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Note: This page contains sample records for the topic "variable convection cape" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

Thermodynamic Variability within the Convective Boundary Layer Due to Horizontal Convective Rolls  

Science Conference Proceedings (OSTI)

Data from the Convection and Precipitation/Electrification (CaPE) Experiment conducted during the summer of 1991 are used to examine and quantify the horizontal variability of temperature and moisture within the convective boundary layer (CBL). ...

Tammy M. Weckwerth; James W. Wilson; Roger M. Wakimoto

1996-05-01T23:59:59.000Z

2

Sensitivities of Simulated Convective Storms to Environmental CAPE  

Science Conference Proceedings (OSTI)

A set of 225 idealized three-dimensional cloud-resolving simulations is used to explore convective storm behavior in environments with various values of CAPE (450, 800, 2000, and 3200 J kg?1). The simulations show that when CAPE = 2000 J kg?1 or ...

Cody Kirkpatrick; Eugene W. McCaul Jr.; Charles Cohen

2011-11-01T23:59:59.000Z

3

CAPE and Convective Events in the Southwest during the North American Monsoon  

Science Conference Proceedings (OSTI)

The relationship between atmospheric stability, measured as CAPE, and deep precipitating convection has been widely studied but is not definitive. In the maritime tropics, CAPE and precipitation are usually inversely correlated. In continental ...

David K. Adams; Enio P. Souza

2009-01-01T23:59:59.000Z

4

The Cape Canaveral Sea and River Breezes: Kinematic Structure and Convective Initiation  

Science Conference Proceedings (OSTI)

This study examines complex flow patterns associated with the Cape Canaveral sea breeze and sea-breeze front using dual-Doppler radar, sounding, and surface data collected on 26 July 1991 during the Convection and Precipitation/Electrification ...

Neil F. Laird; David A. R. Kristovich; Robert M. Rauber; Harry T. Ochs III; L. Jay Miller

1995-10-01T23:59:59.000Z

5

Tropical Convective Variability as 1/f Noise  

Science Conference Proceedings (OSTI)

Evidence is presented that the tropical convective variability behaves as 1/f noise for a 1–30-day period. This behavior is shown by analyzing the time series of convective available potential energy, which measures the degree of convective ...

Jun-Ichi Yano; Klaus Fraedrich; Richard Blender

2001-09-01T23:59:59.000Z

6

Sea Surface Temperature and Wind Stress Curl Variability near a Cape  

Science Conference Proceedings (OSTI)

The coupling between sea surface temperature (SST), SST gradients, and wind stress curl variability near a cape off Brazil is investigated using satellite observations and several different SST high-resolution analyses. The cape is characterized ...

Renato M. Castelao

2012-11-01T23:59:59.000Z

7

Quasi-Lagrangian Measurements in Convective Boundary Layer Plumes and Their Implications for the Calculation of CAPE  

Science Conference Proceedings (OSTI)

Measurements were made to determine the level of origin of air parcels participating in natural convection. Lagrangian measurements of conservative variables are ideal for this purpose. A simple remotely piloted vehicle was developed to make in ...

Nilton O. Rennó; Earle R. Williams

1995-09-01T23:59:59.000Z

8

Temperature and Salinity Variability in Heterogeneous Oceanic Convection  

Science Conference Proceedings (OSTI)

In regions of active oceanic convection, such as the Labrador Sea, small- and mesoscale spatial variability is observed in the temperature and salinity fields (T and S). Often T and S structures are “density-compensated,” with the density ...

Sonya Legg; James C. McWilliams

2000-06-01T23:59:59.000Z

9

Mechanisms for Precipitation Variability of the Eastern Brazil/SACZ Convective Margin  

Science Conference Proceedings (OSTI)

The present study examines the mechanisms for the connection between the precipitation variability in eastern Brazil and the South Atlantic convergence zone (SACZ) convective margin (eastern Brazil/SACZ convective margin) and the variability of ...

H.-Y. Ma; X. Ji; J. D. Neelin; C. R. Mechoso

2011-07-01T23:59:59.000Z

10

CAPE in Tropical Cyclones  

Science Conference Proceedings (OSTI)

Convective available potential energy (CAPE) and the vertical distribution of buoyancy were calculated for more than 2000 dropsonde soundings collected by the NOAA Gulfstream-IV aircraft. Calculations were done with and without the effects of ...

John Molinari; David M. Romps; David Vollaro; Leon Nguyen

2012-08-01T23:59:59.000Z

11

A Systemic Analysis of Multiscale Deep Convective Variability over the Tropical Pacific  

Science Conference Proceedings (OSTI)

The multiscale tropical deep convective variability over the Pacific Ocean is examined with the 4-month high-resolution deep convection index (ITBB) derived from satellite imagery. With a systemic view, the complex phenomenon is described with ...

Wen-wen Tung; Mitchell W. Moncrieff; Jian-Bo Gao

2004-07-01T23:59:59.000Z

12

Second law analysis for a variable viscosity plane Poiseuille flow with asymmetric convective cooling  

Science Conference Proceedings (OSTI)

A second-law analysis of a pressure-driven variable viscosity fluid flow through a channel with asymmetric convective cooling at the walls is investigated. Flow is assumed to be steady, laminar and fully-developed. The effect of heat generation due to ... Keywords: Asymmetric convective cooling, Entropy generation analysis, Poiseuille flow, Variable viscosity

O. D. Makinde; A. Aziz

2010-12-01T23:59:59.000Z

13

Can CAPE Maintain Polar Lows?  

Science Conference Proceedings (OSTI)

A unique dataset of atmospheric observations over the Nordic Seas has been analyzed to investigate the role of convective available potential energy (CAPE) for the energetics of polar lows. The observations were made during the flight campaign of ...

Torsten Linders; Øyvind Saetra

2010-08-01T23:59:59.000Z

14

Natural convection flow over an inclined flat plate with internal heat generation and variable viscosity  

Science Conference Proceedings (OSTI)

The present investigation deals with study of laminar natural convection flow of a viscous fluid over a semi-infinite flat plate inclined at a small angle to the horizontal with internal heat generation and variable viscosity. The dimensionless boundary ... Keywords: Heat generation, Inclined flat surface, Natural convection, Temperature dependent viscosity

S. Siddiqa; S. Asghar; M. A. Hossain

2010-11-01T23:59:59.000Z

15

Convectively Coupled Kelvin Waves over Tropical Africa during the Boreal Summer: Structure and Variability  

Science Conference Proceedings (OSTI)

The structure and variability of convectively coupled Kelvin waves during the boreal summer are explored using satellite-observed brightness temperature data and ECMWF reanalyses. Kelvin wave activity is most prominent between the central and ...

Ademe Mekonnen; Chris D. Thorncroft; Anantha R. Aiyyer; George N. Kiladis

2008-12-01T23:59:59.000Z

16

A Satellite Study of Tropical Moist Convection and Environmental Variability: A Moisture and Thermal Budget Analysis  

Science Conference Proceedings (OSTI)

The thermodynamic variability associated with moist convection over tropical oceans is analyzed by making use of a variety of satellite sensors including radars, an infrared and microwave sounder unit, and a microwave radiometer and scatterometer ...

Hirohiko Masunaga

2013-08-01T23:59:59.000Z

17

2–3-Day Convective Variability in the Tropical Western Pacific  

Science Conference Proceedings (OSTI)

This paper is an examination of 2–3-day convective variability in the tropical Pacific region. The initial focus of the paper is on the western tropical Pacific during the Tropical Ocean Global Atmosphere Coupled Ocean-Atmosphere Response ...

Carol Anne Clayson; Brian Strahl; Jon Schrage

2002-03-01T23:59:59.000Z

18

Variability of Updraft and Downdraft Characteristics in a Large Parameter Space Study of Convective Storms  

Science Conference Proceedings (OSTI)

Over 200 convective storm simulations are analyzed to examine the variability in storm vertical velocity and updraft area characteristics as a function of basic environmental parameters. While it is known that bulk properties of the troposphere ...

Cody Kirkpatrick; Eugene W. McCaul Jr.; Charles Cohen

2009-05-01T23:59:59.000Z

19

A Satellite Study of Tropical Moist Convection and Environmental Variability: A Moisture and Thermal Budget Analysis  

Science Conference Proceedings (OSTI)

The thermodynamic variability associated with moist convection over tropical oceans is analyzed by making use of a variety of satellite sensors including radars, an infrared and microwave sounder unit, and microwave radiometer and scatterometer ...

Hirohiko Masunaga

20

Conserved Variable Analysis of the Convective Boundary Layer Thermodynamic Structure over the Tropical Oceans  

Science Conference Proceedings (OSTI)

An analysis of FGGE dropwindsonde data using conserved thermodynamic variables shows mixing line structures for the convective boundary layer over the equatorial Pacific. Deeper boundary layers show a double structure. Reversals of the gradients ...

Alan K. Betts; Bruce A. Albrecht

1987-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "variable convection cape" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Radar Observations of Convective System Variability in Relationship to African Easterly Waves during the 2006 AMMA Special Observing Period  

E-Print Network (OSTI)

A radar-based analysis of the structure, motion, and rainfall variability of westward-propagating squall-line mesoscale convective systems (SLMCSs) in Niamey, Niger, during the African Monsoon Multidisciplinary Activities ...

Williams, Earle R.

22

Radar Observations of Convective System Variability in Relationship to African Easterly Waves during the 2006 AMMA Special Observing Period  

Science Conference Proceedings (OSTI)

A radar-based analysis of the structure, motion, and rainfall variability of westward-propagating squall-line mesoscale convective systems (SLMCSs) in Niamey, Niger, during the African Monsoon Multidisciplinary Activities (AMMA) 2006 special ...

Rosana Nieto Ferreira; Thomas Rickenbach; Nick Guy; Earle Williams

2009-12-01T23:59:59.000Z

23

Convective–Stratiform Precipitation Variability at Seasonal Scale from 8 Yr of TRMM Observations: Implications for Multiple Modes of Diurnal Variability  

Science Conference Proceedings (OSTI)

This study investigates the variability of convective and stratiform rainfall from 8 yr (1998–2005) of Tropical Rainfall Measuring Mission (TRMM) Precipitation Radar (PR) and TRMM Microwave Imager (TMI) measurements, focusing on seasonal diurnal ...

Song Yang; Eric A. Smith

2008-08-01T23:59:59.000Z

24

Group Analysis of Variable Coefficient Diffusion--Convection Equations. III. Conservation Laws  

E-Print Network (OSTI)

The notions of generating sets of conservation laws of systems of differential equations with respect to symmetry groups and equivalence groups are introduced and applied. This allows us to generalize essentially the procedure of finding potential symmetries for the systems with multidimensional spaces of conservation laws. A class of variable coefficient (1+1)-dimensional nonlinear diffusion-convection equations of general form $f(x)u_t=(g(x)A(u)u_x)_x+h(x)B(u)u_x$ is investigated. Using the most direct method, we carry out two classifications of local conservation laws up to equivalence relations generated by both usual and enhanced equivalence groups. Equivalence with respect to $\\hat G^{\\sim}$ and correct choice of gauge coefficients of equations play the major role for simple and clear formulation of the final results. The notion of contractions of conservation laws and one of characteristics of conservation laws are introduced and contractions of conservation laws of diffusion-convection equations are found.

N. M. Ivanova; R. O. Popovych; C. Sophocleous

2007-10-16T23:59:59.000Z

25

Misocyclone Characteristics along Florida Gust Fronts during CaPE  

Science Conference Proceedings (OSTI)

Multiple-Doppler radar and rawinsonde data are used to examine misocyclone characteristics along gust fronts observed during the Convection and Precipitation/Electrification (CaPE) project in Florida. The objective of this study is to investigate ...

Katja Friedrich; David E. Kingsmill; Carl R. Young

2005-11-01T23:59:59.000Z

26

Distribution of Helicity, CAPE, and Shear in Tropical Cyclones  

Science Conference Proceedings (OSTI)

The previous study of helicity, CAPE, and shear in Hurricane Bonnie (1998) was extended to all eight tropical cyclones sampled by NASA during the Convection and Moisture Experiments (CAMEX). Storms were categorized as having large or small ...

John Molinari; David Vollaro

2010-01-01T23:59:59.000Z

27

Assessing the Vertical Distribution of Convective Available Potential Energy  

Science Conference Proceedings (OSTI)

Comparisons of convective available potential energy (CAPE) with standard instability indices for evaluating the convective potential of the atmosphere such as the lifted index (LI) reveal only moderate correlations. This is because the LI is a ...

David O. Blanchard

1998-09-01T23:59:59.000Z

28

Sources of Mesoscale Variability of Gravity Waves. Part II: Frontal, Convective, and Jet Stream Excitation  

Science Conference Proceedings (OSTI)

We present studies of four cases of mesoscale variance enhancements of horizontal velocity and temperature due to frontal activity, nonfrontal convection, and wind shear. These data were obtained aboard commercial aircraft during the Global ...

David C. Fritts; Gregory D. Nastrom

1992-01-01T23:59:59.000Z

29

The “Year” of Tropical Convection (May 2008–April 2010): Climate Variability and Weather Highlights  

Science Conference Proceedings (OSTI)

The representation of tropical convection remains a serious challenge to the skillfulness of our weather and climate prediction systems. To address this challenge, the World Climate Research Programme (WCRP) and The Observing System Research and ...

Duane E. Waliser; Mitchell W. Moncrieff; David Burridge; Andreas H. Fink; Dave Gochis; B. N. Goswami; Bin Guan; Patrick Harr; Julian Heming; Huang-Hsuing Hsu; Christian Jakob; Matt Janiga; Richard Johnson; Sarah Jones; Peter Knippertz; Jose Marengo; Hanh Nguyen; Mick Pope; Yolande Serra; Chris Thorncroft; Matthew Wheeler; Robert Wood; Sandra Yuter

2012-08-01T23:59:59.000Z

30

Retrieval of Thermodynamic Variables within Deep Convective Clouds: Experiments in Three Dimensions  

Science Conference Proceedings (OSTI)

A three-dimensional thermodynamic retrieval method has been developed and tested for application to deep convective clouds. To test the accuracy of the method and for sensitivity studies, output from a three-dimensional numerical cloud model has ...

Carl E. Hane; Robert B. Wilhelmson; Tzvi Gal-Chen

1981-03-01T23:59:59.000Z

31

Variability of Graupel and Snow Observed in Tropical Oceanic Convection by Aircraft during TRMM KWAJEX  

Science Conference Proceedings (OSTI)

Empirical characterization of graupel and snow in precipitating tropical convective clouds is important for refining satellite precipitation retrieval algorithms and cloud-resolving and radiative transfer models. Microphysics data for this ...

Ellen M. Sukovich; David E. Kingsmill; Sandra E. Yuter

2009-02-01T23:59:59.000Z

32

Submonthly Convective Variability over South America and the South Atlantic Convergence Zone  

Science Conference Proceedings (OSTI)

Relationships between deep convection over South America and the atmospheric circulation are examined, with emphasis on submonthly variations of the South Atlantic convergence zone (SACZ) during austral summer. Outgoing longwave radiation (OLR) ...

Brant Liebmann; George N. Kiladis; JoséA. Marengo; Tércio Ambrizzi; John D. Glick

1999-07-01T23:59:59.000Z

33

Global Variability of Mesoscale Convective System Anvil Structure from A-Train Satellite Data  

Science Conference Proceedings (OSTI)

Mesoscale convective systems (MCSs) in the tropics produce extensive anvil clouds, which significantly affect the transfer of radiation. This study develops an objective method to identify MCSs and their anvils by combining data from three A-...

Jian Yuan; Robert A. Houze Jr.

2010-11-01T23:59:59.000Z

34

A Study of Two-Dimensional Dry Convective Plume Modes with Variable Critical Level Height  

Science Conference Proceedings (OSTI)

This study investigates the impact of wind speed and critical level height on dry convection above a prescribed heat source. This is done using the Advanced Regional Prediction System (ARPS) model in its two-dimensional form with an imposed 400-K ...

Michael T. Kiefer; Yuh-Lang Lin; Joseph J. Charney

2008-02-01T23:59:59.000Z

35

Double-diffusive convection with variable viscosity from a vertical truncated cone in porous media in the presence of magnetic field and radiation effects  

Science Conference Proceedings (OSTI)

This work is focused on the study of combined heat and mass transfer or double-diffusive convection near a vertical truncated cone embedded in a fluid-saturated porous medium in the presence of thermal radiation, magnetic field and variable viscosity ... Keywords: Double diffusion, Magnetic field, Porous media, Radiation, Truncated cone, Variable viscosity

A. Mahdy; A. J. Chamkha; Yousef Baba

2010-06-01T23:59:59.000Z

36

Thunderstorms above Frontal Surfaces in Environments without Positive CAPE. Part I: A Climatology  

Science Conference Proceedings (OSTI)

The first of two papers describing thunderstorms that occur above frontal surfaces, frequently in environments without positive convective available potential energy (CAPE), focuses on the climatology of such storms for the conterminous United ...

Bradley R. Colman

1990-05-01T23:59:59.000Z

37

CAPE Variations in the Current Climate and in a Climate Change  

Science Conference Proceedings (OSTI)

Observed variations of convective available potential energy (CAPE) in the current climate provide one useful test of the performance of cumulus parameterizations used in general circulation models (GCMs). It is found that frequency distributions ...

Bing Ye; Anthony D. Del Genio; Kenneth K-W. Lo

1998-08-01T23:59:59.000Z

38

Influence of the Synoptic-Scale Flow on Sea Breezes Observed during CaPE  

Science Conference Proceedings (OSTI)

Mean sea-breeze characteristics were determined by analyzing a number of sea-breeze events during offshore, parallel, and onshore flow regimes during the Convection and Precipitation/Electrification Experiment (CaPE). It was observed that ...

Nolan T. Atkins; Roger M. Wakimoto

1997-09-01T23:59:59.000Z

39

Horizontal Convective Rolls: Determining the Environmental Conditions Supporting their Existence and Characteristics  

Science Conference Proceedings (OSTI)

Data from the Convection and Precipitation/Electrification (CaPE) project, as well as results from numerical simulations, are used to study horizontal convective rolls. The environmental conditions necessary for sustaining rolls and for ...

Tammy M. Weckwerth; James W. Wilson; Roger M. Wakimoto; N. Andrew Crook

1997-04-01T23:59:59.000Z

40

Representing equilibrium and non-equilibrium convection in large-scale models  

Science Conference Proceedings (OSTI)

A new diagnostic convective closure, which is dependent on the convective available potential energy (CAPE), is derived under the quasi-equilibrium assumption for the free troposphere subject to boundary-layer forcing. The closure involves a ...

Peter Bechtold; Noureddine Semane; Philippe Lopez; Jean-Pierre Chaboureau; Anton Beljaars; Niels Bormann

Note: This page contains sample records for the topic "variable convection cape" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

The Effect of Small-Scale Moisture Variability on Thunderstorm Initiation  

Science Conference Proceedings (OSTI)

Observations during the Convection and Precipitation/Electrification (CaPE) project illustrate that horizontal convective rolls are capable of providing sufficient forcing to initiate free moist convection. Rolls occurred on the majority of days ...

Tammy M. Weckwerth

2000-12-01T23:59:59.000Z

42

Convective Precipitation Variability as a Tool for General Circulation Model Analysis  

Science Conference Proceedings (OSTI)

Precipitation variability is analyzed in two versions of the Community Atmospheric Model (CAM), the standard model, CAM, and a “multiscale modeling framework” (MMF), in which the cumulus parameterization has been replaced with a cloud-resolving ...

Charlotte A. DeMott; David A. Randall; Marat Khairoutdinov

2007-01-01T23:59:59.000Z

43

Convective Coupling and Interannual and Intraseasonal Coupled Variabilities in the Tropics  

Science Conference Proceedings (OSTI)

Recent analyses point at close structural similarities and intimate dynamical connections among the members of a wide spectrum of variabilities in the global Tropics. This suggests that these oscillations with widely different timescales may have ...

P. Goswami; Rameshan K.

2000-08-01T23:59:59.000Z

44

Spatial Variability of Liquid Water Path in Marine Low Cloud: The Importance of Mesoscale Cellular Convection  

Science Conference Proceedings (OSTI)

Liquid water path (LWP) mesoscale spatial variability in marine low cloud over the eastern subtropical oceans is examined using two months of daytime retrievals from the Moderate Resolution Imaging Spectroradiometer (MODIS) on the NASA Terra ...

Robert Wood; Dennis L. Hartmann

2006-05-01T23:59:59.000Z

45

Cape Wind Project  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

G G Biological Assessment U.S. Department of the Interior Minerals Management Service MMS Cape Wind Energy Project January 2009 Final EIS Appendix G Biological Assessment Cape Wind Energy Project Nantucket Sound Biological Assessment Minerals Management Service for Consultation with the United States Fish and Wildlife Service and NOAA Fisheries May 2008 Appendix G Biological Assessment Cape Wind Energy Project i May 2008 U.S. Department of the Interior Minerals Management Service MMS TABLE OF CONTENTS 1.0 BACKGROUND ............................................................................................................ 1-1 1.1 Project History .............................................................................................................

46

Observations of the Sea-Breeze Front during CaPE. Part II: Dual-Doppler and Aircraft Analysis  

Science Conference Proceedings (OSTI)

The three-dimensional kinematic structures of offshore and onshore flow sea-breeze fronts observed during the CaPE experiment are shown using high resolution dual-Doppler and aircraft data. The fronts interact with horizontal convective rolls (...

Nolan T. Atkins; Roger M. Wakimoto; Tammy M. Weckwerth

1995-04-01T23:59:59.000Z

47

Rossby Wave Radiation in the Cape Verde Frontal Zone  

Science Conference Proceedings (OSTI)

Radiating baroclinic Rossby waves excited through instability of the Cape Verde frontal zone are proposed as a mechanism for the generation of mesoscale variability at middepth (1000 m) in the southeastern North Atlantic basin. Linear ...

Michael A. Spall

1992-07-01T23:59:59.000Z

48

A Numerical Investigation of Several Factors Contributing to the Observed Variable Intensity of Deep Convection over South Florida  

Science Conference Proceedings (OSTI)

This study employs a revised version of the Colorado State University three-dimensional numerical cloud scale model to investigate the observed behavior of deep convection over South Florida on 17 July 1973. A brief description of recent model ...

Gregory J. Tripoli; William R. Cotton

1980-09-01T23:59:59.000Z

49

Retrieval of Thermal and Microphysical Variables in Observed Convective Storms. Part 1: Model Development and Preliminary Testing  

Science Conference Proceedings (OSTI)

The air flow in convective storms, the force that regulate the flow, and the processes that produce hydrometeors of various kinds are all being studied intensively by meteorologists using Doppler radar observations. The research reported here ...

Conrad L. Ziegler

1985-07-01T23:59:59.000Z

50

Sensitivity of Orographic Moist Convection to Landscape Variability: A Study of the Buffalo Creek, Colorado, Flash Flood Case of 1996  

Science Conference Proceedings (OSTI)

A number of numerical experiments with a high-resolution mesoscale model were conducted to study the convective rainfall event that caused the 1996 Buffalo Creek, Colorado, flash flood. Different surface conditions and treatments of land surface ...

Fei Chen; Thomas T. Warner; Kevin Manning

2001-11-01T23:59:59.000Z

51

The Influence of Horizontal Environmental Variability on Numerically Simulated Convective Storms. Part I: Variations in Vertical Shear  

Science Conference Proceedings (OSTI)

Severe convective storms are typically simulated using either an idealized, horizontally homogeneous environment (i.e., single sounding) or an inhomogeneous environment constructed using numerous types of observations. Representing opposite ends ...

Yvette P. Richardson; Kelvin K. Droegemeier; Robert P. Davies-Jones

2007-10-01T23:59:59.000Z

52

Evolution of the Vertical Mass Flux and Diagnosed Net Lateral Mixing in Isolated Convective Clouds  

Science Conference Proceedings (OSTI)

The evolution of the vertical mass flux in isolated cumulus and cumulus congestus clouds is documented using two King Airs during the Convection and Precipitation/Electrification Experiment (CaPE,), conducted in east-central Florida during the ...

Gary M. Barnes; James C. Fankhauser; Wesley D. Browning

1996-12-01T23:59:59.000Z

53

Natural Convection as a Heat Engine: A Theory for CAPE  

Science Conference Proceedings (OSTI)

On many planets there is a continuous heat supply to the surface and a continuous emission of infrared radiation to space by the atmosphere. Since the heat source is located at higher pressure than the heat sink, the system is capable of doing ...

Nilton O. Rennó; Andrew P. Ingersoll

1996-02-01T23:59:59.000Z

54

High-Resolution Simulation of Mean Convection and Its Intraseasonal Variability over the Tropics in the MRI/JMA 20-km Mesh AGCM  

Science Conference Proceedings (OSTI)

Tropical mean convection and its organization on different spatiotemporal scales in a simulation using the Meteorological Research Institute/Japan Meteorological Agency (MRI/JMA) global atmospheric general circulation model (AGCM) at 20-km ...

K. Rajendran; A. Kitoh; R. Mizuta; S. Sajani; T. Nakazawa

2008-08-01T23:59:59.000Z

55

Cape Wind Project | Open Energy Information  

Open Energy Info (EERE)

Cape Wind Project Cape Wind Project Jump to: navigation, search Name Cape Wind Project Facility Cape Wind Sector Wind energy Facility Type Offshore wind Facility Status Proposed Owner Cape Wind Developer Cape Wind Associates Energy Purchaser National Grid Location Nantucket Sound, MA Coordinates 41.501805°, -70.318333° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.501805,"lon":-70.318333,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

56

Propagating and Standing Components of the Intraseasonal Oscillationin Tropical Convection  

Science Conference Proceedings (OSTI)

Two questions related to the intraseasonal variability of tropical convection and circulation remain controversial. 1) To what degree is the convective component of the Madden–Julian oscillation (MJO) a standing oscillation? 2) Is the eastward ...

Chidong Zhang; Harry H. Hendon

1997-03-01T23:59:59.000Z

57

Thermodynamic Properties of Mesoscale Convective Systems Observed during BAMEX  

Science Conference Proceedings (OSTI)

Dropsonde observations from the Bow Echo and Mesoscale Convective Vortex Experiment (BAMEX) are used to document the spatiotemporal variability of temperature, moisture, and wind within mesoscale convective systems (MCSs). Onion-type sounding ...

James Correia Jr.; Raymond W. Arritt

2008-11-01T23:59:59.000Z

58

Sensitivity of Monthly Convective Precipitation to Environmental Conditions  

Science Conference Proceedings (OSTI)

Identifying dynamical and physical mechanisms controlling variability of convective precipitation is critical for predicting intraseasonal and longer-term changes in warm-season precipitation and convectively driven large-scale circulations. On a ...

Boksoon Myoung; John W. Nielsen-Gammon

2010-01-01T23:59:59.000Z

59

Cape Charles - STIP Minimum Sustainability Requirements (Virginia...  

Open Energy Info (EERE)

Share this page on Facebook icon Twitter icon Cape Charles - STIP Minimum Sustainability Requirements (Virginia) This is the approved revision of this page, as well as...

60

Convection towers  

DOE Patents (OSTI)

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.

Prueitt, Melvin L. (Los Alamos, NM)

1994-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "variable convection cape" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Convection towers  

DOE Patents (OSTI)

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.

Prueitt, M.L.

1996-01-16T23:59:59.000Z

62

Convection towers  

DOE Patents (OSTI)

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.

Prueitt, Melvin L. (Los Alamos, NM)

1996-01-01T23:59:59.000Z

63

Convection towers  

DOE Patents (OSTI)

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.

Prueitt, Melvin L. (Los Alamos, NM)

1995-01-01T23:59:59.000Z

64

Convection towers  

DOE Patents (OSTI)

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.

Prueitt, M.L.

1994-02-08T23:59:59.000Z

65

CONVECTION REACTOR  

DOE Patents (OSTI)

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.

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

1960-03-22T23:59:59.000Z

66

Cape Wind | Open Energy Information  

Open Energy Info (EERE)

Wind Wind Jump to: navigation, search Name Cape Wind Address 75 Arlington Street Place Boston, Massachusetts Zip 02116 Sector Wind energy Product Developing America's first offshore wind farm Website http://www.capewind.org/ Coordinates 42.3511372°, -71.0703224° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":42.3511372,"lon":-71.0703224,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

67

CT113-53 Cape Wind Report_  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

M M Report of the Effect on Radar Performance of the Proposed Cape Wind Project and Advance Copy of USCG Findings and Mitigation U.S. Department of the Interior Minerals Management Service MMS Cape Wind Energy Project January 2009 Final EIS Appendix M Report of the Effect on Radar Performance of the Proposed Cape Wind Project and Advance Copy of USCG Findings and Mitigation Technology Service Corporation an employee-owned company 55 Corporate Drive 3rd Floor, Trumbull, Connecticut 06611 Phone: (203) 268-1249 Fax: (203) 452-0260 www.tsc.com Ref: TSC-CT113-53 Report of the Effect on Radar Performance of the Proposed Cape Wind Project Submitted to the United States Coast Guard December 16, 2008 USCG Order #HSCG24-08-F-16A248

68

Convective heater  

DOE Patents (OSTI)

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.

Thorogood, R.M.

1983-12-27T23:59:59.000Z

69

Convective heater  

DOE Patents (OSTI)

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.

Thorogood, Robert M. (Macungie, PA)

1986-01-01T23:59:59.000Z

70

Convective heater  

DOE Patents (OSTI)

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.

Thorogood, Robert M. (Macungie, PA)

1983-01-01T23:59:59.000Z

71

Assimilation of Simulated Polarimetric Radar Data for a Convective Storm Using the Ensemble Kalman Filter. Part I: Observation Operators for Reflectivity and Polarimetric Variables  

Science Conference Proceedings (OSTI)

A radar simulator for polarimetric radar variables, including reflectivities at horizontal and vertical polarizations, the differential reflectivity, and the specific differential phase, has been developed. This simulator serves as a test bed for ...

Youngsun Jung; Guifu Zhang; Ming Xue

2008-06-01T23:59:59.000Z

72

Observations of Vertical Wind Shear Heterogeneity in Convective Boundary Layers  

Science Conference Proceedings (OSTI)

Dual-Doppler wind syntheses from mobile radar observations obtained during the International H2O Project document some of the spatial variability of vertical wind profiles in convective boundary layers. Much of the variability of popular ...

Paul Markowski; Yvette Richardson

2007-03-01T23:59:59.000Z

73

CALIFORNIA ASSOCIATION FOR POSTSECONDARY EDUCATION AND DISABILITY (CAPED)  

E-Print Network (OSTI)

CALIFORNIA ASSOCIATION FOR POSTSECONDARY EDUCATION AND DISABILITY (CAPED) 2012 STUDENT SCHOLARSHIPS. #12;CALIFORNIA ASSOCIATION ON POSTSECONDARY EDUCATION AND DISABILITY CAPED 2012 STUDENT SCHOLARSHIP California university/college. 6. PROOF OF CURRENT ENROLLMENT Criteria: Proof of enrollment in Fall 2012

74

Cape Peninsula University of Technology - Centre for Distributed...  

Open Energy Info (EERE)

en.openei.orgwindex.php?titleCapePeninsulaUniversityofTechnology-CentreforDistributedPowerandElectronicSystems&oldid677507" Categories: Research Institutions...

75

Cape Light Compact - Commercial, Industrial and Municipal Buildings...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Industrial and Municipal Buildings Energy Efficiency Rebate Program Cape Light Compact - Commercial, Industrial and Municipal Buildings Energy Efficiency Rebate Program...

