronautics and Space Administrations (NASA) Global Precipitation Measurement (GPM) mission Ground Validation (GV) program. The field campaign leverages the unprecedented observing infrastructure currently available in the central United States, combined with an extensive sounding array, remote sensing and in situ aircraft observations, NASA GPM ground validation remote sensors, and new ARM instrumentation purchased with American Recovery and Reinvestment Act funding. The overarching goal is to provide the most complete characterization of convective cloud systems, precipitation, and the environment that has ever been obtained, providing constraints for model cumulus parameterizations and space-based rainfall retrieval algorithms over land that have never before been available.

  8. Natural convection burnout heat flux limit for control rods

    SciTech Connect (OSTI)

    Britt, T.E.

    1986-04-14

    Technical Standard 105-3.05, Safety Circuits, does not require the Septifoil Supply Header Pressure Very Low safety circuit for current charges. This document develops a new requirement for this circuit based on the burnout heat flux of a control rod under natural convective cooling. Specifically, the Septifoil Supply Header Pressure Very Low safety circuit will be required whenever the calculated control rod operating heat flux exceeds 155,000 pcu/ft{sup 2}-hr.

  9. ARM - Midlatitude Continental Convective Clouds Experiment (MC3E)

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Related Links MC3E Home News News & Press MC3E Backgrounder (PDF, 1.61MB) SGP Images ARM flickr site Field Blog ARM Data Discovery Browse Data Deployment Operations Measurements Science Plan (PDF, 3.85 MB) Featured Data Plots SGP Data Plots (all) Experiment Planning Steering Committee Science Questions MC3E Proposal Abstract and Related Campaigns Meetings Cloud Life Cycle Working Group Contacts Michael Jensen, Lead Scientist Midlatitude Continental Convective Clouds Experiment (MC3E) Thanks

  10. The Tropical Warm Pool International Cloud Experiment: Overview

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    The Tropical Warm Pool International Cloud Experiment: Overview May, Peter Bureau or Meteorology Research Centre Mather, James Pacific Northwest National Laboratory Jakob,...

  11. A Decade of Atmospheric Research in the Tropical Western Pacific...

    Office of Science (SC) Website

    cloud systems in climate models, long-term measurements of tropical clouds, the environment in which they reside, and their impact on radiation and water budgets are needed. ...

  12. Radiative Energy Balance in the Tropical Tropopause Layer: An...

    Office of Scientific and Technical Information (OSTI)

    tropical cirrus clouds from the CALIPSO satellite and from ground-based micropulse and Raman lidar observations; (v) improving the parameterization of optical properties of cirrus ...

  13. Clarence Strait Tidal Energy Project, Tenax Energy Tropical Tidal...

    Open Energy Info (EERE)

    Clarence Strait Tidal Energy Project, Tenax Energy Tropical Tidal Test Centre, Jump to: navigation, search 1 Retrieved from "http:en.openei.orgwindex.php?titleClarenceStrai...

  14. Ocean Barrier Layers Effect on Tropical Cyclone Intensification

    SciTech Connect (OSTI)

    Balaguru, Karthik; Chang, P.; Saravanan, R.; Leung, Lai-Yung R.; Xu, Zhao; Li, M.; Hsieh, J.

    2012-09-04

    Improving a tropical cyclone's forecast and mitigating its destructive potential requires knowledge of various environmental factors that influence the cyclone's path and intensity. Herein, using a combination of observations and model simulations, we systematically demonstrate that tropical cyclone intensification is significantly affected by salinity-induced barrier layers, which are 'quasi-permanent' features in the upper tropical oceans. When tropical cyclones pass over regions with barrier layers, the increased stratification and stability within the layer reduce storm-induced vertical mixing and sea surface temperature cooling. This causes an increase in enthalpy flux from the ocean to the atmosphere and, consequently, an intensification of tropical cyclones. On average, the tropical cyclone intensification rate is nearly 50% higher over regions with barrier layers, compared to regions without. Our finding, which underscores the importance of observing not only the upper-ocean thermal structure but also the salinity structure in deep tropical barrier layer regions, may be a key to more skillful predictions of tropical cyclone intensities through improved ocean state estimates and simulations of barrier layer processes. As the hydrological cycle responds to global warming, any associated changes in the barrier layer distribution must be considered in projecting future tropical cyclone activity.

  15. Differences Between Tropical and Trade-Wind Shallow Cumuli

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Differences Between Tropical and Trade-Wind Shallow Cumuli For original submission and image(s), see ARM Research Highlights http:www.arm.govsciencehighlights Research...

  16. U.S. Energy Secretary Chu and Deputy Secretary Poneman to Visit Wisconsin,

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Texas to Call for Extension of Clean Energy Tax Credits | Department of Energy Chu and Deputy Secretary Poneman to Visit Wisconsin, Texas to Call for Extension of Clean Energy Tax Credits U.S. Energy Secretary Chu and Deputy Secretary Poneman to Visit Wisconsin, Texas to Call for Extension of Clean Energy Tax Credits July 12, 2012 - 9:46am Addthis NEWS MEDIA CONTACT (202) 586-4940 WASHINGTON - Tomorrow, July 12, 2012, U.S. Secretary of Energy Steven Chu and Deputy Secretary of Energy Daniel

  17. Simulation Analysis of Inspections of International Travelers at Los Angeles International Airport for US-VISIT

    SciTech Connect (OSTI)

    Edmunds, T; Sholl, P; Yao, Y; Gansemer, J; Cantwell, E; Prosnitz, D; Rosenberg, P; Norton, G

    2004-02-11

    The United States Visitor and Immigrant Status Indicator Technology Program (US-VISIT) will deploy biometric and other systems to identify and track foreign nationals entering and exiting the U.S. Evaluation of the large number of possible policy options and technical configurations for implementation of US-VISIT requires validated system analyses with appropriate tools that can address the requirements of this new program and its processes. Early identification of performance issues and capability gaps will prove critical to the success of the program.

  18. Chu Visits Site of America�s First New Nuclear Reactor in Three Decades

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    5, 2012 Chu Visits Site of America�s First New Nuclear Reactor in Three Decades Energy Secretary Announces New Nuclear Energy Research Grants and Next Steps on Used Fuel Recommendations WASHINGTON, D.C. � Just two days after the Department of Energy requested more than $770 million for nuclear energy in 2013, U.S. Secretary of Energy Steven Chu visited the Vogtle nuclear power plant in Waynesboro, Georgia and Oak Ridge National Laboratory to highlight the steps the Obama Administration is

  19. Medal of Honor recipient Colonel Bruce Crandall visits Y-12 | Y-12 National

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Security Complex recipient ... Medal of Honor recipient Colonel Bruce Crandall visits Y-12 Posted: November 14, 2012 - 4:00pm Medal of Honor recipient Colonel Bruce Crandall visits Y-12 One of 80 living Medal of Honor recipients, Crandall was in East Tennessee to promote the school program Character Counts. The Oak Ridge-Knoxville area will also host the 2014 Medal of Honor Convention. Awarded the nation's highest award for military valor, Crandall flew more than 900 combat missions during

  20. DOE Deputy Secretary and Rosatom Director Visit Y-12, Oak Ridge National

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Laboratory During First Meeting of U.S.-Russian Nuclear Energy and Nuclear Security Working Group | Department of Energy Deputy Secretary and Rosatom Director Visit Y-12, Oak Ridge National Laboratory During First Meeting of U.S.-Russian Nuclear Energy and Nuclear Security Working Group DOE Deputy Secretary and Rosatom Director Visit Y-12, Oak Ridge National Laboratory During First Meeting of U.S.-Russian Nuclear Energy and Nuclear Security Working Group September 29, 2009 - 12:00am Addthis

  1. Smithsonian Associates Study Tour visits Y-12 | Y-12 National Security

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Complex Smithsonian Associates ... Smithsonian Associates Study Tour visits Y-12 Posted: November 2, 2015 - 6:06pm The Smithsonian Associates Study Tour visited the Y-12 History Center. This year marks the second year that the Smithsonian Institute has featured an Oak Ridge tour for its annual Associates Study Tour. Forty-three teachers and two tour leaders travelled from Washington, D.C., to Oak Ridge for the three-day workshop packed with history and filled with new technological advances

  2. AERIAL MEASUREMENTS OF CONVECTION CELL ELEMENTS IN HEATED LAKES

    SciTech Connect (OSTI)

    Villa-Aleman, E; Saleem Salaymeh, S; Timothy Brown, T; Alfred Garrett, A; Malcolm Pendergast, M; Linda Nichols, L

    2007-12-19

    Power plant-heated lakes are characterized by a temperature gradient in the thermal plume originating at the discharge of the power plant and terminating at the water intake. The maximum water temperature discharged by the power plant into the lake depends on the power generated at the facility and environmental regulations on the temperature of the lake. Besides the observed thermal plume, cloud-like thermal cells (convection cell elements) are also observed on the water surface. The size, shape and temperature of the convection cell elements depends on several parameters such as the lake water temperature, wind speed, surfactants and the depth of the thermocline. The Savannah River National Laboratory (SRNL) and Clemson University are collaborating to determine the applicability of laboratory empirical correlations between surface heat flux and thermal convection intensity. Laboratory experiments at Clemson University have demonstrated a simple relationship between the surface heat flux and the standard deviation of temperature fluctuations. Similar results were observed in the aerial thermal imagery SRNL collected at different locations along the thermal plume and at different elevations. SRNL will present evidence that the results at Clemson University are applicable to cooling lakes.

  3. Appendix B: Site Visit Reports. Assessment of Research Needs for Coal Utilization

    SciTech Connect (OSTI)

    Penner, S.S.

    1983-05-01

    This section contains edited copies of site-visit and other reports prepared by CCAWG members. Some of the hand-out materials prepared by DOE contractors and others are included (without explication) to permit readers the construction of a coherent picture of work in progress.

  4. Chinese Delegation Meets with EM Officials in its First Visit to Savannah River Site

    Broader source: Energy.gov [DOE]

    AIKEN, S.C. – A delegation from two nuclear-related entities in China visited the Savannah River Site (SRS) for the first time last month, and its members agreed with EM officials to discuss potential areas of collaboration in waste treatment and disposal and to establish collaborative technology projects.

  5. Head of EM Visits Waste Isolation Pilot Plant for First Underground Tour Since February Incidents

    Broader source: Energy.gov [DOE]

    CARLBAD, N.M. – EM Acting Assistant Secretary Mark Whitney today visited the Waste Isolation Pilot Plant (WIPP) near Carlsbad, N.M., where he became the first non-WIPP employee to tour the underground facility since a truck fire and unrelated radiological release temporarily closed the facility in February.

  6. Secretary Chu, EM’s Huizenga and Other DOE Officials Visit Catholic University's Laboratory

    Broader source: Energy.gov [DOE]

    WASHINGTON, D.C. – Dave Huizenga, head of the Department of Energy (DOE) Office of Environmental Management (EM), was part of a DOE delegation led by Secretary of Energy Steven Chu that visited Catholic University’s Vitreous State Laboratory (VSL) this week.

  7. The impact of vertical shear on the sensitivity of tropical cyclogenes...

    Office of Scientific and Technical Information (OSTI)

    The impact of vertical shear on the sensitivity of tropical cyclogenesis to environmental rotation and thermodynamic state: TROPICAL CYCLOGENESIS AND SHEAR Citation Details ...

  8. Visit CD

    ScienceCinema (OSTI)

    None

    2011-04-25

    Le DG H.Schopper souhaite la bienvenue aux ambassadeurs des pays membres et aux représentants des pays avec lesquels le Cern entretient des relations proches et fait un exposé sur les activités au Cern

  9. SOUND-SPEED INVERSION OF THE SUN USING A NONLOCAL STATISTICAL CONVECTION THEORY

    SciTech Connect (OSTI)

    Zhang Chunguang; Deng Licai; Xiong Darun; Christensen-Dalsgaard, Jorgen

    2012-11-01

    Helioseismic inversions reveal a major discrepancy in sound speed between the Sun and the standard solar model just below the base of the solar convection zone. We demonstrate that this discrepancy is caused by the inherent shortcomings of the local mixing-length theory adopted in the standard solar model. Using a self-consistent nonlocal convection theory, we construct an envelope model of the Sun for sound-speed inversion. Our solar model has a very smooth transition from the convective envelope to the radiative interior, and the convective energy flux changes sign crossing the boundaries of the convection zone. It shows evident improvement over the standard solar model, with a significant reduction in the discrepancy in sound speed between the Sun and local convection models.

  10. Comparisons Of Two- And Three-Dimensional Convection In Type I X-Ray Bursts

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Zingale, M.; Malone, C. M.; Nonaka, A.; Almgren, A. S.; Bell, J. B.

    2015-07-01

    We perform the first detailed three-dimensional simulation of low Mach number convection preceding runaway thermonuclear ignition in a mixed H/He X-ray burst. Our simulations include a moderate-sized, approximate network that captures hydrogen and helium burning up through rp-process breakout. We look at the difference between two- and three-dimensional convective fields, including the details of the turbulent convection.

  11. The Midlatitude Continental Convective Clouds Experiment (MC3E)

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Jensen, M. P.; Petersen, W. A.; Bansemer, A.; Bharadwaj, N.; Carey, L. D.; Cecil, D. J.; Collis, S. M.; DelGenio, A. D.; Dolan, B.; Gerlach, J.; et al

    2015-12-18

    The Midlatitude Continental Convective Clouds Experiment (MC3E), a field program jointly led by the U.S. Department of Energy’s Atmospheric Radiation Measurement program and the NASA Global Precipitation Measurement (GPM) Mission, was conducted in south-central Oklahoma during April – May 2011. MC3E science objectives were motivated by the need to improve understanding of midlatitude continental convective cloud system lifecycles, microphysics, and GPM precipitation retrieval algorithms. To achieve these objectives a multi-scale surface- and aircraft-based in situ and remote sensing observing strategy was employed. A variety of cloud and precipitation events were sampled during the MC3E, of which results from three deepmore » convective events are highlighted. Vertical structure, air motions, precipitation drop-size distributions and ice properties were retrieved from multi-wavelength radar, profiler, and aircraft observations for an MCS on 11 May. Aircraft observations for another MCS observed on 20 May were used to test agreement between observed radar reflectivities and those calculated with forward-modeled reflectivity and microwave brightness temperatures using in situ particle size distributions and ice water content. Multi-platform observations of a supercell that occurred on 23 May allowed for an integrated analysis of kinematic and microphysical interactions. A core updraft of 25 ms-1 supported growth of hail and large rain drops. As a result, data collected during the MC3E campaign is being used in a number of current and ongoing research projects and is available through the DOE ARM and NASA data archives.« less

  12. The Midlatitude Continental Convective Clouds Experiment (MC3E)

    SciTech Connect (OSTI)

    Jensen, M. P.; Petersen, W. A.; Bansemer, A.; Bharadwaj, N.; Carey, L. D.; Cecil, D. J.; Collis, S. M.; DelGenio, A. D.; Dolan, B.; Gerlach, J.; Giangrande, S. E.; Heymsfield, A.; Heymsfield, G.; Kollias, P.; Lang, T. J.; Nesbitt, S. W.; Neumann, A.; Poellot, M.; Rutledge, S. A.; Schwaller, M.; Tokay, A.; Williams, C. R.; Wolff, D. B.; Xie, S.; Zipser, E. J.

