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1

ARM - 2003 ARM Science Team Meeting  

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3 ARM Science Team Meeting 2003 Meeting 2003 Meeting Home Proceedings Sorted by Author Proceedings Sorted by Title Meeting Archives ARM Science Team Meeting Proceedings Past...

2

ARM - 2000 ARM Science Team Meeting  

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0 ARM Science Team Meeting 0 ARM Science Team Meeting 2000 Meeting 2000 Meeting Home Proceedings Sorted by Author Proceedings Sorted by Title Meeting Archives ARM Science Team Meeting Proceedings Past Science Team Meetings 2000 ARM Science Team Meeting March 13 - 17 | San Antonio, Texas | St. Anthony Hotel & The Municipal Auditorium St. Anthony Hotel provided rooms along with the Municipal Auditorium for the 2000 ARM Science Team Meeting. St. Anthony Hotel provided rooms along with the Municipal Auditorium for the 2000 ARM Science Team Meeting. The tenth ARM Science Team Meeting was held in San Antonio, Texas. The Science Team Meetings were intended to provide opportunities to share scientific findings, focused technical exchanges, and collectively examine the implementation and operation of ARM.

3

ARM - Past ARM Science Team Meetings  

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govSciencePast ARM Science Team Meetings Science Research Themes Research Highlights Journal Articles Collaborations Atmospheric System Research (ASR) User Meetings Second Annual...

4

ARM - 1997 ARM Science Team Meeting  

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7 ARM Science Team Meeting 7 ARM Science Team Meeting 1997 Meeting 1997 Meeting Home Proceedings Sorted by Author Proceedings Sorted by Title Meeting Archives ARM Science Team Meeting Proceedings Past Science Team Meetings 1997 ARM Science Team Meeting March 3 -7 | San Antonio, Texas | St. Anthony Hotel & Municipal Auditorium The St. Anthony Hotel as well as the Municipal Auditorium and Conference Center provided rooms and meeting space. The St. Anthony Hotel as well as the Municipal Auditorium and Conference Center provided rooms and meeting space. The seventh ARM Science Team Meeting was held in San Antonio, Texas. This year the ARM Science Team Meeting and the Computer Hardware, Advanced Mathematics and Model Physics (CHAMMP) science team meetings were held jointly. The Science Team Meetings were intended to provide opportunities

5

ARM - 1996 ARM Science Team Meeting  

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6 ARM Science Team Meeting 6 ARM Science Team Meeting 1996 Meeting 1996 Meeting Home Proceedings Sorted by Author Proceedings Sorted by Title Meeting Archives ARM Science Team Meeting Proceedings Past Science Team Meetings 1996 ARM Science Team Meeting March 4 - 7 | San Antonio, Texas | Municipal Auditorium The St. Anthony Hotel, as well as the Municipal Auditorium and Conference Center, provided rooms and meeting space. The St. Anthony Hotel, as well as the Municipal Auditorium and Conference Center, provided rooms and meeting space. The fifth ARM Science Team Meeting was held in San Antonio, Texas, at the Municipal Auditorium and Conference Center. The Science Team Meetings were intended to provide opportunities to share scientific findings, focused technical exchanges, and collectively examine the implementation and

6

ARM - 2007 ARM Science Team Meeting  

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ACRF Infrastructure staff members attended the Seventeenth ARM Science Team Meeting in Monterey, California, from March 26-30, 2007. Dr. Kiran Alapaty, who was appointed as the...

7

ARM - 2006 ARM Science Team Meeting  

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Meeting Meeting 2006 Meeting 2006 Meeting Home Proceedings Sorted by Author Proceedings Sorted by Title Pictures Posters Presentations Meeting Archives ARM Science Team Meeting Proceedings Past Science Team Meetings 2006 ARM Science Team Meeting March 27-18 | Albuquerque, New Mexico | Hyatt Regency Albuquerque The Hyatt Regency - Albequerque The Hyatt Regency - Albequerque Meeting Highlights Just over 300 ARM scientists and ACRF infrastructure staff took part in the 16th ARM Science Team meeting held in Albuquerque, New Mexico, on March 27-31, 2006. After an initial day of focused meetings among the ARM Working Groups, Dr. David Thomassen, Acting Associate Director of DOE's Office of Biological and Environmental Research (BER), opened the meeting's plenary session with remarks about the role of ARM within the DOE, and its

8

ARM - Publications: Science Team Meeting Documents  

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Measurements at the DOE ARM NSA Site Dong, X. and Mace, G.G., University of Utah Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting The Arctic plays...

9

ARM - Publications: Science Team Meeting Documents  

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Radiation Measurement (ARM) Science Team Meeting With the complement of active and passive remote sensors at the four sites, the ARM program has generated (and continues to...

10

ARM - Science Team Meeting Proceedings  

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Publishing Procedures Acronyms Glossary Logos Contacts RSS for Publications Science Team Meeting Proceedings Science Team Meeting Proceedings Note: For proper viewing,...

11

ARM - Publications: Science Team Meeting Documents  

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Min, Q., and Michalsky, J. J., Atmospheric Sciences Research Inst., State University of New York at Albany Ninth Atmospheric Radiation Measurement (ARM) Science Team Meeting We...

12

ARM - Publications: Science Team Meeting Documents  

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Turbulence Properties Derived from MMCR Doppler Moments Mace, G. G., University of Utah Ninth Atmospheric Radiation Measurement (ARM) Science Team Meeting We are developing an...

13

ARM - Publications: Science Team Meeting Documents  

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Factors Vernon, E.N. and Mace, G.G., Department of Meteorology, Unviversity of Utah Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting The extensive...

14

ARM - Publications: Science Team Meeting Documents  

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Millimeter Radar and Microwave Radiometer Data Dong, X. and Mace, G.G., University of Utah Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting A new algorithm...

15

ARM - Publications: Science Team Meeting Documents  

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Cloud Mask Products (MOD35) with MMCR Data Zhang, Q. and Mace, G.G., University of Utah Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting The...

16

ARM - Publications: Science Team Meeting Documents  

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of Cases Sampled During the 2000 Cloud IOP Sonntag, K. and Mace, G.G., University of Utah Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting Quantities...

17

ARM - Publications: Science Team Meeting Documents  

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of Cirrus Cloud Property Retrieval Algorithms Mace, G.G. and Zhang, Y., University of Utah Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting The problem of...

18

ARM - Publications: Science Team Meeting Documents  

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Radiation Measurement (ARM) Science Team Meeting The Desert Research Institute (DRI) instantaneous cloud condensation nuclei (CCN) spectrometer and a 3010 TSI CN counter...

19

ARM - Publications: Science Team Meeting Documents  

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Model for Vector (Polarized) Radiative Transfer Min, Q. and Duan, M., State University of New York at Albany Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting...

20

ARM - Selected Science Team Proposals - FY 2000  

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Codes) Applied to ARM and Landsat Retrievals" Dr. Robert D. Cess, State University of New York, Stony Brook: "Science Team Participation in the Atmospheric Radiation...

Note: This page contains sample records for the topic "arm science team" 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

ARM - Publications: Science Team Meeting Documents  

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Cloud Optical Depth Retrievals DeSlover, D.H. and Knuteson, R.O., University of Wisconsin - Madison Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting Data...

22

ARM - Publications: Science Team Meeting Documents  

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Radiation Measurement (ARM) Science Team Meeting Satellite measurements using passive sensors are more accurate in measuring cloud tops than cloud bases especially in...

23

ARM - Publications: Science Team Meeting Documents  

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Measurement (ARM) Science Team Meeting Measurements by airborne cloud radar and passive instruments such as the CSU Scanning Spectral Polarimeter (SSP) during the recent...

24

ARM - Publications: Science Team Meeting Documents  

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

New Parameterization of Droplet Nucleation Penner, J.E. and Chen, Y., University of Michigan Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting Several...

25

ARM - Publications: Science Team Meeting Documents  

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NASAGoddard Space Flight Center Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting This is a status report for the "International Intercomparison of...