76

Cape Verde: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Cape Verde: Energy Resources Cape Verde: Energy Resources (Redirected from ECOWAS Gateway-Cape Verde) Jump to: navigation, search Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"TERRAIN","zoom":5,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"390px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":16,"lon":-24,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

77

Cape Wind Associates LLC | Open Energy Information  

Open Energy Info (EERE)

LLC LLC Jump to: navigation, search Name Cape Wind Associates LLC Place Boston, Massachusetts Zip 2116 Sector Wind energy Product Cape Wind Associates is developing an offshore wind farm off the coast of Cape Cod in Massachussets, USA. Coordinates 42.358635°, -71.056699° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":42.358635,"lon":-71.056699,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

78

The 30–60-Day Convection Seesaw between the Tropical Indian and Western Pacific Oceans  

Science Conference Proceedings (OSTI)

The tropical Indian and western Pacific oceans are two prominent action centers for tropical 30–60-day convective variability. When convection is enhanced over the equatorial Indian Ocean, the tropical western Pacific often experiences an ...

Baozhen Zhu; Bin Wang

1993-01-01T23:59:59.000Z

79

The Vertical Structure of TOGA COARE Convection. Part II: Modulating Influences and Implications for Diabatic Heating  

Science Conference Proceedings (OSTI)

The temporal variability of western Pacific warm pool convection, especially its vertical structure, is examined in this study. Distributions of convective echo top heights and 30-dBZ contour heights have been produced from shipboard radar data ...

Charlotte A. DeMott; Steven A. Rutledge

1998-09-01T23:59:59.000Z

80

Using the Stochastic Multicloud Model to Improve Tropical Convective Parameterization: A Paradigm Example  

Science Conference Proceedings (OSTI)

Despite recent advances in supercomputing, current general circulation models (GCMs) poorly represent the variability associated with organized tropical convection. A stochastic multicloud convective parameterization based on three cloud types (...

Yevgeniy Frenkel; Andrew J. Majda; Boualem Khouider

2012-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "variable convection cape" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Cape Verde: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Cape Verde: Energy Resources Cape Verde: Energy Resources Jump to: navigation, search Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"TERRAIN","zoom":5,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"390px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":16,"lon":-24,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

82

Severe Convective Wind Environments  

Science Conference Proceedings (OSTI)

Nontornadic thunderstorm winds from long-lived, widespread convective windstorms can have a tremendous impact on human lives and property. To examine environments that support damaging wind producing convection, sounding parameters from Rapid ...

Evan L. Kuchera; Matthew D. Parker

2006-08-01T23:59:59.000Z

83

Supercritical Flow Interaction within the Cape Blanco–Cape Mendocino Orographic Complex  

Science Conference Proceedings (OSTI)

Supercritical flow interaction occurring in the marine boundary layer between closely spaced coastal capes is investigated with a mesoscale numerical prediction model. As an extension of previous work, the U.S. Navy’s Coupled Ocean/Atmosphere ...

Tracy Haack; Stephen D. Burk; Clive Dorman; David Rogers

2001-04-01T23:59:59.000Z

84

Inviscid Current Separation from Rounded Capes  

Science Conference Proceedings (OSTI)

Laboratory experiments have suggested that the separation of a coastal surface current from a cape of radius of curvature ? in a system rotating with Coriolis parameters f occurs when ? < u/f, where u is the characteristic flow speed of the ...

Barry A. Klinger

1994-08-01T23:59:59.000Z

85

Some Issues in Uncertainty Quantification and Parameter Tuning: A Case Study of Convective Parameterization Scheme in the WRF Regional Climate Model  

Science Conference Proceedings (OSTI)

The current tuning process of parameters in global climate models is often performed subjectively, or treated as an optimization procedure to minimize the difference between model fields and observations. The later approach may be generating a set of tunable parameters that approximate the observed climate but via an unrealistic balance of physical processes and/or compensating errors over different regions in the globe. In this study, we run the Weather Research and Forecasting (WRF) regional model constrained by the reanalysis data over the Southern Great Plains (SGP) where abundant observational data from various resources are available for calibration of the input parameters and validation of the model results. Our goal is to quantify the uncertainty ranges and identify the optimal values of five key input parameters in a new Kain-Frisch (KF) convective parameterization scheme incorporated in the WRF model. A stochastic sampling algorithm, Multiple Very Fast Simulated Annealing (MVFSA), is employed to efficiently sample the input parameters in KF scheme based on the skill score so that the algorithm progressively moves toward regions of the parameter space that minimize model errors. The results based on the WRF simulations with 25-km grid spacing over the SGP show that the model bias for precipitation can be significantly reduced by using five optimal parameters identified by the MVFSA algorithm. The model performance is very sensitive to downdraft and entrainment related parameters and consumption time of Convective Available Potential Energy (CAPE). Simulated convective precipitation decreases as the ratio of downdraft to updraft flux increases. Larger CAPE consumption time results in less convective but more stratiform precipitation. The simulation using optimal parameters obtained by only constraining precipitation generates positive impact on the other output variables, such as temperature and wind. By using the optimal parameters obtained at 25 km simulation, both the magnitude and spatial pattern of simulated precipitation are improved at 12-km spatial resolution. The optimal parameters identified from the SGP region have also improved the simulation of precipitation when moving model domain to another region with a different climate regime (i.e. North America monsoon region). These results suggest the improvement of precipitation simulation by using the optimal parameters remains when the model domain or spatial resolution is changed.

Yang, Ben; Qian, Yun; Lin, Guang; Leung, Lai-Yung R.; Zhang, Yaocun

2012-03-05T23:59:59.000Z

86

Cape Wind Energy Project - Final EIS  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

0 0 Environmental Impact Statement for the Proposed Cape Wind Energy Project Nantucket Sound, Offshore of Massachusetts Final Environmental Impact Statement U.S. Department of the Interior, MMS EIS-EA, OCS Publication No. 2008-040, OCS EIS/EA MMS 2010-11 and OCS EIS/EA BOEMRE 2011-024 Adopted as DOE/EIS-0470 U.S. Department of Energy December 2012 Page 1 of 3 Lead Federal Agency: U.S. Department of Energy Title: Final Environmental Impact Statement for the Proposed Cape Wind Energy Project, Nantucket Sound, Massachusetts (Adopted), DOE/EIS-0470 Contact: For additional copies or more information on this Final Environmental Impact Statement (EIS), please contact: Mr. Todd Stribley U.S. Department of Energy Loan Programs Office, LP-10

87

Forecasting the Maintenance of Quasi-Linear Mesoscale Convective Systems  

Science Conference Proceedings (OSTI)

The problem of forecasting the maintenance of mesoscale convective systems (MCSs) is investigated through an examination of observed proximity soundings. Furthermore, environmental variables that are statistically different between mature and ...

Michael C. Coniglio; Harold E. Brooks; Steven J. Weiss; Stephen F. Corfidi

2007-06-01T23:59:59.000Z

88

Two-Zone Convective Scaling of Diffusion in Complex Terrain  

Science Conference Proceedings (OSTI)

A “two-zone” convective scaling equation is developed that allows for a step change in scaling parameters. The results of the Lompoc Valley Diffusion Experiment, conducted at coastal site in California under variable cloud cover, are compared to ...

C. E. Skupniewicz

1994-05-01T23:59:59.000Z

89

The Diurnal Cycle of the Boundary Layer, Convection, Clouds, and Surface Radiation in a Coastal Monsoon Environment (Darwin, Australia)  

Science Conference Proceedings (OSTI)

The diurnal variation of convection and associated cloud and radiative properties remains a significant issue in global NWP and climate models. This study analyzes observed diurnal variability of convection in a coastal monsoonal environment ...

Peter T. May; Charles N. Long; Alain Protat

2012-08-01T23:59:59.000Z

90

Winds, Upwelling and Fog at Cape Cod Canal, Massachusetts  

Science Conference Proceedings (OSTI)

New observations confirm the formation of advective fogs over the western approaches to the Cape Cod Canal. The large air-water temperature differences required for the formation of these fogs are shown to occur when the colder Cape Cod Bay ...

Alfred H. Woodcock

1984-04-01T23:59:59.000Z

91

Cape Peninsula University of Technology - Centre for Distributed Power and  

Open Energy Info (EERE)

Peninsula University of Technology - Centre for Distributed Power and Peninsula University of Technology - Centre for Distributed Power and Electronic Systems Jump to: navigation, search Name Cape Peninsula University of Technology Address Symphony way, Bellville Place Cape Town, South Africa Zip 7535 Region Western cape Number of employees 11-50 Year founded 2004 Phone number +27219596563 Website http://www.cput.ac.za References Dr Atanda Raji[1] Prof. Kahn MTE[2] Dr Marco Adonis[3] Dr Wilfred Fritz[4] LinkedIn Connections This article is a stub. You can help OpenEI by expanding it. Cape Peninsula University of Technology - Centre for Distributed Power and Electronic Systems is a research institution based in Cape Town, South Africa. References ↑ "Dr Atanda Raji" ↑ "Prof. Kahn MTE" ↑ "Dr Marco Adonis"

92

Relationships between South Atlantic SST Variability and Atmospheric Circulation over the South African Region during Austral Winter  

Science Conference Proceedings (OSTI)

The Southwestern Cape (SWC) region of South Africa is characterized by winter rainfall brought mainly via cold fronts and by substantial interannual variability. Previous work has found evidence that the interannual variability in SWC winter ...

C. J. C. Reason; D. Jagadheesha

2005-08-01T23:59:59.000Z

93

Restratification after Deep Convection  

Science Conference Proceedings (OSTI)

An important, yet poorly understood, aspect of the water mass transformation process in the ocean is the manner in which the convected fluid, once formed, is accommodated and drawn into the general circulation. Following “violent mixing” in the ...

Helen Jones; John Marshall

1997-10-01T23:59:59.000Z

94

Cape Verde Archipelago Wind Farm | Open Energy Information  

Open Energy Info (EERE)

Archipelago Wind Farm Archipelago Wind Farm Jump to: navigation, search Name Cape Verde Archipelago Wind Farm Agency/Company /Organization African Development Bank Sector Energy Focus Area Renewable Energy, Wind Topics Finance, Market analysis, Background analysis Website http://www.europa-eu-un.org/ar Program Start 2010 Country Cape Verde UN Region Western Africa References Cape Verde Archipelago Wind Farm[1] Summary "The European Investment Bank (EIB) and African Development Bank (AfDB) agreed to provide EUR 45 million to design, build and operate onshore wind farms on four islands in the Cape Verde archipelago. This will be the first large scale wind project in Africa and the first renewable energy public private partnership in sub-Saharan Africa. The project will provide over 28MW of electricity generating capacity and help

95

Atmospheric Fluoroform (CHF3, HFC-23) at Cape Grim, Tasmania  

NLE Websites -- All DOE Office Websites (Extended Search)

CHF3, HFC-23 at Cape Grim, Tasmania CHF3, HFC-23 at Cape Grim, Tasmania Atmospheric Fluoroform (CHF3, HFC-23) at Cape Grim, Tasmania graphics Graphics data Data Authors D. E. Oram,1 W. T. Sturges,1 S. A. Penkett,1 A. McCulloch,2 and P. J. Fraser3 1School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, United Kingdom 2ICI Chemicals & Polymers Ltd., Safety and Environment Department, Runcorn, Cheshire, WA7 4QD, United Kingdom 3CRC for Southern Hemisphere Meteorology, Division of Atmospheric Research, Commonwealth Scientific and Industrial Research Organization, Private Bag No. 1, Aspendale, Victoria 3195, Australia Period of Record 1978-1995 Methods The sampling and analytical methods are described more fully in Oram et al. (1998). In summary, air samples were taken from the archive of Cape Grim,

96

Deep Convective Rotational Solitary Waves and Mesoscale Convective Complexes  

Science Conference Proceedings (OSTI)

As an extension of CCI (conditional convective instability) theory, three-dimensional, deep and steady convective waves in a barotropic basic flow with an embedded moist zone were studied via perturbation methods. The basic state is assumed to be ...

Qin Xu

1987-06-01T23:59:59.000Z

97

Ulrich Mans | Renewable Energy in Cape Town | 46th ISOCARP Congress 2010 African Cities and Renewable Energy: The Case of Cape Town,  

E-Print Network (OSTI)

Ulrich Mans | Renewable Energy in Cape Town | 46th ISOCARP Congress 2010 1 African Cities and Renewable Energy: The Case of Cape Town, South Africa Introduction: Urban Africa In the next two decades | Renewable Energy in Cape Town | 46th ISOCARP Congress 2010 2 electricity could present an opportunity

Geest, Harm G. van der

98

Cape Coral Youth Center Helps Light the Way to Energy Savings | Department  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Cape Coral Youth Center Helps Light the Way to Energy Savings Cape Coral Youth Center Helps Light the Way to Energy Savings Cape Coral Youth Center Helps Light the Way to Energy Savings May 18, 2011 - 4:32pm Addthis Cape Coral Youth Center Manager Mark Cagel stands in front of a tamper-proof thermostat at the Austen Youth Center in Cape Coral, Florida. | Photo Courtesy of the Cape Coral Youth Center Cape Coral Youth Center Manager Mark Cagel stands in front of a tamper-proof thermostat at the Austen Youth Center in Cape Coral, Florida. | Photo Courtesy of the Cape Coral Youth Center April Saylor April Saylor Former Digital Outreach Strategist, Office of Public Affairs What does this project do? Reduce the city's energy use by 40 percent over the next 15 years. Engineers able to research more efficient lighting techniques.

99

Cape Coral Youth Center Helps Light the Way to Energy Savings | Department  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Cape Coral Youth Center Helps Light the Way to Energy Savings Cape Coral Youth Center Helps Light the Way to Energy Savings Cape Coral Youth Center Helps Light the Way to Energy Savings May 18, 2011 - 4:32pm Addthis Cape Coral Youth Center Manager Mark Cagel stands in front of a tamper-proof thermostat at the Austen Youth Center in Cape Coral, Florida. | Photo Courtesy of the Cape Coral Youth Center Cape Coral Youth Center Manager Mark Cagel stands in front of a tamper-proof thermostat at the Austen Youth Center in Cape Coral, Florida. | Photo Courtesy of the Cape Coral Youth Center April Saylor April Saylor Former Digital Outreach Strategist, Office of Public Affairs What does this project do? Reduce the city's energy use by 40 percent over the next 15 years. Engineers able to research more efficient lighting techniques.

100

The Convective Storm Initiation Project  

Science Conference Proceedings (OSTI)

The Convective Storm Initiation Project (CSIP) is an international project to understand precisely where, when, and how convective clouds form and develop into showers in the mainly maritime environment of southern England. A major aim of CSIP is ...

Keith A. Browning; Cyril J. Morcrette; John Nicol; Alan M. Blyth; Lindsay J. Bennett; Barbara J. Brooks; John Marsham; Stephan D. Mobbs; Douglas J. Parker; Felicity Perry; Peter A. Clark; Sue P. Ballard; Mark A. Dixon; Richard M. Forbes; Humphrey W. Lean; Zhihong Li; Nigel M. Roberts; Ulrich Corsmeier; Christian Barthlott; Bernhard Deny; Norbert Kalthoff; Samiro Khodayar; Martin Kohler; Christoph Kottmeier; Stephan Kraut; Michael Kunz; Jürgen Lenfant; Andreas Wieser; Judith L. Agnew; Dave Bamber; James McGregor; Karl M. Beswick; Malcolm D. Gray; Emily Norton; Hugo M. A. Ricketts; Andrew Russell; Geraint Vaughan; Ann R. Webb; Mark Bitter; Thomas Feuerle; Rolf Hankers; Helmut Schulz; Karen E. Bozier; Chris G. Collier; Fay Davies; Catherine Gaffard; Tim J. Hewison; Darcy N. Ladd; Elizabeth C. Slack; Joe Waight; Markus Ramatschi; David P. Wareing; Robert J. Watson

2007-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "variable convection cape" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Convection Patterns in a Pond  

Science Conference Proceedings (OSTI)

Unusual convection patterns were observed in snow-slush an a pond in Seattle, Wash., during January 1980 and again during February 1981. The patterns are reminiscent of spoke-type convection discovered experimentally by Busse and Whitehead (1974)...

Kristina B. Katsaros

1981-10-01T23:59:59.000Z

102

NATURAL CONVECTION IN ROOM GEOMETRIES  

E-Print Network (OSTI)

that convective heat transfer processes are These computer~vective .part of the heat transfer process ? elng studled*of convect i ve heat transfer processes, the behavior of a

Gadgil, A.

2008-01-01T23:59:59.000Z

103

People and Places on the Outer Cape: A Landscape Character Study [2005 EDRA/Places Award -- Research  

E-Print Network (OSTI)

most townships of Cape Cod, produced by a interdisciplin-establishment of the Cape Cod National Sea- shore in 1961in Massachusetts, Cape Cod’s landscape has been transformed

Ahern, Jack; Carr, Ethan; Hamin, Elisabeth; Glassberg, David

2005-01-01T23:59:59.000Z

104

5, 1102911054, 2005 Convective gravity  

E-Print Network (OSTI)

ACPD 5, 11029­11054, 2005 Convective gravity waves at mid-latitudes Y. G. Choi et al. Title Page Discussions Wind-profiler observations of gravity waves produced by convection at mid-latitudes Y. G. Choi1­11054, 2005 Convective gravity waves at mid-latitudes Y. G. Choi et al. Title Page Abstract Introduction

Paris-Sud XI, Université de

105

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

E-Print Network (OSTI)

convection process and calculate convective heat transferthat convective heat transfer processes are highly dependentheat transfer process being studied* and

Gadgil, Ashok; Bauman, Fred; Kammerud, Ronald

2008-01-01T23:59:59.000Z

106

The Effect of Neglecting the Virtual Temperature Correction on CAPE Calculations  

Science Conference Proceedings (OSTI)

A simple theoretical analysis of the impact of neglecting the virtual correction on calculation of CAPE is made. This theory suggests that while ignoring the virtual correction does not introduce much error for large CAPE values, the relative ...

Charles A. Doswell III; Erik N. Rasmussen

1994-12-01T23:59:59.000Z

107

Interannual Variability of Deep-Water Formation in the Northwestern Mediterranean  

Science Conference Proceedings (OSTI)

In the Gulf of Lions, observations of deep convection have been sporadically carried out over the past three decades, showing significant interannual variability of convection activity. As long time series of meteorological observations of the ...

C. Mertens; F. Schott

1998-07-01T23:59:59.000Z

108

Cape Light Compact - Residential Energy Efficiency Rebate Program |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Cape Light Compact - Residential Energy Efficiency Rebate Program Cape Light Compact - Residential Energy Efficiency Rebate Program Cape Light Compact - Residential Energy Efficiency Rebate Program < Back Eligibility Residential Savings Category Heating & Cooling Commercial Heating & Cooling Heating Home Weatherization Commercial Weatherization Cooling Construction Design & Remodeling Sealing Your Home Ventilation Heat Pumps Windows, Doors, & Skylights Solar Water Heating Maximum Rebate Home Energy Assessment/Weatherization: $2,000 Income Eligible Weatherization Measures: $2,000 - $3,000 Program Info State Massachusetts Program Type Local Rebate Program Rebate Amount Home Energy Assessment/Weatherization: 75% Single Family Energy Star Home: $750 - $8,000 Multi-Family Energy Star Home: $350 - $4,000/unit Income Eligible Weatherization Measures: 100% of cost

109

Cape Cod Regional Transit Authority | Open Energy Information  

Open Energy Info (EERE)

Cod Regional Transit Authority Cod Regional Transit Authority Jump to: navigation, search Name Cape Cod Regional Transit Authority Facility Cape Cod Regional Transit Authority Sector Wind energy Facility Type Small Scale Wind Facility Status In Service Owner Sustainable Energy Development Energy Purchaser Cape Cod Regional Transit Authority Location Hyannis MA Coordinates 41.69005134°, -70.14437914° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.69005134,"lon":-70.14437914,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

110

FUPWG Meeting Agenda - Cape Canaveral, FL | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Cape Canaveral, FL Cape Canaveral, FL FUPWG Meeting Agenda - Cape Canaveral, FL October 7, 2013 - 3:00pm Addthis FUPWG Spring 2007 - Cocoa Beach, FL: Launching a New Era of Energy Efficiency" Hosted by: Florida Power and Light Company logo FEMP logo May 1-2, 2007 Hosted by Florida Power and Light Company Monday, April 30, 2007 5:00 - 6:30 Steering Committee meeting at Skylab/Atlas Conference Room, Doubletree Hotel 6:30 until... Networking dinner at 3 Wishes Restaurant, Doubletree Hotel Tuesday, May 1, 2007 7:45 - 8:30 Registration/Continental Breakfast 8:30 - 8:45 Florida Power & Light Welcome Marlene Santos, FPL Vice President of Customer Service 8:45 - 9:00 FEMP Welcome David McAndrew, FEMP 9:00 - 9:30 Washington Update David McAndrew, FEMP National Defense 2007 Authorization

111

Cape Light Compact - Commercial, Industrial and Municipal Buildings Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Cape Light Compact - Commercial, Industrial and Municipal Buildings Cape Light Compact - Commercial, Industrial and Municipal Buildings Energy Efficiency Rebate Program Cape Light Compact - Commercial, Industrial and Municipal Buildings Energy Efficiency Rebate Program < Back Eligibility Commercial Industrial Local Government Savings Category Heating & Cooling Commercial Heating & Cooling Heating Cooling Manufacturing Other Construction Heat Pumps Appliances & Electronics Commercial Lighting Lighting Commercial Weatherization Water Heating Maximum Rebate Retrofit: 50% of cost of upgraded equipment, or an amount that buys down the cost of the project to a 1.5 year simple payback. New Construction: 70% of incremental cost of higher efficiency equipment, or an amount that buys down the incremental investment to a 1.5 year simple

112

The convective structures associated with cloud-to-ground lightning in TOGA COARE Mesoscale Convective Systems  

E-Print Network (OSTI)

The TOGA COARE experiment was carried out in the western Pacific warm pool region from November 1992 through February 1993. Data from TOGA COARE provide the opportunity for comprehensive studies of tropical oceanic convection. This study seeks to understand more about the structures of tropical mesoscale convective systems in relation to their lightning activity and cold cloud area. The properties of convective cores within the MCSs, as well as their infrared (IR) cloud top temperatures are related to cloud-to-ground lightning. IR and lightning time histories for each case are compared, and the cases ranked by mean flashes per 10000 km2. For selected cases, radar/lightning overlays and vertical profiles of maximum radar reflectivities (VPRRs) are shown in order to describe the convective structures of cells that produced lightning, and also cells that did not produce lightning. IR cloud-top temperature and lightning histories indicate the highly variable nature of the TOGA COARE MCSs. Some MCSs which have very cold cloud-top temperatures have little or no lightning. When a system did produce lightning, more flashes generally occurred during its growth phase. Overall, IR measurements seem to be a poor indicator of lightning due to the lack of a clear relationship between the size of cold cloud-top area and cloud-to-ground flashes. The overall flash rates of the TOGA COARE MCSs support previous work which showed that tropical oceanic convection has an order of magnitude less cloud-to-ground lightning than continental convection. In fact, the highest flash rate for the 13 cases was less than the weakest continental case in a Texas MCS study (Toracinta et al. 1995). Examination of individual VPRR and of all convective VPRR from the 13 cases indicate a pronounced difference between lightning producing and non-lightning producing cells. Lightning producing convective cells have higher radar reflectivity in the 5.0- 8.0 km layer, and a slower decrease with height, both observations indicating larger ice particles in the mixed phase region between 00 C and-200 C.

Restivo, Michael Edward

1995-01-01T23:59:59.000Z

113

Convective Modifications of a Geostrophic Eddy Field  

Science Conference Proceedings (OSTI)

Ocean convection often occurs in regions of mesoscale eddy activity, where convective mixing and geostrophic eddy dynamics interact. The authors examine the interactions between a group of geostrophic eddies and convective mixing induced by ...

Sonya Legg; James C. McWilliams

2001-04-01T23:59:59.000Z

114

Tropical Convection on 7–21-Day Timescales over the Western Pacific  

Science Conference Proceedings (OSTI)

Evidence is presented to demonstrate that the oscillations of convection on 7–21-day timescales are an important component of the intraseasonal variability over the region spanning the equatorial western Pacific to the subtropical South Pacific. ...

Jon M. Schrage; Dayton G. Vincent

1996-03-01T23:59:59.000Z

115

Verification of Convection-Allowing WRF Model Forecasts of the Planetary Boundary Layer Using Sounding Observations  

Science Conference Proceedings (OSTI)

This study evaluates forecasts of thermodynamic variables from five convection-allowing configurations of the Weather Research and Forecasting Model (WRF) with the Advanced Research core (WRF-ARW). The forecasts vary only in their planetary ...

Michael C. Coniglio; James Correia Jr.; Patrick T. Marsh; Fanyou Kong

2013-06-01T23:59:59.000Z

116

A Sensitivity Study of Convective Cloud Formation by Vegetation Forcing with Different Atmospheric Conditions  

Science Conference Proceedings (OSTI)

Variable vegetation cover is a possible trigger for convection, especially in semiarid areas due to differential surface forcing. A two-dimensional numerical model with explicit cloud physics and a detailed vegetation parameterization scheme is ...

Xiaodong Hong; Martin J. Leach; Sethu Raman

1995-09-01T23:59:59.000Z

117

Vertical Transports by Plumes within the Moderately Convective Marine Atmospheric Surface Layer  

Science Conference Proceedings (OSTI)

Bursts in the kinematic vertical transports of heat and horizontal momentum in a moderately convective marine atmospheric surface layer are studied by applying the variable interval time averaging (VITA) detection method to principal components ...

Richard A. Mason; Hampton N. Shirer; Robert Wells; George S. Young

2002-04-01T23:59:59.000Z

118

Comparison of Modeled and Observed Accumulated Convective Precipitation in Mountainous and Flat Land Areas  

Science Conference Proceedings (OSTI)

Convective precipitation is the main cause of extreme rainfall events in small areas. Its primary characteristics are both large spatial and temporal variability. For this reason, the monitoring of accumulated precipitation fields (liquid and ...

Mladjen ?uri?; Dejan Janc

2011-04-01T23:59:59.000Z

119

Interactions between a Developing Mesoscale Convective System and Its Environment. Part II: Numerical Simulation  

Science Conference Proceedings (OSTI)

The 19 July 1993 mesoscale convective system (MCS), discussed in Part I, was simulated using the Regional Atmospheric Modeling System (RAMS). The model was initialized with variable physiographic and atmospheric data with the goal of reproducing ...

Jason E. Nachamkin; William R. Cotton

2000-05-01T23:59:59.000Z

120

Polarimetric Radar Observations of Convection in Northwestern Mexico during the North American Monsoon Experiment  

Science Conference Proceedings (OSTI)

The spatial and temporal variability of convection during the North American Monsoon Experiment (NAME) was examined via analysis of three-dimensional polarimetric radar data. Terrain bands were defined as the Gulf of California (over water) and ...

Timothy J. Lang; Steven A. Rutledge; Robert Cifelli

2010-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "variable convection cape" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Seasonal Evolution of the Upwelling Process South of Cape Blanco  

Science Conference Proceedings (OSTI)

Bursts of upwelling-favorable winds lasting 4–20 days occur year-round south of Cape Blanco, a major headland on the Oregon coast. The ocean’s response to these events was studied using moored current, temperature, and salinity data; satellite ...

Steven R. Ramp; Frederick L. Bahr

2008-01-01T23:59:59.000Z

122

Intraseasonal Variability over Tropical Africa during Northern Summer  

Science Conference Proceedings (OSTI)

The intraseasonal variability over Africa during northern summer was analyzed, using 25 years of NCEP– NCAR reanalysis and satellite data. The dominant pattern of variability was one of enhanced deep convection over the whole African monsoon ...

Adrian J. Matthews

2004-06-01T23:59:59.000Z

123

Improving Convective Parameterization Using ARM Data  

NLE Websites -- All DOE Office Websites (Extended Search)

Convective Parameterization Using ARM Data G. J. Zhang Center for Atmospheric Sciences Scripps Institution of Oceanography La Jolla, California Introduction Convective...

124

The Effects of Aerosols on Intense Convective Precipitation in the Northeastern U.S.  

SciTech Connect

A fully coupled meteorology-chemistry-aerosol mesoscale model (WRF-Chem) is used to assess the effects of aerosols on intense convective precipitation over the northeastern United States. Numerical experiments are performed for three intense convective storm days and for two scenarios representing “typical” and “low” aerosol conditions. The results of the simulations suggest that increasing concentrations of aerosols can lead to either enhancement or suppression of precipitation. Quantification of the aerosol effect is sensitive to the metric used due to a shift of rainfall accumulation distribution when realistic aerosol concentrations are included in the simulations. Maximum rainfall accumulation amounts and areas with rainfall accumulations exceeding specified thresholds provide robust metrics of the aerosol effect on convective precipitation. Storms developing over areas with medium to low aerosol concentrations showed a suppression effect on rainfall independent of the meteorologic environment. Storms developing in areas of relatively high particulate concentrations showed enhancement of rainfall when there were simultaneous high values of CAPE, relative humidity and wind shear. In these cases, elevated aerosol concentrations resulted in stronger updrafts and downdrafts and more coherent organization of convection. For the extreme case, maximum rainfall accumulation differences exceeded 40 mm. The modeling results suggest that areas of the northeastern U.S. urban corridor that are close or downwind of intense sources of aerosols, could be more favorable for rainfall enhancement due to aerosols for the aerosol concentrations typical of this area.

Ntelekos, Alexandros A.; Smith, James S.; Donner, Leo J.; Fast, Jerome D.; Gustafson, William I.; Chapman, Elaine G.; Krajewski, Witold F.

2009-08-03T23:59:59.000Z

125

Liquid convective diodes  

DOE Green Energy (OSTI)

Liquid convective diodes are analyzed by experiments and theory. The experiments include flow visualization and temperature measurements. The dynamic behavior of a diode is analyzed and explained. Performance of three diodes of different designs that were installed in a test cell this past winter showed an average 50% thermal efficiency over a three-month period. If only the performance of the most efficient diode among the three is considered, it is expected that this figure may be increased to 60% or possibly 65% with some design improvements. A simple analytical model, which was developed earlier, is discussed. A comparison of reservoir temperatures from one of the test cell diodes with predicted temperatures from the model showed excellent agreement. The good agreement indicates that the model contains the elements that are necessary to accurately predict site-specific diode performance.

Jones, G.F.

1984-01-01T23:59:59.000Z

126

Interannual variability of monsoon precipitation and local subcloud equivalent potential"! temperature#!  

E-Print Network (OSTI)

! "! Interannual variability of monsoon precipitation and local subcloud equivalent potential.hurley@yale.edu"&! "'! Keywords: monsoon, interannual variability, convective quasi-equilibrium, equivalent potential"(! temperature")! #12;! #! ABSTRACT"*! The interannual variability of monsoon precipitation is described

127

A Numerical Simulation of Convectively Induced Turbulence above Deep Convection  

Science Conference Proceedings (OSTI)

At 1034 UTC 2 September 2007, a commercial aircraft flying from Jeju, South Korea, to Osaka, Japan, at an altitude of approximately 11.2 km encountered severe turbulence above deep convection. To investigate the characteristics and generation ...

Jung-Hoon Kim; Hye-Yeong Chun

2012-06-01T23:59:59.000Z

128

Convection in pulsating stars. II. RR Lyrae convection and stability  

Science Conference Proceedings (OSTI)

Convective model envelopes of two RR Lyrae stars are constructed, one centrally located in the instability strip, and one just beyond the red edge of the stip. Steady state solutions and small amplitude oscillations are studied using a nonlinear pulsation code. We find that convection has only a small effect on the stability of the hotter model, primarily due to turbulent pressure work (net driving) in the hydrogen ionization zone. The cooler model, however, shows strong reduction in both hydrogen and helium ionization driving, which quenches the pulsation. This effect is not directly attributable to convective PdV work, but probably reflects changes in structure and phase relations in the envelope due to convection.

Stellingwerf, R.F.