    2015-12-18

    The Midlatitude Continental Convective Clouds Experiment (MC3E), a field program jointly led by the U.S. Department of Energy’s Atmospheric Radiation Measurement program and the NASA Global Precipitation Measurement (GPM) Mission, was conducted in south-central Oklahoma during April – May 2011. MC3E science objectives were motivated by the need to improve understanding of midlatitude continental convective cloud system lifecycles, microphysics, and GPM precipitation retrieval algorithms. To achieve these objectives a multi-scale surface- and aircraft-based in situ and remote sensing observing strategy was employed. A variety of cloud and precipitation events were sampled during the MC3E, of which results from three deep convective events are highlighted. Vertical structure, air motions, precipitation drop-size distributions and ice properties were retrieved from multi-wavelength radar, profiler, and aircraft observations for an MCS on 11 May. Aircraft observations for another MCS observed on 20 May were used to test agreement between observed radar reflectivities and those calculated with forward-modeled reflectivity and microwave brightness temperatures using in situ particle size distributions and ice water content. Multi-platform observations of a supercell that occurred on 23 May allowed for an integrated analysis of kinematic and microphysical interactions. A core updraft of 25 ms-1 supported growth of hail and large rain drops. As a result, data collected during the MC3E campaign is being used in a number of current and ongoing research projects and is available through the DOE ARM and NASA data archives.

  13. Water Vapor Turbulence Profiles in Stationary Continental Convective Mixed Layers

    SciTech Connect (OSTI)

    Turner, D. D.; Wulfmeyer, Volker; Berg, Larry K.; Schween, Jan

    2014-10-08

    The U.S. Department of Energy Atmospheric Radiation Measurement (ARM) program’s Raman lidar at the ARM Southern Great Plains (SGP) site in north-central Oklahoma has collected water vapor mixing ratio (q) profile data more than 90% of the time since October 2004. Three hundred (300) cases were identified where the convective boundary layer was quasi-stationary and well-mixed for a 2-hour period, and q mean, variance, third order moment, and skewness profiles were derived from the 10-s, 75-m resolution data. These cases span the entire calendar year, and demonstrate that the q variance profiles at the mixed layer (ML) top changes seasonally, but is more related to the gradient of q across the interfacial layer. The q variance at the top of the ML shows only weak correlations (r < 0.3) with sensible heat flux, Deardorff convective velocity scale, and turbulence kinetic energy measured at the surface. The median q skewness profile is most negative at 0.85 zi, zero at approximately zi, and positive above zi, where zi is the depth of the convective ML. The spread in the q skewness profiles is smallest between 0.95 zi and zi. The q skewness at altitudes between 0.6 zi and 1.2 zi is correlated with the magnitude of the q variance at zi, with increasingly negative values of skewness observed lower down in the ML as the variance at zi increases, suggesting that in cases with larger variance at zi there is deeper penetration of the warm, dry free tropospheric air into the ML.

  14. ARM Support for the Plains Elevated Convection at Night (AS-PECAN...

    Office of Scientific and Technical Information (OSTI)

    winds modulate bore structure, the role of these disturbances in the initiation, maintenance, and organization of deep convection, and their impact on the LLJ and SBL. *The LLJ ...

  15. THE DOMINANCE OF NEUTRINO-DRIVEN CONVECTION IN CORE-COLLAPSE...

    Office of Scientific and Technical Information (OSTI)

    Third, buoyant driving is balanced by turbulent dissipation. Fourth, the convective ... Country of Publication: United States Language: English Subject: 79 ASTROPHYSICS, ...

  16. The Mid-latitude Continental Convective Clouds (MC3E) Experiment...

    Office of Scientific and Technical Information (OSTI)

    Program Document: The Mid-latitude Continental Convective Clouds (MC3E) Experiment Final Campaign Report Citation Details In-Document Search Title: The Mid-latitude Continental ...

  17. Tropical Cloud Properties and Radiative Heating Profiles

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Mather, James

    We have generated a suite of products that includes merged soundings, cloud microphysics, and radiative fluxes and heating profiles. The cloud microphysics is strongly based on the ARM Microbase value added product (Miller et al., 2003). We have made a few changes to the microbase parameterizations to address issues we observed in our initial analysis of the tropical data. The merged sounding product is not directly related to the product developed by ARM but is similar in that it uses the microwave radiometer to scale the radiosonde column water vapor. The radiative fluxes also differ from the ARM BBHRP (Broadband Heating Rate Profile) product in terms of the radiative transfer model and the sampling interval.

  18. Tropical Cloud Properties and Radiative Heating Profiles

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Mather, James

    2008-01-15

    We have generated a suite of products that includes merged soundings, cloud microphysics, and radiative fluxes and heating profiles. The cloud microphysics is strongly based on the ARM Microbase value added product (Miller et al., 2003). We have made a few changes to the microbase parameterizations to address issues we observed in our initial analysis of the tropical data. The merged sounding product is not directly related to the product developed by ARM but is similar in that it uses the microwave radiometer to scale the radiosonde column water vapor. The radiative fluxes also differ from the ARM BBHRP (Broadband Heating Rate Profile) product in terms of the radiative transfer model and the sampling interval.

  19. US-VISIT Identity Matching Algorithm Evaluation Program: ADIS Algorithm Evaluation Project Plan Update

    SciTech Connect (OSTI)

    Grant, C W; Lenderman, J S; Gansemer, J D

    2011-02-24

    This document is an update to the 'ADIS Algorithm Evaluation Project Plan' specified in the Statement of Work for the US-VISIT Identity Matching Algorithm Evaluation Program, as deliverable II.D.1. The original plan was delivered in August 2010. This document modifies the plan to reflect modified deliverables reflecting delays in obtaining a database refresh. This document describes the revised schedule of the program deliverables. The detailed description of the processes used, the statistical analysis processes and the results of the statistical analysis will be described fully in the program deliverables. The US-VISIT Identity Matching Algorithm Evaluation Program is work performed by Lawrence Livermore National Laboratory (LLNL) under IAA HSHQVT-07-X-00002 P00004 from the Department of Homeland Security (DHS).

  20. A tropical influence on global climate

    SciTech Connect (OSTI)

    Schneider, E.K.; Kirtman, B.P.; Lindzen, R.S.

    1997-05-15

    A potential influence of tropical sea surface temperature on the global climate response to a doubling of the CO{sub 2} concentration is tested using an atmospheric general circulation model coupled to a slab mixed layer ocean. The warming is significantly reduced when sea surface temperatures in the eastern equatorial Pacific cold tongue region between latitudes 2.25{degrees}N and 2.25{degrees}S are held at the control simulation values. Warming of the global mean temperature outside of the cold tongue region is reduced from 2.4{degrees}C in the unconstrained case to 1.9{degrees}C when the sea surface temperature constraint is applied. The decrease in the warming results from a positive net heat flux into the ocean cold tongue region and implicit heat storage in the subsurface ocean, induced by horizontal atmospheric heat fluxes. The reduced surface temperature warming outside of the cold tongue region is due to reduction in the downward longwave radiative flux at the surface, caused in turn by reduced atmospheric temperature and moisture. The global mean surface temperature responds to the heat storage in the ocean as if the global mean radiative forcing due to the doubled CO{sub 2} (approximately 4 W m{sup {minus}2}) was reduced by the value of the global mean heat flux into the ocean. This mechanism also provides a possible explanation for the observed high correlation on interannual timescales between the global mean tropospheric temperature and sea surface temperature in the eastern tropical Pacific. The results emphasize the importance of correctly modeling the dynamical processes in the ocean and atmosphere that help determine the sea surface temperature in the equatorial eastern Pacific, in addition to the thermodynamical processes, in projecting global warming. 23 refs., 8 figs.

  1. The Mechanism of First Raindrops Formation in Deep Convective Clouds

    SciTech Connect (OSTI)

    Khain, Alexander; Prabha, Thara; Benmoshe, Nir; Pandithurai, G.; Ovchinnikov, Mikhail

    2013-08-22

    The formation of first raindrops in deep convective clouds is investigated. A combination of observational data analysis and 2-D and 3-D numerical bin microphysical simulations of deep convective clouds suggests that the first raindrops form at the top of undiluted or slightly diluted cores. It is shown that droplet size distributions in these regions are wider and contain more large droplets than in diluted volumes. The results of the study indicate that the initial raindrop formation is determined by the basic microphysical processes within ascending adiabatic volumes. It allows one to predict the height of the formation of first raindrops considering the processes of nucleation, diffusion growth and collisions. The results obtained in the study explain observational results reported by Freud and Rosenfeld (2012) according to which the height of first raindrop formation depends linearly on the droplet number concentration at cloud base. The results also explain why a simple adiabatic parcel model can reproduce this dependence. The present study provides a physical basis for retrieval algorithms of cloud microphysical properties and aerosol properties using satellites proposed by Rosenfeld et al. ( 2012). The study indicates that the role of mixing and entrainment in the formation of the first raindrops is not of crucial importance. It is also shown that low variability of effective and mean volume radii along horizontal traverses, as regularly observed by in situ measurements, can be simulated by high-resolution cloud models, in which mixing is parameterized by a traditional 1.5 order turbulence closure scheme.

  2. Hydra-TH Extensions for Multispecies and Thermosolutal Convection

    SciTech Connect (OSTI)

    Stagg, Alan K

    2015-09-01

    This report describes the Consortium for Advanced Simulation of Light Water Reactors (CASL) work conducted for completion of the Thermal Hydraulics Methods (THM) Level 3 Milestone THM.CFD.P11.02: Hydra-TH Extensions for Multispecies and Thermosolutal Convection. A critical requirement for modeling reactor thermal hydraulics is to account for species transport within the fluid. In particular, this capability is needed for modeling transport and diffusion of boric acid within water for emergency, reactivity-control scenarios. To support this need, a species transport capability has been implemented in Hydra-TH for binary systems (for example, solute within a solvent). A species transport equation is solved for the species (solute) mass fraction, and both thermal and solutal buoyancy effects are handled with specification of a Boussinesq body force. Species boundary conditions can be specified with a Dirichlet condition on mass fraction or a Neumann condition on diffusion flux. To enable enhanced species/fluid mixing in turbulent flow, the molecular diffusivity for the binary system is augmented with a turbulent diffusivity in the species transport calculation. The new capabilities are demonstrated by comparison of Hydra-TH calculations to the analytic solution for a thermosolutal convection problem, and excellent agreement is obtained.

  3. ARM - Midlatitude Continental Convective Clouds (jensen-sonde)

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Jensen, Mike; Comstock, Jennifer; Genio, Anthony Del; Giangrande, Scott; Kollias, Pavlos

    2012-01-19

    A major component of the Mid-latitude Continental Convective Clouds Experiment (MC3E) field campaign was the deployment of an enhanced radiosonde array designed to capture the vertical profile of atmospheric state variables (pressure, temperature, humidity wind speed and wind direction) for the purpose of deriving the large-scale forcing for use in modeling studies. The radiosonde array included six sites (enhanced Central Facility [CF-1] plus five new sites) launching radiosondes at 3-6 hour sampling intervals. The network will cover an area of approximately (300)2 km2 with five outer sounding launch sites and one central launch location. The five outer sounding launch sites are: S01 Pratt, KS [ 37.7oN, 98.75oW]; S02 Chanute, KS [37.674, 95.488]; S03 Vici, Oklahoma [36.071, -99.204]; S04 Morris, Oklahoma [35.687, -95.856]; and S05 Purcell, Oklahoma [34.985, -97.522]. Soundings from the SGP Central Facility during MC3E can be retrieved from the regular ARM archive. During routine MC3E operations 4 radiosondes were launched from each of these sites (approx. 0130, 0730, 1330 and 1930 UTC). On days that were forecast to be convective up to four additional launches were launched at each site (approx. 0430, 1030, 1630, 2230 UTC). There were a total of approximately 14 of these high frequency launch days over the course of the experiment.

  4. Convection causes enhanced magnetic turbulence in accretion disks in outburst

    SciTech Connect (OSTI)

    Hirose, Shigenobu; Blaes, Omer; Coleman, Matthew S. B.; Krolik, Julian H.; Sano, Takayoshi

    2014-05-20

    We present the results of local, vertically stratified, radiation magnetohydrodynamic (MHD) shearing box simulations of magneto-rotational instability (MRI) turbulence appropriate for the hydrogen ionizing regime of dwarf nova and soft X-ray transient outbursts. We incorporate the frequency-integrated opacities and equation of state for this regime, but neglect non-ideal MHD effects and surface irradiation, and do not impose net vertical magnetic flux. We find two stable thermal equilibrium tracks in the effective temperature versus surface mass density plane, in qualitative agreement with the S-curve picture of the standard disk instability model. We find that the large opacity at temperatures near 10{sup 4} K, a corollary of the hydrogen ionization transition, triggers strong, intermittent thermal convection on the upper stable branch. This convection strengthens the magnetic turbulent dynamo and greatly enhances the time-averaged value of the stress to thermal pressure ratio ?, possibly by generating vertical magnetic field that may seed the axisymmetric MRI, and by increasing cooling so that the pressure does not rise in proportion to the turbulent dissipation. These enhanced stress to pressure ratios may alleviate the order of magnitude discrepancy between the ?-values observationally inferred in the outburst state and those that have been measured from previous local numerical simulations of magnetorotational turbulence that lack net vertical magnetic flux.