26

ARM - Publications: Science Team Meeting Documents  

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M.J., Brookhaven National Laboratory Ninth Atmospheric Radiation Measurement (ARM) Science Team Meeting The Brookhaven National Laboratory has developed a shipboard radiation...

27

ARM - Publications: Science Team Meeting Documents  

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Northwest National Laboratory (e) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting Aerosol influences on shortwave radiation are substantial locally and...

28

ARM - Publications: Science Team Meeting Documents  

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Radiation Measurement (ARM) Science Team Meeting A retrieval method of photon pathlength distribution using Rotating Shadowband Spectroradiometer (RSS) measurements in the oxygen...

29

ARM - Publications: Science Team Meeting Documents  

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(ARM) Science Team Meeting Anthony Davis and Alexander Marshak have spearheaded a book proposal to Springer-Verlag on 3D radiative transfer in cloud layers and cloudy...

30

ARM - Publications: Science Team Meeting Documents  

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Y., Hampton University; Morcrette, J.-J., European Centre for Medium-Range Weather Forecasting Ninth Atmospheric Radiation Measurement (ARM) Science Team Meeting Data over the...

31

ARM - Publications: Science Team Meeting Documents  

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Measurement (ARM) Science Team Meeting Black carbon (BC), the predominant source of solar absorption in atmospheric aerosol, can be present therein as pure BC particles distinct...

32

ARM - Publications: Science Team Meeting Documents  

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Calculation of Forcing by Carbonaceous Aerosols Penner, J.E., Zhang, S., and Chuang, C., University of Michigan Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting...

33

ARM - Publications: Science Team Meeting Documents  

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A WWW-Staged Prototype ARM Database Utility Mace, G.G. and Hudach, D., University of Utah Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting Counting from when...

34

ARM - 2006 Science Team Meeting Presentations  

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Presentations Presentations 2006 Meeting 2006 Meeting Home Proceedings Sorted by Author Proceedings Sorted by Title Pictures Posters Presentations Meeting Archives ARM Science Team Meeting Proceedings Past Science Team Meetings 2006 Science Team Meeting Presentations Monday, March 27, 2006 ARM Orientation for New and Current PIs: Overview and History Warren Wiscombe (PDF, 6 MB) ARM Orientation for New and Current PIs: Infrastructure Overview 2006 Jimmy Voyles (PDF, 4MB) ARM Orientation for New and Current PIs: An Incomplete Introduction to ACRF Instrumentation Jim Liljegren (PDF, 4MB) ARM Orientation for New and Current PIs: ARM Data Quality Office - Real-Time Assessment of ARM Data Randy Peppler (PDF, 12MB) ARM Orientation for New and Current PIs: Getting Data from the ARM Archive

35

ARM - 2006 Science Team Meeting Pictures  

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Pictures Pictures 2006 Meeting 2006 Meeting Home Proceedings Sorted by Author Proceedings Sorted by Title Pictures Posters Presentations Meeting Archives ARM Science Team Meeting Proceedings Past Science Team Meetings 2006 Science Team Meeting Pictures Photos ARM Chief Scientist Warren Wiscombe presents "The ARM Chief Scientist Report" during Tuesday morning's plenary session. The Instantaneous Radiative Flux (IRF) Working Group report is presented at Tuesday morning's plenary session. Dr. David Thomassen, Acting Associate Director of DOE's Office of Biological and Environmental Research, attended this year's ARM Science Team Meeting. Meeting attendees listen at the morning plenary session. Rick Petty engages in a discussion after the plenary session. The ARM Science Team meeting allows scientists to collaborate and share their data and research.

36

ARM - Selected Science Team Proposals - FY 1995  

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5 5 Science Research Themes Research Highlights Journal Articles Collaborations Atmospheric System Research (ASR) ARM Science Team Meetings User Meetings Annual Meetings of the Atmospheric System Research (ASR) Science Team and Fall Working Groups Accomplishments Read about the 20 years of accomplishments (PDF, 696KB) from the ARM Program and user facility. Performance Metrics ASR Metrics 2009 2008 2007 2006 Selected Science Team Proposals - FY 1995 Dr. R. Nelson Byrne, SAIC: "Evolution of a New GCM-Capable Stochastic Cloud/Radiation Parameterization Using ARM Data - Phase II" Dr. Steven J. Ghan, Pacific Northwest National Laboratory: "Parameterization of Convective Cloud Coverage in GCMs" Dr. George Golitsyn, Russian Academy of Sciences, Institute of

37

ARM - Publications: Science Team Meeting Documents  

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8 Science Team Meeting 8 Science Team Meeting 1998 Proceedings Proceedings Sorted by Title Proceedings Sorted by Author Science Team Meeting Proceedings Cover image Proceedings of the Eighth Atmospheric Radiation Measurement (ARM) Science Team Meeting ARM-CONF-1998, March 1998 Tucson, Arizona For proper viewing, many of these proceedings should be viewed with Adobe Acrobat Reader. Download the latest version from the Adobe Reader website. View session papers by Author or Title. * Poster abstract only; an extended abstract was not provided by the author(s). History and Status of the ARM Program - March 1998 Session Papers A Cloud Climatology of the ARM CART Site S.M. Lazarus, S.K. Krueger, and G.G. Mace A Combination of the Separation of Variable and the T-Matrix Method for Computing Optical Properties of Spheroidal Particles*

38

ARM - Publications: Science Team Meeting Documents  

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

R.H.(a), and Papakyriakou, T.N.(b), University of Miami, RSMAS (a), University of Manitoba, CEOS (b) Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting As...

39

ARM - Publications: Science Team Meeting Documents  

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

Instrumentation for the AMR-UAV Payload McCoy, R.F., Tooman, T.T., and Bolton, W.B., Sandia National Laboratories Thirteenth Atmospheric Radiation Measurement (ARM) Science Team...

40

ARM - Publications: Science Team Meeting Documents  

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

0 Science Team Meeting 0 Science Team Meeting 2000 Proceedings Proceedings Sorted by Title Proceedings Sorted by Author Science Team Meeting Proceedings Cover image Proceedings of the Tenth Atmospheric Radiation Measurement (ARM) Science Team Meeting ARM-CONF-2000, March 2000 San Antonio, Texas For proper viewing, many of these proceedings should be viewed with Adobe Acrobat Reader. Download the latest version from the Adobe Reader website. View session papers by Author or Title. * Poster abstract only; an extended abstract was not provided by the author(s). Poster abstracts are not available online for this year. However, if you would like to request a copy of a specific poster abstract, please contact the Web Administrator. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A Abshire, J.B.

Note: This page contains sample records for the topic "arm science team" 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

ARM - Publications: Science Team Meeting Documents  

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

7 Science Team Meeting 7 Science Team Meeting 1997 Proceedings Proceedings Sorted by Title Proceedings Sorted by Author Science Team Meeting Proceedings Cover image Proceedings of the Seventh Atmospheric Radiation Measurement (ARM) Science Team Meeting ARM-CONF-1997, March 1997 San Antonio, Texas For proper viewing, many of these proceedings should be viewed with Adobe Acrobat Reader. Download the latest version from the Adobe Reader website. View session papers by Author or Title. Poster abstracts are not available online for this year. However, if you would like to request a copy of a specific poster abstract, please contact the Web Administrator. A Comparison of Integrated Water Vapor Sensors: WVIOP-96 J.C. Liljegren, E.R. Westwater, and Y. Han A Comparison of Observed Clear-Sky Surface Irradiance with

42

ARM - Publications: Science Team Meeting Documents  

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

3 Science Team Meeting 3 Science Team Meeting 1992 Proceedings Proceedings Sorted by Title Proceedings Sorted by Author Science Team Meeting Proceedings Proceedings of the Third Atmospheric Radiation Measurement (ARM) Science Team Meeting CONF-9303112, March 1-4,1993 Norman, Oklahoma For proper viewing, many of these proceedings should be viewed with Adobe Acrobat Reader. Download the latest version from the Adobe Reader website. View session papers by Author or Title. History and Status of the ARM Program - March 1993 History and Status of the Atmospheric Radiation Measurement Program - March 1993 P. Lunn, T. Cress, and G. Stokes Clear Skies A Study of Longwave Radiaiton Codes for Climate Studies: Validation with Observations and Tests in General Circulation Models - an Update R.G. Ellingson and F. Baer