1982-11-01T23:59:59.000Z

129

Idealized Mesoscale Convective System Structure and Propagation Using Convective Parameterization  

Science Conference Proceedings (OSTI)

The development and propagation of mesoscale convective systems (MCSs) was examined within the Weather Research and Forecasting (WRF) model using the Kain–Fritsch (KF) cumulus parameterization scheme and a modified version of this scheme. ...

James Correia Jr.; Raymond W. Arritt; Christopher J. Anderson

2008-07-01T23:59:59.000Z

130

Heat distribution by natural convection  

DOE Green Energy (OSTI)

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.

Balcomb, J.D.; Yamaguchi, K.

1983-01-01T23:59:59.000Z

131

Cape Elizabeth, Maine: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Cape Elizabeth, Maine: Energy Resources Cape Elizabeth, Maine: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 43.563696°, -70.2000467° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":43.563696,"lon":-70.2000467,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

132

MHK Projects/Cape May Tidal Energy | Open Energy Information  

Open Energy Info (EERE)

Cape May Tidal Energy Cape May Tidal Energy < MHK Projects Jump to: navigation, search << Return to the MHK database homepage Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":5,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"500px","height":"350px","centre":false,"title":"","label":"","icon":"File:Aquamarine-marker.png","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":38.9668,"lon":-74.963,"alt":0,"address":"","icon":"http:\/\/prod-http-80-800498448.us-east-1.elb.amazonaws.com\/w\/images\/7\/74\/Aquamarine-marker.png","group":"","inlineLabel":"","visitedicon":""}]}

133

EIS-0470: U.S. Department of Energy Loan Guarantee for the Cape Wind Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

0: U.S. Department of Energy Loan Guarantee for the Cape 0: U.S. Department of Energy Loan Guarantee for the Cape Wind Energy Project on the Outer Continental Shelf off Massachusetts, Nantucket Sound EIS-0470: U.S. Department of Energy Loan Guarantee for the Cape Wind Energy Project on the Outer Continental Shelf off Massachusetts, Nantucket Sound Summary The DOE Loan Programs Office is proposing to offer a loan guarantee to Cape Wind Associates, LLC for the construction and start-up of the Cape Wind Energy Project in Nantucket Sound, offshore of Massachusetts. The proposed Cape Wind Energy Project would consist of up to 130, 3.6-MW turbine generators, in an area of roughly 25-square miles, and would include 12.5 miles of 115-kilovolt submarine transmission cable and an electric service platform. To inform DOE's decision regarding a loan guarantee, DOE adopted

134

Geographic variation in breeding seasonality and primary moult parameters in Cape Weavers, Southern Masked  

E-Print Network (OSTI)

Cape, while MacDonald (1990) investigated its expansion westwards through the Karoo. Oschadleus et al species in the arid regions, i.e. the Karoo (2.7­6.5 months) and Northern Cape (1.4­4.6). Peak egg and Southern Masked Weavers in the Eastern Cape, Karoo, KwaZulu-Natal and former Transvaal, with the maximum

de Villiers, Marienne

135

Self-reported chemicals exposure, beliefs about disease causation, and risk of breast cancer in the Cape Cod Breast Cancer and Environment Study: a case-control study  

E-Print Network (OSTI)

2&1&0&1&6&0]. 34. Cape Cod Breast Cancer and the EnvironmentSpring Institute: Cape Cod Breast Cancer and Environmentbetween residence on Cape Cod, Massachusetts, and breast

Zota, Ami R; Aschengrau, Ann; Rudel, Ruthann A; Brody, Julia

2010-01-01T23:59:59.000Z

136

The Transition to Strong Convection  

Science Conference Proceedings (OSTI)

Recent work has shown that observations of tropical precipitation conform to properties associated with critical phenomena in other systems. Here some of these universal properties are used to probe the physics of tropical convection empirically, ...

J. David Neelin; Ole Peters; Katrina Hales

2009-08-01T23:59:59.000Z

137

Mesoscale Convective Complexes in Africa  

Science Conference Proceedings (OSTI)

Digitized full-disk infrared satellite imagery from the European geostationary satellite (Meteosat) for 1986 and 1987 was used to construct a climatology of mesoscale convective complexes (MCCs) in Africa One hundred ninety-five systems formed ...

Arlene G. Laing; J. Michael Fritsch

1993-08-01T23:59:59.000Z

138

Isentropic Analysis of Convective Motions  

Science Conference Proceedings (OSTI)

This paper analyzes the convective mass transport by sorting air parcels in terms of their equivalent potential temperature to determine an isentropic streamfunction. By averaging the vertical mass flux at a constant value of the equivalent ...

Olivier M. Pauluis; Agnieszka A. Mrowiec

2013-11-01T23:59:59.000Z

139

Integral Effects of Deep Convection  

Science Conference Proceedings (OSTI)

The large-scale, integral effect of convective elements (plumes) constituting an open-ocean chimney is investigated both theoretically and with a plume-resolving numerical model. The authors consider an initially homogeneous “patch” of ocean of ...

Uwe Send; John Marshall

1995-05-01T23:59:59.000Z

140

The Decay of Convective Turbulence  

Science Conference Proceedings (OSTI)

Using simulations with a large-eddy model we have studied the decay of convective turbulence in the atmospheric boundary layer when the upward surface sensible heat flux is suddenly stopped. The decay of turbulent kinetic energy and temperature ...

F. T. M. Nieuwstadt; R. A. Brost

1986-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "variable convection cape" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

The Diurnal Cycle of the Boundary Layer, Convection, Clouds, and Surface Radiation in a Coastal Monsoon Environment (Darwin, Australia)  

E-Print Network (OSTI)

Monsoon Environment (Darwin, Australia) PETER T. MAY Centre for Australian Weather and Climate Research variability of convection in a coastal monsoonal environment examining the interaction of convective rain Measurement (ARM) program. Both active monsoonal and large-scale suppressed (buildup and break) conditions

Protat, Alain

142

A Probabilistic Bulk Model of Coupled Mixed Layer and Convection. Part II: Shallow Convection Case  

Science Conference Proceedings (OSTI)

The probabilistic bulk convection model (PBCM) developed in a companion paper is here extended to shallow nonprecipitating convection. The PBCM unifies the clear-sky and shallow convection boundary layer regimes by obtaining mixed-layer growth, ...

Pierre Gentine; Alan K. Betts; Benjamin R. Lintner; Kirsten L. Findell; Chiel C. van Heerwaarden; Fabio D’Andrea

2013-06-01T23:59:59.000Z

143

The Impacts of Convective Parameterization and Moisture Triggering on AGCM-Simulated Convectively Coupled Equatorial Waves  

Science Conference Proceedings (OSTI)

This study examines the impacts of convective parameterization and moisture convective trigger on convectively coupled equatorial waves simulated by the Seoul National University (SNU) atmospheric general circulation model (AGCM). Three different ...

Jia-Lin Lin; Myong-In Lee; Daehyun Kim; In-Sik Kang; Dargan M. W. Frierson

2008-03-01T23:59:59.000Z

144

Evaluation of Drug Management of Essential Hypertension in the University of Cape Coast Hospital, Ghana.  

E-Print Network (OSTI)

??Hypertension and hypertension-related admissions, complications and death showed an increasing incidence and increasing rate respectively between 2004 and 2006 in the University of Cape Coast… (more)

Kizzie-Hayford Arimathea, Joseph

2010-01-01T23:59:59.000Z

145

Renewable energy strategies for low cost housing in South Africa : case studies from Cape Town.  

E-Print Network (OSTI)

??This dissertation explores renewable energy strategies for low-income housing in South Africa using several case studies from the City of Cape Town and surrounding areas.… (more)

Dubbeld, Catherine Elizabeth.

2007-01-01T23:59:59.000Z

146

Convective heat flow probe  

DOE Patents (OSTI)

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.

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

1984-01-09T23:59:59.000Z

147

The MJO and Convectively Coupled Waves in a Coarse-Resolution GCM with a Simple Multicloud Parameterization  

Science Conference Proceedings (OSTI)

The adequate representation of the dominant intraseasonal and synoptic-scale variability in the tropics, characterized by the Madden–Julian oscillation (MJO) and convectively coupled waves, is still problematic in current operational general ...

Boualem Khouider; Amik St-Cyr; Andrew J. Majda; Joseph Tribbia

2011-02-01T23:59:59.000Z

148

Sensitivity of Tropical Pacific Convection to Dry Layers at Mid- to Upper Levels: Simulation and Parameterization Tests  

Science Conference Proceedings (OSTI)

Numerical forecast experiments are carried out to investigate the implications of observed moisture variability in the tropical Pacific for deep convection. The study uses a series of quasi-cloud-resolving model forecasts with a triple-nested ...

James A. Ridout

2002-12-01T23:59:59.000Z

149

Convection-Allowing and Convection-Parameterizing Ensemble Forecasts of a Mesoscale Convective Vortex and Associated Severe Weather Environment  

Science Conference Proceedings (OSTI)

An analysis of a regional severe weather outbreak that was related to a mesoscale convective vortex (MCV) is performed. The MCV-spawning mesoscale convection system (MCS) formed in northwest Kansas along the southern periphery of a large cutoff ...

Adam J. Clark; William A. Gallus Jr.; Ming Xue; Fanyou Kong

2010-08-01T23:59:59.000Z

150

ARM - Midlatitude Continental Convective Clouds  

Science Conference Proceedings (OSTI)

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.

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

2012-01-19T23:59:59.000Z

151

ARM - Midlatitude Continental Convective Clouds  

DOE Data Explorer (OSTI)

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.

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

152

University of Cape Town-Energy Research Centre | Open Energy Information  

Open Energy Info (EERE)

Town-Energy Research Centre Town-Energy Research Centre Jump to: navigation, search Logo: University of Cape Town-Energy Research Centre Name University of Cape Town-Energy Research Centre Address Energy Research Centre Room 6.46 6th Floor Menzies Building (Via 5th floor) Upper Campus University of Cape Town Rondebosch Cape Town Place Cape Town, South Africa Website http://www.erc.uct.ac.za/index References http://www.erc.uct.ac.za/index.htm No information has been entered for this organization. Add Organization "The Centre is an African-based multi-disciplinary energy research centre which pursues excellence in technology, policy and sustainable development research, education and capacity building programmes at a local and international level. The organisation's core activity is energy. Under the umbrella of this

153

Convectively Coupled Waves in a Sheared Environment  

Science Conference Proceedings (OSTI)

A linear stability analysis, about a radiative–convective equilibrium in a sheared environment, on an equatorial beta plane, for a simple multicloud model for organized tropical convection is presented here. Both vertical/baroclinic and ...

Ying Han; Boualem Khouider

2010-09-01T23:59:59.000Z

154

Organizational Modes of Midlatitude Mesoscale Convective Systems  

Science Conference Proceedings (OSTI)

This paper discusses common modes of mesoscale convective organization. Using 2-km national composite reflectivity data, the authors investigated linear mesoscale convective systems (MCSs) that occurred in the central United States during May ...

Matthew D. Parker; Richard H. Johnson

2000-10-01T23:59:59.000Z

155

Predicting the Movement of Mesoscale Convective Complexes  

Science Conference Proceedings (OSTI)

A procedure for operationally predicting the movement of the mesobeta-scale convective elements responsible for the heavy rain in mesocale convective complexes is presented. The procedure is based on the well-known concepts that the motion of ...

S. F. Corfidi; J. H. Meritt; J. M. Fritsch

1996-03-01T23:59:59.000Z

156

Helicity and Thermal Convection with Shear  

Science Conference Proceedings (OSTI)

The relations between nonlinear energy transport and helicity of the flow are studied through simulations of thermal convection with mean shear. Parallel-plate convection with a rotating mean shear, a linear undirectional shear, a parabolic ...

Wan-Shu Wu; Douglas K. Lilly; Robert M. Kerr

1992-10-01T23:59:59.000Z

157

Preconditioning Deep Convection with Cumulus Congestus  

Science Conference Proceedings (OSTI)

Recent studies have pushed forward the idea that congestus clouds, through their moistening of the atmosphere, could promote deep convection. On the other hand, older studies have tended to relate convective initiation to the large-scale forcing. ...

Cathy Hohenegger; Bjorn Stevens

2013-02-01T23:59:59.000Z

158

A Transilient Matrix for Moist Convection  

Science Conference Proceedings (OSTI)

A method is introduced for diagnosing a transilient matrix for moist convection. This transilient matrix quantifies the nonlocal transport of air by convective eddies: for every height z, it gives the distribution of starting heights z? for the ...

David M. Romps; Zhiming Kuang

2011-09-01T23:59:59.000Z

159

Midlatitude Continental Convective Clouds Experiment (MC3E)  

SciTech Connect

Convective processes play a critical role in the Earth’s 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 Earth’s 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 April–May 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 Administration’s (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. Several different components of convective cloud and precipitation processes tangible to both the convective parameterization and precipitation retrieval algorithm problem are targeted, such as preconvective environment and convective initiation, updraft/downdraft dynamics, condensate transport and detrainment, precipitation and cloud microphysics, spatial and temporal variability of precipitation, influence on the environment and radiation, and a detailed description of the large-scale forcing.

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

2010-04-01T23:59:59.000Z

160

A numerical simulation of slantwise convection: its structure and evolution  

E-Print Network (OSTI)

Weather forecasters have had difficulty forecasting mesoscale precipitation bands occurring in the regions of frontal zones. Within the last twenty years, slantwise convection (SC) through the release of conditional symmetric instability (CSI) has gained more acceptance as the cause of the rainbands under certain conditions. Bennetts and Hoskins (1979) predict that under saturated conditions, CSI would be released, forming slantwise roll circulations with sloping updrafts and downdrafts (slantwise convection), and could be a possible explanation for frontal rainbands. This study uses the Penn State/NCAR Mesoscale Model (MM5) as a diagnostic tool to simulate a slantwise convective case from the Genesis of Atlantic Lows Experiment (GALE, Dirks et al. 1988) intensive observing period 1 (IOP1, 18 January 1986 to 20 January 1986). The model results show that SC formed in an 'upscale' development as suggested by Xu (1986) with SC dominating over upright convection. The results showed that in SC's development stage, the beginning of a roll circulation with a slanted updraft and a broad downdraft with a rear inflow jet. SC in its mature stage exhibits a well developed roll circulation, a 3-dimensional structure with along-line variability, stages of re-development suggesting a quasi-steady state, and the non-conservation of negative equivalent potential vorticity (-EPV). Eventually, SC decays as it can no longer generate CSI for release. The SC compared well with other SC bands in the event and showed similar structure as observed in radar data.

Overpeck, Scott Allen

2001-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "variable convection cape" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

A transilient matrix for moist convection  

SciTech Connect

A method is introduced for diagnosing a transilient matrix for moist convection. This transilient matrix quantifies the nonlocal transport of air by convective eddies: for every height z, it gives the distribution of starting heights z{prime} for the eddies that arrive at z. In a cloud-resolving simulation of deep convection, the transilient matrix shows that two-thirds of the subcloud air convecting into the free troposphere originates from within 100 m of the surface. This finding clarifies which initial height to use when calculating convective available potential energy from soundings of the tropical troposphere.

Romps, D.; Kuang, Z.

2011-08-15T23:59:59.000Z

162

Regional Variability in Tropical Convection: Observations from TRMM  

Science Conference Proceedings (OSTI)

Observation of the vertical profile of precipitation over the global Tropics is a key objective of the Tropical Rainfall Measuring Mission (TRMM) because this information is central to obtaining vertical profiles of latent heating. This study ...

Walter A. Petersen; Steven A. Rutledge

2001-09-01T23:59:59.000Z

163

Properties of tropical convection observed by ARM millimeter-radars  

NLE Websites -- All DOE Office Websites (Extended Search)

Properties of tropical convection observed by ARM millimeter-radars 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 cloud classes according to the radar reflectivity structures of these cloud systems, associated rainfall, and surface radiative properties. These observations of cloud properties are composited with respect to various phases of the Madden Julian Oscillation, which is a dominant mode of variability at Manus Island. A method of better

164

EIS-0470 - Cape Wind Energy Project - 2010 - Environmental Assessment  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Wind Energy Project Wind Energy Project Environmental Assessment April 28, 2010 4 OCS EIS/EA MMS 2010-011 FINDING OF NO NEW SI GNIFICANT IMPACT (FO:NNSJ) Issuance of Lease for Offshore Wind Power Facility in Nantucket Sound, Offshore Massachusetts In January 2009, the U.S. Department of the Interior, Minerals Management Service (MMS) prepared and filed with the U.S. Environmental Protection Agency (USEP A) a Final Environmental Impact Statement (FEIS) covering the construction, operation, and decommissioning of the proposed Cape Wind Energy Project, an offshore wind power facility consisting of 130, 3.6± megawatt (MW) wind turbine generators (WTGs), each with a maximum blade height of 440 feet, to be arranged in a grid pattern on the Outer Continental Shelf (OCS) in

165

Cape Hatteras Elec Member Corp | Open Energy Information  

Open Energy Info (EERE)

Hatteras Elec Member Corp Hatteras Elec Member Corp Jump to: navigation, search Name Cape Hatteras Elec Member Corp Place North Carolina Utility Id 2982 Utility Location Yes Ownership C NERC Location SERC NERC SERC Yes Activity Transmission Yes Activity Distribution Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png Commercial Lighting and Power Commercial Industrial Lighting and Power Industrial Schedule A - RESIDENTIAL SERVICE Residential Security Light - 100 watt HPS Lighting Security Light - 1000 watt HPS Lighting Security Light - 175 watt MV Lighting Security Light - 250 watt HPS Lighting

166

Atmospheric Methane at Cape Meares, Oregon, U.S.A.: A High-Resolution Data  

NLE Websites -- All DOE Office Websites (Extended Search)

Atmospheric Trace Gases » Methane » Atmospheric Trace Gases » Methane » Atmospheric Methane, Cape Meares Atmospheric Methane at Cape Meares, Oregon, U.S.A.: A High-Resolution Data Base for the Period 1979-1992 DOI: 10.3334/CDIAC/atg.db1007 data Data (DB1007) Investigators M. A. K. Khalil and R. A. Rasmussen Description This data base presents continuous automated atmospheric methane (CH4) measurements taken at the atmospheric monitoring facility in Cape Meares, Oregon, by the Oregon Graduate Institute of Science and Technology. The Cape Meares data represent some 119,000 individual atmospheric methane measurements carried out during 1979-1992. Analysis of ambient air (collected 12 to 72 times daily) was carried out by means of an automated sampling and measurement system, using the method of gas chromatography and

167

Coastal Countercurrent and Mesoscale Eddy Formation by Tidal Rectification near an Oceanic Cape  

Science Conference Proceedings (OSTI)

Cape St. James is an extensive triangular-shaped promontory located in a tidally energetic region at the southern tip of the Queen Charlotte Islands approximately 150 km off the mainland coast or British Columbia. Several years of oceanographic ...

Richard E. Thomson; Robert E. Wilson

1987-11-01T23:59:59.000Z

168

In Situ Delta-13 CO2 from Cape Grim, Tasmania, Australia: 1982-1993  

NLE Websites -- All DOE Office Websites (Extended Search)

In Situ δ13CO2 from Cape In Situ δ13CO2 from Cape Grim, Australia In Situ δ13CO2 from Cape Grim, Tasmania, Australia: 1982-1993 graphics Graphics data Data Investigators R.J. Francey and C.E. Allison CSIRO, Division of Atmospheric Research, Private Bag No. 1, Mordialloc, Victoria, Australia 3195 Period of Record 1982-1993 Methods Air samples are collected during baseline condition episodes at a frequency of around one sample per week. Baseline conditions are characterized by wind direction in the sector 190-280°, condensation nucleus concentration below 600 cm3, and steady, continuous CO2 concentrations (variation + 0.2 ppmv per hour). The Cape Grim in situ extraction line is based on 3 high-efficiency glass U-tube traps with internal cooling coils. A vacuum pump draws air from either the 10 m or 70 m intakes, and sampling

169

The Hydraulics of an Evolving Upwelling Jet Flowing around a Cape  

Science Conference Proceedings (OSTI)

Upwelling jets flow alongshore in approximate geostrophic balance with the onshore pressure gradient induced by coastal upwelling. Observations of such jets have shown that they often move offshore downstream of capes, leaving a pool of upwelled ...

Andrew C. Dale; John A. Barth

2001-01-01T23:59:59.000Z

170

Circulation and Transport in the Western Boundary Currents at Cape Farewell, Greenland  

Science Conference Proceedings (OSTI)

The circulation and volume transports in the western boundary currents around Cape Farewell, Greenland, are derived from full-depth hydrographic and velocity measurements from August–September 2005. The western boundary currents from surface to ...

N. P. Holliday; S. Bacon; J. Allen; E. L. McDonagh

2009-08-01T23:59:59.000Z

171

Observed Dynamics of Coastal Flow at Cape Mendocino during Coastal Waves 1996  

Science Conference Proceedings (OSTI)

Airborne in situ and remote meteorological measurements from around Cape Mendocino, California, sampled during the Coastal Waves 1996 field program are analyzed for three different days: 7, 12, and 26 June 1996. Two days conformed to typical ...

Linda Ström; Michael Tjernström; David P. Rogers

2001-05-01T23:59:59.000Z

172

Fuel Cell Demonstration at the U.S. Coast Guard Air Station Cape Cod  

Science Conference Proceedings (OSTI)

Journal article reporting on the 250-kW fuel cell combined heat and power plant located at the U.S. Coast Guard Air Station Cape Code in Bourne, Massachusetts.

Halverson, Mark A.; Chvala, William D.; Herrera, Shawn

2005-07-30T23:59:59.000Z

173

Eddy Shedding from a Boundary Current around a Cape over a Sloping Bottom  

Science Conference Proceedings (OSTI)

The authors discuss laboratory experiments that elucidate the mechanism of formation and westward drift of anticyclonic baroclinic vortices from a buoyant surface current flowing along a lateral boundary and around a cape. Experiments were ...

C. Cenedese; J. A. Whitehead

2000-07-01T23:59:59.000Z

174

Fog and Tidal Current Connection at Cape Cod Canal—Early Recognition and Recent Measurements  

Science Conference Proceedings (OSTI)

Notes by Gardner Emmons about the initiation of low advective fogs on Cape Cod are presented. Subsequent measurements made in these fogs confirm his suggestion that mixing and temperature changes associated with tidal currents account for the ...

Alfred H. Woodcock

1982-02-01T23:59:59.000Z

175

Mixing and Intrusions in a Rotating Cold-Core Feature off Cape Blanco, Oregon  

Science Conference Proceedings (OSTI)

During August 1986, a large cold anomaly was observed in satellite and in situ measurements near Cape Blanco at 42°N, 126°30?W off the Pacific Coast. Detailed vertical profiles of temperature, conductivity, turbulent dissipation, and horizontal ...

James N. Moum; Douglas R. Caldwell; Phyllis J. Stabeno

1988-06-01T23:59:59.000Z

176

Simulations of Supercritical Flow around Points and Capes in a Coastal Atmosphere  

Science Conference Proceedings (OSTI)

Fully 3D nonlinear model simulations for supercritical flow along locations at the California coast, at Cape Mendocino, and Point Sur, are presented. The model results are objectively and subjectively verified against measurements from the ...

Michael Tjernström; Branko Grisogono

2000-01-01T23:59:59.000Z

177

ARM - Evaluation Product - Convective Vertical Velocity  

NLE Websites -- All DOE Office Websites (Extended Search)

ProductsConvective Vertical Velocity ProductsConvective Vertical Velocity Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Evaluation Product : Convective Vertical Velocity 2011.04.25 - 2011.05.23 Site(s) SGP General Description Convective processes play an important role in Earth's energy balance by distributing heat and moisture throughout the atmosphere. 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 energy budget. However, direct measurements of vertical air motions (e.g., in situ aircraft observations) are sparse, making it difficult to compare them with numerical model output, which relies on convective parameterization schemes that have yet to be extensively

178

Sensitivity of Convective Cloud Growth to Mesoscale Lifting: A Numerical Analysis of Mesoscale Convective Triggering  

Science Conference Proceedings (OSTI)

Numerical model simulation of mesoscale lifting of the convective environment indicates that the ability of the environment to develop deep moist convection increases as mesoscale lifting increases. Mesoscale lifting produces increases in modeled ...

David A. Matthews; Bernard A. Silverman

1980-07-01T23:59:59.000Z

179

Convective Inhibition as a Predictor of Convection during AVE-SESAME II  

Science Conference Proceedings (OSTI)

The AVE-SESAME 11 data set of 19 April 1979 is examined to determine the thermodynamic conditions prior to the onset of deep convection in western Kansas. The observations indicate that the convective region was characterized locally by ...

Frank P. Colby Jr.

1984-11-01T23:59:59.000Z

180

Convective Evolution and Merger in the FACE Experimental Area: Mesoscale Convection and Boundary Layer Interactions  

Science Conference Proceedings (OSTI)

This paper investigates the interactions between the various scales of motion and, specifically, the inter-actions between convection and the surface boundary layer in the development of a mesoscale convective system within the Florida Area ...

John B. Cunning; Ronald L. Holle; Patrick T. Gannon; Andrew I. Watson

1982-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "variable convection cape" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Interactions between Shallow and Deep Convection under a Finite Departure from Convective Quasi Equilibrium  

Science Conference Proceedings (OSTI)

The present paper presents a simple theory for the transformation of nonprecipitating, shallow convection into precipitating, deep convective clouds. To make the pertinent point a much idealized system is considered, consisting only of shallow and ...

Jun-Ichi Yano; Robert Plant

2012-12-01T23:59:59.000Z

182

Mesoscale Convective Vortices Observed during BAMEX. Part II: Influences on Secondary Deep Convection  

Science Conference Proceedings (OSTI)

Observations from the Bow Echo and Mesoscale Convective Vortex (MCV) Experiment are used to examine the role of the five mesoscale convective vortices described in Part I on heavy precipitation during the daytime heating cycle. Persistent ...

Stanley B. Trier; Christopher A. Davis

2007-06-01T23:59:59.000Z

183

Sensitivity of Forecast Rainfall in a Texas Convective System to Soil Moisture and Convective Parameterization  

Science Conference Proceedings (OSTI)

The impact of soil moisture on the forecast of a small-scale convective system, and sensitivity of results to the convective parameterization used, are investigated through Eta Model simulations (run in an operational-like setting) of a ...

William A. Gallus Jr.; Moti Segal

2000-10-01T23:59:59.000Z

184

A Parameter Study of Interactions Between Convective Clouds, the Convective Boundary Layer, and a Forested Surface  

Science Conference Proceedings (OSTI)

A numerical model was developed which included cloud parameterizations, a convective boundary layer, solar and longwave radiation, a soil layer and a parameterized forest layer. The model simulated the growth of the convective boundary layer and ...

Alfred J. Garrett

1982-08-01T23:59:59.000Z

185

Multiscale Convective Overturning in Mesoscale Convective Systems: Reconciling Observations, Simulations, and Theory  

Science Conference Proceedings (OSTI)

An analysis of how parameterized convection interacts with hydrostatic, explicitly resolved precipitation processes to represent multiscale convective overturning in a mesoscale-resolution numerical simulation is presented. Critically important ...

John S. Kain; J. Michael Fritsch

1998-08-01T23:59:59.000Z

186

Tropical Pacific impacts of convective momentum ... - Springer  

Science Conference Proceedings (OSTI)

MJO and monsoons, either directly by changing the atmospheric response to convection, or indirectly by altering the background climatology and ENSO. In fact

187

Technical Sessions Parameterization of Convective Clouds, Mesoscale...  

NLE Websites -- All DOE Office Websites (Extended Search)

and Convective-Generated Clouds W. R. Cotton Department of Atmospheric Science Colorado State University Fort Collins, CO 80523 This presentation is a summary of research...

188

Geothermal: Sponsored by OSTI -- Improving Convection Parameterization...  

Office of Scientific and Technical Information (OSTI)

Improving Convection Parameterization Using ARM Observations and NCAR Community Atmosphere Model Geothermal Technologies Legacy Collection HelpFAQ | Site Map | Contact Us | Admin...

189

Parameterization of Convective Momentum Transport in Highly Baroclinic Conditions  

Science Conference Proceedings (OSTI)

The organization of convection by vertical shear strongly affects the transport of horizontal momentum, yet the concept of organization has received little attention in convective parameterization. Here the focus is on open-cellular convection in ...

Vanda Grubiši?; Mitchell W. Moncrieff

2000-09-01T23:59:59.000Z

190

Structure of the Atmosphere in Radiative–Convective Equilibrium  

Science Conference Proceedings (OSTI)

To investigate water vapor transport in an atmosphere in radiative–convective equilibrium, a simplified dynamical convection model (DCM) was constructed that explicitly models moist convection and longwave radiation in a gray atmosphere. In the ...

Yoshiharu Iwasa; Yutaka Abe; Hiroshi Tanaka

2002-07-01T23:59:59.000Z

191

Elevated Convection and Castellanus: Ambiguities, Significance, and Questions  

Science Conference Proceedings (OSTI)

The term elevated convection is used to describe convection where the constituent air parcels originate from a layer above the planetary boundary layer. Because elevated convection can produce severe hail, damaging surface wind, and excessive ...

Stephen F. Corfidi; Sarah J. Corfidi; David M. Schultz

2008-12-01T23:59:59.000Z

192

Deep Convection and “First Echoes” within Anvil Precipitation  

Science Conference Proceedings (OSTI)

The development of convective cells within anvil precipitation, in a region of moderate convective activity that might be called a small mesoscale convective system, is described and discussed. The presence of precipitation-sized hydrometeors in ...

Charles A. Knight; L. Jay Miller; William D. Hall

2004-07-01T23:59:59.000Z

193

Intraseasonal Convective Perturbations Related to the Seasonal March of the Indo-Pacific Monsoons  

Science Conference Proceedings (OSTI)

The seasonal evolution of the 20–90-day intraseasonal variability (ISV) of the convection in the Indo-Pacific region presents intriguing features related to monsoon dynamics: (i) a sharp ISV maximum in May for the southern Bay of Bengal and in ...

H. Bellenger; J. P. Duvel

2007-06-01T23:59:59.000Z

194

The Use of lce-Liquid Water Potential Temperature as a Thermodynamic Variable In Deep Atmospheric Models  

Science Conference Proceedings (OSTI)

Previous studies have shown liquid water potential temperature to be an inappropriate choice for a thermodynamic variable in a deep cumulus convection model. In this study, an alternate form of this variable called ice-liquid water potential ...

Gregory J. Tripoli; William R. Cotton

1981-05-01T23:59:59.000Z

195

Convection Initiation and Downburst Experiment (CINDE)  

Science Conference Proceedings (OSTI)

The Convection Initiation and Downburst Experiment (CINDE) was conducted in the Denver, Colorado area from 22 June to 7 August 1987 to study processes leading to the formation of deep convection and the physics of downbursts. A total of 6 Doppler ...

James W. Wilson; James A. Moore; G. Brant Foote; Brooks Martner; Taneil Uttal; James M. Wilczak; Alfred R. Rodi

1988-11-01T23:59:59.000Z

196

Nature versus Nurture in Shallow Convection  

Science Conference Proceedings (OSTI)

Tracers are used in a large-eddy simulation of shallow convection to show that stochastic entrainment (and not cloud-base properties) determines the fate of convecting parcels. The tracers are used to diagnose the correlations between a parcel’s ...