  5. Special session: computational predictability of natural convection flows in enclosures

    SciTech Connect (OSTI)

    Christon, M A; Gresho, P M; Sutton, S B

    2000-08-14

    Modern thermal design practices often rely on a ''predictive'' simulation capability--although predictability is rarely quantified and often difficult to confidently achieve in practice. The computational predictability of natural convection in enclosures is a significant issue for many industrial thermal design problems. One example of this is the design for mitigation of optical distortion due to buoyancy-driven flow in large-scale laser systems. In many instances the sensitivity of buoyancy-driven enclosure flows can be linked to the presence of multiple bifurcation points that yield laminar thermal convective processes that transition from steady to various modes of unsteady flow. This behavior is brought to light by a problem as ''simple'' as a differentially-heated tall rectangular cavity (8:1 height/width aspect ratio) filled with a Boussinesq fluid with Pr = 0.71--which defines, at least partially, the focus of this special session. For our purposes, the differentially-heated cavity provides a virtual fluid dynamics laboratory.

  6. DOE/NNSA visits Mumbai in support of India's Global Center for Nuclear

    National Nuclear Security Administration (NNSA)

    Energy Partnership | National Nuclear Security Administration | (NNSA) visits Mumbai in support of India's Global Center for Nuclear Energy Partnership Friday, August 21, 2015 - 12:00am On August 4 - 6, 2015, representatives from DOE/NNSA's Office of Defense Nuclear Nonproliferation (DNN) traveled to Mumbai, India, for meetings of the Joint Working Group (JWG), in support of India's Global Centre for Nuclear Energy Partnership (GCNEP). The GCNEP will be India's world-class national nuclear

  7. Secretary Chu Visits Advanced Battery Plant in Michigan, Announces New Army

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Partnership | Department of Energy Advanced Battery Plant in Michigan, Announces New Army Partnership Secretary Chu Visits Advanced Battery Plant in Michigan, Announces New Army Partnership July 18, 2011 - 1:09pm Addthis Secretary Chu speaks at the A123 Systems lithium-ion battery manufacturing plant in Romulus, Michigan, while employees look on. | Photo Courtesy of Damien LaVera, Energy Department Secretary Chu speaks at the A123 Systems lithium-ion battery manufacturing plant in Romulus,

  8. October 30, 2008, Visiting Speakers Program - Dow Chemicals Presentation - Dows Approach to Sustainability

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Catalyst for Change Dow's Approach to Sustainability Dr. Susan Butts Sr. Director, External Science & Technology Programs The Dow Chemical Company Office of Health, Safety & Security Visiting Speaker Program US Department of Energy The Power of the Human Element At The Dow Chemical Company, we view chemistry as the work of humanity. We believe the most important element of all is not found on the periodic table, yet is part of every equation for the future. This element is the Human

  9. I T E L I N E S S Secretary Bodman Visits Las Vegas

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Secretary Bodman Visits Las Vegas 1 NTS Receives First Out-of-state MLLW 3 Stephen Okosisi Goes Beyond the Call 4 Homeland Security course features guest speakers 5 Additional Security Guards Join WSI 5 Magnet Campaign Spurs Safer Drivers 6 Amchitka Marine Environment Safe 8 NNSA Works Cooperatively to Tackle Security Threats 9 Occupational Medicine Discusses Skin Cancer 10 Milestones 11 Calendar 12 In This Issue Above: Secretary Bodman toured a variety of key landmarks at the NTS, including the

  10. Microsoft Word - Trident Orientation for Visiting Experimenters rev 12-13.docx

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Orientation for Visiting Experimenters This training is a general orientation for workers in the Trident Target areas. In addition, all workers must be authorized for any medium or high hazard activities by following and signing the Trident Target Area Operations IWD Name: ___________________________________________ Z no. ________ Organization: _________________________ Tel: _________ Date: ________ I am authorized to perform the following tasks at LANL: ______ Operate and align class 3b & 4

  11. From Theory to Reality: Visit to NREL Heightens Student's Desire to Become an Engineer

    Broader source: Energy.gov [DOE]

    As a student at New Mexico State University majoring in electrical engineering technology with a minor in renewable energy technology, I want to help my community by incorporating renewable energy technology so power will be distributed to every home, business, or school at an affordable cost to both my community and the electrical company. Visiting the NREL facility not only heightened my desire to become an engineer but also to see my goals come to fruition.

  12. July 24, 2009, Visiting Speakers Program - Regulation and High Reliability Organizations by Dr. Jerry Ellig

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Regulation and High Reliability Organizations Jerry Ellig Senior Research Fellow Prepared for the U.S. Department of Energy Office of Health, Safety, and Security Visiting Speakers Program National Academy of Public Administration July 24, 2009 High Reliability Organizations � "Avoid catastrophes in high-risk, complex operating environments ... consistently deliver year-in/year-out high value and high performance regardless of their operating environment." � Key principle: Reality

  13. Natural Convection and Boiling for Cooling SRP Reactors During Loss of Circulation Conditions

    SciTech Connect (OSTI)

    Buckner, M.R.

    2001-06-26

    This study investigated natural convection and boiling as a means of cooling SRP reactors in the event of a loss of circulation accident. These studies show that single phase natural convection cooling of SRP reactors in shutdown conditions with the present piping geometry is probably not feasible.

  14. A shallow convection parameterization for the non-hydrostatic MM5 mesoscale model

    SciTech Connect (OSTI)

    Seaman, N.L.; Kain, J.S.; Deng, A.

    1996-04-01

    A shallow convection parameterization suitable for the Pennsylvannia State University (PSU)/National Center for Atmospheric Research nonhydrostatic mesoscale model (MM5) is being developed at PSU. The parameterization is based on parcel perturbation theory developed in conjunction with a 1-D Mellor Yamada 1.5-order planetary boundary layer scheme and the Kain-Fritsch deep convection model.

  15. Improving Convection Parameterization Using ARM Observations and NCAR Community Atmosphere Model

    SciTech Connect (OSTI)

    Zhang, Guang J

    2013-07-29

    Highlight of Accomplishments: We made significant contribution to the ASR program in this funding cycle by better representing convective processes in GCMs based on knowledge gained from analysis of ARM/ASR observations. In addition, our work led to a much improved understanding of the interaction among aerosol, convection, clouds and climate in GCMs.

  16. Numerical analysis of heat transfer by conduction and natural convection in loose-fill fiberglass insulation--effects of convection on thermal performance

    SciTech Connect (OSTI)

    Delmas, A.A.; Wilkes, K.E.

    1992-04-01

    A two-dimensional code for solving equations of convective heat transfer in porous media is used to analyze heat transfer by conduction and convection in the attic insulation configuration. The particular cases treated correspond to loose-fill fiberglass insulation, which is characterized by high porosity and air permeability. The effects of natural convection on the thermal performance of the insulation are analyzed for various densities, permeabilities, and thicknesses of insulation. With convection increasing the total heat transfer through the insulation, the thermal resistance was found to decrease as the temperature difference across the insulating material increases. The predicted results for the thermal resistance are compared with data obtained in the large-scale climate simulator at the Roof Research Center using the attic test module, where the same phenomenon has already been observed. The way the wood joists within the insulation influence the start of convection is studied for differing thermophysical and dynamic properties of the insulating material. The presence of wood joists induces convection at a lower temperature difference.

  17. Coordinated Airborne Studies in the Tropics (CAST) Field Campaign...

    Office of Scientific and Technical Information (OSTI)

    ... believe that this may be the result of a change in air-mass origin arriving at the site. ... 2014. "Rapid transport of East Asian pollution to the deep tropics," Atmospheric ...

  18. Energy Design Guidelines for High Performance Schools: Tropical Island Climates

    SciTech Connect (OSTI)

    2004-11-01

    Design guidelines outline high performance principles for the new or retrofit design of K-12 schools in tropical island climates. By incorporating energy improvements into construction or renovation plans, schools can reduce energy consumption and costs.

  19. Materials research at selected Japanese laboratories. Based on a 1992 visit: Overview, summary of highlights, notes on laboratories and topics

    SciTech Connect (OSTI)

    Not Available

    1994-02-01

    I visited Japan from June 29 to August 1, 1992. The purpose of this visit was to assess the status of materials science research at selected governmental, university and industrial laboratories and to established acquaintances with Japanese researchers. The areas of research covered by these visits included ceramics, oxide superconductors, intermetallics alloys, superhard materials and diamond films, high-temperature materials and properties, mechanical properties, fracture, creep, fatigue, defects, materials for nuclear reactor applications and irradiation effects, high pressure synthesis, self-propagating high temperature synthesis, microanalysis, magnetic properties and magnetic facilities, and surface science.

  20. ARM - PI Product - Tropical Cloud Properties and Radiative Heating Profiles

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    ProductsTropical Cloud Properties and Radiative Heating Profiles ARM Data Discovery Browse Data Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send PI Product : Tropical Cloud Properties and Radiative Heating Profiles We have generated a suite of products that includes merged soundings, cloud microphysics, and radiative fluxes and heating profiles. The cloud microphysics is strongly based on the ARM Microbase value added product (Miller et al.,

  1. Atmospheric Radiation Measurement Tropical Warm Pool International Cloud Experiment

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Tropical Warm Pool International Cloud Experiment General Description The Tropical Warm Pool - International Cloud Experiment (TWP-ICE) was a collaborative effort led by the U.S. Department of Energy's Atmospheric Radiation Measurement (ARM) Program and the Australian Bureau of Meteorology. Beginning January 21 and ending February 14, 2006, the experiment was conducted in the region near the ARM Climate Research Facility in Darwin, Northern Australia. This permanent facility is fully equipped

  2. The structure and dynamics of patterns of Benard convection cells

    SciTech Connect (OSTI)

    Rivier, N. Imperial Coll. of Science and Technology, London . Blackett Lab. Lausanne Univ. . Inst. de Physique Experimentale)

    1990-08-01

    Benard-Marangoni convection, in containers with large aspect ratio, exhibits space-filling cellular structures, highly deformable, but crystallized. They contain dislocations and grain boundaries generated and moved by elementary topological transformations, and are subjected to a weak shear stress due to the earth's rotation. The cellular structure and its fluctuations are analyzed from a crystallographic viewpoint, by using two complementary approaches. One is a global analysis of cellular structures in cylindrical symmetry. Their structural stability and defect pattern are obtained as topological mode-locking of a continuous structural parameter. The other, a local, molecular dynamics of the cells, gives a realistic parametrization of the forces and the transformations by generalizing the Voronoi cell construction in one extra dimension. 23 refs., 8 figs.

  3. Operating temperatures for a convectively cooled recessed incandescent light fixture

    SciTech Connect (OSTI)

    Yarbrough, D.W.; Toor, I.

    1980-12-01

    Test results are given for the operation of a recessed incandescent light fixture intended for residential use. The fixture is labeled for use in direct contact with attic thermal insulation. Temperature control of the powered fixture is provided by convective heat transfer from the ceiling side of the fixture. The fixture was operated at power levels up to two times the rated power of 75 watts and under thermal insulations up to R-40. In all operating configurations tested the fixture surface in contact with attic insulation was found to be less than 175/sup 0/C. The observed surface temperatures are judged to be safe for operation in contact with loose-fill or batt-type insulations. It was observed that the power leads inside one fixture configuration are exposed to temperatures as high as 168/sup 0/C. The electrical insulation could, therefore, have a limited life. The properties of the internal fixture wiring were not, however, studied in detail.

  4. Energy-related pollution of semi-tropical and tropical nearshore ecosystems. Annual report, 1981-1982

    SciTech Connect (OSTI)

    Thorhaug, A.; Marcus, J.H.

    1982-01-01

    The major components of the nearshore marine ecosystems in the subtropics and tropics (seagrasses, mangroves, and corals) are examined and compound sublethal and lethal effects from extremes in some energy-related effects (temperature, salinity and light) are discussed.

  5. Secretary Chu to Visit Houston to Highlight Obama’s State of the Union Address, Discuss “All of the Above” Energy Strategy

    Broader source: Energy.gov [DOE]

    Secretary Chu to Visit Major Industrial Efficiency Project, Host State of the Union Town Hall at Houston Community College

  6. Secretary Bodman Visits Clean Energy Museum in Tokyo | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Clean Energy Museum in Tokyo Secretary Bodman Visits Clean Energy Museum in Tokyo December 12, 2006 - 9:46am Addthis Highlights Cooperation in Advancing Energy Efficient Technology and Increasing Use of Clean Energy Sources TOKYO, JAPAN - U.S. Secretary of Energy Samuel W. Bodman today toured the Tokyo Electric Power Company (TEPCO) Museum on his first stop in a three nation trip to Asia to advance global energy security in the Asia-Pacific region. In Tokyo Secretary Bodman met with U.S business

  7. January 12, 2009, Visiting Speakers Program - Status of a Key Enabling Technology - Presentation by Dr. Arthurs

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    09 SPIE Overview of the Status of a Key Enabling Technology DOE Visiting Speaker Program Washington DC January 12 th 2009 Eugene G. Arthurs, CEO SPIE © 2009 SPIE Points * SPIE - who we are & why we might know something * Photonics - pervasive and enabling * R&D trends * International view * Back in the USA * ITAR etc. © 2009 SPIE Do You Know? Yes, primacy in S&T contributed greatly to our economic well being and our national security. This was the glorious era of Bell Labs, RCA

  8. Interactions between cumulus convection and its environment as revealed by the MC3E sounding array

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Xie, Shaocheng; Zhang, Yunyan; Giangrande, Scott E.; Jensen, Michael P.; McCoy, Renata; Zhang, Minghua