43

ARM - Publications: Science Team Meeting Documents  

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

1 Science Team Meeting 1 Science Team Meeting 2001 Proceedings Proceedings Sorted by Title Proceedings Sorted by Author Science Team Meeting Proceedings Cover image Proceedings of the Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting ARM-CONF-2001, March 2001 Atlanta, Georgia For proper viewing, many of these proceedings should be viewed with Adobe Acrobat Reader. Download the latest version from the Adobe Reader website. View session papers by Author or Title. * Poster abstract only; an extended abstract was not provided by the author(s). A 3-Year Climatology of Cloud and Radiative Properties Derived from GOES-8 Data Over the Southern Great Plains M.M. Khaiyer, A.D. Rapp, D.R. Doelling, M.L. Nordeen, W.L. Smith, Jr., and P. Minnis A 4-Year Study of the RASS Temperature Bias

44

ARM - Publications: Science Team Meeting Documents  

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

7 Science Team Meeting 7 Science Team Meeting 1997 Proceedings Proceedings Sorted by Title Proceedings Sorted by Author Science Team Meeting Proceedings Cover image Proceedings of the Seventh Atmospheric Radiation Measurement (ARM) Science Team Meeting ARM-CONF-1997, March 1997 San Antonio, Texas For proper viewing, many of these proceedings should be viewed with Adobe Acrobat Reader. Download the latest version from the Adobe Reader website. View session papers by Author or Title. Poster abstracts are not available online for this year. However, if you would like to request a copy of a specific poster abstract, please contact the Web Administrator. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A Acharya, P. Spectral Resolution Effects on Solar Irradiance Calculations Ackerman, S.A.

45

ARM - Publications: Science Team Meeting Documents  

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

3 Science Team Meeting 3 Science Team Meeting 2003 Proceedings Proceedings Sorted by Title Proceedings Sorted by Author Science Team Meeting Proceedings Cover image Proceedings of the Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting ARM-CONF-2003, April 2003 Broomsfield, Colorado For proper viewing, extended abstracts should be viewed with Adobe Acrobat Reader. Download the latest version from the Adobe Reader website. View session papers by Author or Title. * Poster abstract only; an extended abstract was not provided by the author(s). A 20-year Data Set of Downwelling Longwave Flux at the Arctic Surface from TOVS Satellite Data Francis, J.A., Schweiger, A., and Key, J. A Comparison of Aerosol Scattering Parameters Obtained by Ground-Based Remote Sensing and In-situ Profile Flights*

46

ARM - Publications: Science Team Meeting Documents  

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

5 Science Team Meeting 5 Science Team Meeting 1995 Proceedings Proceedings Sorted by Title Proceedings Sorted by Author Science Team Meeting Proceedings Proceedings of the Fifth Atmospheric Radiation Measurement (ARM) Science Team Meeting ARM-CONF-1995, March 1995 San Diego, California For proper viewing, many of these proceedings should be viewed with Adobe Acrobat Reader. Download the latest version from the Adobe Reader website. View session papers by Author or Title. * Poster abstract only; an extended abstract was not provided by the author(s). A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A Ackerman, T.P. A Boundary-Layer Cloud Study Using Southern Great Plains Cloud and Radiation Testbed (CART) Data A Comparison of Radiometric Fluxes Influenced by Parameterized Cirrus Clouds with Observed Fluxes at the Southern Great Plains (SGP) Cloud

47

ARM - 2009 Science Team Meeting Presentations  

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

Presentations Presentations 2009 Meeting 2009 Meeting Home Proceedings Sorted by Author Proceedings Sorted by Title Pictures Posters Presentations Meeting Archives ARM Science Team Meeting Proceedings Past Science Team Meetings 2009 Science Team Meeting Presentations Monday, March 30, 2009 ARM Orientation for New and Current PIs Chief Scientist's Perspective (PDF, 3,362K) Warren Wiscombe ARM Instruments (PDF, 1,828K) Jimmy Voyles Infrastructure (PDF, 607K) Jim Mather How to Get Data (PDF, 9,307) Raymond McCord Working Group Sessions Radiative Properties Working Group 2009 Breakout Session Agenda (PDF, 36K) Dave Turner Radiative Constraints in Tropical Upper Troposphere and Lower Stratosphere (PDF, 281K) Qiang Fu Ground-Based Microwave Cloud Tomography Experiment (PDF, 597K) Dong Huang

48

ARM - Publications: Science Team Meeting Documents  

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

6 Science Team Meeting 6 Science Team Meeting 1996 Proceedings Proceedings Sorted by Title Proceedings Sorted by Author Science Team Meeting Proceedings Proceedings of the Sixth Atmospheric Radiation Measurement (ARM) Science Team Meeting DOE CONF-9603149, March 1996 San Antonio, Texas For proper viewing, many of these proceedings should be viewed with Adobe Acrobat Reader. Download the latest version from the Adobe Reader website. View session papers by Author or Title. Poster abstracts are not available online for this year. However, if you would like to request a copy of a specific poster abstract, please contact the Web Administrator. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A Ackerman, T.P. A Comparison Between Clear Sky Shortwave Flux Calculations and Observations During ARESE

49

ARM - Publications: Science Team Meeting Documents  

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

2 Science Team Meeting 2 Science Team Meeting 1992 Proceedings Proceedings Sorted by Title Proceedings Sorted by Author Science Team Meeting Proceedings Proceedings of the Second Atmospheric Radiation Measurement (ARM) Science Team Meeting DOE CONF-9110336, October 26-30, 1992 Denver, Colorado For proper viewing, many of these proceedings should be viewed with Adobe Acrobat Reader. Download the latest version from the Adobe Reader website. View session papers by Author or Title. * Poster abstract only; an extended abstract was not provided by the author(s). A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A Ackerman, T. An Integrated Cloud Observation and Modeling Investigation in Support of the Atmospheric Radiation Measurement Program Tropical Western Pacific Project: Status Albrecht, B.

50

ARM - Publications: Science Team Meeting Documents  

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

4 Science Team Meeting 4 Science Team Meeting 1994 Proceedings Proceedings Sorted by Title Proceedings Sorted by Author Science Team Meeting Proceedings Proceedings of the Fourth Atmospheric Radiation Measurement (ARM) Science Team Meeting DOE CONF-940277, March 1994 Charleston, South Carolina For proper viewing, many of these proceedings should be viewed with Adobe Acrobat Reader. Download the latest version from the Adobe Reader website. View session papers by Author or Title. * Poster abstract only; an extended abstract was not provided by the author(s). A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A Abreu, L.W. MODTRAN3: Suitability as a Flux-Divergence Code Acharya, P. MODTRAN3: Suitability as a Flux-Divergence Code Ackerman, S.A. Atmospheric Emitted Radiance Interferometer Data Analysis Methods

51

ARM - Publications: Science Team Meeting Documents  

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

2 Science Team Meeting 2 Science Team Meeting 1992 Proceedings Proceedings Sorted by Title Proceedings Sorted by Author Science Team Meeting Proceedings Proceedings of the Second Atmospheric Radiation Measurement (ARM) Science Team Meeting DOE CONF-9110336, October 26-30, 1992 Denver, Colorado For proper viewing, many of these proceedings should be viewed with Adobe Acrobat Reader. Download the latest version from the Adobe Reader website. View session papers by Author or Title. Technical Sessions A Field Evaluation of NOAA Remote Sensor Measurements of Wind, Temperature, and Moisture B.E. Martner A Stochastic Formulation of Radiant Transfer in Clouds and Radiative Properties of Non-Uniform Clouds G.L. Stephens and P.D. Gabriel A Study of Longwave Radiation Codes for Climate Studies: Validation