David M. Romps; Zhiming Kuang

2010-05-01T23:59:59.000Z

197

In situ Carbon 13 and Oxygen 18 Ratios of Atmospheric CO2 from Cape Grim,  

NLE Websites -- All DOE Office Websites (Extended Search)

Oxygen Isotopes and Ratios » 13C and 18O Oxygen Isotopes and Ratios » 13C and 18O Ratios, Atmospheric CO2, Cape Grim In situ Carbon 13 and Oxygen 18 Ratios of Atmospheric CO2 from Cape Grim, Tasmania, Australia: 1982-1993 DOI: 10.3334/CDIAC/atg.db1014 data Data Investigators Francey R. J. and C. E. Allison Description Since 1982, a continuous program of sampling atmospheric CO2 to determine stable isotope ratios has been maintained at the Australian Baseline Air Pollution Station, Cape Grim, Tasmania (40°, 40'56"S, 144°, 41'18"E). The process of in situ extraction of CO2 from air, the preponderance of samples collected in conditions of strong wind from the marine boundary layer of the Southern Ocean, and the determination of all isotope ratios relative to a common high purity CO2 reference gas with isotopic δ13C close to

198

Convective heat transfer inside passive solar buildings  

DOE Green Energy (OSTI)

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.

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

1983-01-01T23:59:59.000Z

199

A General Framework for Convective Trigger Functions  

Science Conference Proceedings (OSTI)

A general framework for the trigger function used in convective parameterization routines in mesoscale models is proposed. The framework is based on the diagnosis of the accessibility of potential buoyant energy. Specifically, the trigger ...

Robert F. Rogers; J. M. Fritsch

1996-11-01T23:59:59.000Z

200

Observations and Modeling of Banded Orographic Convection  

Science Conference Proceedings (OSTI)

Radar images and numerical simulations of three shallow convective precipitation events over the Coastal Range in western Oregon are presented. In one of these events, unusually well-defined quasi-stationary banded formations produced large ...

Daniel J. Kirshbaum; Dale R. Durran

2005-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "variable convection cape" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Convective Systems of the North Australian Monsoon  

Science Conference Proceedings (OSTI)

The climatology of convection over northern Australia and the surrounding oceans, based on six wet seasons (September–April), is derived from the Japanese Meteorological Agency Geostationary Meteorological Satellite-5 (GMS-5) IR1 channel for the ...

Mick Pope; Christian Jakob; Michael J. Reeder

2008-10-01T23:59:59.000Z

202

Doppler Radar Sampling Limitations in Convective Storms  

Science Conference Proceedings (OSTI)

Vertical air motion data from a T-28 aircraft were filtered and sampled to simulate Doppler radar measurements. The results suggest that multiple Doppler radar analyses are subject to potentially large spatial aliasing errors in deep convection ...

R. E. Carbone; M. J. Carpenter; C. D. Burghart

1985-09-01T23:59:59.000Z

203

Tracer dispersion in the turbulent convective layer  

Science Conference Proceedings (OSTI)

Experimental results for passive tracer dispersion in the turbulent surface layer under convective conditions are presented. In this case, the dispersion of tracer particles is determined by the interplay of two mechanisms: buoyancy and advection. ...

Alex Skvortsov; Milan Jamriska; Timothy C. DuBois

204

Convective Squalls over the Eastern Equatorial Atlantic  

Science Conference Proceedings (OSTI)

The Congo Basin and the adjacent equatorial eastern Atlantic are among the most active regions of the world in terms of intense deep moist convection, leading to frequent lightning and severe squalls. Studying the dynamics and climatology of this ...

Florian Berkes; Peter Knippertz; Douglas J. Parker; Gus Jeans; Valérie Quiniou-Ramus

2012-06-01T23:59:59.000Z

205

A Composite Model of Mesoscale Convective Complexes  

Science Conference Proceedings (OSTI)

A composite analysis technique is used to investigate the evolution of mesoscale features of mesoscale convective complexes (MCCs). The early stage of the MCC lifecycle is characterized by convergence, vertical motion and heating being centered ...

William R. Cotton; Ming-Sen Lin; Ray L. McAnelly; Craig J. Tremback

1989-04-01T23:59:59.000Z

206

Climatic Regimes of Tropical Convection and Rainfall  

Science Conference Proceedings (OSTI)

Annual distribution and phase propagation of tropical convection are delineated using harmonic and amplitude-phase characteristics analysis of climatological pentad mean outgoing longwave radiation and monthly frequencies of highly reflective ...

Bin Wang

1994-07-01T23:59:59.000Z

207

Radiation Impacts on Conditionally Unstable Moist Convection  

Science Conference Proceedings (OSTI)

The present work analyzes the impacts of radiative cooling in three-dimensional high-resolution direct numerical simulations of moist Rayleigh–Bénard convection. An atmospheric slab is destabilized by imposing a warm, moist lower boundary and a ...

Olivier Pauluis; Jörg Schumacher

2013-04-01T23:59:59.000Z

208

Measurement of Convective Entrainment Using Lagrangian Particles  

Science Conference Proceedings (OSTI)

Lagrangian particle tracking is used in a large-eddy simulation to study an individual cumulus congestus. This allows for the direct measurement of the convective entrainment rate and of the residence times of entrained parcels within the cloud. ...

Kyongmin Yeo; David M. Romps

2013-01-01T23:59:59.000Z

209

Resolving Convection in a Global Hypohydrostatic Model  

Science Conference Proceedings (OSTI)

Convection cannot be explicitly resolved in general circulation models given their typical grid size of 50 km or larger. However, by multiplying the vertical acceleration in the equation of motion by a constant larger than unity, the horizontal ...

S. T. Garner; D. M. W. Frierson; I. M. Held; O. Pauluis; G. K. Vallis

2007-06-01T23:59:59.000Z

210

Convective Control of ENSO Simulated in MIROC  

Science Conference Proceedings (OSTI)

The high sensitivity of the El Niño–Southern Oscillation (ENSO) to cumulus convection is examined by means of a series of climate simulations using an updated version of the Model for Interdisciplinary Research on Climate (MIROC), called MIROC5. ...

Masahiro Watanabe; Minoru Chikira; Yukiko Imada; Masahide Kimoto

2011-01-01T23:59:59.000Z

211

Estimation of Convective Rainfall from Lightning Observations  

Science Conference Proceedings (OSTI)

The objective of this study is to develop a technique to use lightning observations for estimating convective rainfall. A framework for rainfall estimation is developed in which key elements are 1) the rainfall–lightning ratio, that is, the ...

Alberto Tapia; James A. Smith; Michael Dixon

1998-11-01T23:59:59.000Z

212

Mesoscale Convective Complexes over Southern Africa  

Science Conference Proceedings (OSTI)

The maximum spatial correlation technique (MASCOTTE) is an objective and automated method developed to simultaneously determine both the structural properties and evolution (tracking) of cloud shields of convective systems. Originally designed to ...

R. C. Blamey; C. J. C. Reason

2012-01-01T23:59:59.000Z

213

Soil Moisture Impacts on Convective Margins  

Science Conference Proceedings (OSTI)

An idealized prototype for the location of the margins of tropical land region convection zones is extended to incorporate the effects of soil moisture and associated evaporation. The effect of evaporation, integrated over the inflow trajectory ...

Benjamin R. Lintner; J. David Neelin

2009-08-01T23:59:59.000Z

214

Moist Convection at a Surface Cold Front  

Science Conference Proceedings (OSTI)

The motion of a surface cold front in an environment that is unstable to moist convection is studied with the aid ofboth hydrostatic and nonhydrostatic two-dimensional models. Simulations with the hydrostatic model essentially extend the work ...

N. Andrew Crook

1987-12-01T23:59:59.000Z

215

Rotating Convection Driven by Differential Bottom Heating  

Science Conference Proceedings (OSTI)

Convection experiments were carried out in a rectangular tank as a model of oceanic meridional overturning circulation. The objective was finding a relation between the meridional heat flux and thermal forcing. To make the meridional heat flux ...

Young-Gyu Park; J. A. Whitehead

1999-06-01T23:59:59.000Z

216

Urban Aerosol Impacts on Downwind Convective Storms  

Science Conference Proceedings (OSTI)

The impacts of urban-enhanced aerosol concentrations on convective storm development and precipitation over and downwind of St. Louis, Missouri, are investigated. This is achieved through the use of a cloud-resolving mesoscale model, in which ...

Susan C. van den Heever; William R. Cotton

2007-06-01T23:59:59.000Z

217

Interannual variability of monsoon precipitation and local subcloud equivalent potential temperature  

Science Conference Proceedings (OSTI)

The interannual variability of monsoon precipitation is described in the context of a convective quasi-equilibrium framework. Using two reanalysis products and two global precipitation datasets, we examine linear relationships between seasonal ...

John V. Hurley; William R. Boos

218

Nested-Model Simulation of Moist Convection: The Impact of Coarse-Grid Parameterized Convection on Fine-Grid Resolved Convection  

Science Conference Proceedings (OSTI)

Future-generation, operational, weather prediction systems will likely include storm-scale, limited-area models that will explicitly resolve convective precipitation. However, the high-resolution convection-resolving grids will need to be ...

Thomas T. Warner; Hsiao-Ming Hsu

2000-07-01T23:59:59.000Z

219

Conservation justice in metropolitan Cape Town: A study at the Macassar Dunes Conservation Area  

E-Print Network (OSTI)

Conservation justice in metropolitan Cape Town: A study at the Macassar Dunes Conservation Area J xxxx Keywords: Conservation justice Community-based conservation South Africa Urban conservation Stakeholder analysis a b s t r a c t Conservation justice, a concept analogous to environmental justice

Silander Jr., John A.

220

The K1 Tide on the Continental Shelf from Nova Scotia to Cape Hatteras  

Science Conference Proceedings (OSTI)

A description is given of the K1 tide over the northeast continental shelf off North America from Nova Scotia to Cape Hatteras. Analyzed pressure data obtained from W. Brown and J. Irish (University of New Hampshire) have been used to draw up the ...

Peter R. Daifuku; Robert C. Beardsley

1983-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "variable convection cape" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Cape Blanco Wind Farm Feasibility Study : Technical Report, No. 2, Civil Engineering.  

Science Conference Proceedings (OSTI)

An investigation of the feasibility of developing a wind farm near Cape Blanco, Oregon, requires a plan for civil engineering and preliminary site construction activities. In this report, plans for such activities and related cost estimates are presented for a wind farm using either a Boeing MOD-2 or FloWind 170 wind turbine generator.

United States. Bonneville Power Administration.

1986-09-01T23:59:59.000Z

222

The Subtidal Response of Sea Level to Atmospheric Forcing in the Carolina Capes  

Science Conference Proceedings (OSTI)

The subtidal frequency response of sea level to atmospheric forcing along the coastal region between Cape Hatteras and Charleston is investigated for a four-month period: 1 September-31 December, 1974. It is found that low-frequency sea level ...

Shenn-Yu Chao; Leonard J. Pietrafesa

1980-08-01T23:59:59.000Z

223

The Deep Western Boundary Current at Cape Farewell: Results from a Moored Current Meter Array  

Science Conference Proceedings (OSTI)

An analysis is made of data from 30 Aanderaa recording current meters (RCMs) set on nine moorings located east of Cape Farewell, the southern tip of Greenland. The purpose of the measurements was to allow for the estimation of transport in the ...

Sheldon Bacon; Peter M. Saunders

2010-04-01T23:59:59.000Z

224

ARM - Midlatitude Continental Convective Clouds (jensen-sonde)  

DOE Data Explorer (OSTI)

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.

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

225

ARM - Midlatitude Continental Convective Clouds (jensen-sonde)  

SciTech Connect

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.

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

2012-01-19T23:59:59.000Z

226

Solar Irradiance Variability  

E-Print Network (OSTI)

The Sun has long been considered a constant star, to the extent that its total irradiance was termed the solar constant. It required radiometers in space to detect the small variations in solar irradiance on timescales of the solar rotation and the solar cycle. A part of the difficulty is that there are no other constant natural daytime sources to which the Sun's brightness can be compared. The discovery of solar irradiance variability rekindled a long-running discussion on how strongly the Sun affects our climate. A non-negligible influence is suggested by correlation studies between solar variability and climate indicators. The mechanism for solar irradiance variations that fits the observations best is that magnetic features at the solar surface, i.e. sunspots, faculae and the magnetic network, are responsible for almost all variations (although on short timescales convection and p-mode oscillations also contribute). In spite of significant progress important questions are still open. Thus there is a debat...

Solanki, Sami K

2012-01-01T23:59:59.000Z

227

Final Report on Evaluating the Representation and Impact of Convective Processes in the NCAR Community Climate System Model  

SciTech Connect

Convection and clouds affect atmospheric temperature, moisture and wind fields through the heat of condensation and evaporation and through redistributions of heat, moisture and momentum. Individual clouds have a spatial scale of less than 10 km, much smaller than the grid size of several hundred kilometers used in climate models. Therefore the effects of clouds must be approximated in terms of variables that the model can resolve. Deriving such formulations for convection and clouds has been a major challenge for the climate modeling community due to the lack of observations of cloud and microphysical properties. The objective of our DOE CCPP project is to evaluate and improve the representation of convection schemes developed by PIs in the NCAR (National Center for Atmospheric Research) Community Climate System Model (CCSM) and study its impact on global climate simulations. • The project resulted in nine peer-reviewed publications and numerous scientific presentations that directly address the CCPP’s scientific objective of improving climate models. • We developed a package of improved convection parameterization that includes improved closure, trigger condition for convection, and comprehensive treatment of convective momentum transport. • We implemented the new convection parameterization package into several versions of the NCAR models (both coupled and uncoupled). This has led to 1) Improved simulation of seasonal migration of ITCZ; 2) Improved shortwave cloud radiative forcing response to El Niño in CAM3; 3) Improved MJO simulation in both uncoupled and coupled model; and 4) Improved simulation of ENSO in coupled model. • Using the dynamic core of CCM3, we isolated the dynamic effects of convective momentum transport. • We implemented mosaic treatment of subgrid-scale cloud-radiation interaction in CCM3.

X. Wu, G. J. Zhang

2008-04-23T23:59:59.000Z

228

Hierarchy of Conservation Laws of Diffusion–Convection Equations  

E-Print Network (OSTI)

We introduce notions of equivalence of conservation laws with respect to Lie symmetry groups for fixed systems of differential equations and with respect to equivalence groups or sets of admissible transformations for classes of such systems. We also revise the notion of linear dependence of conservation laws and define the notion of local dependence of potentials. To construct conservation laws, we develop and apply the most direct method which is effective to use in the case of two independent variables. Admitting possibility of dependence of conserved vectors on a number of potentials, we generalize the iteration procedure proposed by Bluman and Doran-Wu for finding nonlocal (potential) conservation laws. As an example, we completely classify potential conservation laws (including arbitrary order local ones) of diffusion–convection equations with respect to the equivalence group and construct an exhaustive list of locally inequivalent potential systems corresponding to these equations. 1

Roman O. Popovych; Nataliya M. Ivanova

2005-01-01T23:59:59.000Z

229

Modeling Study of a Tropical Squall-Type Convective Line  

Science Conference Proceedings (OSTI)

A multidimensional and time-dependent cloud scale model is used to investigate the dynamic and micro-physical processes associated with convective and stratiform regions within a tropical squall-type convective line. The evolution of the total ...

Wei-Kuo Tao; Joanne Simpson

1989-01-01T23:59:59.000Z

230

Synoptic Environments Associated with the Training of Convective Cells  

Science Conference Proceedings (OSTI)

Many studies have been done on synoptically forced systems and heavy rainfall, but little research has gone into the forecasting of training convective storms specifically in a synoptically forced environment. Training convective storms are ...

Ryan P. Aylward; Jamie L. Dyer

2010-04-01T23:59:59.000Z

231

Mesoscale Convective Complexes over the United States during 1982  

Science Conference Proceedings (OSTI)

An important class of convective weather system, the mesoscale convective complex (MCC), presents many challenges and problems to both the research and operational communities. In addition, thew very large and long-lived thunderstorm systems have ...

D. M. Rodgers; K. W. Howard; E. C. Johnston

1983-12-01T23:59:59.000Z

232

Simulation of Tropical Convective Systems. Part I: A Cumulus Parameterization  

Science Conference Proceedings (OSTI)

A new cumulus parametefization is developed for ffse in mesoscale model simulations of precipitating convective systems. It is designed to estimate convective properties using a cloud model that interacts with the mesoscale model in a physically ...

William M. Frank; Charles Cohen

1987-12-01T23:59:59.000Z

233

Hydrography of the Labrador Sea during Active Convection  

Science Conference Proceedings (OSTI)

The hydrographic structure of the Labrador Sea during wintertime convection is described. The cruise, part of the Deep Convection Experiment, took place in February–March 1997 amidst an extended period of strong forcing in an otherwise moderate ...

Robert S. Pickart; Daniel J. Torres; R. Allyn Clarke

2002-02-01T23:59:59.000Z

234

Convective Momentum Transport over the Tropical Pacific: Budget Estimates  

Science Conference Proceedings (OSTI)

ECMWF and NCEP–NCAR reanalyses are used to calculate convective momentum transport (CMT) as a momentum budget residual over several tropical oceanic convective regions, including the TOGA COARE Intensive Flux Array (IFA). Sources of uncertainty ...

Matthew T. Carr; Christopher S. Bretherton

2001-07-01T23:59:59.000Z

235

Thermodynamic and Circulation Characteristics, of Winter Monsoon Tropical Mesoscale Convection  

Science Conference Proceedings (OSTI)

During the December 1978 field phase of the International Winter Monsoon Experiment (Winter MONEX), a regular diurnal cycle of deep convective activity occurred over the South China Sea immediately to the north of Borneo. The convection was ...

Richad H. Johnson; Donald C. Kriete

1982-12-01T23:59:59.000Z

236

Mesoscale Convective Complexes over the United States during 1983  

Science Conference Proceedings (OSTI)

Enhanced infrared satellite imagery is used to document the occurrence of mesoscale convective complexes over the United States during 1983. Thirty large convective systems are identified that display satellite-observable characteristics which ...

D. M. Rodgers; M. J. Magnano; J. H. Arns

1985-05-01T23:59:59.000Z

237

Multiscale Convective Organization and the YOTC Virtual Global Field Campaign  

Science Conference Proceedings (OSTI)

The Year of Tropical Convection (YOTC) project recognizes that major improvements are needed in how the tropics are represented in climate models. Tropical convection is organized into multiscale precipitation systems with an underlying chaotic order. ...

Mitchell W. Moncrieff; Duane E. Waliser; Martin J. Miller; Melvyn A. Shapiro; Ghassem R. Asrar; James Caughey

2012-08-01T23:59:59.000Z

238

Convection in TOGA COARE: Horizontal Scale, Morphology, and Rainfall Production  

Science Conference Proceedings (OSTI)

The occurrence frequency and rainfall production of mesoscale convective systems (MCSs) relative to smaller groups of convective clouds over the tropical oceans is not well known. Eighty days of shipboard radar data collected during the recent ...

Thomas M. Rickenbach; Steven A. Rutledge

1998-09-01T23:59:59.000Z

239

Effects of Convection Cell Geometry on Simulated Tornadoes  

Science Conference Proceedings (OSTI)

Experimental data and theory suggest that certain convection cell scale factors must be specified for correct interpretation of tornado simulations. The most important nondimensional number appears to be the ratio of convection cell depth (...

Eugene M. Wilkins; Chris J. Diamond

1987-01-01T23:59:59.000Z

240

Structures and Dynamics of Quasi-2D Mesoscale Convective Systems  

Science Conference Proceedings (OSTI)

Recently, three distinct archetypes for midlatitude linear mesoscale convective systems (MCSs) have been identified. This article focuses on the fundamentals of two of these archetypes: convective lines with trailing stratiform (TS) precipitation ...

Matthew D. Parker; Richard H. Johnson

2004-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "variable convection cape" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Baroclinic Transition of a Long-Lived Mesoscale Convective Vortex  

Science Conference Proceedings (OSTI)

The period 5–15 June 2003, during the field phase of the Bow Echo and Mesoscale Convective Vortex (MCV) Experiment (BAMEX), was noteworthy for the wide variety of mesoscale convective systems (MCSs) that occurred. Of particular interest was a ...

Thomas J. Galarneau Jr.; Lance F. Bosart; Christopher A. Davis; Ron McTaggart-Cowan

2009-02-01T23:59:59.000Z

242

A Theory for Long-Lived Mesoscale Convective Systems  

Science Conference Proceedings (OSTI)

It is proposed that certain long-lived mesoscale convective systems maintain themselves through an interaction between quasi-balanced vertical motions and the diabatic effects of moist convection. Latent heat release, evaporation and melting of ...

D. J. Raymond; H. Jiang

1990-12-01T23:59:59.000Z

243

Linear Stratospheric Gravity Waves above Convective Thermal Forcing  

Science Conference Proceedings (OSTI)

The spectra of linear gravity waves generated by a time-varying tropospheric thermal forcing representing organized convection are compared to the spectra of stratospheric gravity waves generated by organized convection in a fully nonlinear two-...

Rajul E. Pandya; M. Joan Alexander

1999-07-01T23:59:59.000Z

244

Convective Contribution to the Genesis of Hurricane Ophelia (2005)  

Science Conference Proceedings (OSTI)

The convection occurring in the tropical depression that became Hurricane Ophelia (2005) was investigated just prior to tropical storm formation. Doppler radar showed a deep, wide, intense convective cell of a type that has been previously ...

Robert A. Houze Jr.; Wen-Chau Lee; Michael M. Bell

2009-09-01T23:59:59.000Z

245

Balanced Dynamics of Mesoscale Vortices Produced in Simulated Convective Systems  

Science Conference Proceedings (OSTI)

Long-lived, mesoscale convective systems are known to occasionally produce mesoscale convective vortices (MCVs) in the lower to middle troposphere with horizontal scales averaging 100–200 km. The formation of MCVs is investigated using fully ...

Christopher A. Davis; Morris L. Weisman

1994-07-01T23:59:59.000Z

246

Regulation of Moist Convection over the West Pacific Warm Pool  

Science Conference Proceedings (OSTI)

The mechanisms that regulate moist convection over the warm tropical oceans are not well understood. One school of thought holds that convection is caused by the convergence of moisture, which in turn is produced by an independent dynamical ...

David J. Raymond

1995-11-01T23:59:59.000Z

247

Resonant Response of Deep Convection to Surface Hot Spots  

Science Conference Proceedings (OSTI)

Observations show substantial variations of the intensity of tropical and/or summertime deep convection on land that are not explained by standard measures of convective instability. One feature that distinguishes land surfaces is their ...

F. J. Robinson; S. C. Sherwood; Y. Li

2008-01-01T23:59:59.000Z

248

Behavior of Turbulence Statistics in the Convective Boundary Layer  

Science Conference Proceedings (OSTI)

Velocity variances in the convective boundary layer are examined using data derived in PBL experiments over land (Minnesota) and ocean (the Coral Sea) supported by data from the Kansas study of the surface boundary layer. In the freely convective ...

B. B. Hicks

1985-06-01T23:59:59.000Z

249

Scalable adaptive mantle convection simulation on petascale supercomputers  

Science Conference Proceedings (OSTI)

Mantle convection is the principal control on the thermal and geological evolution of the Earth. Mantle convection modeling involves solution of the mass, momentum, and energy equations for a viscous, creeping, incompressible non-Newtonian fluid at high ...

Carsten Burstedde; Omar Ghattas; Michael Gurnis; Georg Stadler; Eh Tan; Tiankai Tu; Lucas C. Wilcox; Shijie Zhong

2008-11-01T23:59:59.000Z

250

Convectively Driven Turbulent Mixing in the Upper Ocean  

Science Conference Proceedings (OSTI)

Two experiments were performed to study the characteristics of turbulence in convective mixed layers in the upper Ocean. In the first, a diurnal convective mixed layer developed in the Bahamas under the influence of the cycle of daytime solar ...

T. J. Shay; M. C. Gregg

1986-11-01T23:59:59.000Z

251

Implicit Versus Explicit Convective Heating in Numerical Weather Prediction Models  

Science Conference Proceedings (OSTI)

The ability of several explicit formulations of convective heating to predict the precipitation associated with a mesoscale convective complex was compared to that of a cumulus parameterization on a ½ deg latitude-longitude mesh. In the explicit ...

John Molinari; Michael Dudek

1986-10-01T23:59:59.000Z

252

A Model to Determine Open or Closed Cellular Convection  

Science Conference Proceedings (OSTI)

A simple mechanism is proposed to help explain the observed presence in the atmosphere of open or closed cellular convection. If convection is produced by cooling concentrated near the top of the cloud layer, as in radiative cooling of stratus ...

H. Mark Helfand; Eugenia Kalnay

1983-03-01T23:59:59.000Z

253

Cloud-to-Ground Lightning Activity in Mesoscale Convective Complexes  

Science Conference Proceedings (OSTI)

A study of cloud-to-ground lightning activity attending an important subclass of mesoscale convective weather systems called the mesoscale convective complex shows that groun discharge flash rates in excess of 1000 h?1 can be sustained on average ...

S. J. Goodman; D. R. MacGorman

1986-12-01T23:59:59.000Z

254

Parameterized Updraft Mass Flux as a Predictor of Convective Intensity  

Science Conference Proceedings (OSTI)

Parameterized updraft mass flux, available as a unique predictive field from the Kain–Fritsch (KF) convective parameterization, is presented as a potentially valuable predictor of convective intensity. The KF scheme is described in some detail, ...

John S. Kain; Michael E. Baldwin; Steven J. Weiss

2003-02-01T23:59:59.000Z

255

Cycles and Propagation of Deep Convection over Equatorial Africa  

Science Conference Proceedings (OSTI)

Long-term statistics of organized convection are vital to improved understanding of the hydrologic cycle at various scales. Satellite observations are used to understand the timing, duration, and frequency of deep convection in equatorial Africa, ...

Arlene G. Laing; Richard E. Carbone; Vincenzo Levizzani

2011-09-01T23:59:59.000Z

256

Aircraft Investigation of Mesoscale Cellular Convection During AMTEX 75  

Science Conference Proceedings (OSTI)

The 1 s data set collected by the NCAR Electra research aircraft in the presence of closed mesoscale cellular convection (MCC) has been examined for the purpose of determining the convective wind field and horizontal profiles of temperature and ...

Jeffry Rothermel; Ernest M. Agee

1980-05-01T23:59:59.000Z

257

Factors Governing the Total Rainfall Yield from Continental Convective Clouds  

Science Conference Proceedings (OSTI)

Several important factors that govern the total rainfall from continental convective clouds were investigated by tracking thousands of convective cells in Israel and South Africa. The rainfall volume yield (Rvol) of the individual cells that ...

Daniel Rosenfeld; Abraham Gagin

1989-10-01T23:59:59.000Z

258

Nonlinear Effects on Convectively Forced Two-Dimensional Mesoscale Flows  

Science Conference Proceedings (OSTI)

One of the important problems in mesoscale atmospheric dynamics is how the atmosphere responds to convective heating or cooling. Here, the authors examine nonlinear effects on convectively forced mesoscale flows in the context of the nonlinear ...

Ji-Young Han; Jong-Jin Baik

2012-11-01T23:59:59.000Z

259

Physics of Greenhouse Effect and Convection in Warm Oceans  

Science Conference Proceedings (OSTI)

Sea surface temperature (SST) in roughly 50% of the tropical Pacific Ocean is warm enough (SST > 300 K) to permit deep convection. This paper examines the effects of deep convection on the climatological mean vertical distributions of water vapor ...

A. K. Inamdar; V. Ramanathan

1994-05-01T23:59:59.000Z

260

A Convective Line with Leading Stratiform Precipitation from BAMEX  

Science Conference Proceedings (OSTI)

On 31 May 2003, a front-fed convective line with leading stratiform precipitation (FFLS) was observed during the Bow Echo and Mesoscale Convective Vortex Experiment (BAMEX). The high-resolution BAMEX measurements provided one of the first ...

Brandon A. Storm; Matthew D. Parker; David P. Jorgensen

2007-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "variable convection cape" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Coastal Atmospheric Circulation around an Idealized Cape during Wind-Driven Upwelling Studied from a Coupled Ocean–Atmosphere Model  

Science Conference Proceedings (OSTI)

The study analyzes atmospheric circulation around an idealized coastal cape during summertime upwelling-favorable wind conditions simulated by a mesoscale coupled ocean–atmosphere model. The domain resembles an eastern ocean boundary with a ...

Natalie Perlin; Eric D. Skyllingstad; Roger M. Samelson

2011-03-01T23:59:59.000Z

262

Sea-Breeze Circulations over Cape York Peninsula and the Generation of Gulf of Carpentaria Cloud Line Disturbances  

Science Conference Proceedings (OSTI)

A numerical study of sea-breeze circulations over Cape York Peninsula in northern Australia is presented. Simulations using a two-dimensional version of the University of Virginia mesoscale model provide insight into the thermally induced ...

Julie A. Noonan; Roger K. Smith

1986-08-01T23:59:59.000Z

263

Comparison between Low-Flash and Non-Lightning-Producing Convective Areas within a Mature Mesoscale Convective System  

Science Conference Proceedings (OSTI)

Two small multicellular convective areas within a larger mesoscale convective system that occurred on 20 June 2004 were examined to assess vertical motion, radar reflectivity, and dual-polarimetric signatures between flash and non-flash-producing ...

Jennifer L. Palucki; Michael I. Biggerstaff; Donald R. MacGorman; Terry Schuur

2011-08-01T23:59:59.000Z

264

The Convective Instability Pathway to Warm Season Drought in Texas. Part II: Free-Tropospheric Modulation of Convective Inhibition  

Science Conference Proceedings (OSTI)

This study is concerned with the modulation by convective instability of summertime precipitation in Texas as a mechanism for maintaining or enhancing drought. The important role of convective inhibition (CIN), its dependence on the temperature ...

Boksoon Myoung; John W. Nielsen-Gammon

2010-09-01T23:59:59.000Z

265

Heat Flux Partitioning in Open-Ocean Convection  

Science Conference Proceedings (OSTI)

Cold air blowing out over a warm ocean leads to convection over an isolated region of the ocean basin. This phenomenon, known as open-ocean convection, is often simulated by convective forcing from a circular disk much smaller than the dimension ...

David Brickman

1995-11-01T23:59:59.000Z

266

Simulations of stellar convection with CO5BOLD  

Science Conference Proceedings (OSTI)

High-resolution images of the solar surface show a granulation pattern of hot rising and cooler downward-sinking material - the top of the deep-reaching solar convection zone. Convection plays a role for the thermal structure of the solar interior and ... Keywords: Numerical simulations, Radiation (magneto)hydrodynamics, Stellar surface convection

B. Freytag; M. Steffen; H. -G. Ludwig; S. Wedemeyer-Böhm; W. Schaffenberger; O. Steiner

2012-02-01T23:59:59.000Z

267

Coupling of Convective Momentum Transport with Convective Heating in Global Climate Simulations  

Science Conference Proceedings (OSTI)

The effects of convective momentum transport (CMT) on global climate simulations are examined in this study. Comparison between two sets of 20-yr (1979–98) integration using the NCAR Community Climate Model version 3 (CCM3) illustrates that the ...

Xiaoqing Wu; Liping Deng; Xiaoliang Song; Guang Jun Zhang

2007-04-01T23:59:59.000Z

268

Response of Tropical Deep Convection to Localized Heating Perturbations: Implications for Aerosol-Induced Convective Invigoration  

Science Conference Proceedings (OSTI)

A cloud-system-resolving model is used to investigate the effects of localized heating/cooling perturbations on tropical deep convection, in the context of the aerosol “invigoration effect.” This effect supposes that a reduction of droplet ...

Hugh Morrison; Wojciech W. Grabowski

2013-11-01T23:59:59.000Z

269

Unsteady, Turbulent Convection into a Rotating, Linearly Stratified Fluid: Modeling Deep Ocean Convection  

Science Conference Proceedings (OSTI)

A laboratory experiment has been constructed to Model the deep convective processes in a stratified ocean driven by the energetic cooling at the ocean surface. For convenience in the laboratory the authors have examined the analogous but inverted ...

M. J. Coates; G. N. Ivey; J. R. Taylor

1995-12-01T23:59:59.000Z

270

Numerical Prediction of Convectively Driven Mesoscale Pressure Systems. Part I: Convective Parameterization  

Science Conference Proceedings (OSTI)

A parameterization formulation for incorporating the effects of midlatitude deep convection into mesoscale-numerical models is presented. The formulation is based on the hypothesis that the buoyant energy available to a parcel, in combination ...