    2014-10-27

    This study attempts to understand interactions between midlatitude convective systems and their environments through a heat and moisture budget analysis using the sounding data collected from the Midlatitude Continental Convective Clouds Experiment (MC3E) in central Oklahoma. Distinct large-scale structures and diabatic heating and drying profiles are presented for cases of weaker and elevated thunderstorms as well as intense squall line and supercell thunderstorm events during the campaign. The elevated cell events were nocturnal convective systems occurring in an environment having low convective available potential energy (CAPE) and a very dry boundary layer. In contrast, deeper convective events happened during themore » morning into early afternoon within an environment associated with large CAPE and a near-saturated boundary layer. As the systems reached maturity, the diagnosed diabatic heating in the latter deep convective cases was much stronger and of greater vertical extent than the former. Both groups showed considerable diabatic cooling in the lower troposphere, associated with the evaporation of precipitation and low-level clouds. The horizontal advection of moisture also played a dominant role in moistening the lower troposphere, particularly for the deeper convective events, wherein the near surface southeasterly flow allows persistent low-level moisture return from the Gulf of Mexico to support convection. The moisture convergence often was present before these systems develop, suggesting a strong correlation between the large-scale moisture convergence and convection. As a result, sensitivity tests indicated that the uncertainty in the surface precipitation and the size of analysis domain mainly affected the magnitude of these analyzed fields rather than their vertical structures.« less

  9. Convection in X-ray Bursts Michael Zingale Stony Brook University

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Convection in X-ray Bursts Michael Zingale Stony Brook University in collaboration with Ann Almgren, John Bell, Andy Nonaka (LBL); Chris Malone (LANL), Stan Woosley (UCSC) Supported by DOE/Office of Nuclear Physics, DE-FG02-06ER41448 and DE-FG02-87ER40317 to Stony Brook, and NSF award AST-1211563. Computer time: National Energy Research Scientific Computing Center (Office of Science, DOE DE-AC02-05CH11231) Convection in Astrophysics ● Evolution of many stellar systems dominated by convective

  10. US-VISIT Independent Verification and Validation Project: Test Bed Establishment Report

    SciTech Connect (OSTI)

    Jensen, N W; Gansemer, J D

    2011-01-21

    This document describes the computational and data systems available at the Lawrence Livermore National Laboratory for use on the US-VISIT Independent Verification and Validation (IV&V) project. This system - composed of data, software and hardware - is designed to be as close as a representation of the operational ADIS system as is required to verify and validate US-VISIT methodologies. It is not required to reproduce the computational capabilities of the enterprise-class operational system. During FY10, the test bed was simplified from the FY09 version by reducing the number of database host computers from three to one, significantly reducing the maintenance and overhead while simultaneously increasing system throughput. During the current performance period, a database transfer was performed as a set of Data Pump Export files. The previous RMAN backup from 2007 required the availability of an AIX system which is not required when using data pump. Due to efficiencies in the new system and process, loading of the database refresh was able to be accomplished in a much shorter time frame than was previously required. The FY10 Oracle Test Bed now consists of a single Linux platform hosting two Oracle databases including the 2007 copy as well as the October 2010 refresh.

  11. Compactification of Patterns by a Singular Convection or Stress

    SciTech Connect (OSTI)

    Rosenau, Philip

    2007-12-07

    A wide variety of propagating disturbances in physical systems are described by equations whose solutions lack a sharp propagating front. We demonstrate that presence of particular nonlinearities may induce such fronts. To exemplify this idea, we study both dissipative u{sub t}+{partial_derivative}{sub x}f(u)=u{sub xx} and dispersive u{sub t}+{partial_derivative}{sub x}f(u)+u{sub xxx}=0 patterns, and show that a weakly singular convection f(u)=-u{sup {alpha}}+u{sup m}, 0<{alpha}<1

  12. Convective heat transfer correlations for fenestration glazing cavities: A review

    SciTech Connect (OSTI)

    Zhao, Y.; Curcija, D.; Goss, W.P.

    1999-07-01

    Convective heat transfer in insulated glazing unit (IGU) cavities is a major component of the overall heat transfer in fenestration systems. Accurately quantifying the heat-transfer coefficient within the cavity is of great significance in calculating the center-of-glass U factor, the edge-of-glass U factor, and therefore the overall U factor. Over the past 40 years, along with the rapid development of experimental techniques and numerical methods as well as the powerful computer systems, the heat-transfer correlations have been updated either from experimental data or from numerical data from time to time. The literature reviewed here covers correlations based on simplified analytical studies, on the experimental data, and on the numerical results. In addition, most of the correlation equations cover the typical design range of fenestration glazing cavities, e.g., Ra < 20,000. Inconsistencies and discrepancies existing between different experimental observations, and between derived numerical/analytical correlations and available experimental data, are discussed.

  13. Radial convection of finite ion temperature, high amplitude plasma blobs

    SciTech Connect (OSTI)

    Wiesenberger, M. Kendl, A.; Madsen, J.

    2014-09-15

    We present results from simulations of seeded blob convection in the scrape-off-layer of magnetically confined fusion plasmas. We consistently incorporate high fluctuation amplitude levels and finite Larmor radius (FLR) effects using a fully nonlinear global gyrofluid model. This is in line with conditions found in tokamak scrape-off-layers (SOL) regions. Varying the ion temperature, the initial blob width, and the initial amplitude, we found an FLR dominated regime where the blob behavior is significantly different from what is predicted by cold-ion models. The transition to this regime is very well described by the ratio of the ion gyroradius to the characteristic gradient scale length of the blob. We compare the global gyrofluid model with a partly linearized local model. For low ion temperatures, we find that simulations of the global model show more coherent blobs with an increased cross-field transport compared to blobs simulated with the local model. The maximal blob amplitude is significantly higher in the global simulations than in the local ones. When the ion temperature is comparable to the electron temperature, global blob simulations show a reduced blob coherence and a decreased cross-field transport in comparison with local blob simulations.

  14. Theoretical analysis of solar-driven natural convection energy conversion systems

    SciTech Connect (OSTI)

    Jacobs, E.W.; Lasier, D.D.

    1984-01-01

    This report presents a theoretical study of solar-powered natural convection tower (chimney) performance. Both heated and cooled towers are analyzed; the latter uses evaporating water as the cooling mechanism. The results, which are applicable to any open-cycle configuration, show that the ideal conversion efficiencies of both heated and cooled natural convection towers are linear functions of height. The performance of a heated tower in an adiabatic atmosphere ideally approaches the Carnot efficiency limit of approx. = 3.4%/km (1.0%/1000 ft). Including water pumping requirements, the ideal limit to cooled tower performance is approx. = 2.75%/km (0.85%/1000 ft). Ambient atmospheric conditions such as vertical temperature gradient (lapse rate) and relative humidity can have significantly adverse effects on natural convection tower performance. The combined effects of lapse rate and ambient relative humidity are especially important to cooled natural convection towers.

  15. Evaluation of tropical channel refinement using MPAS-A aquaplanet simulations: TROPICAL CHANNEL REFINEMENT IN MPAS-A

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Martini, Matus N.; Gustafson, William I.; O'Brien, Travis A.; Ma, Po-Lun

    2015-09-01

    Climate models with variable-resolution grids offer a computationally less expensive way to provide more detailed information at regional scales and increased accuracy for processes that cannot be resolved by a coarser grid. This study uses the Model for Prediction Across Scales–Atmosphere (MPAS22A), consisting of a nonhydrostatic dynamical core and a subset of Advanced Research Weather Research and Forecasting (ARW-WRF) model atmospheric physics that have been modified to include the Community Atmosphere Model version 5 (CAM5) cloud fraction parameterization, to investigate the potential benefits of using increased resolution in an tropical channel. The simulations are performed with an idealized aquaplanet configurationmore » using two quasi-uniform grids, with 30 km and 240 km grid spacing, and two variable-resolution grids spanning the same grid spacing range; one with a narrow (20°S–20°N) and one with a wide (30°S–30°N) tropical channel refinement. Results show that increasing resolution in the tropics impacts both the tropical and extratropical circulation. Compared to the quasi-uniform coarse grid, the narrow-channel simulation exhibits stronger updrafts in the Ferrel cell as well as in the middle of the upward branch of the Hadley cell. The wider tropical channel has a closer correspondence to the 30 km quasi-uniform simulation. However, the total atmospheric poleward energy transports are similar in all simulations. The largest differences are in the low-level cloudiness. The refined channel simulations show improved tropical and extratropical precipitation relative to the global 240 km simulation when compared to the global 30 km simulation. All simulations have a single ITCZ. The relatively small differences in mean global and tropical precipitation rates among the simulations are a promising result, and the evidence points to the tropical channel being an effective method for avoiding the extraneous numerical artifacts seen in earlier

  16. Mixed convection radiative flow of three dimensional Maxwell fluid over an inclined stretching sheet in presence of thermophoresis and convective condition

    SciTech Connect (OSTI)

    Ashraf, M. Bilal; Hayat, T.; Shehzad, S. A.; Alsaedi, A.

    2015-02-15

    Three dimensional radiative flow of Maxwell fluid over an inclined stretching surface with convective boundary condition is investigated. Heat and mass transfer analysis is taken into account with thermophoresis effects. Similarity transformations are utilized to reduce the partial differential equations into ordinary differential equations. Series solutions of velocity, temperature and concentration are developed. Influence of different parameters Biot number, therrmophoretic parameter, Deborah number, ratio parameter, inclined stretching angle, radiation parameter, mixed convection parameter and concentration buoyancy parameter on the non-dimensional velocity components, temperature and concentration are plotted and discussed in detail. Physical quantities of interests are tabulated and examined.

  17. Tropical cyclone motion and recurvature in TCM-90. Master's thesis

    SciTech Connect (OSTI)

    Fitzpatrick, M.E.

    1992-01-01

    Rawinsonde and satellite data collected during the Tropical Cyclone Motion (TCM90) experiment, which was conducted during the summer of 1990 in the Western North pacific, is used to examine tropical cyclone steering motion and recurvature. TCM-90 composite results are compared with those found in a composite study using twenty-one years (1957-77) of Western North Pacific rawinsonde data during the same August-September period and also for all months during this same 21-year period. Both data sets indicate that the composite deep-layer-mean (850-300 mb) winds 5-7 deg from the cyclone center provide an important component of the steering flow for tropical cyclones. However, despite the rawinsonde data enhancements of the TCM-90 experiment, data limitations prevented an accurate observation of steering flow conditions at individual time periods or for the average of only 5-10 time periods when composited together.

  18. Transport Induced by Large Scale Convective Structures in a Dipole-Confined Plasma

    SciTech Connect (OSTI)

    Grierson, B. A.; Mauel, M. E.; Worstell, M. W.; Klassen, M.

    2010-11-12

    Convective structures characterized by ExB motion are observed in a dipole-confined plasma. Particle transport rates are calculated from density dynamics obtained from multipoint measurements and the reconstructed electrostatic potential. The calculated transport rates determined from the large-scale dynamics and local probe measurements agree in magnitude, show intermittency, and indicate that the particle transport is dominated by large-scale convective structures.

  19. On the Features of Radiative and Convective Regimes Under the Cumulus Cloudiness

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    On the Features of Radiative and Convective Regimes Under the Cumulus Cloudiness B. M. Koprov, V. M. Koprov, G. S. Golitsyn A.M. Oboukhov Institute of Atmospheric Physics Moscow, Russia E. N. Kadygrov, A. V. Koldaev Central Aerological Observatory Dolgoprudny, Russia Introduction The study of instant temperature field transformation, convective and radiative regime perturbation within the layer of 0 to 650 m was fulfilled as caused by cloud modulation of solar radiation flux. It was made within

  20. HYDRODYNAMIC SIMULATIONS OF H ENTRAINMENT AT THE TOP OF He-SHELL FLASH CONVECTION

    SciTech Connect (OSTI)

    Woodward, Paul R.; Lin, Pei-Hung; Herwig, Falk E-mail: fherwig@uvic.ca

    2015-01-01

    We present the first three-dimensional, fully compressible gas-dynamics simulations in 4? geometry of He-shell flash convection with proton-rich fuel entrainment at the upper boundary. This work is motivated by the insufficiently understood observed consequences of the H-ingestion flash in post-asymptotic giant branch (post-AGB) stars (Sakurai's object) and metal-poor AGB stars. Our investigation is focused on the entrainment process at the top convection boundary and on the subsequent advection of H-rich material into deeper layers, and we therefore ignore the burning of the proton-rich fuel in this study. We find that for our deep convection zone, coherent convective motions of near global scale appear to dominate the flow. At the top boundary convective shear flows are stable against Kelvin-Helmholtz instabilities. However, such shear instabilities are induced by the boundary-layer separation in large-scale, opposing flows. This links the global nature of thick shell convection with the entrainment process. We establish the quantitative dependence of the entrainment rate on grid resolution. With our numerical technique, simulations with 1024{sup 3} cells or more are required to reach a numerical fidelity appropriate for this problem. However, only the result from the 1536{sup 3} simulation provides a clear indication that we approach convergence with regard to the entrainment rate. Our results demonstrate that our method, which is described in detail, can provide quantitative results related to entrainment and convective boundary mixing in deep stellar interior environments with very stiff convective boundaries. For the representative case we study in detail, we find an entrainment rate of 4.38 1.48 10{sup 13} M {sub ?} s{sup 1}.

  1. Mixed convection heat transfer from thermal sources mounted on horizontal and vertical surfaces

    SciTech Connect (OSTI)

    Tewari, S.S.; Jaluria, Y. )

    1990-11-01

    An experimental study is carried out on the fundamental aspects of the conjugate, mixed convective heat transfer from two finite width heat sources, which are of negligible thickness, have a uniform heat flux input at the surface, and are located on a flat plate in a horizontal or the vertical orientation. The heat sources are wide in the transverse direction and, therefore, a two-dimensional flow circumstance is simulated. The mixed convection parameter is varied over a fairly wide range to include the buoyancy-dominated and the mixed convection regimes. The circumstances of pure natural convection are also investigated. The convective mechanisms have been studied in detail by measuring the surface temperatures and determining the heat transfer coefficients for the two heated strips, which represent isolated thermal sources. Experimental results indicate that a stronger upstream heat source causes an increase in the surface temperature of a relatively weaker heat source, located downstream, by reducing it convective heat transfer coefficient. The influence of the upstream source is found to be strongly dependent on the surface orientation, especially in the pure natural convection and the buoyancy dominated regimes. The two heat sources are found to be essentially independent on the surface orientation, especially in the pure natural convection and the buoyancy dominated regimes. The two heat sources are found to be essentially independent of each other, in terms of thermal effects, at a separation distance of more than about three strip widths for both the orientations. The results obtained are relevant to many engineering applications, such as the cooling of electronic systems, positioning of heating elements in furnaces, and safety considerations in enclosure fires.