52

ARM - Publications: Science Team Meeting Documents  

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ARM In The Classroom: Developing an Operational Forecasting Site for the ARM In The Classroom: Developing an Operational Forecasting Site for the NSA Harrington, J. Y.(a) and Olsson, P. Q.(b), The Pennsylvania State University (a), The University of Alaska Anchorage (b) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting During the fall 2002 semester, the Department of Meteorology's Computer Applications in Meteorology course took on the project of developing an operational forecasting site for the ARM North Slope of Alaska and the Alaska Region. The course was designed around team-driven forecast products similar to what the students will find in the job environment. During the fall semester, the students were provided with a data feed from Alaska consisting of various forecast fields for the ETA model Alaska grid. The

53

ARM - Publications: Science Team Meeting Documents  

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

Meeting Meeting 1999 Proceedings Proceedings Sorted by Title Proceedings Sorted by Author Science Team Meeting Proceedings Cover image Proceedings of the Ninth Atmospheric Radiation Measurement (ARM) Science Team Meeting ARM-CONF-1999, March 1999 San Antonio, Texas For proper viewing, many of these proceedings should be viewed with Adobe Acrobat Reader. Download the latest version from the Adobe Reader website. View session papers by Author or Title. * Poster abstract only; an extended abstract was not provided by the author(s). A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A Abshire, J.B. Development of a Compact Lidar to Profile Water Vapor in the Lower Troposphere Ackerman, T.P. A 25-Month Database of Stratus Cloud Properties Generated from Ground-Based Measurements at the ARM SGP Site

54

ARM - Publications: Science Team Meeting Documents  

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Comparisons of a Cloud Resolving Model and ARM Data Comparisons of a Cloud Resolving Model and ARM Data Posselt, D., Mecikalski, J., Tanamachi, R., Feltz, W.F., Turner, D.D., Tobin, D., Knuteson, R.O., and Revercomb, H.E., University of Wisconsin - Madison Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting CIMSS/SSEC at the University of Wisconsin is currently running version 3.5 of the PSU/NCAR MM5 once per day at a resolution of 4 km over the ARM CART site domain. Simulations are performed using a sophisticated cloud-resolving microphysics scheme (Reisner 1998) and a radiative parameterization based on RRTM (Mlawer 1997). With selection of appropriate case studies, comparisons of the model output to ARM data can be used to evaluate the model's ability to reproduce boundary-layer thermal and

55

ARM - Publications: Science Team Meeting Documents  

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

Improved Retrieval Of Cloud Liquid Water Path For ARM Microwave Improved Retrieval Of Cloud Liquid Water Path For ARM Microwave Radiometers Liljegren, J.C., Ames Laboratory Eighth Atmospheric Radiation Measurement (ARM) Science Team Meeting The Atmospheric Radiation Measurement (ARM) Program has deployed dual-frequency microwave water radiometers (MWRs) at its Cloud and Radiation Testbed (CART) sites in the U. S. Southern Great Plains (SGP), the Tropical Western Pacific (TWP), and the North Slope of Alaska/Adjacent Arctic Ocean (NSA/AAO). Although the integrated water vapor amount provided by these instruments has enjoyed increasing application, the primary purpose of these instruments has been to provide measurements of the integrated liquid water path in clouds. The liquid water path measurements have been widely used by ARM investigators to test cloud life cycle

56

ARM - Publications: Science Team Meeting Documents  

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Cloud and Radiative Properties Derived Over the ARM NSA Domain From AVHRR Cloud and Radiative Properties Derived Over the ARM NSA Domain From AVHRR Data Heck, P.W., Nguyen, L., Smith, W. L., Jr., Ayers, J.K., Doelling, D.R., and Spangenberg, D.A., Analytical Services and Materials, Inc.; Minnis, P., and Young, D.F., National Aeronautics and Space Administration-Langley Research Center Ninth Atmospheric Radiation Measurement (ARM) Science Team Meeting The Atmospheric Radiation Measurement (ARM) Program's polar sites on the North Slope of Alaska (NSA) measure time series of various atmospheric, cloud and radiative properties over a few selected areas. Satellite data are needed to provide measurements of similar properties between the sites and to estimate the radiation budget at the top of the atmosphere. Over the other ARM sites in the central United States and the Pacific, geostationary

57

ARM - Publications: Science Team Meeting Documents  

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Evaluation of Terra Aerosol and Water Vapor Measurements Using ARM SGP Data Evaluation of Terra Aerosol and Water Vapor Measurements Using ARM SGP Data Ferrare, R.A.(a), Brasseur, L.H.(b), Clayton, M.B.(b), Turner, D.D.(c), Remer, L.(d), and Gao, B.C.(e), NASA Langley (a), SAIC (b), Pacific Northwest National Laboratory (c), NASA Goddard (d), Naval Research Laboratory (e) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting Measurements from the Department of Energy Atmospheric Radiation Measurement (ARM) Southern Great Plains (SGP) site are used to evaluate atmospheric measurements derived from NASA's Moderate-Resolution Imaging Spectroradiometer (MODIS) and Multiangle Imaging Spectroradiometer (MISR) sensors on board the Terra satellite. MODIS and MISR AOT retrievals are evaluated using ARM SGP Cimel Sun photometer and MultiFilter Rotating

58

ARM - Publications: Science Team Meeting Documents  

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Evaluation of Simulated Clouds in the Community Atmospheric Model (CAM2): Evaluation of Simulated Clouds in the Community Atmospheric Model (CAM2): Over the Globe and at the ARM Site Zhang, M.H.(a) and Lin, W.Y.(a), Stony Brook University Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting We first compare seasonal climatology of the global distribution of ISCCP-type clouds in the NCAR CAM2 with observations from ISCCP. Model deficiencies in simulated clouds are highlighted. Model capability of simulating the observed response of different cloud types to ENSO is also discussed. We then use ARM cloud measurements at the ARM SGP to compare with the CAM cloud statistics at the same site. It is shown that several model deficiencies in the global cloud distribution are also present at the ARM site. Relevance of these model deficiencies to the interpretation of

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Characterizing and Filling Temporal and Spatial Gaps in Time-Aggregated ARM Characterizing and Filling Temporal and Spatial Gaps in Time-Aggregated ARM Measurements for Use in Carbon Models Hargrove, W.W.(a), Brandt, C.C.(a), Jager, H.I.(a), Hanan, N.(b), and McCord, R.A.(a), Oak Ridge National Laboratory (ORNL)(a), Natural Resource Ecology Laboratory (NREL)(b) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting Data gaps limit the use of ARM data as input for simulation models. Because the ARM program records actual measurements, circumstances unavoidably arise when instrument and storage failures create gaps in the temporal stream of measurements. Most temporal gaps are short in duration and affect only one or a few related parameters. However, some rare failures, such as wide-area power outages or ice storms, occasionally affect many measurement

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Three-Dimensional Radiative Transfer Computations to Complement the ARM Three-Dimensional Radiative Transfer Computations to Complement the ARM Broadband Heating Rate Profile (BBHRP) Value Added Product (VAP) OHirok, W.(a), Gautier, C.(a), and Miller, M.A.(b), University of California, Santa Barbara (a), Brookhaven National Laboratory (b) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting A core programmatic goal of ARM is to understand how cloud variability is associated with radiative flux variability. A major effort among the ARM working groups is now underway to produce the Broadband Heating Rate Profile (BBHRP) Value Added Product (VAP). The heating rate profiles are derived from Rapid Radiative Transfer Models (RRTMs) that use best estimates of cloud characteristics, gaseous profiles, aerosols and surface

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61

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Physical Retrieval of PWV and CLW with MonoRTM Using ARM MWR Data Physical Retrieval of PWV and CLW with MonoRTM Using ARM MWR Data Clough, S.A.(a), Cady-Pereira, K.(a), Boukabara, S.(a), and Liljegren, J.C.(b), Atmospheric and Environmental Research, Inc. (a), Argonne National Laboratory (b) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting The newly developed radiative transfer model, MonoRTM, has been utilized as the forward model in a physical retrieval method to obtain Precipitable Water Vapor (PWV) and Cloud Liquid Water (CLW) using ARM MWR data. The dependence of the forward model on water vapor and oxygen has been carefully analyzed in the context of the ARM dataset covering a three-year period from 1996 to 1998. A detailed error analysis for the forward model brightness temperatures at 23.8 GHz and 31.4 GHz has been has been