J. M. Fritsch; C. F. Chappell

1980-08-01T23:59:59.000Z

271

Precipitation and Kinematic Structure of an Oceanic Mesoscale Convective System. Part I: Convective Line Structure  

Science Conference Proceedings (OSTI)

The precipitation, thermodynamic, and kinematic structure of an oceanic mesoscale convective system is studied using airborne Doppler and in situ (flight-level) data collected by the NOAA P-3 aircraft. The system, a well-organized, stationary, ...

David P. Jorgensen; Margaret A. LeMone; Ben Jong-Dao Jou

1991-11-01T23:59:59.000Z

272

Aerosol Indirect Effects on Tropical Convection Characteristics under Conditions of Radiative–Convective Equilibrium  

Science Conference Proceedings (OSTI)

The impacts of enhanced aerosol concentrations such as those associated with dust intrusions on the trimodal distribution of tropical convection have been investigated through the use of large-domain (10 000 grid points), fine-resolution (1 km), ...

Susan C. van den Heever; Graeme L. Stephens; Norman B. Wood

2011-04-01T23:59:59.000Z

273

The Effects of Midlatitude Waves over and around the Tibetan Plateau on Submonthly Variability of the East Asian Summer Monsoon  

Science Conference Proceedings (OSTI)

Convective variability at submonthly time scales (7–25 days) over the Yangtze and Huaihe River basins (YHRBs) and associated large-scale atmospheric circulation during the mei-yu season were examined using interpolated outgoing longwave radiation ...

Hatsuki Fujinami; Tetsuzo Yasunari

2009-07-01T23:59:59.000Z

274

Regional Heat Sources and the Active and Break Phases of Boreal Summer Intraseasonal (30–50 Day) Variability  

Science Conference Proceedings (OSTI)

The boreal summer intraseasonal variability (BSISV) associated with the 30–50-day mode is represented by the coexistence of three components: poleward propagation of convection over the Indian and tropical west Pacific longitudes and eastward ...

H. Annamalai; K. R. Sperber

2005-08-01T23:59:59.000Z

275

MHK Projects/Wavemill Energy Cape Breton Island NS CA | Open Energy  

Open Energy Info (EERE)

Energy Cape Breton Island NS CA Energy Cape Breton Island NS CA < MHK Projects Jump to: navigation, search << Return to the MHK database homepage Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":5,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"500px","height":"350px","centre":false,"title":"","label":"","icon":"File:Aquamarine-marker.png","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":46.2487,"lon":-60.8518,"alt":0,"address":"","icon":"http:\/\/prod-http-80-800498448.us-east-1.elb.amazonaws.com\/w\/images\/7\/74\/Aquamarine-marker.png","group":"","inlineLabel":"","visitedicon":""}]}

276

MHK Projects/GCK Technology Cape Cod Canal MA US | Open Energy Information  

Open Energy Info (EERE)

GCK Technology Cape Cod Canal MA US GCK Technology Cape Cod Canal MA US < MHK Projects Jump to: navigation, search << Return to the MHK database homepage Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":5,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"500px","height":"350px","centre":false,"title":"","label":"","icon":"File:Aquamarine-marker.png","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.7433,"lon":-70.6093,"alt":0,"address":"","icon":"http:\/\/prod-http-80-800498448.us-east-1.elb.amazonaws.com\/w\/images\/7\/74\/Aquamarine-marker.png","group":"","inlineLabel":"","visitedicon":""}]}

277

MHK Projects/Cape Cod Tidal Energy Project | Open Energy Information  

Open Energy Info (EERE)

Cape Cod Tidal Energy Project Cape Cod Tidal Energy Project < MHK Projects Jump to: navigation, search << Return to the MHK database homepage Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":5,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"500px","height":"350px","centre":false,"title":"","label":"","icon":"File:Aquamarine-marker.png","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.7686,"lon":-70.5651,"alt":0,"address":"","icon":"http:\/\/prod-http-80-800498448.us-east-1.elb.amazonaws.com\/w\/images\/7\/74\/Aquamarine-marker.png","group":"","inlineLabel":"","visitedicon":""}]}

278

CAPE-OPEN compliant stochastic modeling and reduced-order model computation capability for APECS system  

Science Conference Proceedings (OSTI)

APECS (Advanced Process Engineering Co-Simulator) is an integrated software suite that combines the power of process simulation with high-fidelity, computational fluid dynamics (CFD) for improved design, analysis, and optimization of process engineering systems. The APECS system uses commercial process simulation (e.g., Aspen Plus) and CFD (e.g., FLUENT) software integrated with the process-industry standard CAPE-OPEN (CO) interfaces. This breakthrough capability allows engineers to better understand and optimize the fluid mechanics that drive overall power plant performance and efficiency. The focus of this paper is the CAPE-OPEN complaint stochastic modeling and reduced order model computational capability around the APECS system. The usefulness of capabilities is illustrated with coal fired, gasification based, FutureGen power plant simulation. These capabilities are used to generate efficient reduced order models and optimizing model complexities.

Diwekar, Urmila (Vishwamitra Research Institute, Clarendon Hills, IL); Shastri, Yogendra (Vishwamitra Research Institute Clarendon Hills, IL); Subrmanyan, Karthik (Vishwamitra Research Institute, Clarendon Hills, IL); Zitney, S.E.

2007-11-04T23:59:59.000Z

279

Convective Building of a Pycnocline: Laboratory Experiments  

Science Conference Proceedings (OSTI)

The convective building of a pycnocline is examined using a laboratory model forced by surface fluxes of saline water at one end and fresh water at the other. A deep recirculation evolves in the tank, which homogenizes the interior fluid by ...

David W. Pierce; Peter B. Rhines

1996-02-01T23:59:59.000Z

280

A Convective Cell in a Hurricane Rainband  

Science Conference Proceedings (OSTI)

On 10 October 1983 the two NOAA WP-3D aircraft completed a mission designed to provide airborne Doppler radar data for a convective cell embedded in a weak rainband on the trailing side of Hurricane Raymond. Comparisons of the wind field produced ...

G. M. Barnes; J. F. Gamache; M. A. LeMone; G. J. Stossmeister

1991-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "variable convection cape" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Transport Asymmetry in Skewed Convective Circulations  

Science Conference Proceedings (OSTI)

Two simple kinematical models are used to describe the asymmetry in bottom-up and top-down diffusion in the convective boundary layer. Both models resolve the mean circulation with narrow updrafts and wider downdrafts but differ in the treatment ...

Ulrich Schumann

1993-01-01T23:59:59.000Z

282

`Convective` flat plate collectors and their applications  

SciTech Connect

The `convective` flat plate collector is a particular two-way collector system with air in gravity flow as primary working fluid. Its thermal characteristics are described. Results of outdoor tests and thermal simulations are shown. Different applications of the system are presented: water heating, steam generation for medical sterilization, solar cooking and space heating. 10 refs., 16 figs., 6 tabs.

Grupp, M.; Bergler, H.; Bertrand, J.P. [Synopsis, Lodeve (France); Kromer, B. [Institut fuer Umweltphysik der Universtaet, Heidelberg (Germany); Cieslok, J. [INCO, Aachen (Germany)

1995-12-31T23:59:59.000Z

283

A Convective Transport Theory for Surface Fluxes  

Science Conference Proceedings (OSTI)

For a boundary layer in free convection where turbulent thermal structures communicate information between the surface and the interior of the mixed layer, it is hypothesized that the surface momentum flux can be parameterized by u*2 = bDwBMML, ...

Roland B. Stull

1994-01-01T23:59:59.000Z

284

A Simple Method for Measuring Deep Convection  

Science Conference Proceedings (OSTI)

The glass-pipe technology used for RAFOS floats is applied to the monitoring of convection in deep mixed layers. The velocity of a vertical current is estimated from the relationship between the drag force exerted on a float by the vertical ...

Edward J. Kearns; H. Thomas Rossby

1993-08-01T23:59:59.000Z

285

B I OENV I RONMENTAL FEATURES OF THE OGOTORUK CREEK AREA, CAPE THOMPSON, ALASKA  

Office of Legacy Management (LM)

B I OENV I RONMENTAL FEATURES B I OENV I RONMENTAL FEATURES OF THE OGOTORUK CREEK AREA, CAPE THOMPSON, ALASKA A First Summary by The Committee on Environmental Studies for Project Chariot . . December 1960 r Division of Biology and Medicine, AEC Washington, D. C. IT U S WEGWS LIBIA3"b This page intentionally left blank NUCLEAR EXPLOSIONS -PEACE UL APPLICATIONS . . BIOLOGY AND MEDICINE BIOENVIRONMENTAL FEATURES OF THE OGOTORUK CREEK AREA . . CAPE THOMPSON, ALASKA A F i r s t Sumnary The C o d t t e e on E n v i r o n m e n t a l S t u d i e s for P r o j e c t C h a r i o t PLllWSHARE PROGRAM THE UNITED STATES ATOMIC ENERGY COMMISSION December, 1 9 6 0 MAP OF ALASKA - CHARIOT LOCATION SCALE IN MILES . 111*1.1) , FOREWORD . . This summary is based on the reports on more than 30 bioenvironmental investigations carried out' in the Cape Thompson area in Alaska since

286

Variable Screw Compressor, Variable Screw Compressor Suppliers ...  

U.S. Energy Information Administration (EIA)

Variable Screw Compressor Suppliers & air compressor Manufacturers Directory. Source Top Quality Variable Screw Compressor Suppliers, air ...

287

Nowcasting Thunderstorm Anvil Clouds over Kennedy Space Center and Cape Canaveral Air Force Station  

Science Conference Proceedings (OSTI)

Electrified thunderstorm anvil clouds extend the threat of natural and triggered lightning to space launch and landing operations far beyond the immediate vicinity of thunderstorm cells. The deep convective updrafts of thunderstorms transport ...

David A. Short; James E. Sardonia; Winifred C. Lambert; Mark M. Wheeler

2004-08-01T23:59:59.000Z

288

Asian Summer Monsoon Intraseasonal Variability in General Circulation Models  

SciTech Connect

The goals of this report are: (1) Analyze boreal summer Asian monsoon intraseasonal variability general circulation models--How well do the models represent the eastward and northward propagating components of the convection and how well do the models represent the interactive control that the western tropical Pacific rainfall exerts on the rainfall over India and vice-versa? (2) Role of air-sea interactions--prescribed vs. interactive ocean; and (3) Mean monsoon vs. variability.

Sperber, K R; Annamalai, H

2004-02-24T23:59:59.000Z

289

Mixed finite-difference/integral transform approach for parabolic-hyperbolic problems in transient forced convection  

SciTech Connect

The integral transform method is employed in conjunction with second-order-accurate explicit finite-differences schemes, to handle accurately a class of parabolic-hyperbolic problems that appear in connection with transient forced convection inside ducts. The integral transformation process eliminates the independent variables in which the diffusion phenomena predominate. A system of coupled hyperbolic equations then results, involving time and the space coordinates in which convection is dominant, which is solved numerically through a modified upwind second-order finite-difference scheme. Stability and convergence characteristics of the proposed mixed approach are also examined. Typical applications in two- and three-dimensional geometries are considered, for both slug and laminar flow situations.

Cotta, R.M.; Gerk, J.E.V. (Univ. Federal do Rio de Janeiro (Brazil). Dept. de Engenharia Mecanica)

1994-06-01T23:59:59.000Z

290

Convective transport in laser target plasmas  

SciTech Connect

The role of guiding-center corrections in convective transport of electron energy is examined with a simple numerical model. At 10/sup 16/W cm/sup -2/ with a 60-..mu..m spot and a 10.6-..mu..m wavelength laser, the Righi-Leduc term is observed to have little effect on transport in a calculation with the thermal flux limited to the free-streaming value.

Brackbill, J.U.; Colombant, D.; Grandjouan, N.

1982-01-01T23:59:59.000Z

291

Convective heat transport in geothermal systems  

DOE Green Energy (OSTI)

Most geothermal systems under exploitation for direct use or electrical power production are of the hydrothermal type, where heat is transferred essentially by convection in the reservoir, conduction being secondary. In geothermal systems, buoyancy effects are generally important, but often the fluid and heat flow patterns are largely controlled by geologic features (e.g., faults, fractures, continuity of layers) and location of recharge and discharge zones. During exploitation, these flow patterns can drastically change in response to pressure and temperature declines, and changes in recharge/discharge patterns. Convective circulation models of several geothermal systems, before and after start of fluid production, are described, with emphasis on different characteristics of the systems and the effects of exploitation on their evolution. Convective heat transport in geothermal fields is discussed, taking into consideration (1) major geologic features; (2) temperature-dependent rock and fluid properties; (3) fracture- versus porous-medium characteristics; (4) single- versus two-phase reservoir systems; and (5) the presence of noncondensible gases.

Lippmann, M.J.; Bodvarsson, G.S.

1986-08-01T23:59:59.000Z

292

ARM - Field Campaign - Midlatitude Continental Convective Clouds Experiment  

NLE Websites -- All DOE Office Websites (Extended Search)

Experiment (MC3E) Experiment (MC3E) Campaign Links Science Plan MC3E Website Related Campaigns Midlatitude Continental Convective Clouds Experiment: 2DVD Support 2011.04.22, Schwaller, SGP Midlatitude Continental Convective Clouds Experiment (MC3E): Airborne Instruments 2011.04.22, Poellot, AAF Midlatitude Continental Convective Clouds Experiment (MC3E): Multi-Frequency Profilers 2011.04.22, Williams, SGP Midlatitude Continental Convective Clouds Experiment: Parsivel Disdrometer Support 2011.04.22, Schwaller, SGP Midlatitude Continental Convective Clouds Experiment (MC3E): Inner Domain Thermodynamic Profiling during MC3E 2011.04.22, Turner, 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)

293

PROPAGATION OF GRAVITY WAVES IN A CONVECTIVE LAYER  

SciTech Connect

We perform numerical simulations of gravity mode propagation in a convective layer to investigate the observed association between small spatial scales and low frequencies in the photospheric velocity fields. According to the linear theory, when the fluid layer is convectively unstable, gravity modes are evanescent waves. However, in simple two-dimensional numerical settings, we find that when the equilibrium structure is modified by coherent large-scale convective motions, the waves injected at the bottom of the layer are no longer evanescent. In this situation, gravity waves can be detected at the surface of the layer. In our simplified model the injected wave's frequency remains unchanged, but its amplitude has a spatial modulation determined by the convective structure. This result may explain some analyses done with the proper orthogonal decomposition method of the solar surface velocity field even though solar convection is far more complex than the convection model considered here.

Onofri, M.; Vecchio, A.; Veltri, P. [Dipartimento di Fisica, Universita della Calabria, via P. Bucci, 87036 Rende (Italy); De Masi, G., E-mail: onofri@fis.unical.it [Consorzio RFX, Associazione EURATOM-ENEA sulla Fusione, 35127 Padova (Italy)

2012-02-10T23:59:59.000Z

294

Performance Variability  

NLE Websites -- All DOE Office Websites (Extended Search)

Variability Variability of Highly Parallel Architectures William T.C. Kramer 1 and Clint Ryan 2 1 Department of Computing Sciences, University of California at Berkeley and the National Energy Research Scientific Computing Center, Lawrence Berkeley National Laboratory 2 Department of Computing Sciences, University of California at Berkeley Abstract. The design and evaluation of high performance computers has concentrated on increasing computational speed for applications. This performance is often measured on a well configured dedicated sys- tem to show the best case. In the real environment, resources are not always dedicated to a single task, and systems run tasks that may influ- ence each other, so run times vary, sometimes to an unreasonably large extent. This paper explores the amount of variation seen across four large distributed memory systems in a systematic manner. It then

295

The Impact of Airmass Boundaries on the Propagation of Deep Convection: A Modeling-Based Study in a High-CAPE, Low-Shear Environment  

Science Conference Proceedings (OSTI)

A suite of experiments conducted using a cloud-resolving model is examined to assess the role that preexisting airmass boundaries can play in regulating storm propagation. The 27 May 1997 central Texas tornadic event is used to guide these ...

Adam L. Houston; Robert B. Wilhelmson

2012-01-01T23:59:59.000Z

296

Benthic study of the continental slope off Cape Hatteras, North Carolina. Volume 3. Appendices  

SciTech Connect

The Point is an area that supports a most productive pelagic fishery, including tuna, swordfish, marlin, and more. The objective of the study is to analyze video tapes from near the Point, in order to provide data on epibenthic, megafaunal invertebrates including species composition, relative abundances, and large scale (1 km) distribution. The Point is not a defined spot on a chart. Although fishermen do use the steep shelf break for location, they generally look for the west wall of the Gulf Stream. The Point and the oil lease site coincidentally occur where the Gulf Stream parts the continental slope, just north of the eastern-most tip of Cape Hatteras.

Diaz, R.J.; Blake, J.A.; Lohse, D.P.

1993-03-01T23:59:59.000Z

297

Tracer Gas Transport under Mixed Convection Conditions in an Experimental  

NLE Websites -- All DOE Office Websites (Extended Search)

Tracer Gas Transport under Mixed Convection Conditions in an Experimental Tracer Gas Transport under Mixed Convection Conditions in an Experimental Atrium: Comparison Between Experiments and CFD Predictions Title Tracer Gas Transport under Mixed Convection Conditions in an Experimental Atrium: Comparison Between Experiments and CFD Predictions Publication Type Journal Article Year of Publication 2006 Authors Jayaraman, Buvaneswari, Elizabeth U. Finlayson, Michael D. Sohn, Tracy L. Thatcher, Phillip N. Price, Emily E. Wood, Richard G. Sextro, and Ashok J. Gadgil Journal Atmospheric Environment Volume 40 Start Page Chapter Pagination 5236-5250 Keywords airflow and pollutant transport group, atria, indoor airflow and pollutant transport, indoor environment department, indoor pollutant dispersion, mixed convection, turbulence model

298

New Insights Into Deep Convective Core Vertical Velocities Using...  

NLE Websites -- All DOE Office Websites (Extended Search)

Insights Into Deep Convective Core Vertical Velocities Using ARM UHF Wind Profilers For original submission and image(s), see ARM Research Highlights http:www.arm.govscience...

299

Comparison between experiments and CFD predictions of mixed convection...  

NLE Websites -- All DOE Office Websites (Extended Search)

results from a computational fluid dynamics (CFD) simulation of airflow and pollutant dispersion under mixed-convection conditions with experimental data obtained in our 7m x...

300

Thermal Convection: Patterns, Evolution and Stability by M. Lappa  

E-Print Network (OSTI)

Review of the book "Thermal Convection: Patterns, Evolution and Stability" by M. Lappa. Invited by the journal Geophysical and Astrophysical Fluid Dynamics.

Simitev, R D

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "variable convection cape" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Drift Natural Convection and Seepage at the Yucca Mountain Repository  

E-Print Network (OSTI)

multiphase mass and heat transfer processes[26, 33], in bothdrift environment heat transfer processes are a multifacetedof convective heat transfer processes, but how is it that we

Halecky, Nicholaus Eugene

2010-01-01T23:59:59.000Z

302

A Review of Convection Initiation and Motivation for IHOP_2002  

Science Conference Proceedings (OSTI)

The International H2O Project (IHOP_2002) included four complementary research components: quantitative precipitation forecasting, convection initiation, atmospheric boundary layer processes, and instrumentation. This special issue introductory ...

Tammy M. Weckwerth; David B. Parsons

2006-01-01T23:59:59.000Z

303

EIS-0470: U.S. Department of Energy Loan Guarantee for the Cape Wind Energy Project on the Outer Continental Shelf off Massachusetts, Nantucket Sound  

Energy.gov (U.S. Department of Energy (DOE))

The DOE Loan Programs Office is proposing to offer a loan guarantee to Cape Wind Associates, LLC for the construction and start-up of the Cape Wind Energy Project in Nantucket Sound, offshore of Massachusetts. The proposed Cape Wind Energy Project would consist of up to 130, 3.6-MW turbine generators, in an area of roughly 25-square miles, and would include 12.5 miles of 115-kilovolt submarine transmission cable and an electric service platform. To inform DOE's decision regarding a loan guarantee, DOE adopted the Department of the Interior’s 2009 Final Cape Wind Energy Project EIS, in combination with two Cape Wind Environmental Assessments dated May 2010 and April 2011 (per 40 CFR 1506.4), as a DOE Final EIS (DOE/EIS-0470). The adequacy of the Department of the Interior final EIS adopted by DOE is the subject of a judicial action.

304

Diurnal Cycle of Convection at the ARM SGP Site: Role of Large-Scale Forcing, Surface Fluxes, and Convective Inhibition  

NLE Websites -- All DOE Office Websites (Extended Search)

Diurnal Cycle of Convection at the ARM SGP Site: Diurnal Cycle of Convection at the ARM SGP Site: Role of Large-Scale Forcing, Surface Fluxes, and Convective Inhibition G. J. Zhang Center for Atmospheric Sciences Scripps Institution of Oceanography La Jolla, California Introduction Atmospheric convection undergoes strong diurnal variation over both land and oceans (Gray and Jacobson 1977; Dai 2001; Nesbitt and Zipser 2003). Because of the nature of the diurnal variation of solar radiation, the phasing of convection with solar radiation has a significant impact on the atmospheric radiation budget and cloud radiative forcing. A number of studies have investigated the possible mechanisms of the diurnal variation of convection (Gray and Jacobson 1977; Randall et al. 1991; Dai et al. 1999; Dai 2001). Yet, in regional and global climate models, the diurnal variation of

305

Mesoscale Characteristics of Monsoonal Convection and Associated Stratiform Precipitation  

Science Conference Proceedings (OSTI)

Observations undertaken on 12 January 1990 at Darwin, Australia (12°S, 130°E), are used to document the structure of a monsoonal rainband in a low-CAPE, low-shear tropical environment. Dual-Doppler radar analyses are employed to investigate the ...

Thomas D. Keenan; Steven A. Rutledge

1993-02-01T23:59:59.000Z

306

The Relation between Moist Convective Adjustment Schemes and the Mass-Flux Concept for Cumulus Parameterization  

Science Conference Proceedings (OSTI)

The problem of finding convective mass fluxes and convective condensation rates in moist convective adjustment schemes for cumulus parameterization in numerical weather prediction is addressed. Formal considerations reveal that, in general, it is ...

Peter Binder

1993-12-01T23:59:59.000Z

307

The Kinematics of a Midlatitude, Continental Mesoscale Convective System and Its Mesoscale Vortex  

Science Conference Proceedings (OSTI)

The authors present a unique, scale-discriminating study of the environment-relative circulations within a mesoscale convective system (MCS) and mesoscale convective vortex (MCV). The MCS, a leading convective line and trailing stratiform region ...

Jason C. Knievel; Richard H. Johnson

2002-07-01T23:59:59.000Z

308

Analysis of Convectively Coupled Kelvin Waves in the Indian Ocean MJO  

Science Conference Proceedings (OSTI)

The active convective phase of the Madden–Julian oscillation (hereafter active MJO) comprises enhanced moist deep convection on its own temporal and spatial scales as well as increased variance in convection associated with higher-frequency ...

Paul E. Roundy

2008-04-01T23:59:59.000Z

309

Prediction of convective morphology in near-cloud permitting WRF model simulations  

Science Conference Proceedings (OSTI)

The Weather Research and Forecasting (WRF) model’s ability to forecast convective morphological evolution is examined for 37 convective systems. The simulations used Thompson microphysics with 3-km horizontal grid spacing. Ten convective mode ...

Darren V. Snively; William A. Gallus; Jr.

310

The Initiation and Evolution of Multiple Modes of Convection within a Meso-Alpha-Scale Region  

Science Conference Proceedings (OSTI)

On 30 March 2006, a convective episode occurred featuring isolated supercells, a mesoscale convective system (MCS) with parallel stratiform (PS) precipitation, and an MCS with leading stratiform (LS) precipitation. These three distinct convective ...

Adam J. French; Matthew D. Parker

2008-12-01T23:59:59.000Z

311

Structure of a Midtropospheric Vortex Induced by a Mesoscale Convective System  

Science Conference Proceedings (OSTI)

On 9 June 1988 a mesoscale (200-km diameter) convectively generated vortex (MCV) passed through the Colorado wind-profiling network. The generating convective system, which was too small to meet Maddox’s mesoscale convective complex criteria, ...

Diana L. Bartels; John M. Brown; Edward I. Tollerud

1997-02-01T23:59:59.000Z

312

Characterization of Momentum Transport Associated with Organized Moist Convection and Gravity Waves  

Science Conference Proceedings (OSTI)

Tropical convection is inherently multiscalar, involving complex fields of clouds and various regimes of convective organization ranging from small disorganized cumulus up to large organized convective clusters. In addition to being a crucial ...

Todd P. Lane; Mitchell W. Moncrieff

2010-10-01T23:59:59.000Z

313

Orogenic Convection in Subtropical South America as Seen by the TRMM Satellite  

Science Conference Proceedings (OSTI)

Extreme orogenic convective storms in southeastern South America are divided into three categories: storms with deep convective cores, storms with wide convective cores, and storms containing broad stratiform regions. Data from the Tropical ...

Kristen L. Rasmussen; Robert A. Houze Jr.

2011-08-01T23:59:59.000Z

314

Sensitivities of a Squall Line over Central Europe in a Convective-Scale Ensemble  

Science Conference Proceedings (OSTI)

Convective-scale ensemble simulations with perturbed initial and lateral boundary conditions are performed to investigate the mechanisms and sensitivities of a central European convection event from the Convective and Orographically Induced ...

K. E. Hanley; D. J. Kirshbaum; N. M. Roberts; G. Leoncini

2013-01-01T23:59:59.000Z

315

Practical and Intrinsic Predictability of Severe and Convective Weather at the Mesoscales  

Science Conference Proceedings (OSTI)

This study explores both the practical and intrinsic predictability of severe convective weather at the mesoscales using convection-permitting ensemble simulations of a squall line and bow echo event during the Bow Echo and Mesoscale Convective ...

Christopher Melhauser; Fuqing Zhang

2012-11-01T23:59:59.000Z

316

Dynamics of Orographically Triggered Banded Convection in Sheared Moist Orographic Flows  

Science Conference Proceedings (OSTI)

Shallow orographic convection embedded in an unstable cap cloud can organize into convective bands. Previous research has highlighted the important role of small-amplitude topographic variations in triggering and organizing banded convection. ...

Oliver Fuhrer; Christoph Schär

2007-10-01T23:59:59.000Z

317

Convection in a porous medium and mimetic scheme in polar coordinates  

Science Conference Proceedings (OSTI)

Analytical investigation of natural convection of the incompressible fluid in the porous media based on the Darcy hypothesis (Lapwood convection) gives intriguing branching off of one-parameter family of convective patterns. This scenario may be suppressed ...

Bülent Karasözen; Anastasia Trofimova; Vyacheslav Tsybulin

2011-09-01T23:59:59.000Z

318

Cloud-Resolving Simulations of Mesoscale Vortex Intensification and Its Effect on a Serial Mesoscale Convective System  

Science Conference Proceedings (OSTI)

The authors performed numerical simulations of the 27–28 May 1998 mesoscale convective vortex (MCV) and mesoscale convective system (MCS) to understand how the MCV modulated the convection, and how the convection intensified the vortex. The fifth-...

Christopher A. Davis; Stanley B. Trier

2002-12-01T23:59:59.000Z

319

MESA MODELS OF CLASSICAL NOVA OUTBURSTS: THE MULTICYCLE EVOLUTION AND EFFECTS OF CONVECTIVE BOUNDARY MIXING  

SciTech Connect

Novae are cataclysmic variables driven by accretion of H-rich material onto a white dwarf (WD) star from its low-mass main-sequence binary companion. New time-domain observational capabilities, such as the Palomar Transient Factory and Pan-STARRS, have revealed a diversity of their behavior that should be theoretically addressed. Nova outbursts depend sensitively on nuclear physics data, and more readily available nova simulations are needed in order to effectively prioritize experimental effort in nuclear astrophysics. In this paper, we use the MESA stellar evolution code to construct multicycle nova evolution sequences with CO WD cores. We explore a range of WD masses and accretion rates as well as the effect of different cooling times before the onset of accretion. In addition, we study the dependence on the elemental abundance distribution of accreted material and convective boundary mixing at the core-envelope interface. Models with such convective boundary mixing display an enrichment of the accreted envelope with C and O from the underlying WD that is commensurate with observations. We compare our results with the previous work and investigate a new scenario for novae with the {sup 3}He-triggered convection.

Denissenkov, Pavel A.; Herwig, Falk [Department of Physics and Astronomy, University of Victoria, P.O. Box 3055, Victoria, BC V8W 3P6 (Canada)] [Department of Physics and Astronomy, University of Victoria, P.O. Box 3055, Victoria, BC V8W 3P6 (Canada); Bildsten, Lars; Paxton, Bill, E-mail: pavelden@uvic.ca, E-mail: fherwig@uvic.ca, E-mail: bildsten@kitp.ucsb.edu, E-mail: paxton@kitp.ucsb.edu [Kavli Institute for Theoretical Physics and Department of Physics, Kohn Hall, University of California, Santa Barbara, CA 93106 (United States)] [Kavli Institute for Theoretical Physics and Department of Physics, Kohn Hall, University of California, Santa Barbara, CA 93106 (United States)

2013-01-01T23:59:59.000Z

320

Convection with Rotation in a Neutral Ocean: A Study of Open-Ocean Deep Convection  

Science Conference Proceedings (OSTI)

The intensity and scale of the geostrophically adjusted end state of the convective overturning of a homogeneous rotating ocean of depth H at a latitude where the Coriolis parameter is f, induced by surface buoyancy loss of magnitude B0, are ...

Helen Jones; John Marshall

1993-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "variable convection cape" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Radiative-Convective Equilibrium with Explicit Two-Dimensional Moist Convection  

Science Conference Proceedings (OSTI)

Radiative-convective statistical equilibria are obtained using a two-dimensional model in which radiative transfer is interactive with the predicted moisture and cloud fields. The domain is periodic in x, with a width of 640 km, and extends from ...

Isaac M. Held; Richard S. Hemler; V. Ramaswamy

1993-12-01T23:59:59.000Z

322

The Wake Uw in a Midlatitude Mesoseale Convective System Having Complex Convective Organintion  

Science Conference Proceedings (OSTI)

An analysis has been carried out of the surface pressure field in a highly complex mesoscale convective system that occurred on 3-4 June 1985 during the Oklahoma-Kansas Preliminary Regional Expeximent for STORM-Central (OK PRE-STORM). During its ...

Gregory J. Stumpf; Richard H. Johnson; Bradley F. Smull

1991-01-01T23:59:59.000Z

323

Tropical Wave Instabilities: Convective Interaction with Dynamics Using the Emanuel Convective Parameterization  

Science Conference Proceedings (OSTI)

Wave-CISK and evaporation-wind feedback modes, also known as WISHE (wind-induced surface heat exchange) modes, are investigated using a two-dimensional (x?p), hydrostatic, nonrotational model linearized about a basic state in radiative-convective ...

Randy G. Brown; Christopher S. Bretherton

1995-01-01T23:59:59.000Z

324

Natural convection airflow measurement and theory  

DOE Green Energy (OSTI)

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.

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

1984-01-01T23:59:59.000Z

325

East Asian Summer monsoon precipitation systems: rainfall characteristics, storm morphologies and convective properties.  

E-Print Network (OSTI)

??This study attempts to characterize the particular convection type, namely storm morphologies, convective properties, and microphysics, of different weather regimes within the East Asian Summer… (more)

Xu, Weixin

2011-01-01T23:59:59.000Z

326

Parameterization of Convective Precipitation in Mesoscale Numerical Models: A Critical Review  

Science Conference Proceedings (OSTI)

Current approaches for incorporating cumulus convection into mesoscale numerical models are divided into three groups. The traditional approach utilizes cumulus parameterization at convectively unstable points and explicit (nonparameterized) ...