  2. Sensitivity of Boundary-layer and Deep Convective Cloud Simulations to

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Vertical Resolution Sensitivity of Boundary-layer and Deep Convective Cloud Simulations to Vertical Resolution Cheng, Anning Langley Research Center Xu, Kuan-Man NASA Langley Research Center Category: Modeling This study investigates the effects of vertical resolution on the simulation of boundary-layer and deep convective clouds using a cloud resolving model (CRM). A CRM usually uses a vertical grid spacing less than 100 m to simulate boundary layer clouds such as shallow cumuli and

  3. Film condensation of saturated and superheated vapors along isothermal vertical surfaces in mixed convection

    SciTech Connect (OSTI)

    Winkler, C.M.; Chen, T.S.; Minkowycz, W.J.

    1999-09-01

    An analysis for condensation from an isothermal vertical flat plate in mixed convection is reported. The entire mixed convection regime is divided into two regions. One region covers the forced-convection-dominated regime, and the other covers the free-convection-dominated regime. The governing system of equations is first transformed into a dimensionless form by the nonsimilar transformation, separately for each regime, and then solved using the local nonsimilarity method along with a finite difference scheme. Two nonsimilarity parameters are introduced. The parameter {xi}{sub f} = Gr{sub x}/Re{sub x}{sup 2} characterizes the effect of buoyancy force on forced convection, while the parameter {xi}{sub n} = Re{sub x}/Gr{sub x}{sup 1/2} characterizes the effect of forced flow on free convection. Numerical results for pure steam and refrigerant R-134a are presented for both saturated and superheated cases. It is found that the buoyancy force significantly increases the wall shear stress and condensate mass flux. To a lesser degree, the buoyancy force also increases the wall heat flux. Superheating is found to have an insignificant effect on wall heat flux for a pure vapor.

  4. Multi-institutional project to study climate change's effect on tropical

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    forests Multi-institutional project to study climate change's effect on tropical forests Alumni Link: Opportunities, News and Resources for Former Employees Latest Issue:September 2015 all issues All Issues » submit Multi-institutional project to study climate change's effect on tropical forests An expansive new project called Next Generation Ecosystem Experiments-Tropics aims to bring the future of tropical forests into much clearer focus May 1, 2015 Overhead view of Amazon forest, at risk

  5. Multi-institutional project to study climate change's effect on tropical

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    forests Climate change's effect on tropical forests Multi-institutional project to study climate change's effect on tropical forests An expansive new project called Next Generation Ecosystem Experiments-Tropics aims to bring the future of tropical forests into much clearer focus April 1, 2015 Overhead view of Amazon forest, at risk from a warming climate. Photo credit: Hugo Glendinning Overhead view of Amazon forest, at risk from a warming climate. Photo credit: Hugo Glendinning Contact Los

  6. Evidence for island effects and diurnal signals in satellite images of clouds over the tropical western pacific

    SciTech Connect (OSTI)

    Barr-Kumarakulasinghe, S.A.; Reynolds, R.M.; Minnett, P.J.

    1996-04-01

    Instruments to measure atmospheric radiation and ancillary meteorological variables will be set up on Manus Island as the first site of the tropical western pacific (TWP) locale of the Atmospheric Radiation Measurements (ARM) program. Manus is in the {open_quotes}warm pool{close_quotes} region of the TWP. This region is critical in establishing global atmospheric circulation patterns and is a primary energy source for the Hadley and Walker cells. The myriad islands and enclosed seas in the immediate vicinity of Manus have been referred to as the {open_quotes}maritime continent{close_quotes}, which has the deepest convective activity in the world. Manus is in a region having a global impact on climate and where island effects on clouds are likely to be important. In this preliminary analysis we have sought evidence of island effects in the cloud fields around Manus and have studied the variability of the diurnal cycles of cloud cover over Manus and over other islands and areas of open sea in the region.

  7. Visit to Y-12 a real eye-opener for crew of USS Tennessee | Y-12 National

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Security Complex Visit to Y-12 a real ... Visit to Y-12 a real eye-opener for crew of USS Tennessee Posted: July 25, 2016 - 5:00pm Director of Assembly/Disassembly Operations Abe Mathews (left) gives the USS Tennessee sailors a behind the scenes look at Y-12. When the USS Tennessee patrols the world's oceans, stealthily submerged to depths unknown, the Ohio Class ballistic missile submarine is capable of carrying a payload of Trident II missiles tipped with W76 or W88 warheads. The

  8. Tropical forest soil microbial communities couple iron and carbon biogeochemistry

    SciTech Connect (OSTI)

    Dubinsky, E.A.; Silver, W.L.; Firestone, M.K.

    2009-10-15

    We report that iron-reducing bacteria are primary mediators of anaerobic carbon oxidation in upland tropical soils spanning a rainfall gradient (3500 - 5000 mm yr-1) in northeast Puerto Rico. The abundant rainfall and high net primary productivity of these tropical forests provide optimal soil habitat for iron-reducing and iron-oxidizing bacteria. Spatially and temporally dynamic redox conditions make iron-transforming microbial communities central to the belowground carbon cycle in these wet tropical forests. The exceedingly high abundance of iron-reducing bacteria (up to 1.2 x 10{sup 9} cells per gram soil) indicated that they possess extensive metabolic capacity to catalyze the reduction of iron minerals. In soils from the higher rainfall sites, measured rates of ferric iron reduction could account for up to 44 % of organic carbon oxidation. Iron reducers appeared to compete with methanogens when labile carbon availability was limited. We found large numbers of bacteria that oxidize reduced iron at sites with high rates of iron reduction and large numbers of iron-reducers. the coexistence of large populations of ironreducing and iron-oxidizing bacteria is evidence for rapid iron cycling between its reduced and oxidized states, and suggests that mutualistic interactions among these bacteria ultimately fuel organic carbon oxidation and inhibit CH4 production in these upland tropical forests.

  9. CALIBRATION OF THE MIXING-LENGTH THEORY FOR CONVECTIVE WHITE DWARF ENVELOPES

    SciTech Connect (OSTI)

    Tremblay, P.-E.; Ludwig, H.-G.; Freytag, B.; Fontaine, G.; Brassard, P.; Steffen, M.

    2015-02-01

    A calibration of the mixing-length parameter in the local mixing-length theory (MLT) is presented for the lower part of the convection zone in pure-hydrogen-atmosphere white dwarfs. The parameterization is performed from a comparison of three-dimensional (3D) CO5BOLD simulations with a grid of one-dimensional (1D) envelopes with a varying mixing-length parameter. In many instances, the 3D simulations are restricted to the upper part of the convection zone. The hydrodynamical calculations suggest, in those cases, that the entropy of the upflows does not change significantly from the bottom of the convection zone to regions immediately below the photosphere. We rely on this asymptotic entropy value, characteristic of the deep and adiabatically stratified layers, to calibrate 1D envelopes. The calibration encompasses the convective hydrogen-line (DA) white dwarfs in the effective temperature range 6000 ≤ T {sub eff} (K) ≤15, 000 and the surface gravity range 7.0 ≤ log g ≤ 9.0. It is established that the local MLT is unable to reproduce simultaneously the thermodynamical, flux, and dynamical properties of the 3D simulations. We therefore propose three different parameterizations for these quantities. The resulting calibration can be applied to structure and envelope calculations, in particular for pulsation, chemical diffusion, and convective mixing studies. On the other hand, convection has no effect on the white dwarf cooling rates until there is a convective coupling with the degenerate core below T {sub eff} ∼ 5000 K. In this regime, the 1D structures are insensitive to the MLT parameterization and converge to the mean 3D results, hence they remain fully appropriate for age determinations.

  10. Mixed convection transport from an isolated heat source module on a horizontal plate

    SciTech Connect (OSTI)

    Kang, B.H.; Jaluria, Y.; Tewari, S.S. )

    1990-08-01

    An experimental study of the mixed convective heat transfer from an isolated source of finite thickness, located on a horizontal surface in an externally induced forced flow, has been carried out. This problem is of particular interest in the cooling of electronic components and also in the thermal transport associated with various manufacturing systems, such as ovens and furnaces. The temperature distribution in the flow as well as the surface temperature variation are studied in detail. The dependence of the heat transfer rate on the mixed convection parameter and on the thickness of the heated element or source, particularly in the vicinity of the source, is investigated. The results obtained indicate that the heat transfer rate and fluid flow characteristics vary strongly with the mixed convection variables. The transition from a natural convection dominated flow to a forced convection dominated flow is studied experimentally and the basic characteristics of the two regimes determined. This transition has a strong influence on the temperature of the surface and on the heat transfer rate. As expected, the forced convection dominated flow is seen to be significantly more effective in the cooling of a heat dissipating component than a natural convection dominated flow. The location of the maximum temperature on the module surface, which corresponds to the minimum local heat transfer coefficient, is determined and discussed in terms of the underlying physical mechanisms. The results obtained are also compared with these for an element of negligible thickness and the effect of a significant module thickness on the transport is determined. Several other important aspects of fundamental and applied interest are studied in this investigation.

  11. The Midlatitude Continental Convective Clouds Experiment (MC3E) sounding network: operations, processing and analysis

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Jensen, M. P.; Toto, T.; Troyan, D.; Ciesielski, P. E.; Holdridge, D.; Kyrouac, J.; Schatz, J.

    2014-09-12

    The Midlatitude Continental Convective Clouds Experiment (MC3E) took place during the spring of 2011 centered in north-central Oklahoma, USA. The main goal of this field campaign was to capture the dynamical and microphysical characteristics of precipitating convective systems in the Central Plains. A major component of the campaign was a 6-site radiosonde array designed to capture the large-scale variability of the atmospheric state with the intent of deriving model forcing datasets. Over the course of the 46 day MC3E campaign, a total of 1362 radiosondes were launched from the enhanced sonde network. This manuscript describes the details of the instrumentationmore » used as part of the sounding array, the data processing activities including quality checks and humidity bias corrections and an analysis of the impacts of bias correction and algorithm assumptions on the determination of convective levels and indices. It is found that corrections for known radiosonde humidity biases and assumptions regarding the characteristics of the surface convective parcel result in significant differences in the derived values of convective levels and indices in many soundings.« less

  12. The Midlatitude Continental Convective Clouds Experiment (MC3E) sounding network: operations, processing and analysis

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Jensen, M. P.; Toto, T.; Troyan, D.; Ciesielski, P. E.; Holdridge, D.; Kyrouac, J.; Schatz, J.; Zhang, Y.; Xie, S.

    2015-01-27

    The Midlatitude Continental Convective Clouds Experiment (MC3E) took place during the spring of 2011 centered in north-central Oklahoma, USA. The main goal of this field campaign was to capture the dynamical and microphysical characteristics of precipitating convective systems in the US Central Plains. A major component of the campaign was a six-site radiosonde array designed to capture the large-scale variability of the atmospheric state with the intent of deriving model forcing data sets. Over the course of the 46-day MC3E campaign, a total of 1362 radiosondes were launched from the enhanced sonde network. This manuscript provides details on the instrumentationmore » used as part of the sounding array, the data processing activities including quality checks and humidity bias corrections and an analysis of the impacts of bias correction and algorithm assumptions on the determination of convective levels and indices. It is found that corrections for known radiosonde humidity biases and assumptions regarding the characteristics of the surface convective parcel result in significant differences in the derived values of convective levels and indices in many soundings. In addition, the impact of including the humidity corrections and quality controls on the thermodynamic profiles that are used in the derivation of a large-scale model forcing data set are investigated. The results show a significant impact on the derived large-scale vertical velocity field illustrating the importance of addressing these humidity biases.« less

  13. Deputy Secretary Sherwood-Randall Visits Waste Isolation Pilot Plant to Survey Recovery Progress, Support Stakeholders and Employees

    Broader source: Energy.gov [DOE]

    CARLSBAD, N.M. – Dr. Elizabeth Sherwood-Randall, Deputy Secretary of Energy, visited DOE’s Waste Isolation Pilot Plant (WIPP) on Tuesday for a firsthand look at the progress in the recovery of operations at the site and meet with employees and community leaders.

  14. Go ahead, visit those web sites, you can`t get hurt, can you?

    SciTech Connect (OSTI)

    Rothfuss, J.S.; Parrett, J.W.

    1997-02-01

    Browsing (surfing) the World Wide Web (the web) has exploded onto the Internet with an unprecedented popularity. Fueled by massive acceptance, the web client/server technology is leaping forward with a speed that competes with no other software technology. The primary force behind this phenomenon is the simplicity of the web browsing experience. People who have never touched a computer before can now perform sophisticated network tasks with a simple point-and-click. Unfortunately, this simplicity gives many, if not most, web wanderers the impression that the web browser is risk free, nothing more than a high powered television. This misconception is dangerous by creating the myth that a user visiting a web site is immune from subversive or malicious intent. While many want you to believe that surfing the web is as simple as using any other household appliance, it is not like surfing television channels, it is bi-directional. You can learn a lot of useful information from web sites. But, either directly or indirectly, others can also learn quite a bit about you. Of even more concern is a web sites` potential ability to exert control over the local computer. This paper tries to consolidate some of the current concerns that you should consider as you jump into the surf.

  15. CYCLIC THERMAL SIGNATURE IN A GLOBAL MHD SIMULATION OF SOLAR CONVECTION

    SciTech Connect (OSTI)

    Cossette, Jean-Francois; Charbonneau, Paul; Smolarkiewicz, Piotr K.

    2013-11-10

    Global magnetohydrodynamical simulations of the solar convection zone have recently achieved cyclic large-scale axisymmetric magnetic fields undergoing polarity reversals on a decadal time scale. In this Letter, we show that these simulations also display a thermal convective luminosity that varies in-phase with the magnetic cycle, and trace this modulation to deep-seated magnetically mediated changes in convective flow patterns. Within the context of the ongoing debate on the physical origin of the observed 11 yr variations in total solar irradiance, such a signature supports the thesis according to which all, or part, of the variations on decadal time scales and longer could be attributed to a global modulation of the Sun's internal thermal structure by magnetic activity.

  16. Stability and error analysis of nodal expansion method for convection-diffusion equation

    SciTech Connect (OSTI)

    Deng, Z.; Rizwan-Uddin; Li, F.; Sun, Y.