62

ARM - Publications: Science Team Meeting Documents  

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Initial Measurements from the Compact Millimeter-Wave Radar Initial Measurements from the Compact Millimeter-Wave Radar Roman-Nieves, J.(a), Sekelsky, S.M.(a), Tooman, T.T.(b), and Bolton, W.B.(b), University of Massachusetts at Amherst (a), Sandia National Laboratories (b) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting The University of Massachusetts at Amherst has developed a solid state compact 95 GHz millimeter-wave radar (CMR) for the ARM Unmanned Aerospace Vehicle (UAV) program. CMR has recently flown in ARM-UAV sponsored engineering flights and a cirrus science mission flying aboard the NASA Proteus aircraft. This poster presents the final CMR hardware configuration and results from ground-based and airborne engineering measurements. In addition we show airborne measurements form from the ARM-UAV 2002 Cirrus

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ARM - Publications: Science Team Meeting Documents  

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ARM External Data: Recent Developments and Future Plans ARM External Data: Recent Developments and Future Plans Wagener, R., Gregory, L., Ma, L.L., and Cialella, A., Brookhaven National Laboratory Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting This poster lists new datastreams collected and processed by the ARM External Data Center since the last update in 1999 (MOLTS, TOMS, 30 min OK Mesonet, CSPHOT, TWP AVHRR, ECMWF, RUC, TAO Buoy, IAP). We describe briefly the software tools employed in converting these data to netCDF files, because data-users might find them helpful in dealing with the raw files themselves (GrADS, IDL, Perl). The priorities for future data acquisitions and ingests are set by consensus of the Science Working Groups. The current high priority new collections include: Suominet GPS data, Darwin Radar and

64

ARM - Publications: Science Team Meeting Documents  

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The ARM Blue/Green Period: 3-Channel Color Composites of GOES-8 Data The ARM Blue/Green Period: 3-Channel Color Composites of GOES-8 Data Wagener, R., and Gregory, L., Brookhaven National Laboratory, ARM External Data Center Konidaris, N., Carnegie Mellon University; Minnett, P.J., University of Miami, Rosenstiel School of Marine and Atmospheric Sciences Ninth Atmospheric Radiation Measurement (ARM) Science Team Meeting Despite the title and the general appearance of the resulting images, this is not an attempt to emulate art nor an expression of anybody's mood. It is simply an attempt to condense as much information as possible about a day's worth of Geostationary Operational Environmental Satellite (GOES) data onto a single web page. A 24-bit red, green, blue (RGB) color composite is derived by assigning the reflectivity in the GOES-8 visible channel to red,

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ARM - Publications: Science Team Meeting Documents  

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Meeting Meeting 2002 Proceedings Proceedings Sorted by Title Proceedings Sorted by Author Science Team Meeting Proceedings Cover image Proceedings of the Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting ARM-CONF-2002, April 2002 St. Petersburg, Florida For proper viewing, extended abstracts should be viewed with Adobe Acrobat Reader. Download the latest version from the Adobe Reader website. View session papers by Author or Title. * Poster abstract only; an extended abstract was not provided by the author(s). A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A Ackerman, S.A. Cloud Phase Determination in the Arctic Using AERI Data ERBE OLR and Cloud Type by Split Window* Ackerman, T.P. A Climatology of Shortwave Cloud Radiative Forcing Using Ground-Based Broadband Radiometric Time-Series*

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ARM - Publications: Science Team Meeting Documents  

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Meeting Meeting 2003 Proceedings Proceedings Sorted by Title Proceedings Sorted by Author Science Team Meeting Proceedings Cover image Proceedings of the Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting ARM-CONF-2003, April 2003 Broomsfield, Colorado For proper viewing, extended abstracts should be viewed with Adobe Acrobat Reader. Download the latest version from the Adobe Reader website. View session papers by Author or Title. * Poster abstract only; an extended abstract was not provided by the author(s). A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A Abdou, W.A. Intercomparison of MISR Aerosol Retrievals with Sunphotometer and MODIS Results* Ackerman, T.P. Comparison of Observed and Modelled Liquid Water Path for Stratus and Stratocumulus Clouds at the SGP*

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The Use of the ARM WSI to Estimate the Atmospheric Optical Depth at Night The Use of the ARM WSI to Estimate the Atmospheric Optical Depth at Night Musat, I.C. and Ellingson, R.G., University of Maryland Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting The shortwave extinction by atmospheric constituents can be studied during the night, with the light of stars as a radiation source, using the ARM Whole Sky Imager (WSI). The digital images obtained with the WSI are processed to infer the star radiance at the TOA and the broadband atmospheric extinction coefficient. Subsequently, the broadband extinction is calculated from an atmosphere model, and the goodness of fit of the model with observations is assessed taking into account the known profiles of temperature, pressure, columnar mixing ratios of the gases, diverse

68

ARM - Publications: Science Team Meeting Documents  

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Comparison of Aerosol Properties Within and Above the Atmospheric Boundary Comparison of Aerosol Properties Within and Above the Atmospheric Boundary Layer at the ARM SGP Site Delle Monache, L.(a), Perry, K.D.(a), and Cederwall, R.T.(b), San Jose State University (a), Lawrence Livermore National Laboratory (b) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting The objective of this work is to determine under what conditions, if any, measurements of aerosol properties made at the surface at the ARM SGP Central Facility are representative of aerosol properties within the column of air above the surface. This is important in assessing the value of data collected at the ARM Aerosol Observation System (AOS) for developing and diagnosing cloud and radiation parameterizations involving aerosol properties within and above the atmospheric boundary layer (ABL). The study

69

ARM - Publications: Science Team Meeting Documents  

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Sub-Grid-Scale Isentropic Transports on McRAS Evaluations Sub-Grid-Scale Isentropic Transports on McRAS Evaluations Using ARM-CART SCM Datasets Sud, Y.C., Walker, G.K., and Tao, W.-K., Climate and Radiation Branch, Laboratory for Atmospheres, NASA/Goddard Space Flight Center Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting Influence of Sub-grid-Scale Isentropic Transports on McRAS: Evaluation using ARM-CART SCM Datasets. Y. C. Sud, G. K. Walker and W.-K. Tao In GCM-physics evaluations with the currently available ARM-CART SCM datasets, McRAS produced very similar character of near surface errors of simulated temperature and humidity containing typically warm and moist biases near the surface and cold and dry biases aloft. We argued it must have a common cause presumably rooted in the model physics. Lack of vertical adjustment

70

ARM - Publications: Science Team Meeting Documents  

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Comparison of Stratus Cloud Optical Depths Retrieved from Surface and GOES Comparison of Stratus Cloud Optical Depths Retrieved from Surface and GOES Measurements over the SGP ARM Central Facility Dong, X., and Smith, W.L. Jr., Analytical Services and Materials, Inc.; Minnis, P., NASA Langley Research Center Eighth Atmospheric Radiation Measurement (ARM) Science Team Meeting For reliable application of satellite datasets in cloud process and single column models, it is important to have a reasonable estimate of the errors in the observed cloud properties. When properly used, ground-based instruments can provide a cloud truth dataset for estimating errors in the satellite products. Data taken during the spring 1994 ARM Intensive Observation Period (IOP), ARM Enhanced Shortwave Experiment (ARESE), and SUbsonic Aircraft Contrail and Cloud Effects Special Study (SUCCESS) are

71

ARM - Publications: Science Team Meeting Documents  

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GPS Measured Water Vapor Variability at the ARM SGP CF GPS Measured Water Vapor Variability at the ARM SGP CF Braun, J. (a), Rocken, C. (a), and Schmid, B. (b), UCAR (a), BAER (b) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting Ground based Global Positioning System (GPS) stations can measure precipitable water vapor (PWV) and slant water vapor (SWV). SWV is the integrated amount of water vapor along the slant path from the GPS transmitter to the station. The ARM program has sponsored the University Corporation for Atmospheric Research (UCAR) to install and operate a network of single frequency GPS receivers at the Southern Great Plains (SGP) Central Facility (CF). Fourteen stations were installed in 1999, and an additional nine stations in 2000. The entire network covers approximately 40 square kilometers roughly centered around the SGP CF. This