John Molinari; Michael Dudek

1992-02-01T23:59:59.000Z

327

Sensitivity of Tropical Convection to Land Surface Processes  

Science Conference Proceedings (OSTI)

This paper studies the sensitivity of large-scale tropical convection to land surface changes in the general circulation model of the LMD. Ale method of analysis is based on a conceptual model of the energetics of convection applied every day of ...

J. Polcher

1995-09-01T23:59:59.000Z

328

Rapidly Rotating Suns and Active Nests of Convection  

E-Print Network (OSTI)

In the solar convection zone, rotation couples with intensely turbulent convection to drive a strong differential rotation and achieve complex magnetic dynamo action. Our sun must have rotated more rapidly in its past, as is suggested by observations of many rapidly rotating young solar-type stars. Here we explore the effects of more rapid rotation on the global-scale patterns of convection in such stars and the flows of differential rotation and meridional circulation which are self-consistently established. The convection in these systems is richly time dependent and in our most rapidly rotating suns a striking pattern of localized convection emerges. Convection near the equator in these systems is dominated by one or two nests in longitude of locally enhanced convection, with quiescent streaming flow in between at the highest rotation rates. These active nests of convection maintain a strong differential rotation despite their small size. The structure of differential rotation is similar in all of our more rapidly rotating suns, with fast equators and slower poles. We find that the total shear in differential rotation Delta Omega grows with more rapid rotation while the relative shear Delta Omega/Omega_0 decreases. In contrast, at more rapid rotation the meridional circulations decrease in energy and peak velocities and break into multiple cells of circulation in both radius and latitude.

Benjamin P. Brown; Matthew K. Browning; Allan Sacha Brun; Mark S. Miesch; Juri Toomre

2008-08-12T23:59:59.000Z

329

Structure and evolution of a convective band MCS  

E-Print Network (OSTI)

The structure and evolution of the synoptic, mesoscale, and lightning characteristics of the 5 May 1993 non-squall line Mesoscale Convective System has been described. This storm was a long-lived Mesoscale Convective Complex. Its formation was influenced by strong low-level warm advection, weak vorticity advection, and weak vertical. wind shear. Its dissipation occurred as the storm encountered a more stable air mass which may have been influenced by storm induced subsidence. The cyclonic mesoscale circulation of the Mesoscale Convective Complex apparently aided in the formation of new lines of convection behind the primary convective line of the system. This process was repeated twice in the storm life cycle and led to multiple bands of convection. Indeed, this storm had three main lines: the leading line, the trailing one, and the small line near the center of the vortex. As the new lines formed, the vertical transport of momentum disrupted the symmetry of the mesovortex. However, as the line propagated eastward away from the vortex, the symmetric cyclonic circulation re-established itself. This Mesoscale Convective Complex produced flash rates in excess of 1000 h-I for twenty-four consecutive hours. The percentage of positive polarity flashes was higher during the formative and dissipating stages of the storm system. Positive flashes were also enhanced during mergers between convective bands. The flash locations during the mature stage of this storm suggest a bipolar pattern.

Valdes-Manzanilla, Arturo

1995-01-01T23:59:59.000Z

330

Gravity Waves in Shear and Implications for Organized Convection  

Science Conference Proceedings (OSTI)

It is known that gravity waves in the troposphere, which are often excited by preexisting convection, can favor or suppress the formation of new convection. Here it is shown that in the presence of wind shear or barotropic wind, the gravity waves ...

Samuel N. Stechmann; Andrew J. Majda

2009-09-01T23:59:59.000Z

331

Gravity Waves in Shear and Implications for Organized Convection  

E-Print Network (OSTI)

Gravity Waves in Shear and Implications for Organized Convection Samuel N. Stechmann Department, Los Angeles, CA 90095­1555. E-mail: stechmann@math.ucla.edu #12;ABSTRACT It is known that gravity, the gravity waves can create a more favorable environment on one side of preexisting convection than the other

Stechmann, Samuel N.

332

Boundary layer solutions for natural convection in porous media  

DOE Green Energy (OSTI)

An approximate solution is developed for natural convection in porous media resulting from localized heat sources. The method is applicable for moderate levels of convection. Results of the method compare well with those of other calculational methods and with experimental data. The solution for a spherical source can be used as an indirect method for the determination of permeability in some cases.

Hardee, H.C.

1976-05-01T23:59:59.000Z

333

Solar Convection Simulations using a B-spline method  

E-Print Network (OSTI)

This report outlines the development of a B-spline--spectral numerical code for the simulation of convection flows. It allows changing the spatial resolution in all three coordinates as a function of depth, which is especially advantageous for simulations of solar convection.

Hartlep, Thomas

2008-01-01T23:59:59.000Z

334

Solar Convection Simulations using a B-spline method  

E-Print Network (OSTI)

This report outlines the development of a B-spline--spectral numerical code for the simulation of convection flows. It allows changing the spatial resolution in all three coordinates as a function of depth, which is especially advantageous for simulations of solar convection.

Thomas Hartlep; Nagi N. Mansour

2008-05-05T23:59:59.000Z

335

Environmental Distinctions between Cellular and Slabular Convective Lines  

Science Conference Proceedings (OSTI)

The organizational mode of quasi-linear convective systems often falls within a spectrum of modes described by a line of discrete cells on one end (“cellular”) and an unbroken two-dimensional swath of ascent on the other (“slabular”). Convective ...

Richard P. James; J. Michael Fritsch; Paul M. Markowski

2005-09-01T23:59:59.000Z

336

Measurement of Simulated Convective Temperature Distribution Near Ancient Wall Paintings  

Science Conference Proceedings (OSTI)

This study presents a method for measuring the temperature distribution in a confined volume of water used to simulate heat convection in the air. The water was seeded with thermo sensitive crystals as an indicator for the temperature. A 1:10 scale model ... Keywords: air modeling in water, natural convection, thermo-sensitive liquid crystals

V. S. Fonov; C. F. Joeckel; I. Grant

2001-04-01T23:59:59.000Z

337

Climatic regimes of tropical convection and rainfall  

SciTech Connect

Annual distribution and phase propagation of tropical convection are delineated using harmonic and amplitude-phase characteristics analysis of climatological pentad mean outgoing longwave radiation and monthly frequencies of highly reflective cloud. An annual eastward propagation of peak rainy season along the equator from the central Indian Ocean (60[degrees]E) to Arafura Sea (130[degrees]E) is revealed. This indicates a transition from the withdrawal of the Indian summer monsoon to the onset of the Australian summer monsoon. Significant bimodal variations are found around major summer monsoon regions. These variations originate from the interference of two adjacent regimes. The convergence zones over the eastern North Pacific, the South Pacific, and the southwest Indian Ocean are identified as a marine monsoon regime that is characterized by a unimodal variation with a concentrated summer rainfall associated with the development of surface westerlies equatorward of a monsoon trough. Conversely, the central North Pacific and North Atlantic convergence zones between persistent northeast and southeast trades are classified as trade-wind convergence zones; which differ from the marine monsoon regime by their persistent rainy season and characteristic bimodal variation with peak rainy seasons occurring in late spring and fall. The roles of the annual march of sea surface temperature in the phase propagation and formation of various climatic regimes of tropical convection are also discussed. 34 refs., 8 figs., 1 tab.

Wang, Bin (Univ. of Hawaii, Honolulu, HI (United States))

1994-07-01T23:59:59.000Z

338

A MOLTEN SALT NATURAL CONVECTION REACTOR SYSTEM  

SciTech Connect

Fuel-salt volumes external to the core of a molten-salt reactor are calculated for a system in which the fuel salt circulates through the core and primary exchanger by free convection. In the calculation of these volumes, the exchanger heights above the core top range from 5 to 20 ft. Coolants considered for the primary exchanger are a second molten salt and helium. External fuel holdup is found to be the same with either coolant. Two sets of terminal temperatures are selected for the helium. The first combination permits steam generation at 850 psia, 900 deg F. The second set is selected for a closed gas turbine cycle with an 1100 deg F turbine inlet temperature. Specific power (thermal kw/kg 235) is found to be about 900 Mv/kg, based on initial, clean conditions and a 60 Mw (thermal) output. A specific power of 1275 kw/kg is estimated for a forced convection system of the same rating. (auth)

Romie, F.E.; Kinyon, B.W.

1958-02-01T23:59:59.000Z

339

Limiting Factors for Convective Cloud Top Height in the Tropics  

NLE Websites -- All DOE Office Websites (Extended Search)

Limiting Factors for Convective Cloud Top 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. For climate model applications it is therefore important to understand the factors which determine the type of convective cloud that will occur. In this study, we concentrate on describing the factors that limit the cloud-top heights of mid-

340

Patterns of Convection in the Tropical Western Pacific  

NLE Websites -- All DOE Office Websites (Extended Search)

Patterns of Convection in the Tropical Western Pacific 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 western Pacific. The distribution of islands also affects convection in a variety of ways. Atmospheric Radiation Measurement (ARM) Program has three sites in the Tropical Western Pacific (TWP) region, illustrated in Figure 1. The sites are located on Manus, Nauru, and at Darwin, Australia.

Note: This page contains sample records for the topic "variable convection cape" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

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

NLE Websites -- All DOE Office Websites (Extended Search)

govCampaignsYear of Tropical Convection (YOTC) govCampaignsYear of Tropical Convection (YOTC) Campaign Links Year of Tropical Convection Website Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Campaign : Year of Tropical Convection (YOTC) 2008.05.01 - 2010.04.30 Lead Scientist : Sally McFarlane Description Example of a sonde profile available from the ARM Archive The realistic representation of tropical convection in global atmospheric models is a long-standing challenge for weather and global climate models. The lack of fundamental knowledge in this area causes difficulties in modeling and predicting prominent phenomena of the tropical atmosphere such as the inter-tropical convergence zone (ITCZ), El-Nino/Southern Oscillation (ENSO), monsoons, the Madden-Julian Oscillation (MJO), tropical cyclones,

342

BNL | Midlatitude Continental Convective Clouds Experiment (MC3E)  

NLE Websites -- All DOE Office Websites (Extended Search)

Midlatitude Continental Convective Clouds Experiment Midlatitude Continental Convective Clouds Experiment 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

343

An Aircraft Study of Mesoscale Surface Wind Patterns and Associated Meteorological Conditions over Cape St. Francis, South Africa  

Science Conference Proceedings (OSTI)

Aircraft surveys have been conducted to assess the mesoscale pattern of wind and weather over Cape Saint Francis, South Africa, on the southern tip of the African continent. Ten surveys were flown at a level of 100 m above ground during November ...

Mark R. Jury; Roseanne D. Diab; Mark Schormann

1993-10-01T23:59:59.000Z

344

Numerical Simulation Of Sea Breezes with Vertical Wind Shear during Dry Season at Cape of Three Points, West Africa  

Science Conference Proceedings (OSTI)

The airflow over Cape of Three Points (Gulf of Guinea: 4.5°N, 2°W) has been simulated using a three-dimensional mesoscale model in order to investigate the sea breeze developing in synoptic vertical wind shears during the 1979 dry season. Two ...

S. Cautenet; R. Rosset

1989-02-01T23:59:59.000Z

345

The Diurnal Cycle of the Boundary Layer, Convection, Clouds, and Surface Radiation in a Coastal Monsoon Environment (Darwin Australia)  

SciTech Connect

The diurnal variation of convection and associated cloud and radiative properties remains a significant issue in global NWP and climate models. This study analyzes observed diurnal variability of convection in a coastal monsoonal environment examining the interaction of convective rain clouds, their associated cloud properties, and the impact on the surface radiation and corresponding boundary layer structure during periods where convection is suppressed or active on the large scale. The analysis uses data from the Tropical Warm Pool International Cloud Experiment (TWP-ICE) as well as routine measurements from the Australian Bureau of Meteorology and the U.S. Department of Energy Atmospheric Radiation Measurement (ARM) program. Both active monsoonal and large-scale suppressed (buildup and break) conditions are examined and demonstrate that the diurnal variation of rainfall is much larger during the break periods and the spatial distribution of rainfall is very different between the monsoon and break regimes. During the active monsoon the total net radiative input to the surface is decreased by more than 3 times the amount than during the break regime - this total radiative cloud forcing is found to be dominated by the shortwave (SW) cloud effects because of the much larger optical thicknesses and persistence of long-lasting anvils and cirrus cloud decks associated with the monsoon regime. These differences in monsoon versus break surface radiative energy contribute to low-level air temperature differences in the boundary layer over the land surfaces.

May, Peter T.; Long, Charles N.; Protat, Alain

2012-08-01T23:59:59.000Z

346

Effects of Varying the Shape of the Convective Heating Profile on Convectively Coupled Gravity Waves and Moisture Modes  

Science Conference Proceedings (OSTI)

The analytical model of convectively coupled gravity waves and moisture modes of Raymond and Fuchs is extended to the case of top-heavy and bottom-heavy convective heating profiles. Top-heavy heating profiles favor gravity waves, while bottom-...

Željka Fuchs; Saska Gjorgjievska; David J. Raymond

2012-08-01T23:59:59.000Z

347

Comparison of the Diurnal Precipitation Cycle in Convection-Resolving and Non-Convection-Resolving Mesoscale Models  

Science Conference Proceedings (OSTI)

The diurnal cycles of rainfall in 5-km grid-spacing convection-resolving and 22-km grid-spacing non-convection-resolving configurations of the Weather Research and Forecasting (WRF) model are compared to see if significant improvements can be ...

Adam J. Clark; William A. Gallus Jr.; Tsing-Chang Chen

2007-10-01T23:59:59.000Z

348

Long-Term Simulations of Thermally Driven Flows and Orographic Convection at Convection-Parameterizing and Cloud-Resolving Resolutions  

Science Conference Proceedings (OSTI)

The purpose of this paper is to validate the representation of topographic flows and moist convection over the European Alps in a convection-parameterizing simulation (CPM; ?x = 6.6 km) and two cloud-resolving simulations (CRM; ?x = 1.1 and 2.2 km)...

Wolfgang Langhans; Juerg Schmidli; Oliver Fuhrer; Susanne Bieri; Christoph Schär

2013-06-01T23:59:59.000Z

349

Package Equivalent Reactor Networks as Reduced Order Models for Use with CAPE-OPEN Compliant Simulation  

SciTech Connect

Engineering simulations of coal gasifiers are typically performed using computational fluid dynamics (CFD) software, where a 3-D representation of the gasifier equipment is used to model the fluid flow in the gasifier and source terms from the coal gasification process are captured using discrete-phase model source terms. Simulations using this approach can be very time consuming, making it difficult to imbed such models into overall system simulations for plant design and optimization. For such system-level designs, process flowsheet software is typically used, such as Aspen Plus® [1], where each component where each component is modeled using a reduced-order model. For advanced power-generation systems, such as integrated gasifier/gas-turbine combined-cycle systems (IGCC), the critical components determining overall process efficiency and emissions are usually the gasifier and combustor. Providing more accurate and more computationally efficient reduced-order models for these components, then, enables much more effective plant-level design optimization and design for control. Based on the CHEMKIN-PRO and ENERGICO software, we have developed an automated methodology for generating an advanced form of reduced-order model for gasifiers and combustors. The reducedorder model offers representation of key unit operations in flowsheet simulations, while allowing simulation that is fast enough to be used in iterative flowsheet calculations. Using high-fidelity fluiddynamics models as input, Reaction Design’s ENERGICO® [2] software can automatically extract equivalent reactor networks (ERNs) from a CFD solution. For the advanced reduced-order concept, we introduce into the ERN a much more detailed kinetics model than can be included practically in the CFD simulation. The state-of-the-art chemistry solver technology within CHEMKIN-PRO allows that to be accomplished while still maintaining a very fast model turn-around time. In this way, the ERN becomes the basis for high-fidelity kinetics simulation, while maintaining the spatial information derived from the geometrically faithful CFD model. The reduced-order models are generated in such a way that they can be easily imported into a process flowsheet simulator, using the CAPE-OPEN architecture for unit operations. The ENERGICO/CHEMKIN-PRO software produces an ERN-definition file that is read by a dynamically linked library (DLL) that can be easily linked to any CAPE-OPEN compliant software. The plug-in unitoperation module has been successfully demonstrated for complex ERNs of coal gasifiers, using both Aspen Plus and COFE process flowsheet simulators through this published CAPE-OPEN interface.

Meeks, E.; Chou, C. -P.; Garratt, T.

2013-03-31T23:59:59.000Z

350

FLUX EMERGENCE IN A MAGNETIZED CONVECTION ZONE  

Science Conference Proceedings (OSTI)

We study the influence of a dynamo magnetic field on the buoyant rise and emergence of twisted magnetic flux ropes and their influence on the global external magnetic field. We ran three-dimensional MHD numerical simulations using the ASH code (anelastic spherical harmonics) and analyzed the dynamical evolution of such buoyant flux ropes from the bottom of the convection zone until the post-emergence phases. The global nature of this model can only very crudely and inaccurately represent the local dynamics of the buoyant rise of the implanted magnetic structure, but nonetheless allows us to study the influence of global effects, such as self-consistently generated differential rotation and meridional circulation, and of Coriolis forces. Although motivated by the solar context, this model cannot be thought of as a realistic model of the rise of magnetic structures and their emergence in the Sun, where the local dynamics are completely different. The properties of initial phases of the buoyant rise are determined essentially by the flux-rope's properties and the convective flows and consequently are in good agreement with previous studies. However, the effects of the interaction of the background dynamo field become increasingly strong as the flux ropes evolve. During the buoyant rise across the convection zone, the flux-rope's magnetic field strength scales as B{proportional_to}{rho}{sup {alpha}}, with {alpha} {approx}current density is observed to precede flux emergence at all longitudes. The geometry, latitude, and relative orientation of the flux ropes with respect to the background magnetic field influences the resulting rise speeds, zonal flow amplitudes (which develop within the flux ropes), and the corresponding surface signatures. This influences the morphology, duration and amplitude of the surface shearing, and the Poynting flux associated with magnetic flux-rope emergence. The emerged magnetic flux influences the system's global polarity, leading in some cases to a polarity reversal while inhibiting the background dynamo from doing so in others. The emerged magnetic flux is slowly advected poleward while being diffused and assimilated by the background dynamo field.

Pinto, R. F.; Brun, A. S., E-mail: rui.pinto@cea.fr [Laboratoire AIM Paris-Saclay, CEA/Irfu Universite Paris-Diderot CNRS/INSU, F-91191 Gif-sur-Yvette (France)

2013-07-20T23:59:59.000Z

351

Reflections on dissipation associated with thermal convection  

E-Print Network (OSTI)

Buoyancy-driven convection is modelled using the Navier-Stokes and entropy equations. It is first shown that the coefficient of heat capacity at constant pressure, c_p, must in general depend explicitly on pressure (i.e. is not a function of temperature alone) in order to resolve a dissipation inconsistency. It is shown that energy dissipation in a statistically steady state is the time-averaged volume integral of - (D P)/(D t) and not that of - alpha T (D P)/(D t). Secondly, in the framework of the anelastic equations derived with respect to the adiabatic reference state, we obtain a condition when the anelastic liquid approximation can be made, gamma -1 << 1, independent of the dissipation number.

Thierry Alboussiere; Yanick Ricard

2012-10-19T23:59:59.000Z

352

Inside the supernova a powerful convective engine  

E-Print Network (OSTI)

We present an extensive study of the inception of supernova explosions by following the evolution of the cores of two massive stars (15 Msun and 25 Msun) in two dimensions. Our calculations begin at the onset of core collapse and stop several 100 ms after the bounce, at which time successful explosions of the appropriate magnitude have been obtained. (...) Guided by our numerical results, we have developed a paradigm for the supernova explosion mechanism. We view a supernova as an open cycle thermodynamic engine in which a reservoir of low-entropy matter (the envelope) is thermally coupled and physically connected to a hot bath (the protoneutron star) by a neutrino flux, and by hydrodynamic instabilities. (...) In essence, a Carnot cycle is established in which convection allows out-of-equilibrium heat transfer mediated by neutrinos to drive low entropy matter to higher entropy and therefore extracts mechanical energy from the heat generated by gravitational collapse. We argue that supernova explosions are ne...

Herant, M; Hix, W R; Fryer, C F; Colgate, S A; Marc Herant; Willy Benz; Chris F Fryer; Stirling Colgate

1994-01-01T23:59:59.000Z

353

Inside the Supernova: A Powerful Convective Engine  

E-Print Network (OSTI)

Condensed Abstract: We present an extensive study of the inception of supernova explosions by following the evolution of the cores of two massive stars (15 Msun and 25 Msun) in two dimensions. Our calculations begin at the onset of core collapse and stop several 100 ms after the bounce, at which time successful explosions of the appropriate magnitude have been obtained. (...) Guided by our numerical results, we have developed a paradigm for the supernova explosion mechanism. We view a supernova as an open cycle thermodynamic engine in which a reservoir of low-entropy matter (the envelope) is thermally coupled and physically connected to a hot bath (the protoneutron star) by a neutrino flux, and by hydrodynamic instabilities. (...) In essence, a Carnot cycle is established in which convection allows out-of-equilibrium heat transfer mediated by neutrinos to drive low entropy matter to higher entropy and therefore extracts mechanical energy from the heat generated by gravitational collapse. We argue that supernova explosions are nearly guaranteed and self-regulated by the high efficiency of the thermodynamic engine. (...) Convection continues to accumulate energy exterior to the neutron star until a successful explosion has occurred. At this time, the envelope is expelled and therefore uncoupled from the heat source (the neutron star) and the energy input ceases. This paradigm does not invoke new or modified physics over previous treatments, but relies on compellingly straightforward thermodynamic arguments. It provides a robust and self-regulated explosion mechanism to power supernovae which is effective under a wide range of physical parameters.

Marc Herant; Willy Benz; W. Raphael Hix; Chris F. Fryer; Stirling Colgate

1994-04-12T23:59:59.000Z

354

Cape Canaveral Air Force Station integrated resource assessment. Volume 3, Resource assessment  

Science Conference Proceedings (OSTI)

The U.S. Air Force (USAF) has tasked the Pacific Northwest Laboratory (PNL) in support of the U.S. Department of Energy (DOE) Federal Energy Management Program (FEMP), to identify, evaluate, and assist in acquiring all cost-effective energy projects at Cape Canaveral Air Force Station (AFS). Projects considered can be either in the form of energy management or energy conservation. The overall efforts of this task are based on a model program PNL is designing to support energy-use decisions in the federal sector. This report provides the results of the fossil fuel and electric energy resource opportunity (ERO) assessments performed by PNL at Cape Canaveral AFS, which is located approximately 10 miles north of Cocoa Beach, Florida. It is a companion report to Volume 1: Executive Summary and Volume 2: Baseline Detail. The results of the analyses of EROs are presented in 11 common energy end-use categories (e.g., boilers and furnaces, service hot water, and building lighting). A narrative description of each ERO is provided, including information on the installed cost, energy and dollar savings, impacts on operations and maintenance (O&M), and, when applicable, a discussion of energy supply and demand, energy security, and environmental issues. Descriptions of the evaluation methodologies and technical and cost assumptions are also provided for each ERO. Summary tables present the cost- effectiveness of energy end-use equipment before and after the implementation of each ERO and present the results of the life-cycle cost (LCC) analysis, indicating the net present value (NPV) and savings-to-investment ratio (SIR) of each ERO.

Sandusky, W.F.; Eichman, C.J.; King, D.A.; McMordie, K.L.; Parker, S.A.; Shankle, S.A.; Wahlstrom, R.R.

1994-03-01T23:59:59.000Z

355

Double Diffusive Natural Convection in a Nuclear Waste Repository  

Science Conference Proceedings (OSTI)

In this study, we conduct a two-dimensional numerical analysis of double diffusive natural convection in an emplacement drift for a nuclear waste repository. In-drift heat and moisture transport is driven by combined thermal- and compositional-induced buoyancy forces. Numerical results demonstrate buoyancy-driven convective flow patterns and configurations during both repository heat-up and cool-down phases. It is also shown that boundary conditions, particularly on the drip-shield surface, have strong impacts on the in-drift convective flow and transport.

Y. Hao; J. Nitao; T.A. Buscheck; Y. Sun

2006-03-28T23:59:59.000Z

356

Workstation-Based Real-Time Mesoscale Modeling Designed for Weather Support to Operations at the Kennedy Space Center and Cape Canaveral Air Station  

Science Conference Proceedings (OSTI)

This paper describes the capabilities and operational utility of a version of the Mesoscale Atmospheric Simulation System (MASS) that has been developed to support operational weather forecasting at the Kennedy Space Center (KSC) and Cape ...

John Manobianco; Gregory E. Taylor; John W. Zack

1996-04-01T23:59:59.000Z

357

The United States' Next Generation of Atmospheric Composition and Coastal Ecosystem Measurements: NASA's Geostationary Coastal and Air Pollution Events (GEO-CAPE) Mission  

Science Conference Proceedings (OSTI)

The Geostationary Coastal and Air Pollution Events (GEO-CAPE) mission was recommended by the National Research Council's (NRC's) Earth Science Decadal Survey to measure tropospheric trace gases and aerosols and coastal ocean phytoplankton, water quality, ...

J. Fishman; L. T. Iraci; J. Al-Saadi; K. Chance; F. Chavez; M. Chin; P. Coble; C. Davis; P. M. DiGiacomo; D. Edwards; A. Eldering; J. Goes; J. Herman; C. Hu; D. J. Jacob; C. Jordan; S. R. Kawa; R. Key; X. Liu; S. Lohrenz; A. Mannino; V. Natraj; D. Neil; J. Neu; M. Newchurch; K. Pickering; J. Salisbury; H. Sosik; A. Subramaniam; M. Tzortziou; J. Wang; M. Wang

2012-10-01T23:59:59.000Z

358

Simulated Convective Lines with Leading Precipitation. Part I: Governing Dynamics  

Science Conference Proceedings (OSTI)

This article, the first of two describing a study in which the authors used idealized numerical simulations to investigate convective lines with leading precipitation, addresses the dynamics governing the systems' structures and individual air ...

Matthew D. Parker; Richard H. Johnson

2004-07-01T23:59:59.000Z

359

The Onset of Convection in the Madden–Julian Oscillation  

Science Conference Proceedings (OSTI)

An observational study of the onset of convection in the Madden–Julian oscillation (MJO) was performed. Composites of radiosonde data from the Comprehensive Aerological Reference Data Set were constructed for an ensemble of tropical stations ...

Susan R. Kemball-Cook; Bryan C. Weare

2001-03-01T23:59:59.000Z

360

Convective Boundary Layers Driven by Nonstationary Surface Heat Fluxes  

Science Conference Proceedings (OSTI)

In this study the response of dry convective boundary layers to nonstationary surface heat fluxes is systematically investigated. This is relevant not only during sunset and sunrise but also, for example, when clouds modulate incoming solar ...

Robert van Driel; Harm J. J. Jonker

2011-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "variable convection cape" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

On the Generation of Convectively Driven Mesohighs Aloft  

Science Conference Proceedings (OSTI)

In an attempt to determine the relative contribution of the direct incorporation of cold air (detrainment from overshooting convective cloud tops) to the production of mesohighs in the vicinity of the tropopause, two numerical simulations were ...

J. M. Fritsch; J. M. Brown

1982-11-01T23:59:59.000Z

362

Mesoscale Convective Complexes in the Western Pacific Region  

Science Conference Proceedings (OSTI)

A climatological study of mesoscale convective complexes (MCCs) during 1983–1985 over the western Pacific region (WPR), using full-disc, enhanced infrared satellite imagery from the Japanese Geostationary Meteorological Satellite is presented.

David Miller; J. M. Fritsch

1991-12-01T23:59:59.000Z

363

Mesoscale Convective Complexes over the Indian Monsoon Region  

Science Conference Proceedings (OSTI)

Full disk infrared satellite imagery from the Indian National Satellite System (INSAT) geostationary meteorological satellite was examined to determine if mesoscale convective complexes (MCCs) frequent the Indian subcontinent (ISC) region. Using ...

Arlenf G. Laing; J. Michael Fritsch

1993-05-01T23:59:59.000Z

364

Resolution Requirements for the Simulation of Deep Moist Convection  

Science Conference Proceedings (OSTI)

The spatial resolution appropriate for the simulation of deep moist convection is addressed from a turbulence perspective. To provide a clear theoretical framework for the problem, techniques for simulating turbulent flows are reviewed, and the ...

George H. Bryan; John C. Wyngaard; J. Michael Fritsch

2003-10-01T23:59:59.000Z

365

Impact of Stochastic Convection on the Ensemble Transform  

Science Conference Proceedings (OSTI)

The impact of stochastic convection on ensembles produced using the ensemble transform (ET) initial perturbation scheme is examined. This note compares the behavior of ensemble forecasts based only on initial ET perturbations with the behavior of ...

Carolyn A. Reynolds; Joao Teixeira; Justin G. McLay

2008-11-01T23:59:59.000Z

366

Tropical Convection and Precipitation Regimes in the Western United States  

Science Conference Proceedings (OSTI)

The authors have documented the relationship between tropical convection and precipitation regimes in the western United States. Circulation patterns associated with precipitation regimes are described and physical mechanisms are proposed. ...

Kingtse C. Mo; R. W. Higgins

1998-09-01T23:59:59.000Z

367

On the Relationship between Tropical Convection and Sea Surface Temperature  

Science Conference Proceedings (OSTI)

Tropical observations show convective activity increasing sharply above sea surface temperatures (SSTs) of around 26°C and then decreasing as the SST exceeds 30°C, with maximum observed SSTs of around 32°C.Although some aspects of this ...

Adrian M. Tompkins

2001-03-01T23:59:59.000Z

368

Precipitation Efficiency of Warm-Season Midwestern Mesoscale Convective Systems  

Science Conference Proceedings (OSTI)

The precipitation efficiencies for mesoscale convective systems (MCS) over the central United States are calculated. During July–September 2000 and June–September 2001, 24 MCS for which sufficient data were available occurred over or near ...

Patrick Market; Stacy Allen; Roderick Scofield; Robert Kuligowski; Arnold Gruber

2003-12-01T23:59:59.000Z

369

Convective Storm Initiation in a Moist Tropical Environment  

Science Conference Proceedings (OSTI)

Radar and satellite data from the Tropical Rainfall Measuring Mission–Large-Scale Biosphere–Atmosphere (TRMM–LBA) project have been examined to determine causes for convective storm initiation in the southwest Amazon region. The locations and ...

Maria Andrea Lima; James W. Wilson

2008-06-01T23:59:59.000Z

370

The Environments of Significant Convective Events in the Western Mediterranean  

Science Conference Proceedings (OSTI)

The environmental characteristics associated with 313 significant convective events in the western Mediterranean are investigated using radiosonde ascents made in Mallorca (Spain). The events are separated into five groups, based on the observed ...

Elisa Tudurí; Clemente Ramis

1997-06-01T23:59:59.000Z

371

Frontogenesis in the Presence of Small Stability to Slantwise Convection  

Science Conference Proceedings (OSTI)

It is often observed that, despite the existence of near neutrality to slantwise convection, rainbands and snowbands can persist for long periods with narrow intense updrafts producing large quantities of precipitation in many cases. This is ...

A. J. Thorpe; K. A. Emanuel

1985-09-01T23:59:59.000Z

372

Survey and evaluation of techniques to augment convective heat transfer  

E-Print Network (OSTI)

This report presents a survey and evaluation of the numerous techniques which have been shown to augment convective heat transfer. These techniques are: surface promoters, including roughness and treatment; displaced ...

Bergles A. E.