    2012-07-01

    The development, and stability and error analyses of nodal expansion method (NEM) for one dimensional steady-state convection diffusion equation is presented. Following the traditional procedure to develop NEM, the discrete formulation of the convection-diffusion equation, which is similar to the standard finite difference scheme, is derived. The method of discrete perturbation analysis is applied to this discrete form to study the stability of the NEM. The scheme based on the NEM is found to be stable for local Peclet number less than 4.644. A maximum principle is proved for the NEM scheme, followed by an error analysis carried out by applying the Maximum principle together with a carefully constructed comparison function. The scheme for the convection diffusion equation is of second-order. Numerical experiments are carried and the results agree with the conclusions of the stability and error analyses. (authors)

  17. Meridional flow in the solar convection zone. I. Measurements from gong data

    SciTech Connect (OSTI)

    Kholikov, S.; Serebryanskiy, A.; Jackiewicz, J.

    2014-04-01

    Large-scale plasma flows in the Sun's convection zone likely play a major role in solar dynamics on decadal timescales. In particular, quantifying meridional motions is a critical ingredient for understanding the solar cycle and the transport of magnetic flux. Because the signal of such features can be quite small in deep solar layers and be buried in systematics or noise, the true meridional velocity profile has remained elusive. We perform time-distance helioseismology measurements on several years worth of Global Oscillation Network Group Doppler data. A spherical harmonic decomposition technique is applied to a subset of acoustic modes to measure travel-time differences to try to obtain signatures of meridional flows throughout the solar convection zone. Center-to-limb systematics are taken into account in an intuitive yet ad hoc manner. Travel-time differences near the surface that are consistent with a poleward flow in each hemisphere and are similar to previous work are measured. Additionally, measurements in deep layers near the base of the convection zone suggest a possible equatorward flow, as well as partial evidence of a sign change in the travel-time differences at mid-convection zone depths. This analysis on an independent data set using different measurement techniques strengthens recent conclusions that the convection zone may have multiple 'cells' of meridional flow. The results may challenge the common understanding of one large conveyor belt operating in the solar convection zone. Further work with helioseismic inversions and a careful study of systematic effects are needed before firm conclusions of these large-scale flow structures can be made.

  18. The ARM program in the Tropical Western Pacific

    SciTech Connect (OSTI)

    Clements, W.E.; Barnes, F.J.; Ackerman, T.P.; Mather, J.H.

    1998-12-01

    The Department of Energy`s Atmospheric Radiation Measurement (ARM) Program was created in 1989 as part of the US Global Change Research Program to improve the treatment of atmospheric radiative and cloud processes in computer models used to predict climate change. The overall goal of the ARM program is to develop and test parameterizations of important atmospheric processes, particularly cloud and radiative processes, for use in atmospheric models. This goal is being achieved through a combination of field measurements and modeling studies. Three primary locales were chosen for extensive field measurement facilities. These are the Southern Great Plains of the United States, the Tropical Western Pacific, and the North Slope of Alaska and Adjacent Arctic Ocean. This paper describes the ARM program in the Tropical Western Pacific locale.

  19. Advection, Moistening, and Shallow-to-deep Convection Transitions During the Initiation and Propagation of Madden-Julian Oscillation

    SciTech Connect (OSTI)

    Hagos, Samson M.; Feng, Zhe; Landu, Kiranmayi; Long, Charles N.

    2014-09-11

    Using observations from the 2011 AMIE/DYNAMO field campaign over the Indian Ocean and a high-resolution regional model simulation, the processes that lead to the rapid shallow-to-deep convection transitions associated with the initiation and eastward propagation of the Madden-Julian Oscillation (MJO) are examined. By tracking the evolution of the depth of several thousand individual model simulated precipitation features, the role of and the processes that control the observed midtropospheric moisture buildup ahead of the detection of deep convection are quantified at large and convection scales. The frequency of shallow-to-deep convection transitions is found to be sensitive to this midlevel moisture and large-scale uplift. This uplift along with the decline of large-scale drying by equator-ward advection causes the moisture buildup leading to the initiation of the MJO. Convection scale moisture variability and uplift, and large-scale zonal advection play secondary roles.

  20. New bounded skew central difference scheme. Part 2: Application to natural convection in an eccentric annulus

    SciTech Connect (OSTI)

    Moukalled, F.; Darwish, M.

    1997-01-01

    The bounded skew central difference scheme (NVF SCDS) is used to study numerically the combined effect of vertical ({epsilon}{sub y}) and horizontal ({epsilon}{sub x}) eccentricities on natural convection in an annulus between a heated horizontal cylinder and its square enclosure. Four Rayleigh numbers (Ra = 10{sup 3}, 10{sup 4}, 10{sup 5}, and 10{sup 6}), three aspect ratios (R/L = 0.1, 0.2, and 0.3), and eccentricity values ranging from {minus}0.3 to 0.3 are considered. At constant enclosure aspect ratio, the total heat transfer increases with increasing Rayleigh number. For constant Rayleigh-number values, convection contribution to total heat transfer decreases with increasing values of R/L. For conduction-dominated flows, heat transfer increases with increasing {vert_bar}{epsilon}{sub y}{vert_bar} and/or {vert_bar}{epsilon}{sub x}{vert_bar}. For convection-dominated flows, heat transfer increases with decreasing {epsilon}{sub y} for {epsilon}{sub y} < 0, decreases with increasing {epsilon}{sub y} for {epsilon}{sub y} > 0, and decreases with decreasing {epsilon}{sub x} for {epsilon}{sub x} < 0. For the case when conduction and convection are of equal importance, there is a critical {epsilon}{sub x} for which the total heat transfer is minimum.

  1. Measurement of gas temperature and convection velocity profiles in a dc atmospheric glow discharge

    SciTech Connect (OSTI)

    Stepaniuk, Vadim P.; Ioppolo, Tindaro; Oetuegen, M. Volkan; Sheverev, Valery A.

    2007-12-15

    Gas temperature and convective velocity distributions are presented for an unconfined glow discharge in air at atmospheric pressure, with electric currents ranging between 30 and 92 mA. The vertically oriented discharge was formed between a pin anode (top) and an extended cathode. The temperature and velocity profiles were measured using laser-induced Rayleigh scattering and laser Doppler anemometry techniques, respectively. The temperature field exhibited a conical shape with the radius of hot temperature zone increasing toward the anode. A maximum temperature of 2470 K was observed on the discharge axis with the discharge current of 92 mA. Air velocity measurements around the discharge demonstrated that the shape and magnitude of the temperature field are strongly affected by natural convection. Estimates indicate that convective losses may account for more than 50% of the power input into the positive column of the discharge. The measured temperature fields and convective velocity profiles provide a set of data that is important for the evaluation of dc atmospheric glow discharges in various applications such as sound manipulation and acoustic noise mitigation.

  2. Compact fluorescent lamp using horizontal and vertical insulating septums and convective venting geometry

    DOE Patents [OSTI]

    Siminovitch, Michael

    1998-01-01

    A novel design for a compact fluorescent lamp, including a lamp geometry which will increase light output and efficacy of the lamp in a base down operating position by providing horizontal and vertical insulating septums positioned in the ballast compartment of the lamp to provide a cooler coldspot. Selective convective venting provides additional cooling of the ballast compartment.

  3. Compact fluorescent lamp using horizontal and vertical insulating septums and convective venting geometry

    DOE Patents [OSTI]

    Siminovitch, M.

    1998-02-10

    A novel design is described for a compact fluorescent lamp, including a lamp geometry which will increase light output and efficacy of the lamp in a base down operating position by providing horizontal and vertical insulating septums positioned in the ballast compartment of the lamp to provide a cooler coldspot. Selective convective venting provides additional cooling of the ballast compartment. 9 figs.

  4. Natural convection in tunnels at Yucca Mountain and impact on drift seepage

    SciTech Connect (OSTI)

    Halecky, N.; Birkholzer, J.T.; Peterson, P.

    2010-04-15

    The decay heat from radioactive waste that is to be disposed in the once proposed geologic repository at Yucca Mountain (YM) will significantly influence the moisture conditions in the fractured rock near emplacement tunnels (drifts). Additionally, large-scale convective cells will form in the open-air drifts and will serve as an important mechanism for the transport of vaporized pore water from the fractured rock in the drift center to the drift end. Such convective processes would also impact drift seepage, as evaporation could reduce the build up of liquid water at the tunnel wall. Characterizing and understanding these liquid water and vapor transport processes is critical for evaluating the performance of the repository, in terms of water-induced canister corrosion and subsequent radionuclide containment. To study such processes, we previously developed and applied an enhanced version of TOUGH2 that solves for natural convection in the drift. We then used the results from this previous study as a time-dependent boundary condition in a high-resolution seepage model, allowing for a computationally efficient means for simulating these processes. The results from the seepage model show that cases with strong natural convection effects are expected to improve the performance of the repository, since smaller relative humidity values, with reduced local seepage, form a more desirable waste package environment.

  5. A scaling analysis of thermoacoustic convection in a zero-gravity environment

    SciTech Connect (OSTI)

    Krane, R.J.; Parang, M.

    1982-01-01

    This paper presents a scaling analysis of a one-dimensional thermoacoustic convection heat transfer process in a zero-gravity environment. The relative importance of the terms in the governing equations is discussed for different time scales without attempting to solve the equations. The scaling analysis suggests certain generalizations that can be made in this class of heat transfer problems.

  6. What Goes Up Must Come Down: The Lifecycle of Convective Clouds (492nd Brookhaven Lecture)

    SciTech Connect (OSTI)

    Jensen, Michael

    2014-02-19

    Some clouds look like cotton balls and others like anvils. Some bring rain, some snow and sleet, and others, just shade. But, whether big and billowy or dark and stormy, clouds affect far more than the weather each day. Armed with measurements of clouds’ updrafts and downdrafts—which resemble airflow in a convection oven—and many other atmospheric interactions, scientists from Brookhaven Lab and other institutions around the world are developing models that are crucial for understanding Earth’s climate and forecasting future climate change. During his lecture, Dr. Jensen provides an overview of the importance of clouds in the Earth’s climate system before explaining how convective clouds form, grow, and dissipate. His discussion includes findings from the Midlatitude Continental Convective Clouds Experiment (MC3E), a major collaborative experiment between U.S. Department of Energy (DOE) and NASA scientists to document precipitation, clouds, winds, and moisture in 3-D for a holistic view of convective clouds and their environment.

  7. July 24, 2009, Visiting Speakers Program - The Next Generation of (Safety) Regulation for HRO's by Christopher Hart

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Regulating HRO's: Next Generation July 24, 2009 Federal Aviation Administration 1 Federal Aviation Administration The Next Generation of (Safety) Regulation for HRO's Presentation to: HSS Visiting Speakers Program Name: Christopher A. Hart Date: July 24, 2009 Aviation Safety Experience - Conventional Wisdom: More vigorous regulation and enforcement will result in improved safety - Lesson Learned from Experience: There is a mishap rate plateau beyond which further improvement necessitates a more

  8. Convection Heat Transfer in Three-Dimensional Turbulent Separated/Reattached Flow

    SciTech Connect (OSTI)

    Bassem F. Armaly

    2007-10-31

    The measurements and the simulation of convective heat transfer in separated flow have been a challenge to researchers for many years. Measurements have been limited to two-dimensional flow and simulations failed to predict accurately turbulent heat transfer in the separated and reattached flow region (prediction are higher than measurements by more than 50%). A coordinated experimental and numerical effort has been initiated under this grant for examining the momentum and thermal transport in three-dimensional separated and reattached flow in an effort to provide new measurements that can be used for benchmarking and for improving the simulation capabilities of 3-D convection in separated/reattached flow regime. High-resolution and non-invasive measurements techniques are developed and employed in this study to quantify the magnitude and the behavior of the three velocity components and the resulting convective heat transfer. In addition, simulation capabilities are developed and employed for improving the simulation of 3-D convective separated/reattached flow. Such basic measurements and simulation capabilities are needed for improving the design and performance evaluation of complex (3-D) heat exchanging equipment. Three-dimensional (3-D) convective air flow adjacent to backward-facing step in rectangular channel is selected for the experimental component of this study. This geometry is simple but it exhibits all the complexities that appear in any other separated/reattached flow, thus making the results generated in this study applicable to any other separated and reattached flow. Boundary conditions, inflow, outflow, and wall thermal treatment in this geometry can be well measured and controlled. The geometry can be constructed with optical access for non-intrusive measurements of the flow and thermal fields. A three-component laser Doppler velocimeter (LDV) is employed to measure simultaneously the three-velocity components and their turbulent fluctuations

  9. FACT SHEET U.S. Department of Energy Tropical Western Pacific

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Tropical Western Pacific The Atmospheric Radiation Measurement (ARM) Climate Research Facility established its second research facility, the Tropical Western Pacific (TWP) field measurement site, in 1996. This site consists of three research facilities: Manus (established in 1996), Nauru (1998), and Darwin (2002). The data collected at these sites help scientists better understand the role of the tropics in modulating or controlling significant aspects of the global climate and improve models

  10. Two-phase convective CO2 dissolution in saline aquifers

    SciTech Connect (OSTI)

    Martinez, Mario J.; Hesse, Marc A.

    2016-01-01

    Geologic carbon storage in deep saline aquifers is a promising technology for reducing anthropogenic emissions into the atmosphere. Dissolution of injected CO2 into resident brines is one of the primary trapping mechanisms generally considered necessary to provide long-term storage security. Given that diffusion of CO2 in brine is woefully slow, convective dissolution, driven by a small increase in brine density with CO2 saturation, is considered to be the primary mechanism of dissolution trapping. Previous studies of convective dissolution have typically only considered the convective process in the single-phase region below the capillary transition zone and have either ignored the overlying two-phase region where dissolution actually takes place or replaced it with a virtual region with reduced or enhanced constant permeability. Our objective is to improve estimates of the long-term dissolution flux of CO2 into brine by including the capillary transition zone in two-phase model simulations. In the fully two-phase model, there is a capillary transition zone above the brine-saturated region over which the brine saturation decreases with increasing elevation. Our two-phase simulations show that the dissolution flux obtained by assuming a brine-saturated, single-phase porous region with a closed upper boundary is recovered in the limit of vanishing entry pressure and capillary transition zone. For typical finite entry pressures and capillary transition zone, however, convection currents penetrate into the two-phase region. As a result, this removes the mass transfer limitation of the diffusive boundary layer and enhances the convective dissolution flux of CO2 more than 3 times above the rate assuming single-phase conditions.