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ARM - Publications: Science Team Meeting Documents  

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An Overview of Water Vapor IOP (WVIOP) 2000 and ARM/FIRE Water Vapor An Overview of Water Vapor IOP (WVIOP) 2000 and ARM/FIRE Water Vapor EXperiment (AFWEX) Tobin, D., Revercomb, H., and Turner, D.D., University of Wisconsin-Madison Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting WVIOP 2000 and AFWEX, two field experiments with focus on the accuracy of ARM water vapor measurements, have recently been conducted. WVIOP 2000, the third in a series of WVIOPs which have studied the accuracy of lower tropospheric water vapor measurements, ran from 18 September to 8 October 2000 and consisted of ground based operations primarily out of the SGP central facility. AFWEX was an interagency experiment with the primary goal of assessing the accuracy of upper level (~8-12 km) water vapor measurements. It was conducted from 27 November to 15 December 2000 and

73

ARM - Publications: Science Team Meeting Documents  

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ARM Radiosonde Humidity Measurements and Proposed Corrections ARM Radiosonde Humidity Measurements and Proposed Corrections Based On AWEX Radiosonde Intercomparisons Miloshevich, L.M.(a), Lesht, B.M.(b), and Voemel, H.(c), National Center for Atmospheric Research (a), Argonne National Laboratory (b), NOAA/CMDL (c) Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting ARM radiosonde relative humidity (RH) measurements are widely used in numerical modeling, remote sensor validation, and radiative transfer calculations, yet their accuracy as a function of temperature and RH has not been adequately quantified. During the AIRS Water vapor EXperiment (AWEX) at the SGP site in November 2003, 34 launches of multiple radiosondes on the same balloon were conducted, including 12 soundings from the University of Colorado's Cryogenic Frostpoint Hygrometer (CFH). The

74

ARM - Publications: Science Team Meeting Documents  

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Using ARM Measurements to Evaluate and Improve the Turbulent Boundary-Layer Using ARM Measurements to Evaluate and Improve the Turbulent Boundary-Layer Parameterization in the CCM Zhang, M.H. (a) and Yu, R.C. (a), State University of New York(a) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting Three-Dimensional advective tendencies at the Atmospheric Radiation Measurement (ARM) Program Southern Great Plains (SGP) site, together with diurnal variation of the clear-sky boundary layer atmosphere temperature and moisture, are used to study the down-gradient and "non-local" turbulent transport of heat and moisture in the atmospheric boundary layer. The observational results are then used to evaluate the boundary layer parameterization in the National Center for Atmospheric Research (NCAR) CCM3. It is found that the down-gradient turbulent transport in the CCM3 is

75

ARM - Publications: Science Team Meeting Documents  

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Fair - Weather Cumuli Climatology at the TWP ARM Site Fair - Weather Cumuli Climatology at the TWP ARM Site Kollias, P. and Albrecht B.A., University of Miami Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting Fair-weather cumuli are fundamental in regulating the vertical structure of water vapor and entropy in the lowest 2 km of the Earths atmosphere over vast areas of the oceans. Over two years of data from the mm-wavelength cloud radar, at the Nauru (TWP-ARM) site, are analyzed and a statistical description of the field of fair weather cumulus is inferred. Frequency diagrams of cloud thickness, fractional coverage, updraft-downdraft magnitudes and cloud reflectivity are calculated for four different classes of fair weather cumuli. Seasonal patterns are identified and their relationship to the thermodynamic structure of the boundary layer (wet-dry

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ARM - Publications: Science Team Meeting Documents  

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Diurnal Cycle of Cloud Microphysical Properties from GOES Over the ARM Diurnal Cycle of Cloud Microphysical Properties from GOES Over the ARM Southern Great Plains Minnis, P., and Young, D.F., National Aeronautics and Space Administration-Langley Research Center; Smith, W.L., Jr., and Heck, P.W., Analytical Services and Materials, Inc. Ninth Atmospheric Radiation Measurement (ARM) Science Team Meeting Cloud coverage, height and optical depth have been derived from the Geostationary Operational Environmental Satellite (GOES) data taken over the Atmospheric Radiation Measurement (ARM) Program's Southern Great Plains (SGP) domain since 1994. While these parameters provide a valuable basis for understanding the interaction of clouds with the radiation budget, they do not provide a complete characterization of the cloud field. Phase

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ARM - Publications: Science Team Meeting Documents  

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Comparison of MM5 Forecast Shortwave Radiation with ARM SGP Data Comparison of MM5 Forecast Shortwave Radiation with ARM SGP Data Armstrong, M.A. and Ellingson, R.G., University of Maryland Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting The performance of the Pennsylvania State University-National Center for Atmospheric Research Mesoscale Model 5 (MM5), in particular the shortwave downwelling (SW) flux calculations, is examined in this paper. Selected quantities output from the MM5 were compared with ARM SGP data gathered during the SCM intensive observation period (IOP) from June 18 to July 18, 1997. MM5 was run 29 times with a forecast length of 24 hours. The data were saved and then compared to radiosonde and pyranometer data. SW flux calculated from the MM5 deviated severely from that observed at the SGP

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ARM - Publications: Science Team Meeting Documents  

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Comparison of ARM Cloud Property Observations with CRM Simulations Comparison of ARM Cloud Property Observations with CRM Simulations Xu, K.-M. (a), Cederwall, R.T. (b), Xie, S.C. (b), and Yio, J.J. (b), NASA Langley Research Center (a), Lawrence Livermore National Laboratory (b) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting The cloud property observations are compared with cloud-resolving model simulated cloud properties in this study, using the Summer 1997 Intensive Observation Period (IOP) data of the ARM program. Midlatitude continental cumulus convection are simulated by seven 2-D and two 3-D cloud resolving models (CRMs), driven by observed large-scale advective temperature and moisture tendencies, surface turbulence fluxes, and radiative heating profiles during three subperiods of the Summer 1997 IOP. Each subperiod

79

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Aerosol Indirect Effect: Evidence from the ARM SGP and NSA Sites Aerosol Indirect Effect: Evidence from the ARM SGP and NSA Sites Penner, J.E.(a), Chen, Y.(a), and Dong, X.(b), University of Michigan (a), University of North Dakota (b) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting The ARM SGP site and the NSA site provide a unique opportunity to examine the effects of aerosols on cloud optical properties because the aerosol concnetrations at each site span the range between polluted and clean conditions. Here, we examine whether the effect of aerosols on clouds can adequately explain the observed relationship between the liquid water path observed at each site and the cloud optical depth required to determine the observed surface flux. Aerosol number concentration at the SGP site was determined from the observed CN number concentration as well as the

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An Overview of ARM Satellite Cloud and Radiation Budget Datasets An Overview of ARM Satellite Cloud and Radiation Budget Datasets Minnis, P.(a), Nguyen, L.(a), Smith Jr., W.L.(a), Doelling, D.R.(b), Heck, P.W.(c), Khaiyer, M.M.(b), Palikonda, R.(b), Young, D.F.(a), Spangenberg, D.A.(b), Chakrapani, V.(b), Walter, B.J.(b), and Nowicki, G.D.(b), NASA Langley Research Center (a), Analytical Services and Materials, Inc. (b), CIMSS/University of Wisconsin-Madison (c) Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting The derivation of cloud properties from satellite data has been greatly enhanced by the availability of new multispectral satellite imagers, the validation power of ARM instruments and IOPs, and increases in computer processing speeds. Likewise, the recent availability of broadband radiation

Note: This page contains sample records for the topic "arm science team" 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