1965-01-01T23:59:59.000Z

373

Multiple Convection Patterns and Thermohaline Flow in an Idealized OGCM  

Science Conference Proceedings (OSTI)

This paper investigates how multiple steady states arise in an ocean general circulation model, caused by the fact that many different convection patterns can be stable under the same surface boundary conditions. Two alternative boundary ...

Stefan Rahmstorf

1995-12-01T23:59:59.000Z

374

Factors for the Simulation of Convectively Coupled Kelvin Waves  

Science Conference Proceedings (OSTI)

This study investigates the major factors for the realistic simulation of convectively coupled Kelvin waves (CCKWs) using the National Centers for Environmental Prediction (NCEP) Climate Forecast System (CFS) models. CFS simulations employing ...

Kyong-Hwan Seo; Jin-Ho Choi; Sang-Dae Han

2012-05-01T23:59:59.000Z

375

The Tropical Convective Spectrum. Part I: Archetypal Vertical Structures  

Science Conference Proceedings (OSTI)

A taxonomy of tropical convective and stratiform vertical structures is constructed through cluster analysis of 3 yr of Tropical Rainfall Measuring Mission (TRMM) “warm-season” (surface temperature greater than 10°C) precipitation radar (PR) ...

Dennis J. Boccippio; Walter A. Petersen; Daniel J. Cecil

2005-07-01T23:59:59.000Z

376

Convective Precursors and Predictability in the Tropical Western Pacific  

Science Conference Proceedings (OSTI)

Conditions leading to convective outbreak in the Tropics are investigated by multivariate analysis of sounding and satellite data from the tropical western Pacific area. Circumstances that make the prediction problem difficult are discussed and ...

Steven C. Sherwood

1999-12-01T23:59:59.000Z

377

An Observational Study of Derecho-Producing Convective Systems  

Science Conference Proceedings (OSTI)

This study identifies the common large-scale environments associated with the development of derecho- producing convective systems (DCSs) from a large number of events. Patterns are identified using statistical clustering of the 500-mb ...

Michael C. Coniglio; David J. Stensrud; Michael B. Richman

2004-04-01T23:59:59.000Z

378

A Large Eddy Simulation Intercomparison Study of Shallow Cumulus Convection  

Science Conference Proceedings (OSTI)

This paper reports an intercomparison study on undisturbed trade wind cumulus convection under steady-state conditions as observed during the Barbados Oceanographic and Meteorological Experiment (BOMEX) with 10 large eddy simulation (LES) models. ...

A. Pier Siebesma; Christopher S. Bretherton; Andrew Brown; Andreas Chlond; Joan Cuxart; Peter G. Duynkerke; Hongli Jiang; Marat Khairoutdinov; David Lewellen; Chin-Hoh Moeng; Enrique Sanchez; Bjorn Stevens; David E. Stevens

2003-05-01T23:59:59.000Z

379

Analysis of Convection and Its Association with African Easterly Waves  

Science Conference Proceedings (OSTI)

The association between convection and African easterly wave (AEW) activity over tropical Africa and the tropical Atlantic during the boreal summer is examined using satellite brightness temperature (TB) and ECMWF reanalysis datasets. Spectral ...

Ademe Mekonnen; Chris D. Thorncroft; Anantha R. Aiyyer

2006-10-01T23:59:59.000Z

380

Convection-Evaporation Feedback in the Equatorial pacific  

Science Conference Proceedings (OSTI)

The coupling between convection and surface evaporation is investigated to assess the importance of evaporative cooling in regulating the tropical sea surface temperature. It is found that such a coupling is scale dependent. On timescales of ...

Guang Jun Zhang; V. Ramanathan; Michael J. McPhaden

1995-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "variable convection cape" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Eddy Modulation of Air–Sea Interaction and Convection  

Science Conference Proceedings (OSTI)

Eddy modulation of the air–sea interaction and convection that occurs in the process of mode water formation is analyzed in simulations of a baroclinically unstable wind- and buoyancy-driven jet. The watermass transformation analysis of Walin is ...

Ivana Cerove?ki; John Marshall

2008-01-01T23:59:59.000Z

382

A Linearized Convective Overturning Model for Prediction of Thunderstorm Movement  

Science Conference Proceedings (OSTI)

A linearized model of convective overturning in shear for prediction of storm propagation is presented. Good correspondence between the model and observation is found for a number of case studies of real storms. Supercell storms, however, are an ...

Adrian Marroquin; David J. Raymond

1982-01-01T23:59:59.000Z

383

Observational Analysis of the Predictability of Mesoscale Convective Systems  

Science Conference Proceedings (OSTI)

Mesoscale convective systems (MCSs) have a large influence on the weather over the central United States during the warm season by generating essential rainfall and severe weather. To gain insight into the predictability of these systems, the ...

Israel L. Jirak; William R. Cotton

2007-08-01T23:59:59.000Z

384

Equatorial Atmospheric Waves and Their Association to Convection  

Science Conference Proceedings (OSTI)

Equatorial wave systems and their relationships with convective activity are analyzed in the western and central Pacific regions during the Coupled Ocean–Atmosphere Response Experiment (COARE) intensive observation periods. The study uses ...

P. Pires; J-L. Redelsperger; J-P. Lafore

1997-06-01T23:59:59.000Z

385

A Stereo Photogrammetric Technique Applied to Orographic Convection  

Science Conference Proceedings (OSTI)

This paper describes a technique for photogrammetric analysis of stereo pairs of images that is applied to the study of orographic convection. The technique is designed for use with digital images and assumes detailed knowledge of the camera ...

Joseph A. Zehnder; Jiuxiang Hu; Anshuman Razdan

2007-06-01T23:59:59.000Z

386

Toward Convective Boundary Layer Parameterization: A Scalar Transport Module  

Science Conference Proceedings (OSTI)

Recent results from large-eddy simulations indicate that the eddy diffusivity for scalar diffusion through the top of a convective boundary layer is different from that for diffusion through the bottom. From this, one can show that the eddy ...

John C. Wyngaard

1984-06-01T23:59:59.000Z

387

An Observational Analysis of a Developing Mesoscale Convective Complex  

Science Conference Proceedings (OSTI)

Dual-Doppler radar, surface mesonet, satellite, and upper-air sounding data from the 1985 Preliminary Regional Experiment for STORM-Central field experiment are used to analyze the early growth stages of a mesoscale convective complex (MCC) that ...

Jason E. Nachamkin; Ray L. McAnelly; William R. Cotton

1994-06-01T23:59:59.000Z

388

Transitions in Shallow Convection: An Explanation for Lateral Cell Expansion  

Science Conference Proceedings (OSTI)

A generalized seven-coefficient model of two-dimensional Rayleigh-Bénard convection is presented. The model simulates successfully one means by which lateral cell expansion can occur as the value of the imposed vertical temperature difference is ...

Hai-Ru Chang; Hampton N. Shirer

1984-08-01T23:59:59.000Z

389

Positive Cloud-to-Ground Lightning in Mesoscale Convective Systems  

Science Conference Proceedings (OSTI)

We have examined the characteristics of positive cloud-to-ground lightning flashes in Mesoscale Convective Systems observed during the Oklahoma-Kansas PRE-STORM project in 1985. Lightning frequencies and patterns of ground strike locations are ...

Steven A. Rutledge; Chungu Lu; Donald R. MacGorman

1990-09-01T23:59:59.000Z

390

Physical Characterization of Tropical Oceanic Convection Observed in KWAJEX  

Science Conference Proceedings (OSTI)

The Tropical Rainfall Measuring Mission (TRMM) Kwajalein Experiment (KWAJEX) was designed to obtain an empirical physical characterization of precipitating convective clouds over the tropical ocean. Coordinated datasets were collected by three ...

Sandra E. Yuter; Robert A. Houze Jr.; Eric A. Smith; Thomas T. Wilheit; Edward Zipser

2005-04-01T23:59:59.000Z

391

Equatorial Wave Activity Derived from Fluctuations in Observed Convection  

Science Conference Proceedings (OSTI)

The spectrum of equatorial wave activity propagating vertically into the stratosphere is calculated from high-resolution imagery of the global convective pattern. Synoptic Global Cloud Imagery (GCI), constructed from six satellites simultaneously ...

John W. Bergman; Murry L. Salby

1994-12-01T23:59:59.000Z

392

The Influence of Helicity on Numerically Simulated Convective Storms  

Science Conference Proceedings (OSTI)

A three-dimensional numerical cloud model is used to investigate the influence of storm-relative environmental helicity (SREH) on convective storm structure and evolution, with a particular emphasis on the identification of ambient shear profiles ...

Kelvin K. Droegemeier; Steven M. Lazarus; Robert Davies-Jones

1993-07-01T23:59:59.000Z

393

Further Aspects of Transitions in Two-Dimensional Thermal Convection  

Science Conference Proceedings (OSTI)

In this paper we present the results of numerical investigation of a two-dimensional nonlinear set of Boussinesq equations governing Bénard–Rayleigh convection using spectral representation in the horizontal direction and finite-difference ...

Marina Zivkovi?; Ernest M. Agee

1988-12-01T23:59:59.000Z

394

Observations from Space and Thermal Convection: A Historical Perspective  

Science Conference Proceedings (OSTI)

An abbreviated historical account of the evolution of the satellite meteorology program is presented. Emphasis is placed on the importance of the satellite and its space platform for observing and studying atmospheric convection. Particular ...

Ernest M. Agee

1984-09-01T23:59:59.000Z

395

Sampling Characteristics from Isobaric Floats in a Convective Eddy Field  

Science Conference Proceedings (OSTI)

During the recent Labrador Sea Deep Convection Experiment, numerous isobaric floats were deployed. Interpretation of the quasi-Lagrangian measurements from these floats requires an understanding of any biases that may be introduced by the ...

Sonya Legg; James C. McWilliams

2002-02-01T23:59:59.000Z

396

Wavelet-Compressed Representation of Deep Moist Convection  

Science Conference Proceedings (OSTI)

The capacity of wavelets to effectively represent atmospheric processes under compression is tested by a dataset generated by a cloud-resolving model simulation of deep convective events observed during the Tropical Ocean Global Atmosphere ...

Jun-Ichi Yano; Peter Bechtold; Jean-Luc Redelsperger; Francoise Guichard

2004-06-01T23:59:59.000Z

397

Effects of Rotation on Convective Plumes from Line Segment Sources  

Science Conference Proceedings (OSTI)

Effects of rotation on finite-length line plumes are studied with a three-dimensional nonhydrostatic numerical model. Geophysical convection with this source geometry occurs, for example, as the result of fissure releases of hot hydrothermal ...

J. W. Lavelle; D. C. Smith IV

1996-06-01T23:59:59.000Z

398

VARIATION OF STELLAR ENVELOPE CONVECTION AND OVERSHOOT WITH METALLICITY  

SciTech Connect

We examine how metallicity affects convection and overshoot in the superadiabatic layer of main sequence stars. We present results from a grid of three-dimensional radiation hydrodynamic simulations with four metallicities (Z = 0.040, 0.020, 0.010, 0.001), and spanning a range in effective temperature (4950 < T{sub eff} < 6230). We show that changing the metallicity alters properties of the convective gas dynamics, and the structure of the superadiabatic layer and atmosphere. Our grid of simulations shows that the amount of superadiabaticity, which tracks the transition from efficient to inefficient convection, is sensitive to changes in metallicity. We find that increasing the metallicity forces the location of the transition region to lower densities and pressures, and results in larger mean and turbulent velocities throughout the superadiabatic region. We also quantify the degree of convective overshoot in the atmosphere, and show that it increases with metallicity as well.

Tanner, Joel D.; Basu, Sarbani; Demarque, Pierre [Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520-8101 (United States)] [Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520-8101 (United States)

2013-04-10T23:59:59.000Z

399

Stratospheric Gravity Waves Generated by Multiscale Tropical Convection  

Science Conference Proceedings (OSTI)

The generation of gravity waves by multiscale cloud systems evolving in an initially motionless and thermodynamically uniform environment is explored using a two-dimensional cloud-system-resolving model. The simulated convection has similar depth ...

Todd P. Lane; Mitchell W. Moncrieff

2008-08-01T23:59:59.000Z

400

Organizational Modes of Mesoscale Convective Systems over Central East China  

Science Conference Proceedings (OSTI)

Composite reflectivity Doppler radar data from June to September of 2007--2010 were used to classify mesoscale convective systems (MCSs) over Central East China into seven morphologies. The morphologies included one nonlinear mode (NL) and six ...

Linlin Zheng; Jianhua Sun; Xiaoling Zhang; Changhai Liu

Note: This page contains sample records for the topic "variable convection cape" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

A Climatology of Fatal Convective Wind Events by Storm Type  

Science Conference Proceedings (OSTI)

There are still hundreds of casualties produced by thunderstorm hazards each year in the United States despite the many recent advances in prediction and mitigation of the effects of convective storms. Of the four most common thunderstorm hazards ...

Joseph M. Schoen; Walker S. Ashley

2011-02-01T23:59:59.000Z

402

Extreme Helicity and Intense Convective Towers in Hurricane Bonnie  

Science Conference Proceedings (OSTI)

Helicity was calculated in Hurricane Bonnie (1998) using tropospheric-deep dropsonde soundings from the NASA Convection and Moisture Experiment. Large helicity existed downshear of the storm center with respect to the ambient vertical wind shear. ...

John Molinari; David Vollaro

2008-11-01T23:59:59.000Z

403

Influence of Bulk Convection on Freckle Formation in Castings  

Science Conference Proceedings (OSTI)

compartments, a hot zone and a cold zone as shown in Figure l(a) below. A baffle is used to .... that the bulk convection cell will not distort the flow at the inlet.

404

Representing Convective Organization in Prediction Models by a Hybrid Strategy  

Science Conference Proceedings (OSTI)

The mesoscale organization of precipitating convection is highly relevant to next-generation global numerical weather prediction models, which will have an intermediate horizontal resolution (grid spacing about 10 km). A primary issue is how to ...

Mitchell W. Moncrieff; Changhai Liu

2006-12-01T23:59:59.000Z

405

A Stochastic Parameterization for Deep Convection Based on Equilibrium Statistics  

Science Conference Proceedings (OSTI)

A stochastic parameterization scheme for deep convection is described, suitable for use in both climate and NWP models. Theoretical arguments and the results of cloud-resolving models are discussed in order to motivate the form of the scheme. In ...

R. S. Plant; G. C. Craig

2008-01-01T23:59:59.000Z

406

The Kain–Fritsch Convective Parameterization: An Update  

Science Conference Proceedings (OSTI)

Numerous modifications to the Kain–Fritsch convective parameterization have been implemented over the last decade. These modifications are described, and the motivating factors for the changes are discussed. Most changes were inspired by feedback ...

John S. Kain

2004-01-01T23:59:59.000Z

407

Another Look at the Thermodynamic Equation For Deep Convection  

Science Conference Proceedings (OSTI)

The study considers deep moist convection involving only a liquid-vapor phase change. An alternative form of the classical thermodynamic equation for reversible saturated flow is derived. Four approximate forms of this equation are obtained and ...

Frank B. Lipps; Richard S. Hemler

1980-01-01T23:59:59.000Z

408

Analytical Parameterizations of Diffusion: The Convective Boundary Layer  

Science Conference Proceedings (OSTI)

A brief review is made of data bases which have been used for developing diffusion parameterizations for the convective boundary layer (CBL). A variety of parameterizations for lateral and vertical dispersion, ?y and ?z, are surveyed; some of ...

Gary A. Briggs

1985-11-01T23:59:59.000Z

409

The “Footprint” under a Decaying Tropical Mesoscale Convective System  

Science Conference Proceedings (OSTI)

On 10 February 1993, during the Tropical Ocean Global Atmosphere Coupled Ocean–Atmosphere Response Experiment, the two NOAA WP-3Ds and the NCAR Electra flew under the anvil region of a decaying mesoscale convective system (MCS). Satellite and ...

Mark F. Geldmeier; Gary M. Barnes

1997-11-01T23:59:59.000Z

410

Diabatic Divergence Profiles in Western Pacific Mesoscale Convective Systems  

Science Conference Proceedings (OSTI)

Heating in the atmosphere can be expressed as diabatic divergence ?d, which is nearly equal to the actual horizontal divergence ? in tropical convection. High-quality ? profile measurements from airborne Doppler radar “purls” in ten mesoscale ...

Brian E. Mapes; Robert A. Houze Jr.

1995-05-01T23:59:59.000Z

411

Satellite and Radar Survey of Mesoscale Convective System Development  

Science Conference Proceedings (OSTI)

An investigation of several hundred mesoscale convective systems (MCSs) during the warm seasons (April–August) of 1996–98 is presented. Circular and elongated MCSs on both the large and small scales were classified and analyzed in this study ...

Israel L. Jirak; William R. Cotton; Ray L. McAnelly

2003-10-01T23:59:59.000Z

412

Wintertime Convection in a Gulf stream Warm Core Ring  

Science Conference Proceedings (OSTI)

Wintertime convection creates deep mixed layers which determine the water mass characteristics and potential vorticity for waters in the main pycnocline of the world ocean. Diabatic cooling is most intense in the Northern Hemisphere near the ...

Terrence M. Joyce; Marvel C. Stalcup

1985-08-01T23:59:59.000Z

413

An Investigation of Turbulence Generation Mechanisms above Deep Convection  

Science Conference Proceedings (OSTI)

An investigation of the generation of turbulence above deep convection is presented. This investigation is motivated by an encounter between a commercial passenger aircraft and severe turbulence above a developing thunderstorm near Dickinson, ...

Todd P. Lane; Robert D. Sharman; Terry L. Clark; Hsiao-Ming Hsu

2003-05-01T23:59:59.000Z

414

Dynamic Radiative–Convective Equilibria Using GCM Column Physics  

Science Conference Proceedings (OSTI)

The behavior of a GCM column physics package in a nonrotating, doubly periodic, homogeneous setting with prescribed SSTs is examined. This radiative–convective framework is proposed as a useful tool for studying some of the interactions between ...

Isaac M. Held; Ming Zhao; Bruce Wyman

2007-01-01T23:59:59.000Z

415

Numerical Modeling of Gravity Wave Generation by Deep Tropical Convection  

Science Conference Proceedings (OSTI)

Although convective clouds are known to generate internal gravity waves, the mechanisms responsible are not well understood. The present study seeks to clarify the dynamics of wave generation using a high-resolution numerical model of deep ...

Todd P. Lane; Michael J. Reeder; Terry L. Clark

2001-05-01T23:59:59.000Z

416

RESEARCH CAMPAIGN: The Convective and Orographically Induced Precipitation Study  

Science Conference Proceedings (OSTI)

The international field campaign called the Convective and Orographically-induced Precipitation Study (COPS) took place from June to August 2007 in southwestern Germany/eastern France. The overarching goal of COPS is to advance the quality of ...

Volker Wulfmeyer; Andreas Behrendt; Hans-Stefan Bauer; Christoph Kottmeier; Ulrich Corsmeier; Alan Blyth; George Craig; Ulrich Schumann; Martin Hagen; Susanne Crewell; Paolo Di Girolamo; Cyrille Flamant; Mark Miller; Andrea Montani; Stephen Mobbs; Evelyne Richard; Mathias W. Rotach; Marco Arpagaus; Herman Russchenberg; Peter Schlüssel; Marianne König; Volker Gärtner; Reinhold Steinacker; Manfred Dorninger; David D. Turner; Tammy Weckwerth; Andreas Hense; Clemens Simmer

2008-10-01T23:59:59.000Z

417

Evaluation of Parametric Assumptions for Shallow Cumulus Convection  

Science Conference Proceedings (OSTI)

A large-eddy simulation (LES) model has been utilized to study nonprecipitating Shallow Convective clouds such as observed during the undisturbed BOMEX period in the trade wind areas. By choosing a realistic large-scale forcing the authors have ...

A. P. Siebesma; J. W. M. Cuijpers

1995-03-01T23:59:59.000Z

418

Fluctuations in an Equilibrium Convective Ensemble. Part I: Theoretical Formulation  

Science Conference Proceedings (OSTI)

To provide a theoretical basis for stochastic parameterization of cumulus convection, the equilibrium fluctuations of a field of cumulus clouds under homogeneous large-scale forcing are derived statistically, using the Gibbs canonical ensemble ...

George C. Craig; Brenda G. Cohen

2006-08-01T23:59:59.000Z

419

Equatorial Convectively Coupled Waves in a Simple Multicloud Model  

Science Conference Proceedings (OSTI)

Linear stability results for the multicloud model recently developed by the authors on an equatorial beta plane are presented here. The linearized equations, about a realistic radiative–convective equilibrium (RCE) are projected in the meridional ...

Boualem Khouider; Andrew J. Majda

2008-11-01T23:59:59.000Z

420

Lidar Observations of Banded Convection during BLX83  

Science Conference Proceedings (OSTI)

Lidar observations of clear-air convection during the 1983 Boundary Layer Experiment (BLX83) reveal the presence of elongated, parallel regions of updrafts marked by enhanced aerosol backscattering. These linear (banded) aerosol structures were ...

R. A. Ferrare; J. L. Schols; E. W. Eloranta; R. Coulter

1991-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "variable convection cape" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Spectral Characteristics of the Convective Boundary Layer Over Uneven Terrain  

Science Conference Proceedings (OSTI)

The paper describes a convective boundary layer experiment conducted in April 1978 at the Boulder Atmospheric Observatory, and examines the spectral behavior of wind velocity and temperature from the Observatory's 300 m tower, from aircraft ...

J. C. Kaimal; R. A. Eversole; D. H. Lenschow; B. B. Stankov; P. H. Kahn; J. A. Businger

1982-05-01T23:59:59.000Z

422

The AROME-France Convective-Scale Operational Model  

Science Conference Proceedings (OSTI)

After six years of scientific, technical developments and meteorological validation, the Application of Research to Operations at Mesoscale (AROME-France) convective-scale model became operational at Météo-France at the end of 2008. This paper ...

Y. Seity; P. Brousseau; S. Malardel; G. Hello; P. Bénard; F. Bouttier; C. Lac; V. Masson

2011-03-01T23:59:59.000Z

423

Observed Evolution of Tropical Deep Convective Events and Their Environment  

Science Conference Proceedings (OSTI)

Using a compositing technique, the temporal progression of tropical convective systems and the mean atmospheric state in their vicinity is constructed from a time series of geostationary satellite and operational rawinsonde data. The technique ...

Steven C. Sherwood; Ralph Wahrlich

1999-08-01T23:59:59.000Z

424

Convective Episodes in the East-Central United States  

Science Conference Proceedings (OSTI)

Nine years of composited radar data are investigated to assess the presence of organized convective episodes in the east-central United States. In the eastern United States, the afternoon maximum in thunderstorms is ubiquitous over land. However, ...

Matthew D. Parker; David A. Ahijevych

2007-11-01T23:59:59.000Z

425

Meso- and Submesoscale Structure of a Convecting Field  

Science Conference Proceedings (OSTI)

Intensive data collection in the region of the Labrador Sea northwest of former Ocean Weather Station Bravo during the winter of 1998 allowed examination of the meso- and submesoscale structure during active convection. Data used include ...

Elizabeth L. Steffen; Eric A. D'Asaro

2004-01-01T23:59:59.000Z

426

Circulations between Mesoscale Convective Systems along a Cold Front  

Science Conference Proceedings (OSTI)

A frontal squall line that passed over the central United States on 14–15 June 1985 consisted of several primary mesoscale convective systems (MCSs) with a prominent gap (several hundred kilometers wide) between two of them over central Kansas ...

Richard H. Johnson; Barbara D. Miner; Paul E. Ciesielski

1995-03-01T23:59:59.000Z

427

Deep Convective System Evolution over Africa and the Tropical Atlantic  

Science Conference Proceedings (OSTI)

In the tropical African and neighboring Atlantic region there is a strong contrast in the properties of deep convection between land and ocean. Here, satellite radar observations are used to produce a composite picture of the life cycle of ...

Joanna M. Futyan; Anthony D. Del Genio

2007-10-01T23:59:59.000Z

428

Synoptic Wave Perturbations and Convective Systems over Equatorial Africa  

Science Conference Proceedings (OSTI)

Spectral analysis of the outgoing longwave radiation (OLR) time series over equatorial Africa reveals large oscillations of the convection with periods of between 3 and 6 days. In March and April, when the intertropical convergence zone (ITCZ) ...

Hanh Nguyen; Jean-Philippe Duvel

2008-12-01T23:59:59.000Z

429

Synoptic Mapping of Convective Structure from Undersampled Satellite Observations  

Science Conference Proceedings (OSTI)

Climate properties regulated by convection, such as water vapor, cloud cover, and related distributions, are undersampled in asynoptic data from an individual orbiting platform, which must therefore be restricted to time-mean distributions. A ...

Murry Salby; Fabrizio Sassi

2001-05-01T23:59:59.000Z

430

Sensitivity of Boundary-layer and Deep Convective Cloud Simulations...  

NLE Websites -- All DOE Office Websites (Extended Search)

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...

431

Transient Environmental Sensitivities of Explicitly Simulated Tropical Convection  

Science Conference Proceedings (OSTI)

A three-dimensional cloud-resolving model, maintained in a statistically steady convecting state by tropics-like forcing, is subjected to sudden (10 min) stimuli consisting of horizontally homogeneous temperature and/or moisture sources with ...

Stefan N. Tulich; Brian E. Mapes

2010-04-01T23:59:59.000Z

432

A Stochastic Model for the Transition to Strong Convection  

Science Conference Proceedings (OSTI)

A simple stochastic model is designed and analyzed in order to further understand the transition to strong convection. The transition has been characterized recently in observational data by an array of statistical measures, including (i) a sharp ...

Samuel N. Stechmann; J. David Neelin

2011-12-01T23:59:59.000Z

433

Gravity Waves and Convection in Colorado during July 1983  

Science Conference Proceedings (OSTI)

In order to gain insight into the complex dynamics of a convective system interacting with a gravity wave train, we have carried out an experiment in northeast Colorado during July and August, 1983, utilizing data from several program areas in ...

F. Einaudi; W. L. Clark; J. L. Green; T. E. VanZandt; D. Fua

1987-06-01T23:59:59.000Z

434

Structure of Large-Scale Convective Anomalies over Tropical Oceans  

Science Conference Proceedings (OSTI)

Geographical variations in the variance and cross-correlation of monthly mean sea surface temperature (SST), outgoing longwave radiation (OLR, a proxy for deep convection and vertical motion), and convergence of winds at the surface and at 850 mb ...

David S. Gutzler; Tamara M. Wood

1990-04-01T23:59:59.000Z

435

Overview of the Convection and Moisture Experiment (CAMEX)  

Science Conference Proceedings (OSTI)

This paper presents an overview of the Convection and Moisture Experiment (CAMEX), including the field operations, aircraft platforms and missions, instrumentation, and data acquired during 1998 and 2001 field campaigns. A total of eight tropical ...

Ramesh Kakar; Michael Goodman; Robbie Hood; Anthony Guillory

2006-01-01T23:59:59.000Z

436

Organizational Modes of Mesoscale Convective Systems over Central East China  

Science Conference Proceedings (OSTI)

Composite reflectivity Doppler radar data from June to September of 2007–2010 were used to classify mesoscale convective systems (MCSs) over central east China into seven morphologies. The morphologies included one nonlinear mode (NL) and six ...

Linlin Zheng; Jianhua Sun; Xiaoling Zhang; Changhai Liu

2013-10-01T23:59:59.000Z

437

Large-Eddy Simulation of the Convective Atmospheric Boundary Layer  

Science Conference Proceedings (OSTI)

Large-eddy simulations of a free convective atmospheric boundary layer with an overlying capping inversion are considered. Attention is given to the dependence of the results upon the various factors influencing the simulation: the subgrid model, ...

P. J. Mason

1989-06-01T23:59:59.000Z

438

Impact of Stochastic Physics in a Convection-Permitting Ensemble  

Science Conference Proceedings (OSTI)

A stochastic physics scheme is tested in the Application of Research to Operations at Mesoscale (AROME) short-range convection-permitting ensemble prediction system. It is an adaptation of ECMWF’s stochastic perturbation of physics tendencies (...

François Bouttier; Benoît Vié; Olivier Nuissier; Laure Raynaud

2012-11-01T23:59:59.000Z

439

Climatology of Tropical Intraseasonal Convective Anomalies: 1979–2002  

Science Conference Proceedings (OSTI)

Tropical intraseasonal convective anomalies (TICA) have a central role in subseasonal changes in the coupled ocean–atmosphere system, but the climatology of TICA events has not been properly documented. This study exploits 24 years of outgoing ...

Charles Jones; Leila M. V. Carvalho; R. Wayne Higgins; Duane E. Waliser; J-K. E. Schemm

2004-02-01T23:59:59.000Z

440

Circulation Anomalies Associated with Tropical Convection during Northern Winter  

Science Conference Proceedings (OSTI)

Lagged cross correlations between outgoing longwave radiation (OLR) and National Meteorological Center global analyses are utilized to isolate the preferred upper-level and surface circulation anomalies associated with tropical convection during ...

George N. Kiladis; Klaus M. Weickmann

1992-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "variable convection cape" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Reply to “Comments on ‘Preconditioning Deep Convection with Cumulus Congestus’”  

Science Conference Proceedings (OSTI)

In his comment, D. M. Schultz asked for clarification concerning (i) the validity of the results of C. Hohenegger and B. Stevens for the development of convection over the midlatitudes and (ii) the exact meaning and computation of the term “...

Cathy Hohenegger; Bjorn Stevens

2013-12-01T23:59:59.000Z

442

A Forced Gravity Wave Model of Serf-Organizing Convection  

Science Conference Proceedings (OSTI)

A two-dimensional, hydrostatic, nonrotating numerical model with a cumulus paramelerizafion is developed to study the early stages of mesozcale convective systems. Amplifying, forced gravity waves occur when peneirative downdrafts are present. ...

David J. Raymond

1987-12-01T23:59:59.000Z

443

Upscale Effects of Deep Convection during the North American Monsoon  

Science Conference Proceedings (OSTI)

The ability of deep monsoon convection to influence the larger-scale circulation over North America is investigated for a 6-day long case study during the 2006 North American monsoon season. Results from Rossby wave ray tracing and numerical ...

David J. Stensrud

444

Processes of Hydrometeor Development in Oklahoma Convective Clouds  

Science Conference Proceedings (OSTI)

This study employs in situ measurements to examine cloud conditions in which hydrometeors develop in mature Oklahoma convective clouds and to develop hypotheses as to how they formed. The measurements were made from penetrations on six days using ...

Andrew J. Heymsfield; Mark R. Hjelmfelt

1984-10-01T23:59:59.000Z

445

The Role of Convective Instability in an Oklahoma Squall Line  

Science Conference Proceedings (OSTI)

Previous investigations of the 8 June 1966 National Severe Storms Laboratory case show that mesoscale lift from an “inland sea breeze” due to a newly formed temperature gradient preceded convection. Using additional surface data, this case was ...

Frank P. Colby Jr.

1980-09-01T23:59:59.000Z

446

Airborne Doppler Lidar Observations of Convective Phenomena in Oklahoma  

Science Conference Proceedings (OSTI)

On 30 June 1981, the wind fields around a variety of convective clouds, ranging from large thunderstorm complexes to isolated cumulus congestus, were observed in Oklahoma using an airborne Doppler lidar operated by the National Aeronautics and ...

Eugene W. McCaul Jr.; Howard B. Bluestein; Richard J. Doviak

1987-09-01T23:59:59.000Z

447

Comparing Model-produced Convective Cloudiness with Observations  

Science Conference Proceedings (OSTI)

Convective cloudiness generated by a cumulus parameterization scheme of a large-scale numerical weather prediction model was compared with analyses of clouds observed by geosynchronous satellites. The comparisons were performed over an equatorial ...

D. C. Norquist; C. Yang

1992-05-01T23:59:59.000Z

448

Midlevel Cyclonic Vortices Generated by Mesoseale Convective Systems  

Science Conference Proceedings (OSTI)

Despite the large number of convective systems that occur over the central United States every year, there are typically only a few well-defined, midlevel vortices apparent in satellite imagery after the overlying anvil debris from some ...