  11. Tropical Storm Frances Situation Report, September 7, 2004 (4:00 PM EDT)

    SciTech Connect (OSTI)

    2004-09-07

    The report provides highlights related to impacts of Tropical Storm Frances. Sections on electric information, oil and gas information, storm track, and county outage data are provided.

  12. Tropical Storm Frances Situation Report, September 6, 2004 (10:00 AM EDT)

    SciTech Connect (OSTI)

    none,

    2004-09-06

    The report provides highlights related to impacts of Tropical Storm Frances. Sections on electric information, oil and gas information, storm track, and county outage data are provided.

  13. Tropical Storm Frances Situation Report, September 6, 2004 (10:00 PM EDT)

    SciTech Connect (OSTI)

    none,

    2004-09-06

    The report provides highlights related to impacts of Tropical Storm Frances. Sections on electric information, oil and gas information, storm track, and county outage data are provided.

  14. Tropical Storm Frances Situation Report, September 7, 2004 (10:00 AM EDT)

    SciTech Connect (OSTI)

    2004-09-07

    The report provides highlights related to impacts of Tropical Storm Frances. Sections on electric information, oil and gas information, storm track, and county outage data are provided.

  15. Amazon Column CO2 and CO Observations to Elucidate Tropical Ecosystem...

    Office of Scientific and Technical Information (OSTI)

    Title: Amazon Column CO2 and CO Observations to Elucidate Tropical Ecosystem Processes Authors: Dubey, Manvendra Krishna 1 ; Parker, Harrison Alexander 1 ; Myers, Katherine ...

  16. Tropical Storm Frances Situation Report, September 6, 2004 (4:00 PM EDT)

    SciTech Connect (OSTI)

    2004-09-06

    The report provides highlights related to impacts of Tropical Storm Frances. Sections on electric information, oil and gas information, storm track, and county outage data are provided.

  17. Tropical Africa: Land use, biomass, and carbon estimates for 1980

    SciTech Connect (OSTI)

    Brown, S.; Gaston, G.; Daniels, R.C.

    1996-06-01

    This document describes the contents of a digital database containing maximum potential aboveground biomass, land use, and estimated biomass and carbon data for 1980 and describes a methodology that may be used to extend this data set to 1990 and beyond based on population and land cover data. The biomass data and carbon estimates are for woody vegetation in Tropical Africa. These data were collected to reduce the uncertainty associated with the possible magnitude of historical releases of carbon from land use change. Tropical Africa is defined here as encompassing 22.7 x 10{sup 6} km{sup 2} of the earth`s land surface and includes those countries that for the most part are located in Tropical Africa. Countries bordering the Mediterranean Sea and in southern Africa (i.e., Egypt, Libya, Tunisia, Algeria, Morocco, South Africa, Lesotho, Swaziland, and Western Sahara) have maximum potential biomass and land cover information but do not have biomass or carbon estimate. The database was developed using the GRID module in the ARC/INFO{sup TM} geographic information system. Source data were obtained from the Food and Agriculture Organization (FAO), the U.S. National Geophysical Data Center, and a limited number of biomass-carbon density case studies. These data were used to derive the maximum potential and actual (ca. 1980) aboveground biomass-carbon values at regional and country levels. The land-use data provided were derived from a vegetation map originally produced for the FAO by the International Institute of Vegetation Mapping, Toulouse, France.

  18. ARM - Tropical Warm Pool - International Cloud Experiment (TWP-ICE)

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Related Links TWP-ICE Home Tropical Western Pacific Home ARM Data Discovery Browse Data Post-Experiment Data Sets Weather Summary (pdf, 6M) New York Workshop Presentations Experiment Planning TWP-ICE Proposal Abstract Detailed Experiment Description Science Plan (pdf, 1M) Operations Plan (pdf, 321K) Maps Contact Info Related Links Daily Report Report Archives Press Media Coverage TWP-ICE Fact Sheet (pdf, 211K) Press Releases TWP-ICE Images ARM flickr site <="" li=""

  19. A Model Evaluation Data Set for the Tropical ARM Sites

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Jakob, Christian

    This data set has been derived from various ARM and external data sources with the main aim of providing modelers easy access to quality controlled data for model evaluation. The data set contains highly aggregated (in time) data from a number of sources at the tropical ARM sites at Manus and Nauru. It spans the years of 1999 and 2000. The data set contains information on downward surface radiation; surface meteorology, including precipitation; atmospheric water vapor and cloud liquid water content; hydrometeor cover as a function of height; and cloud cover, cloud optical thickness and cloud top pressure information provided by the International Satellite Cloud Climatology Project (ISCCP).

  20. A Model Evaluation Data Set for the Tropical ARM Sites

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Jakob, Christian

    2008-01-15

    This data set has been derived from various ARM and external data sources with the main aim of providing modelers easy access to quality controlled data for model evaluation. The data set contains highly aggregated (in time) data from a number of sources at the tropical ARM sites at Manus and Nauru. It spans the years of 1999 and 2000. The data set contains information on downward surface radiation; surface meteorology, including precipitation; atmospheric water vapor and cloud liquid water content; hydrometeor cover as a function of height; and cloud cover, cloud optical thickness and cloud top pressure information provided by the International Satellite Cloud Climatology Project (ISCCP).

  1. Interaction of clouds, radiation, and the tropical warm pool sea surface temperatures

    SciTech Connect (OSTI)

    Schneider, N.; Zhang, G.J.; Barnett, T.P.; Ramanathan, V.

    1996-04-01

    The primary focus of this study is the Tropical Western Pacific (TWP). In this study, we combine in-situ observations Tropical Ocean Global Atmosphere [TOGA]-Coupled Ocean Atmosphere Response Experiment [COARE] and Central Equatorial Pacific Experiment [CEPEX] with satellite cloud data.

  2. Utilization of geothermal heat in tropical fruit-drying process

    SciTech Connect (OSTI)

    Chen, B.H.; Lopez, L.P.; King, R.; Fujii, J.; Tanaka, M.

    1982-10-01

    The power plant utilizes only the steam portion of the HGP-A well production. There are approximately 50,000 pounds per hour of 360/sup 0/F water produced (approximately 10 million Btu per hour) and the water is currently not used and is considered a waste. This tremendous resource could very well be used in applications such as food processing, food dehydration and other industrial processing that requires low-grade heat. One of the applications is examined, namely the drying of tropical fruits particularly the papaya. The papaya was chosen for the obvious reason that it is the biggest crop of all fruits produced on the Big Island. A conceptual design of a pilot plant facility capable of processing 1000 pounds of raw papaya per day is included. This facility is designed to provide a geothermally heated dryer to dehydrate papayas or other tropical fruits available on an experimental basis to obtain data such as drying time, optimum drying temperature, etc.

  3. Autecology of Vibrio vulnificus and Vibrio parahaemolyticus in tropical waters

    SciTech Connect (OSTI)

    Rivera, S.; Lugo, T.; Hazen, T.C.

    1988-12-31

    Water and shellfish samples collected from estuaries, mangroves, and beaches along the coast of Puerto Rico were examined for Vibrio vulnificus and Vibrio parahaemolyticus. An array of water quality parameters were also measured simultaneous with bacteria sampling. Both species of vibrio were associated with estuary and mangrove locations, and neither was isolated from sandy beaches. Densities of V. vulnificus were negatively correlated with salinity, 10--15 ppt being optimal. V. parahaemolyticus was isolated from sites with salinities between 20 and 35 ppt, the highest densities occurring at 20 ppt. Densities of Vibrio spp. and V. parahaemolyticus for a tropical estuary surpassed those reported for temperate estuaries by several orders of magnitude. Both densities of total Vibrio spp. and V. parahaemolyticus in the water were directly related to densities of fecal coliforms, unlike V. vulnificus. The incidence of ONPG(+) strains among sucrose({minus}) Vibrio spp. served as an indicator of the frequency of V. vulnificus in this group. More than 63% of the V. vulnificus isolated were pathogenic. V. vulnificus and V. parahaemolyticus occupy clearly separate niches within the tropical estuarine-marine ecosystem.

  4. Cavitation as a Mechanism to Enhance Wetting in a Mercury Thermal Convection Loop

    SciTech Connect (OSTI)

    Pawel, SJ

    2001-07-17

    Type 316L stainless steel was statically tested under cavitation conditions via an ultrasonic transducer externally mounted on a tube filled with ambient mercury. During the preliminary exposure (24 h, 20 kHz, 1.5 MPa), cavitation resulted in apparent wetting of the specimens by mercury as well as general surface roughening and wastage similar to erosion damage. Subsequently, a thermal convection loop identical to those used previously to study thermal gradient mass transfer was modified to include an externally-mounted donut-shaped transducer in order to similarly produce cavitation and wetting at temperatures prototypic of those expected in the SNS target. However, a series of attempts to develop cavitation and wetting on 316L specimens in the thermal convection loop was unsuccessful.

  5. The Conforming Virtual Element Method for the convection-diffusion-reaction equation with variable coeffcients.

    SciTech Connect (OSTI)

    Manzini, Gianmarco; Cangiani, Andrea; Sutton, Oliver

    2014-10-02

    This document describes the conforming formulations for virtual element approximation of the convection-reaction-diffusion equation with variable coefficients. Emphasis is given to construction of the projection operators onto polynomial spaces of appropriate order. These projections make it possible the virtual formulation to achieve any order of accuracy. We present the construction of the internal and the external formulation. The difference between the two is in the way the projection operators act on the derivatives (laplacian, gradient) of the partial differential equation. For the diffusive regime we prove the well-posedness of the external formulation and we derive an estimate of the approximation error in the H1-norm. For the convection-dominated case, the streamline diffusion stabilization (aka SUPG) is also discussed.

  6. Thermal convection in a sparcely packed porous layer saturated with suspended particles

    SciTech Connect (OSTI)

    Mackie, C.

    2000-04-01

    This analytical study has considered the incipient convection of a sparcely packed porous medium saturated with suspended particles. A linear stability analysis is performed to determine the effects of the permeability of the medium and suspended components on the conditions for incipient instability under a range of thermal boundary conditions. The flow in the medium is modeled by using the Brinkman-extended Darcy model. The analysis reveals that the stability of the system is affected significantly by the presence of the porous medium, state of particles and the thermal boundary conditions. Moreover, the results of this study bridge the gap between thermal convection in a porous medium and in a classical fluid with suspended particles.

  7. ARM - Midlatitude Continental Convective Clouds - Single Column Model Forcing (xie-scm_forcing)

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Xie, Shaocheng; McCoy, Renata; Zhang, Yunyan

    2012-10-25

    The constrained variational objective analysis approach described in Zhang and Lin [1997] and Zhang et al. [2001]was used to derive the large-scale single-column/cloud resolving model forcing and evaluation data set from the observational data collected during Midlatitude Continental Convective Clouds Experiment (MC3E), which was conducted during April to June 2011 near the ARM Southern Great Plains (SGP) site. The analysis data cover the period from 00Z 22 April - 21Z 6 June 2011. The forcing data represent an average over the 3 different analysis domains centered at central facility with a diameter of 300 km (standard SGP forcing domain size), 150 km and 75 km, as shown in Figure 1. This is to support modeling studies on various-scale convective systems.

  8. Noise-Sustained Convective Instability in a Magnetized Taylor-Couette Flow

    SciTech Connect (OSTI)

    W. Liu

    2009-02-20

    The helical magnetorotational instability of the magnetized Taylor-Couette flow is studied numerically in a finite cylinder. A distant upstream insulating boundary is shown to stabilize the convective instability entirely while reducing the growth rate of the absolute instability. The reduction is less severe with larger height. After modeling the boundary conditions properly, the wave patterns observed in the experiment turn out to be a noise-sustained convective instability. After the source of the noise resulted from unstable Ekman and Stewartson layers is switched off, a slowly-decaying inertial oscillation is observed in the simulation. We reach the conclusion that the experiments completed to date have not yet reached the regime of absolute instability.

  9. Noise-sustained convective instability in a magnetized Taylor-Couette flow

    SciTech Connect (OSTI)

    Liu, Wei

    2008-01-01

    The helical magnetorotational instability of the magnetized Taylor-Couette flow is studied numerically in a finite cylinder. A distant upstream insulating boundary is shown to stabilize the convective instability entirely while reducing the growth rate of the absolute instability. The reduction is less severe with larger height. After modeling the boundary conditions properly, the wave patterns observed in the experiment turn out to be a noise-sustained convective instability. After the source of the noise resulted from unstable Ekman and Stewartson layers is switched off, a slowly-decaying inertial oscillation is observed in the simulation. We reach the conclusion that the experiments completed to date have not yet reached the regime of absolute instability.

  10. Mixed Convection in the VHTR in the Event of a LOFA

    SciTech Connect (OSTI)

    Richard W. Johnson

    2012-05-01

    The US Department of Energy, Office of Nuclear Energy (DOE-NE) is supporting the development of a very high temperature reactor (VHTR) concept as the primary focus of it next generation nuclear power plant (NGNP) program. The VHTR is cooled by forcing helium downwards through the core into the lower plenum and out the hot duct. In the event that the coolant circulators are lost, the driving pressure drop across the core will reduce to zero and there will be the opportunity for natural circulation to occur. During the time that the circulators are powering down, the heat transfer in the core from the graphite blocks to the helium coolant will transform from turbulent forced convection to mixed convection, where buoyancy effects become important, to free or natural convection, where buoyancy is dominant. Analysis of the nature of the forced, mixed and free convection is best done using computational fluid dynamic (CFD) software that can provide fine details of the flow and heat transfer. However, CFD analysis involves approximations in the results because of the finite nature of the spatial and temporal discretizations required, the inexact nature of the turbulence models that are used and the finite precision of the computers employed. Therefore, it is necessary to validate the CFD computations. Validation is accomplished by comparing results from specific CFD computations to experimental data that have been taken specifically for the purpose of validation and that are related to the physical phenomena in question. The present report examines the flow and heat transfer parameters (dimensionless numbers) that characterize the flow and reports ranges for their values based on specific CFD studies performed for the VHTR.