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Cloud Height Statistics Derived from ARM Millimeter Cloud Radar Cloud Height Statistics Derived from ARM Millimeter Cloud Radar Kato, S. (a), Clothiaux, E.E. (b), and Xu, K.-M. (c), Hampton University (a), Pennsylvania State University (b), NASA Langley Research Center(c) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting The probability of occurrence of the cloud top height for a given altitude and relation to the geometrical cloud thickness are derived from radar reflectivity factor taken by a millimeter cloud radar operated at ARM Oklahoma site. Statistics derived using July 1997 data show that the cloud top is likely to occur at 12 km and clouds extend to the lower troposphere. Statistics derived using January 1998 data show that single layer boundary layer clouds are dominant. There is another cloud top peak, although less

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ARM - Publications: Science Team Meeting Documents  

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LASE Characterization of Water Vapor, Aerosol, and Cloud Distributions Over LASE Characterization of Water Vapor, Aerosol, and Cloud Distributions Over the ARM Southern Great Plains Central Facility During AFWEX Ismail, S. (a), Ferrare, R.A. (a), Browell, E.V. (a), Kooi, S.A. (b), Brasseur L.H. (b), Clayton, M.B. (b), Brackett, V. (b), Goldsmith, J.E.M. (c), Whiteman, D.N. (d), and Barrick, J. (a), NASA Langley Research Center (a), SAIC Inc., Hampton, Virginia (b), Sandia National Laboratories (c), NASA Goddard Space Flight Center (d) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting NASA's Lidar Atmospheric Sensing Experiment (LASE) system was operated during the ARM/FIRE Water Vapor Experiment (AFWEX) to characterize the upper tropospheric water vapor field over the ARM Center Facility (CF) as part of the third Water Vapor Intensive Observation Period (WVIOP3). LASE

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Direct Aerosol Forcing Calculated at the ARM Southern Great Plains Site Direct Aerosol Forcing Calculated at the ARM Southern Great Plains Site Ackerman, T.P., Flynn, D.M., and Long, C.N., Pacific Northwest National Laboratory Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting The continuous measurements of direct and diffuse solar radiation, water vapor column amount, and aerosol optical depth provided at the ARM SGP site permit us to calculate directly the actual magnitude of the direct aerosol forcing. Our methodology employs the clear sky detection algorithm of Long and Ackerman (2000) to identify cloudless periods. We then fit the downward solar flux at the surface during these periods with an empirical function, which provides us with a continuous mathematical representation of the surface flux under aerosol conditions. The flux under completely clear

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ARM - Publications: Science Team Meeting Documents  

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Infrared Cloud Imager (ICI) Measurements of Cloud Statistics During the Infrared Cloud Imager (ICI) Measurements of Cloud Statistics During the 2003 Cloudiness Intercomparison Campaign Gregory, L., Wagener, R., Ma, L.L., and Cialella, A., Brookhaven National Laboratory Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting The process of creating ARM data-streams from external data sources is described from identification of scientific need as determined by the science working groups to implementation and documentation, which involves ARM's task management tools: Engineering Change Request/Order, Baseline Change Request, Data Object Design/Birth of a Data Stream, eXternal Data Stream documentation. Pitfalls and typical delays are illustrated with recently completed data-stream ingests. Some procedural changes are

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ARM - Publications: Science Team Meeting Documents  

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Evaluation of Terra MODIS Aerosol and Water Vapor Measurements Using ARM Evaluation of Terra MODIS Aerosol and Water Vapor Measurements Using ARM SGP Data Ferrare, R.A. (a), Brasseur, L.H. (b), Turner, D.D. (c,d), Tooman, T.P. (e), Remer, L. (f), and Gao, B-C. (g), NASA Langley Research Center (a), Science Applications International Corporation/NASA/LaRC (b), Pacific Northwest National Laboratory (c), University of Wisconsin-Madison (d), Sandia National Laboratories (e), NASA Goddard Space Flight Center (f), Naval Research Laboratory (g) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting NASA's Moderate-Resolution Imaging Spectroradiometer (MODIS) sensor on the Earth Observing System (EOS) Terra satellite platform has been measuring aerosol and water vapor parameters since February 2000. The MODIS aerosol

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ARM - Publications: Science Team Meeting Documents  

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A Satellite-Based Assessment of Upper Tropospheric Water Vapor Measurements A Satellite-Based Assessment of Upper Tropospheric Water Vapor Measurements During AFWEX Soden, B.J.(a), Ferrare, R.A.(b), Goldsmith, J.E.M.(c), Smith, W.L.(d), Tobin, D.(e), Turner, D.D.(f), and Whiteman, D.N.(g), NOAA/GFDL (a), NASA/LaRC (b), Sandia National Laboratories (c), NASA/LaRC (d), UW/SSEC (e), Pacific Northwest National Laboratory (f), NASA/GSFC (g) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting Accurate measuremetns of upper tropospheric water vapor are critical both for understanding the flow of radiation and formation of clouds, and for the detection and attribution of climate change. In fall of 2000 ARM conducted the ARM-FIRE Water Vapor Experiment (AFWEX) to evaluate the accuracy of upper tropospheric water vapor measurements. The experiment

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ARM - Publications: Science Team Meeting Documents  

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An Assessment of Upper Tropospheric Humidity Measurements at the ARM An Assessment of Upper Tropospheric Humidity Measurements at the ARM SGP/CART Site Soden, B.J. (a), Turner, D.D. (b), and Goldsmith, J.E.M. (c), NOAA/GFDL (a), Pacific Northwest National Laboratory (b), Sandia National Laboratories (c) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting Upper tropospheric water vapor plays a key role in regulating the flow of radiation through clear skies and the formation and dissipation of clouds. Unfortunately, due to the difficulty of accurately measuring this quantity, it remains a key uncertainty in GCM predictions of climate change. Much of the uncertainty surrounding upper tropospheric water vapor reflects an incomplete understanding of the processes which regulate its distribution and variations. This, in turn, reflects the lack of suitable observations

88

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From Crops to Boundary Layer and Back Down Again: the ARM Carbon Project in From Crops to Boundary Layer and Back Down Again: the ARM Carbon Project in the Southern Great Plains Torn, M.S.(a), Berry, J.(b), Riley, W.J.(a), Fischer, M.L.(a), Billesbach, B.(c), Helliker, B.(b), and Giles, L.(b), Lawrence Berkeley National Laboratory (a), Carnegie Institution of Washington (b), University of Nebraska (c) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting One of the challenges in carbon cycle research is the vast range of scale that must be traversed by measurements and models. Our understanding of carbon cycle processes is being built from studies of enzymes, organisms and plot-scale studies of ecosystems, while our ultimate objective is to understand the mass and isotope balance of earth’s atmosphere. Spanning

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Comparison of Spectral and Broadband Measurements of Surface Flux with Comparison of Spectral and Broadband Measurements of Surface Flux with Model Calculations on Clear Days at the ARM SGP Site Arking, A. (a), Liu, F. (a), Harrison, L. C. (b), Pilewskie, P. (c), and Chou, M.-D. (d), Johns Hopkins University (a), State University of New York, Albany (b), NASA Ames Research Center (c), NASA Goddard Space Flight Center (d) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting Observations of spectral and broadband solar irradiance at the ARM/SGP site have been compared with line-by-line model calculations. The spectral measurements were made with the SUNY Albany Rotating Shadowband Spectroradiometer (RSS) and the NASA Ames Solar Spectral Flux Radiometer (SSFR). The broadband measurements were made with the Baseline Solar

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ARM - Publications: Science Team Meeting Documents  

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Development and Comparison of Ground- and Satellite-based Retrievals of Development and Comparison of Ground- and Satellite-based Retrievals of Cirrus Cloud Physical Properties d'Entremont, R.P.(a) and Mitchell, D.L.(b), Atmospheric and Environmental Research, Inc. (a), Desert Research Institute (b) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting This project is designed to (1) develop new ground- and space-based retrieval methods for cirrus cloud ice water path (IWP), effective size (Deff), and visible extinction optical thickness (OT) using thermal infrared wavelength bands from 3.7 to 13 um, and (2) to compare these retrievals with others obtained by ARM investigators during various ARM IOPs. During year 1 of this project research focused primarily on the enhancing of satellite- and ground-based thermal infrared retrievals of