Diana L. Bartels; Robert A. Maddox

1991-01-01T23:59:59.000Z

449

Convectively Driven Mixing in the Bottom Boundary Layer  

Science Conference Proceedings (OSTI)

Closely spaced vertical profiles through the bottom boundary layer over a sloping continental shelf during relaxation from coastal upwelling reveal structure that is consistent with convectively driven mixing. Parcels of fluid were observed ...

J. N. Moum; A. Perlin; J. M. Klymak; M. D. Levine; T. Boyd; P. M. Kosro

2004-10-01T23:59:59.000Z

450

Atlantic Tropical Cyclogenesis: A Three-Way Interaction between an African Easterly Wave, Diurnally Varying Convection, and a Convectively Coupled Atmospheric Kelvin Wave  

Science Conference Proceedings (OSTI)

This paper explores a three-way interaction between an African easterly wave (AEW), the diurnal cycle of convection over the Guinea Highlands (GHs), and a convectively coupled atmospheric equatorial Kelvin wave (CCKW). These interactions resulted ...

Michael J. Ventrice; Christopher D. Thorncroft; Matthew A. Janiga

2012-04-01T23:59:59.000Z

451

Applicability of Large-Scale Convection and Condensation Parameterization to Meso-?-Scale HIRLAM: A Case Study of a Convective Event  

Science Conference Proceedings (OSTI)

This paper presents a case study of a single cold air outbreak event with widespread convective precipitation over southern Finland on 25 May 2001. The purpose of the study is to investigate the applicability of the convection and condensation ...

Sami Niemelä; Carl Fortelius

2005-08-01T23:59:59.000Z

452

The Impact of Large-Scale Forcing on Skill of Simulated Convective Initiation and Upscale Evolution with Convection-Allowing Grid Spacings in the WRF  

Science Conference Proceedings (OSTI)

A set of mesoscale convective systems (MCSs) was simulated using the Weather Research and Forecasting model with 3-km grid spacing to investigate the skill at predicting convective initiation and upscale evolution into an MCS. Precipitation was ...

Jeffrey D. Duda; William A. Gallus Jr.

2013-08-01T23:59:59.000Z

453

An Analytical Study of the Dependence of Orientation and Propagation of the Arabian Sea Convection Bands on Wind Shear, Static Stability, and Preexisting Convection  

Science Conference Proceedings (OSTI)

Organization of convection into bands over the Arabian Sea during a monsoon onset was studied analytically. Observed vertical profiles of temperature, moisture, and wind velocity were used as base states by a linear model of convection to deduce ...

John R. Roadcap; Gandikota V. Rao

1993-06-01T23:59:59.000Z

454

A Numerical Sensitivity Study on the Impact of Soil Moisture on Convection-Related Parameters and Convective Precipitation over Complex Terrain  

Science Conference Proceedings (OSTI)

The impact of soil moisture on convection-related parameters and convective precipitation over complex terrain is studied by numerical experiments using the nonhydrostatic Consortium for Small-Scale Modeling (COSMO) model. For 1 day of the ...

Christian Barthlott; Norbert Kalthoff

2011-12-01T23:59:59.000Z

455

Interannual to Diurnal Variations in Tropical and Subtropical Deep Convective Clouds and Convective Overshooting from Seven Years of AMSU-B Measurements  

Science Conference Proceedings (OSTI)

This study surveys interannual to diurnal variations of tropical deep convective clouds and convective overshooting using the Advanced Microwave Sounding Unit B (AMSU-B) aboard the NOAA polar orbiting satellites from 1999 to 2005. The methodology ...

Gang Hong; Georg Heygster; Justus Notholt; Stefan A. Buehler

2008-09-01T23:59:59.000Z

456

The Convective Instability Pathway to Warm Season Drought in Texas. Part I: The Role of Convective Inhibition and Its Modulation by Soil Moisture  

Science Conference Proceedings (OSTI)

This research is designed to investigate how convective instability influences monthly mean precipitation in Texas in the summertime and to examine the modulation of convective instability and precipitation by local and regional forcings. Since ...

Boksoon Myoung; John W. Nielsen-Gammon

2010-09-01T23:59:59.000Z

457

Handbook of single-phase convective heat transfer  

Science Conference Proceedings (OSTI)

This book presents a comprehensive collection of convective heat transfer basics, methods of calculations, tables, charts and design parameters involving single-phase flows - the most commonly experienced mode in heat transfer problems. Topics covered include natural and forced convection under a wise variety of design conditions, such as ducts, crossflows, turbulent conditions, transitional states, curved and coiled ducts, over rods in metals and through bends, valves and fittings. The book provides sections on radiation interaction and fouling conditions.

Kakac, S.; Shah, R.K.; Aung, W.

1987-01-01T23:59:59.000Z

458

SCALE ANALYSIS OF CONVECTIVE MELTING WITH INTERNAL HEAT GENERATION  

SciTech Connect

Using a scale analysis approach, we model phase change (melting) for pure materials which generate internal heat for small Stefan numbers (approximately one). The analysis considers conduction in the solid phase and natural convection, driven by internal heat generation, in the liquid regime. The model is applied for a constant surface temperature boundary condition where the melting temperature is greater than the surface temperature in a cylindrical geometry. We show the time scales in which conduction and convection heat transfer dominate.

John Crepeau

2011-03-01T23:59:59.000Z

459

POSSIBLE SOLAR CYCLE VARIATIONS IN THE CONVECTION ZONE  

E-Print Network (OSTI)

Abstract. Using data from the Global Oscillations Network Group (GONG) that covers the period from 1995 to 1998 we study the change in frequencies of solar oscillations with solar activity. From these frequencies we attempt to determine any possible variation in solar structure with solar activity. We do not find any evidence of a change in the convection zone depth or extent of overshoot below the convection zone during the solar cycle.

Sarbani Basu; H. M. Antia

2008-01-01T23:59:59.000Z

460

TURBULENT CONVECTION MODEL IN THE OVERSHOOTING REGION. II. THEORETICAL ANALYSIS  

SciTech Connect

Turbulent convection models (TCMs) are thought to be good tools to deal with the convective overshooting in the stellar interior. However, they are too complex to be applied to calculations of stellar structure and evolution. In order to understand the physical processes of the convective overshooting and to simplify the application of TCMs, a semi-analytic solution is necessary. We obtain the approximate solution and asymptotic solution of the TCM in the overshooting region, and find some important properties of the convective overshooting. (1) The overshooting region can be partitioned into three parts: a thin region just outside the convective boundary with high efficiency of turbulent heat transfer, a power-law dissipation region of turbulent kinetic energy in the middle, and a thermal dissipation area with rapidly decreasing turbulent kinetic energy. The decaying indices of the turbulent correlations k, u{sub r}'T'-bar, and T'T'-bar are only determined by the parameters of the TCM, and there is an equilibrium value of the anisotropic degree {omega}. (2) The overshooting length of the turbulent heat flux u{sub r}'T'-bar is about 1H{sub k} (H{sub k} = |dr/dln k|). (3) The value of the turbulent kinetic energy at the convective boundary k{sub C} can be estimated by a method called the maximum of diffusion. Turbulent correlations in the overshooting region can be estimated by using k{sub C} and exponentially decreasing functions with the decaying indices.

Zhang, Q. S.; Li, Y., E-mail: zqs@ynao.ac.cn, E-mail: ly@ynao.ac.cn [National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011 (China)

2012-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "variable convection cape" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

AN ANALYTIC RADIATIVE-CONVECTIVE MODEL FOR PLANETARY ATMOSPHERES  

Science Conference Proceedings (OSTI)

We present an analytic one-dimensional radiative-convective model of the thermal structure of planetary atmospheres. Our model assumes that thermal radiative transfer is gray and can be represented by the two-stream approximation. Model atmospheres are assumed to be in hydrostatic equilibrium, with a power-law scaling between the atmospheric pressure and the gray thermal optical depth. The convective portions of our models are taken to follow adiabats that account for condensation of volatiles through a scaling parameter to the dry adiabat. By combining these assumptions, we produce simple, analytic expressions that allow calculations of the atmospheric-pressure-temperature profile, as well as expressions for the profiles of thermal radiative flux and convective flux. We explore the general behaviors of our model. These investigations encompass (1) worlds where atmospheric attenuation of sunlight is weak, which we show tend to have relatively high radiative-convective boundaries; (2) worlds with some attenuation of sunlight throughout the atmosphere, which we show can produce either shallow or deep radiative-convective boundaries, depending on the strength of sunlight attenuation; and (3) strongly irradiated giant planets (including hot Jupiters), where we explore the conditions under which these worlds acquire detached convective regions in their mid-tropospheres. Finally, we validate our model and demonstrate its utility through comparisons to the average observed thermal structure of Venus, Jupiter, and Titan, and by comparing computed flux profiles to more complex models.

Robinson, Tyler D. [Astronomy Department, University of Washington, Box 351580, Seattle, WA 98195-1580 (United States); Catling, David C., E-mail: robinson@astro.washington.edu [Department of Earth and Space Sciences, University of Washington, Box 351310, Seattle, WA 98195-1310 (United States)

2012-09-20T23:59:59.000Z

462

Energy Analysis of Convectively Induced Wind Perturbations  

Science Conference Proceedings (OSTI)

Budgets of divergent and rotational components of kinetic energy (KD and KR) are examined for four upper level wind speed maxima that develop during the fourth Atmospheric Variability Experiment (AVE IV) and the first AVE-Severe Environmental ...

Henry E. Fuelberg; Dennis E. Buechler

1989-04-01T23:59:59.000Z

463

Tropical Island Convection in the Absence of Significant Topography. Part I: Life Cycle of Diurnally Forced Convection  

Science Conference Proceedings (OSTI)

Diurnally forced convection was observed over the Tiwi Islands, north of the Australian continent, as part of the Maritime Continent Thunderstorm Experiment. Immature peninsula-scale (5–15 km) sea breezes were observed to initiate moist ...

R. E. Carbone; J. W. Wilson; T. D. Keenan; J. M. Hacker

2000-10-01T23:59:59.000Z

464

Comparing the Convective Structure and Microphysics in Two Sahelian Mesoscale Convective Systems: Radar Observations and CRM Simulations  

Science Conference Proceedings (OSTI)

Two mesoscale convective systems (MCSs) observed during the African Monsoon Multidisciplinary Analyses (AMMA) experiment are simulated using the three-dimensional (3D) Goddard Cumulus Ensemble model. This study was undertaken to determine the ...

Nick Guy; Xiping Zeng; Steven A. Rutledge; Wei-Kuo Tao

2013-02-01T23:59:59.000Z

465

Simulated Convective Lines with Parallel Stratiform Precipitation. Part I: An Archetype for Convection in Along-Line Shear  

Science Conference Proceedings (OSTI)

This article, the first of two describing convective lines with parallel stratiform (PS) precipitation, addresses the basic kinematic and precipitation features of these systems. The PS mode appears to be the preferred organizational structure in ...

Matthew D. Parker

2007-02-01T23:59:59.000Z

466

A Satellite-Based Convective Cloud Object Tracking and Multipurpose Data Fusion Tool with Application to Developing Convection  

Science Conference Proceedings (OSTI)

Studying deep convective clouds requires the use of available observation platforms with high temporal and spatial resolution, as well as other non–remote sensing meteorological data (i.e., numerical weather prediction model output, conventional ...

Justin M. Sieglaff; Daniel C. Hartung; Wayne F. Feltz; Lee M. Cronce; Valliappa Lakshmanan

2013-03-01T23:59:59.000Z

467

North Atlantic modeling of low-frequency variability in mode water formation  

E-Print Network (OSTI)

The generation of interannual and near-decadal variability in the formation of mode waters in the western North Atlantic is investigated in the realistic framework of an isopycnic coordinate ocean model forced with atmospheric data from 1946 to 1988. At Bermuda, the model reproduces quite well the observed potential vorticity and isopycnal depth anomalies associated with the subtropical mode water (STMW). Heat storage and preconditioning of the convective activity are found to be the important factors for the generation of STMW variability, with persistence of cold (warm) conditions, associated with anomalous heat loss (gain) over the western subtropics, being more significant for the generation of the simulated variability than are strong anomalous events in isolated years. In the Labrador Sea, the model captures the phase and order of magnitude of the observed near-decadal variability in the convective activity, if not its maximum amplitude. The simulated potential vorticity anomali...

Afonso M. Paiva; Eric P. Chassignet

2001-01-01T23:59:59.000Z

468

Effects of cumulus convection on the simulated monsoon circulation in a general circulation model  

SciTech Connect

The effect of cumulus convection on the Asian summer monsoon circulation is investigated, using a general circulation model. Two simulations for the summer months (June, July, and August) are performed, one parameterizing convection using a mass flux scheme and the other without convective parameterization. The results show that convection has significant effects on the monsoon circulation and its associated precipitation. In the simulation with the mass flux convective parameterization, precipitation in the western Pacific is decreased, together with a decrease in surface evaporation and wind speed. In the indian monsoon region it is almost the opposite. Comparison with a simulation using moist convective adjustment to parameterize convection shows that the monsoon circulation and precipitation distribution in the no-convection simulation are very similar to those in the simulation with moist convective adjustment. The difference in the large-scale circulation with and without convective parameterization is interpreted in terms of convective stabilization of the atmosphere by convection, using dry and moist static energy budgets. It is shown that weakening of the low-level convergence in the western Pacific in the simulation with convection is closely associated with the stabilization of the atmosphere by convection, mostly through drying of the lower troposphere; changes in low-level convergence lead to changes in precipitation. The precipitation increase in the Indian monsoon can be explained similarly. 29 refs., 12 figs.

Zhang, Guang Jun (Univ. of California, San Diego, La Jolla, CA (United States))

1994-09-01T23:59:59.000Z

469

Physics of greenhouse effect and convection in warm Oceans  

SciTech Connect

Sea surface temperatures (SST) in roughly 50% of the tropical Pacific Ocean is warm enough (SST > 300 K) to permit deep convection. This paper examines the effects of deep convection on the climatological mean vertical distributions of water vapor and its greenhouse effect over such warm oceans. The study also examines the link between SST, vertical distribution of water vapor, and its greenhouse effect in the tropical oceans. The radiation model calculations do not include the effects of clouds. The data are grouped into nonconvective and convective categories using SST as an index for convective activity. On average, convective regions are more humid, trap significantly more longwave radiation, and emit more radiation to the sea surface. The greenhouse effect in regions of convection operates as per classical ideas, that is, as the SST increases, the atmosphere traps the excess longwave energy emitted by the surface and reradiates it locally back to the ocean surface. The important departure from the classical picture is that the net (up minus down) fluxes at the surface and at the top-of-the atmosphere decrease with an increase in SST; that is, the surface and the surface-troposphere column lose the ability to radiate the excess energy to space. The cause of this upper greenhouse effect at the surface is the rapid increase in the lower-troposphere humidity with SST; that of the column is due to a combination of increase in humidity in the entire column and increase in the lapse rate within the lower troposphere. The increase in the vertical distribution of humidity far exceeds that which can be attributed to the temperature dependence of saturation vapor pressure; that is, the tropospheric relative humidity is larger in convective regions. The positive coupling between SST and the radiative warming of the surface by the water vapor greenhouse effect is also shown to exist on interannual time scales. 35 refs., 17 figs. 4 tabs.

Inamdar, A.K.; Ramanathan, V. (Univ. of California, San Diego, La Jolla, CA (United States))

1994-05-01T23:59:59.000Z

470

TRMM Observations of Intraseasonal Variability in Convective Regimes over the Amazon  

Science Conference Proceedings (OSTI)

This study utilizes the Tropical Rainfall Measuring Mission (TRMM) satellite precipitation radar (PR), lightning imaging sensor (LIS), and passive microwave imager (TMI) data together with ground-based lightning data to investigate the vertical ...

Walter A. Petersen; Stephen W. Nesbitt; Richard J. Blakeslee; Robert Cifelli; Paul Hein; Stephen A. Rutledge

2002-06-01T23:59:59.000Z

471

Predictor Variables of the Maximum Radar Echo Activity on Convective Days  

Science Conference Proceedings (OSTI)

Digital radar data and atmospheric sounding information were analyzed with the intention of beginning a search for atmospheric parameters which are easily attainable, are independent of whether or not clouds are seeded, and either individually or ...

Gerard E. Klazura; Robert G. Pritchard

1980-03-01T23:59:59.000Z

472

Origins of Convective Variability over Equatorial Southern Africa during Austral Summer  

Science Conference Proceedings (OSTI)

Analysis of NOAA/NESS outgoing longwave radiation (OLR) over the greater Africa region reveals a large area of low OLR (5°–20°S, 20°E–40°E) during three austral summers (November through February; 1982/83, 1983/84 and 1984/85). This low OLR area ...

Steven W. Lyons

1991-01-01T23:59:59.000Z

473

Use of CAPE-OPEN Standard in US-UK Collaboration on Virtual Plant Simulation  

Science Conference Proceedings (OSTI)

Under the auspices of a US-UK Memorandum of Understanding and Implementing Agreement for fossil energy R&D (http://us-uk.fossil.energy.gov/), the US Department of Energy’s (DOE) National Energy Technology Laboratory (NETL) and the UK Department of Trade and Industry (DTI) have recently completed a three-year collaboration on virtual plant modeling and simulation technology for advanced fossil-energy power generation systems. The R&D collaboration was aimed at taking full advantage of the synergies between NETL’s ongoing Advanced Process Engineering Co-Simulator (APECS) project and the UK’s three-year Virtual Plant Demonstration Model (VPDM) project. The key objective of this collaboration has been the development of compatible, open standards-based US and UK technology for process/equipment co-simulation. To achieve plug-and-play model interoperability, the collaboration leveraged the process-industry CAPE-OPEN (CO) software standard which is managed and disseminated by the CO Laboratories Network (www.colan.org).

Zitney, S.E.

2007-11-01T23:59:59.000Z

474

CAPE-OPEN Integration for Advanced Process Engineering Co-Simulation  

SciTech Connect

This paper highlights the use of the CAPE-OPEN (CO) standard interfaces in the Advanced Process Engineering Co-Simulator (APECS) developed at the National Energy Technology Laboratory (NETL). The APECS system uses the CO unit operation, thermodynamic, and reaction interfaces to provide its plug-and-play co-simulation capabilities, including the integration of process simulation with computational fluid dynamics (CFD) simulation. APECS also relies heavily on the use of a CO COM/CORBA bridge for running process/CFD co-simulations on multiple operating systems. For process optimization in the face of multiple and some time conflicting objectives, APECS offers stochastic modeling and multi-objective optimization capabilities developed to comply with the CO software standard. At NETL, system analysts are applying APECS to a wide variety of advanced power generation systems, ranging from small fuel cell systems to commercial-scale power plants including the coal-fired, gasification-based FutureGen power and hydrogen production plant.

Zitney, S.E.

2006-11-01T23:59:59.000Z

475

Transient natural convection in heated inclined tubes  

SciTech Connect

To simulate natural convection flow patterns in directionally drilled wellbores, experiments and analyses were conducted for a circular tube with length-to-diameter (L/D) ratio of 36 at angles of 0{degree}, 20{degree}, and 35{degree} from the vertical. The tube was heated at the bottom and cooled at the top, and the insulation was adjusted so that approximately one- to two-thirds of the power dissipated was transferred through the tube wall to the surroundings. An aqueous solution of polyvinyl alcohol was employed as the working fluid in order to obtain low Rayleigh numbers corresponding to conditions in geothermal wellbores. Results were primarily qualitative but were useful in providing insight into the phenomena occurring. Steady-state temperature distributions were measured for the three orientations and for several heating rates to demonstrate the effects of tube angle and Rayleigh number. transient measurements of the temperature distribution were obtained during cooling from a higher temperature without a heat source to calibrate the heat losses. With the electrical heat source, temporal data were taken during heating to examine the approach to steady state. Quasi-steady flow conditions were approached rapidly, but the overall time constant of the apparatus was of the order of one-third of a day. Predictions with the three-dimensional TEMPEST code were first tested by comparison with simple conduction analyses. Comparison with actual data showed good agreement of the predicted temperature levels for the maximum inclination, 35{degree}, and slightly poorer agreement for the other limit, a vertical tube. Trends of temperature level and Nusselt number with heating rate or Rayleigh number were reasonable, but the predicted variation of the end Nusselt number versus inclination was in the opposite direction from the experiment. 75 refs., 20 figs., 8 tabs.

McEligot, D.M. (Westinghouse Electric Corp., Middletown, RI (USA). Oceanic Div.); Denbow, D.A. (Software AG of North America, Inc., Lakewood, CO (USA)); Murphy, H.D. (Los Alamos National Lab., NM (USA))

1990-05-01T23:59:59.000Z

476

The Dependence of Storm Longevity on the Pattern of Deep Convection Initiation in a Low-Shear Environment  

Science Conference Proceedings (OSTI)

The sensitivity of storm longevity to the pattern of deep convection initiation (e.g., multiple, quasi-linearly arranged initial deep convective cells versus an isolated deep convective cell) is examined using idealized cloud-resolving simulations ...

Adam L. Houston; Robert B. Wilhelmson

2011-10-01T23:59:59.000Z

477

Momentum Flux Spectrum of Convective Gravity Waves. Part I: An Update of a Parameterization Using Mesoscale Simulations  

Science Conference Proceedings (OSTI)

The convective source and momentum flux spectra of a parameterization of convective gravity wave drag (GWDC) are validated in a three-dimensional spectral space using mesoscale numerical simulations for various ideal and real convective storms. ...

Hyun-Joo Choi; Hye-Yeong Chun

2011-04-01T23:59:59.000Z

478

A dual mass flux framework for boundary layer convection  

NLE Websites -- All DOE Office Websites (Extended Search)

A dual mass flux framework for boundary layer convection 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 scheme is presented that is currently being developed for the Integrated Forecasting System (IFS) of the European Centre for Medium-range Weather Forecasts (ECMWF). Part of the total turbulent flux is modeled through advective mass flux by multiple updrafts, initialized at the surface. Two groups of updrafts are explicitly represented; i) updrafts that never reach their lifting condensation level, and ii) updrafts that condensate and become cloudy. Key new ingredient is the flexibility of the associated updraft area fractions, as a function of model state. As a result, an extra degree of freedom is introduced in the

479

Title: Radar-observed convective characteristics during TWP-ICE  

NLE Websites -- All DOE Office Websites (Extended Search)

Title: Radar-observed convective characteristics during TWP-ICE Title: Radar-observed convective characteristics during TWP-ICE Schumacher, Courtney Texas A&M University Houze, Robert University of Washington May, Peter Bureau or Meteorology Research Centre Frederick, Kaycee Cetrone, Jasmine Vallgren, Andreas Category: Field Campaigns This poster will describe the radar dataset obtained in the Tropical Warm Pool International Cloud Experiment (TWP-ICE), which is to take place 20 January - 14 February 2006 in the vicinity of Darwin, Australia. We 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 vertically pointing cloud radar and lidar installations. In addition, we will discuss the potential for combining

480

Natural Convection Shutdown Heat Removal Test Facility (NSTF)  

NLE Websites -- All DOE Office Websites (Extended Search)

Natural Convection Natural Convection Shutdown Heat Removal Test Facility Scaling Basis Full Scale Half Scale NSTF Argonne National Laboratory's Natural Convection Shutdown Heat Removal Test Facility (NSTF) - one of the world's largest facilities for ex-vessel passive decay heat removal testing-confirms the performance of reactor cavity cooling systems (RCCS) and similar passive confinement or containment decay heat removal systems in modern Small Modular Reactors. Originally built to aid in the development of General Electric's Power Reactor Innovative Small Module (PRISM) Reactor Vessel Auxiliary Cooling System (RVACS), the NSTF has a long history of providing confirmatory data for the airside of the RVACS. Argonne National Laboratory's NSTF is a state-of-the-art, large-scale facility for evaluating performance

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481

ARM - Midlatitude Continental Convective Clouds (comstock-hvps)  

DOE Data Explorer (OSTI)

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.

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

482

ARM - Midlatitude Continental Convective Clouds (comstock-hvps)  

Science Conference Proceedings (OSTI)

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.

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

2012-01-06T23:59:59.000Z

483

An Idealized Cloud-Resolving Framework for the Study of Midlatitude Diurnal Convection over Land  

Science Conference Proceedings (OSTI)

This paper introduces an idealized cloud-resolving modeling (CRM) framework for the study of midlatitude diurnal convection over land. The framework is used to study the feedbacks among soil, boundary layer, and diurnal convection. It includes a ...

Linda Schlemmer; Cathy Hohenegger; Jürg Schmidli; Christopher S. Bretherton; Christoph Schär

2011-05-01T23:59:59.000Z

484

Radar Analysis of a Tropical Convective Boundary Layer with Shallow Cumulus Clouds  

Science Conference Proceedings (OSTI)

A situation of fair weather cloudy convection is examined using a dual Doppler radar, environmental measurements and cloud photogrammetry. The convective layer is characterized by the interaction between the northward monsoon wind at low levels ...

Laurence Eymard

1984-04-01T23:59:59.000Z

485

Convectively Generated Gravity Waves and Their Effect on the Cloud Environment  

Science Conference Proceedings (OSTI)

This study uses a two-dimensional cloud-resolving model to examine how convectively generated gravity waves modify the environment of an isolated convective cloud. The model is initialized with an idealized sounding, and the cloud is initiated by ...

Todd P. Lane; Michael J. Reeder

2001-08-01T23:59:59.000Z

486

A Satellite Infrared Technique to Estimate Tropical Convective and Stratiform Rainfall  

Science Conference Proceedings (OSTI)

This paper describes a new method of estimating both tropical convective precipitation and stratiform precipitation (produced under the anvils of mature and decaying convective systems) from satellite infrared data. The method, denoted CST (...

Robert F. Adler; Andrew J. Negri

1988-01-01T23:59:59.000Z

487

A Cumulus Parameterization Based on the Generalized Convective Available Potential Energy  

Science Conference Proceedings (OSTI)

This paper reports tests of a cumulus parameterization in which the reference state associated with the generalized convective available potential energy (GCAPE) is chosen as the end-state of the convective adjustment. The GCAPE is defined as the ...

Junyi Wang; David A. Randall

1996-03-01T23:59:59.000Z

488

Exploring the Land–Ocean Contrast in Convective Vigor Using Islands  

Science Conference Proceedings (OSTI)

Moist convection is well known to be generally more intense over continental than maritime regions, with larger updraft velocities, graupel, and lightning production. This study explores the transition from maritime to continental convection by ...

F. J. Robinson; S. C. Sherwood; D. Gerstle; C. Liu; D. J. Kirshbaum

2011-03-01T23:59:59.000Z

489

The Cooperative Convective Precipitation Experiment (CCOPE), 18 May-7 August 1981  

Science Conference Proceedings (OSTI)

The Cooperative Convective Precipitation Experiment, CCOPE, was an outgrowth of the perceived need for more comprehensive data sets on convective clouds. It was planned and executed by a large group of participants, with the leadership of the ...

Charles A. Knight

1982-04-01T23:59:59.000Z

490

The Relationship between Tropical Cyclone Intensity Change and the Strength of Inner-Core Convection  

Science Conference Proceedings (OSTI)

Convective intensity proxies measured by the Tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI), Precipitation Radar (PR), and Visible and Infrared Scanner (VIRS) are used to assess the relationship between intense convection in the ...

Haiyan Jiang

2012-04-01T23:59:59.000Z

491

Observational Evaluation of a Convective Quasi-Equilibrium View of Monsoons  

Science Conference Proceedings (OSTI)

Idealized dynamical theories that employ a convective quasi-equilibrium (QE) treatment for the diabatic effects of moist convection have been used to explain the location, intensity, and intraseasonal evolution of monsoons. This paper examines ...

Ji Nie; William R. Boos; Zhiming Kuang

2010-08-01T23:59:59.000Z

492

A Fractal Interfacial Entrainment Model for Dry Convective Boundary Layers. Part I: Model Description  

Science Conference Proceedings (OSTI)

An entrainment model for the convective planetary boundary layer is presented. It is based upon an ensemble-averaged view of the local entrainment interface that caps the convective mixed layer. Fractal and variational methods are used to ...

Ray F. Kamada

1988-09-01T23:59:59.000Z

493

Development of a Probabilistic Convective Weather Forecast Threshold Parameter for Flight-Routing Decisions  

Science Conference Proceedings (OSTI)

This paper presents a method for determining a threshold value of probabilistic convective weather forecast data. By synchronizing air traffic data and an experimental probabilistic convective weather forecast product, it was observed that ...

Kapil Sheth; Thomas Amis; Sebastian Gutierrez-Nolasco; Banavar Sridhar; Daniel Mulfinger

2013-10-01T23:59:59.000Z

494

Airflow and Precipitation Structure of Two Leading Stratiform Mesoscale Convective Systems Determined from Operational Datasets  

Science Conference Proceedings (OSTI)

An analysis of the airflow and precipitation structure of two leading stratiform (LS) mesoscale convective systems (MCSs) is presented. Leading stratiform systems are defined as linear MCSs that consist of a convective line with leading ...

Crystalyne R. Pettet; Richard H. Johnson

2003-10-01T23:59:59.000Z

495

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

Science Conference Proceedings (OSTI)

By applying a cloud tracking algorithm to tropical convective systems in a simulated a regional high resolution model simulation, this study documents the environmental conditions before and after convective systems are initiated over ocean and ...

Samson Hagos; Zhe Feng; Sally McFarlane; L. Ruby Leung

496

Convective Structures in a Cold Air Outbreak over Lake Michigan during Lake-ICE  

Science Conference Proceedings (OSTI)

The Lake-Induced Convection Experiment provided special field data during a westerly flow cold air outbreak (CAO) on 13 January 1998, which has afforded the opportunity to examine in detail an evolving convective boundary layer. Vertical cross ...

Suzanne M. Zurn-Birkhimer; Ernest M. Agee; Zbigniew Sorbjan

2005-07-01T23:59:59.000Z

497

From Hot Towers to TRMM: Joanne Simpson and Advances in Tropical Convection Research  

Science Conference Proceedings (OSTI)

Joanne Simpson began contributing to advances in tropical convection about half a century ago. The hot tower hypothesis jointly put forth by Joanne Simpson and Herbert Riehl postulated that deep convective clouds populating the “equatorial trough ...

Robert A. Houze Jr.

2003-01-01T23:59:59.000Z

498

Numerical Simulation of Transitions in Boundary Layer Convective Structures in a Lake-Effect Snow Event  

Science Conference Proceedings (OSTI)

Numerical simulations are used to study transitions between boundary layer rolls and more cellular convective structures observed during a lake-effect snow event over Lake Michigan on 17 December 1983. Weak lake-effect nonroll convection was ...

Kevin A. Cooper; Mark R. Hjelmfelt; Russell G. Derickson; David A. R. Kristovich; Neil F. Laird

2000-09-01T23:59:59.000Z

499

Atmospheric Circulation Anomalies during Episodes of Enhanced and Reduced Convective Cloudiness over Uruguay  

Science Conference Proceedings (OSTI)

Regional and large-scale circulation anomalies associated with periods of enhanced and reduced convective cloudiness over Uruguay are studied for austral spring and summer, when rainfall associated with deep convection is more frequent in this ...

Alvaro DÍaz; Patricio Aceituno

2003-10-01T23:59:59.000Z

500

Deep convection triggering by boundary layer thermals. Part 1: LES analysis and stochastic triggering formulation  

Science Conference Proceedings (OSTI)

This paper proposes a new formulation of the deep convection triggering for GCM (General Circulation Model) convective parameterizations. This triggering is driven by evolving properties of the strongest boundary-layer thermals. To investigate ...

Nicolas Rochetin; Fleur Couvreux; Jean-Yves Grandpeix; Catherine Rio