  11. Impacts of Microphysical Scheme on Convective and Stratiform Characteristics in Two High Precipitation Squall Line Events

    SciTech Connect (OSTI)

    Wu, Di; Dong, Xiquan; Xi, Baike; Feng, Zhe; Kennedy, Aaron; Mullendore, Gretchen; Gilmore, Matthew; Tao, Wei-Kuo

    2013-10-04

    This study investigates the impact of snow, graupel, and hail processes on the simulated squall lines over the Southern Great Plains in the United States. Weather Research and Forecasting (WRF) model is used to simulate two squall line events in May 2007, and the results are validated against radar and surface observations in Oklahoma. Several microphysics schemes are tested in this study, including WRF 5-Class Microphysics Scheme (WSM5), WRF 6-Class Microphysics Scheme (WSM6), Goddard Three Ice scheme (Goddard 3-ice) with graupel, Goddard Two Ice scheme (Goddard 2-ice), and Goddard 3-ice hail scheme. The simulated surface precipitation is sensitive to the microphysics scheme, and especially to whether graupel or hail category is included. All of the three ice (3-ice) schemes overestimated the total precipitation, within which WSM6 has the highest overestimation. Two ice (2-ice) schemes, missing a graupel/hail category, produced less total precipitation than 3-ice schemes. By applying a radar-based convective/stratiform partitioning algorithm, we find that by including the graupel/hail processes, there is an increase in areal coverage, precipitation intensity, updraft and downdraft intensity in convective region and a reduction of areal coverage and its precipitation intensity in stratiform region. For vertical structures, all the bulk schemes, especially 2-ice schemes, have the highest reflectivity located at upper levels (~8 km), which is unrealistic compared to observations. In addition, this study shows the radar-based convective/stratiform partitioning algorithm can reasonably identify WRF simulated precipitation, wind and microphysics fields in both convective and stratiform regions.

  12. Posters A One-Dimensional Radiative Convective Model with Detailed Cloud Microphysics

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    5 Posters A One-Dimensional Radiative Convective Model with Detailed Cloud Microphysics J. Simmons, O. Lie-Svendsen, and K. Stamnes Geophysical Institute University of Alaska Fairbanks, Alaska The Arctic is a key element in determining the radiation budget of the earth. Within the polar regions, the net radiation (incoming solar radiation minus outgoing infrared radiation) is negative. To understand the role this energy deficit plays in the overall radiation budget, one must examine the

  13. A review on regional convection-permitting climate modeling: Demonstrations, prospects, and challenges

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Prein, Andreas; Langhans, Wolfgang; Fosser, Giorgia; Ferrone, Andrew; Ban, Nikolina; Goergen, Klaus; Keller, Michael; Tolle, Merja; Gutjahr, Oliver; Feser, Frauke; et al

    2015-05-27

    Regional climate modeling using convection permitting models (CPMs) emerges as a promising framework to provide more reliable climate information on regional to local scales compared to traditionally used large-scale models (LSMs). CPMs do not use convection parameterization schemes, known as a major source of errors and uncertainties, and have more accurate surface and orography elds. The drawback of CPMs is their high demand on computational resources. For this reason, the CPM climate simulations only appeared a decade ago. In this study we aim to provide a common basis for CPM climate simulations by giving a holistic review of the topic.more » The most important components in CPM, such as physical parameterizations and dynamical formulations are discussed, and an outlook on required future developments and computer architectures that would support the application of CPMs is given. Most importantly, this review presents the consolidated outcome of studies that addressed the added value of CPM climate simulations compared to LSMs. Most improvements are found for processes related to deep convection (e.g., precipitation during summer), for mountainous regions, and for the soil-vegetation-atmosphere interactions. The climate change signals of CPM simulations reveal increases in short and extreme rainfall events and an increased ratio of liquid precipitation at the surface (a decrease of hail) potentially leading to more frequent ash oods. Concluding, CPMs are a very promising tool for future climate research. However, coordinated modeling programs are crucially needed to assess their full potential and support their development.« less

  14. Microwave heating device for internal heating convection experiments, applied to Earth's mantle dynamics

    SciTech Connect (OSTI)

    Surducan, E.; Surducan, V.; Neamtu, C.; Limare, A.; Di Giuseppe, E.

    2014-12-15

    We report the design, construction, and performances of a microwave (MW) heating device for laboratory experiments with non-contact, homogeneous internal heating. The device generates MW radiation at 2.47 GHz from a commercial magnetron supplied by a pulsed current inverter using proprietary, feedback based command and control hardware and software. Specially designed MW launchers direct the MW radiation into the sample through a MW homogenizer, devised to even the MW power distribution into the sample's volume. An adjustable MW circuit adapts the MW generator to the load (i.e., the sample) placed in the experiment chamber. Dedicated heatsinks maintain the MW circuits at constant temperature throughout the experiment. Openings for laser scanning for image acquisition with a CCD camera and for the cooling circuits are protected by special MW filters. The performances of the device are analyzed in terms of heating uniformity, long term output power stability, and load matching. The device is used for small scale experiments simulating Earth's mantle convection. The 30 30 5 cm{sup 3} convection tank is filled with a water?based viscous fluid. A uniform and constant temperature is maintained at the upper boundary by an aluminum heat exchanger and adiabatic conditions apply at the tank base. We characterize the geometry of the convective regime as well as its bulk thermal evolution by measuring the velocity field by Particle Image Velocimetry and the temperature field by using Thermochromic Liquid Crystals.

  15. Two-dimensional forced convection perpendicular to the outdoor fenestration surface--FEM solution

    SciTech Connect (OSTI)

    Curcija, D.; Goss, W.P.

    1995-08-01

    Two-dimensional laminar forced convection on an outdoor fenestration surface, with the wind perpendicular to the glazing surface, was analyzed using the penalty function approach finite-element method (FEM). The air far from the fenestration surface (free-stream conditions) was assumed to be at ASHRAE standard fenestration conditions of {minus}18 C (0 F) and 6.7 m/s (15 mph). A prototype fenestration configuration of a typical wood casement window, consisting of a double-step frame and an insulating glazing unit (IGU), was used in defining the outdoor fenestration profile. A flat-plate geometry was also considered for purposes of comparison with other available numerical and experimental results and for validation of the results for the actual fenestration profile. The results are reported in the form of velocity vector plots and local convective surface heat transfer coefficients. Recommendations on the local outdoor surface convective heat transfer coefficient for use in two- and three-dimensional heat transfer analyses of fenestration systems are presented.

  16. A review on regional convection-permitting climate modeling: Demonstrations, prospects, and challenges

    SciTech Connect (OSTI)

    Prein, Andreas; Langhans, Wolfgang; Fosser, Giorgia; Ban, Nikolina; Goergen, Klaus; Keller, Michael; Tolle, Merja; Gutjahr, Oliver; Feser, Frauke; Brisson, Erwan; Kollet, Stefan; Schmidli, Juerg; van Lipzig, Nicole; Leung, Lai-Yung R.

    2015-05-27

    Regional climate modeling using convection permitting models (CPMs) emerges as a promising framework to provide more reliable climate information on regional to local scales compared to traditionally used large-scale models (LSMs). CPMs do not use convection parameterization schemes, known as a major source of errors and uncertainties, and have more accurate surface and orography elds. The drawback of CPMs is their high demand on computational resources. For this reason, the CPM climate simulations only appeared a decade ago. In this study we aim to provide a common basis for CPM climate simulations by giving a holistic review of the topic. The most important components in CPM, such as physical parameterizations and dynamical formulations are discussed, and an outlook on required future developments and computer architectures that would support the application of CPMs is given. Most importantly, this review presents the consolidated outcome of studies that addressed the added value of CPM climate simulations compared to LSMs. Most improvements are found for processes related to deep convection (e.g., precipitation during summer), for mountainous regions, and for the soil-vegetation-atmosphere interactions. The climate change signals of CPM simulations reveal increases in short and extreme rainfall events and an increased ratio of liquid precipitation at the surface (a decrease of hail) potentially leading to more frequent ash oods. Concluding, CPMs are a very promising tool for future climate research. However, coordinated modeling programs are crucially needed to assess their full potential and support their development.

  17. Use of ARM observations and numerical models to determine radiative and latent heating profiles of mesoscale convective systems for general circulation models

    SciTech Connect (OSTI)

    Tao, Wei-Kuo; Houze, Robert, A., Jr.; Zeng, Xiping

    2013-03-14

    This three-year project, in cooperation with Professor Bob Houze at University of Washington, has been successfully finished as planned. Both ARM (the Atmospheric Radiation Measurement Program) data and cloud-resolving model (CRM) simulations were used to identify the water budgets of clouds observed in two international field campaigns. The research results achieved shed light on several key processes of clouds in climate change (or general circulation models), which are summarized below. 1. Revealed the effect of mineral dust on mesoscale convective systems (MCSs) Two international field campaigns near a desert and a tropical coast provided unique data to drive and evaluate CRM simulations, which are TWP-ICE (the Tropical Warm Pool International Cloud Experiment) and AMMA (the African Monsoon Multidisciplinary Analysis). Studies of the two campaign data were contrasted, revealing that much mineral dust can bring about large MCSs via ice nucleation and clouds. This result was reported as a PI presentation in the 3rd ASR Science Team meeting held in Arlington, Virginia in March 2012. A paper on the studies was published in the Journal of the Atmospheric Sciences (Zeng et al. 2013). 2. Identified the effect of convective downdrafts on ice crystal concentration Using the large-scale forcing data from TWP-ICE, ARM-SGP (the Southern Great Plains) and other field campaigns, Goddard CRM simulations were carried out in comparison with radar and satellite observations. The comparison between model and observations revealed that convective downdrafts could increase ice crystal concentration by up to three or four orders, which is a key to quantitatively represent the indirect effects of ice nuclei, a kind of aerosol, on clouds and radiation in the Tropics. This result was published in the Journal of the Atmospheric Sciences (Zeng et al. 2011) and summarized in the DOE/ASR Research Highlights Summaries (see http://www.arm.gov/science/highlights/RMjY5/view). 3. Used radar

  18. Management of Philippine tropical forests: Implications to global warming

    SciTech Connect (OSTI)

    Lasco, R.D.

    1997-12-31

    The first part of the paper presents the massive changes in tropical land management in the Philippines as a result of a {open_quotes}paradigm shift{close_quotes} in forestry. The second part of the paper analyzes the impacts of the above management strategies on global warming, in general, preserved forests are neither sinks not sources of greenhouse gasses (GHG). Reforestation activities are primarily net sinks of carbon specially the use of fast growing reforestation species. Estimates are given for the carbon-sequestering ability of some commonly used species. The last part of the paper policy recommendations and possible courses of action by the government to maximize the role of forest lands in the mitigation of global warming. Private sector initiatives are also explored.

  19. Evaluation of tropical channel refinement using MPAS-A aquaplanet simulations

    SciTech Connect (OSTI)

    Martini, Matus N.; Gustafson, Jr., William I.; O'Brien, Travis A.; Ma, Po -Lun

    2015-09-13

    Climate models with variable-resolution grids offer a computationally less expensive way to provide more detailed information at regional scales and increased accuracy for processes that cannot be resolved by a coarser grid. This study uses the Model for Prediction Across Scales–Atmosphere (MPAS22A), consisting of a nonhydrostatic dynamical core and a subset of Advanced Research Weather Research and Forecasting (ARW-WRF) model atmospheric physics that have been modified to include the Community Atmosphere Model version 5 (CAM5) cloud fraction parameterization, to investigate the potential benefits of using increased resolution in an tropical channel. The simulations are performed with an idealized aquaplanet configuration using two quasi-uniform grids, with 30 km and 240 km grid spacing, and two variable-resolution grids spanning the same grid spacing range; one with a narrow (20°S–20°N) and one with a wide (30°S–30°N) tropical channel refinement. Results show that increasing resolution in the tropics impacts both the tropical and extratropical circulation. Compared to the quasi-uniform coarse grid, the narrow-channel simulation exhibits stronger updrafts in the Ferrel cell as well as in the middle of the upward branch of the Hadley cell. The wider tropical channel has a closer correspondence to the 30 km quasi-uniform simulation. However, the total atmospheric poleward energy transports are similar in all simulations. The largest differences are in the low-level cloudiness. The refined channel simulations show improved tropical and extratropical precipitation relative to the global 240 km simulation when compared to the global 30 km simulation. All simulations have a single ITCZ. Furthermore, the relatively small differences in mean global and tropical precipitation rates among the simulations are a promising result, and the evidence points to the tropical channel being an effective method for avoiding the extraneous numerical artifacts seen in earlier

  20. Evaluation of Tropical Channel Refinement using MPAS-A Aquaplanet Simulations

    SciTech Connect (OSTI)

    Martini, Matus; Gustafson, William I.; O'Brien, Travis A.; Ma, Po-Lun

    2015-09-13

    Climate models with variable-resolution grids offer a computationally less expensive way to provide more detailed information at regional scales and increased accuracy for processes that cannot be resolved by a coarser grid. This study uses the Model for Prediction Across Scales–Atmosphere (MPAS22A), consisting of a nonhydrostatic dynamical core and a subset of Advanced Research Weather Research and Forecasting (ARW-WRF) model atmospheric physics that have been modified to include the Community Atmosphere Model version 5 (CAM5) cloud fraction parameterization, to investigate the potential benefits of using increased resolution in an tropical channel. The simulations are performed with an idealized aquaplanet configuration using two quasi-uniform grids, with 30 km and 240 km grid spacing, and two variable-resolution grids spanning the same grid spacing range; one with a narrow (20°S–20°N) and one with a wide (30°S–30°N) tropical channel refinement. Results show that increasing resolution in the tropics impacts both the tropical and extratropical circulation. Compared to the quasi-uniform coarse grid, the narrow-channel simulation exhibits stronger updrafts in the Ferrel cell as well as in the middle of the upward branch of the Hadley cell. The wider tropical channel has a closer correspondence to the 30 km quasi-uniform simulation. However, the total atmospheric poleward energy transports are similar in all simulations. The largest differences are in the low-level cloudiness. The refined channel simulations show improved tropical and extratropical precipitation relative to the global 240 km simulation when compared to the global 30 km simulation. All simulations have a single ITCZ. The relatively small differences in mean global and tropical precipitation rates among the simulations are a promising result, and the evidence points to the tropical channel being an effective method for avoiding the extraneous numerical artifacts seen in earlier studies that