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NREL Pyrheliometer Comparisons - 2002 NREL Pyrheliometer Comparisons - 2002 Reda, I. and Stoffel, T.L., National Renewable Energy Laboratory Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting All broadband shortwave radiometers used by the ARM Program are calibrated with absolute cavity radiometers traceable to the World Radiometric Reference (WRR). The WRR was developed and is maintained by the World Radiation Center under the auspices of the World Meteorological Organization. Each fall, the National Renewable Energy Laboratory (NREL) hosts annual comparisons of absolute cavity radiometers at the Solar Radiation Research Laboratory in Golden, Colorado. Since 1995, NREL has maintained the Transfer Standard Group (TSG) consisting of five radiometers belonging to NREL and the ARM Program. Our poster summarizes the results of

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ARM - Publications: Science Team Meeting Documents  

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CAGEX Version 3: Tightening Shortwave Fluxes and Measurements of Surface CAGEX Version 3: Tightening Shortwave Fluxes and Measurements of Surface Spectral Characteristics Alberta, T.L., Analytical Services and Materials, Inc.; Charlock, T.P., National Aeronautics and Space Administration-Langley Research Center Ninth Atmospheric Radiation Measurement (ARM) Science Team Meeting Version 3 of the CAGEX (Clouds and Earth's Radiant Energy System [CERES]/Atmospheric Radiation Measurement [ARM]/Global Energy and Water Experiment [GEWEX]) is introduced. As with Version 2 (10/95) and Version 1 (4/94), Version 3 provides input data sufficient for broadband radiative transfer calculations; fluxes computed with those inputs and the Fu-Liou code as modified by Hu, Rose and Kratz; and measurements for validation and diagnostics. Along with the usual ARM data sets (Solar and Infrared

93

ARM - Publications: Science Team Meeting Documents  

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Using ARM GOES-8 Cloud and TOA Flux Properties to Estimate Surface Using ARM GOES-8 Cloud and TOA Flux Properties to Estimate Surface Radiation Budget Parameters Stackhouse, P.W., Jr. (a), Gupta, S.K. (b), Cox, S.J. (b), Minnis, P. (a), Smith, W.L., Jr. (b), and Khaiyer, M.M. (b), NASA Langley Research Center (a) Analytical Services and Materials, Inc. (b) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting The Global Energy and Water Cycle Experiment (GEWEX) Surface Radiation Budget Project (SRB) uses top-of-atmosphere (TOA) radiance measurements and cloud property retrievals to estimate surface fluxes on a global basis. Normally, GEWEX SRB algorithms rely on TOA radiances and cloud information derived from International Satellite Cloud Climatology Project (ISCCP) data. Here, we show first results of using SW and LW algorithms featured in

94

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Irradiance Using Remotely Sensed Cloud Properties From Irradiance Using Remotely Sensed Cloud Properties From ARM's SGP Site Barker, H.W., Atmospheric Environment Service of Canada; Li, Z., Canada Centre for Remote Sensing; Clothiaux, E.E., and Ackerman, T.P., The Pennsylvania State University; Kato, S., National Aeronautics and Space Administration-Langley Research Center Ninth Atmospheric Radiation Measurement (ARM) Science Team Meeting Time series of profiles of cloud water content and droplet effective radii have been inferred from data obtained by a 35-GHz radar and a Microwave Radiometer (MWR) at the Atmospheric Radiation Measurement (ARM) Program's Southern Great Plains (SGP) site. These profiles initialize a Monte Carlo algorithm that predicts time series of broadband surface solar irradiance, which in turn are compared with coeval measurements. Special attention is

95

ARM - Publications: Science Team Meeting Documents  

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Sizes, Fractional Coverage, and Radar Doppler Moments Profiles of Sizes, Fractional Coverage, and Radar Doppler Moments Profiles of Fair-Weather Cumulus Clouds at the TWP ARM Site Kollias, P., Albrecht B.A., and Dow B.J., University of Miami Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting Fair-weather cumuli are fundamental in regulating the vertical structure of water vapor and entropy in the lowest 2 km of the Earth's atmosphere over vast areas of the oceans. Using data from the mm-wavelength cloud radar, the micro-pulse lidar and ceilometer at the Nauru (TWP-ARM) site, a statistical description of the field of fair weather cumulus is inferred. Frequency diagrams of cloud thickness, fractional coverage, updraft-downdraft magnitudes and cloud reflectivity are calculated. The relationship of the statistical behavior of the cumulus field to the

96

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Water Vapor Intensive Operating Periods: General Results, Status and Plans Water Vapor Intensive Operating Periods: General Results, Status and Plans Revercomb, H.E., Tobin, D.C., Knuteson, R.O., and Feltz, W.F., University of Wisconsin-Madison; Turner, D.D., Pacific Northwest National Laboratory Ninth Atmospheric Radiation Measurement (ARM) Science Team Meeting Accurate measurements of atmospheric water vapor are very important for climate research and monitoring. Unexpectedly large uncertainties of sonde water vapor observations implied by Atmospheric Radiation Measurement (ARM) Program's radiation measurements led to special Water Vapor Intensive Observation Periods (IOPs) conducted in 1996 and 1997 at the Southern Great Plains (SGP) central facility. The goal was to use the complement of ARM advanced instrumentation to better quantify the problem and to find ways of

97

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Interactions of Cumulus Convection and the Boundary Layer Over the Southern Interactions of Cumulus Convection and the Boundary Layer Over the Southern Great Plains Krueger, S.K. (a), Luo, Y. (a), Lazarus, S.M. (a), and Xu, K.-M. (b), University of Utah (a), NASA Langley Research Center (b) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting We are using observations and cloud-resolving model (CRM) simulations to better understand the interaction between deep cumulus convection and the boundary layer over the southern Great Plains of the United States. The observations are from a 29-day ARM SCM IOP that took place at the ARM SGP site during June and July 1997. The cumulus effects in the boundary layer are due to rain evaporation and fluxes due to cumulus updrafts and downdrafts. These effects can substantially modify the boundary layer in

98

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The Second ARM Diffuse Horizontal Irradiance Comparison Fall 2003 The Second ARM Diffuse Horizontal Irradiance Comparison Fall 2003 Michalsky, J.J.(a), Dolce, R.(b), Dutton, E.G.(c), Long, C.N.(d), Jeffries, W.Q.(e), McArthur, L.J.B.(f), Philipona, R.(g), Reda, I.(h), and Stoffel, T.L.(h), State University of New York at Albany (a), Kipp & Zonen, Inc. (b), Climate Monitoring and Diagnostics Laboratory, NOAA (c), Pacific Northwest National Laboratory (d), Yankee Environmental Systems, Inc. (e), Meteorological Service of Canada (f), World Radiation Center (g), National Renewable Energy Laboratory (h) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting The first diffuse horizontal irradiance comparison in the Fall 2001 revealed a consistency near the 2 W/m2 level among more than half of the pyranometers that participated. In planning for this second comparison the

99

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Boundary Layer Structure and Fair-Weather Cumulus Characteristics at the Boundary Layer Structure and Fair-Weather Cumulus Characteristics at the TWP ARM Site - Comparisons with Other Tropical and Subtropical Sites Albrecht, B. and Kollias, P., University of Miami Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting Fair-weather cumuli are fundamental in regulating the vertical structure of water vapor and entropy in the lowest 2 km of the Earths atmosphere over vast areas of the oceans. Boundary layer structures and cloud characteristics observed at Nauru (ARM TWP) during suppressed convective conditions are compared with those observed at other tropical and subtropical sites. Over three years of data from the mm-wavelength cloud radar and ceilometer observations at the Nauru site are analyzed and a statistical description of the field of fair weather cumulus is inferred.

100

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Towards Parameterization of Frontal Mesoscale Circulations and Cloudiness Towards Parameterization of Frontal Mesoscale Circulations and Cloudiness in GCMs Based on ARM Observations Norris, J.R.(a), Weaver, C.P.(b), Gordon, N.D.(c), and Klein, S.A.(d), Scripps Institution of Oceanography (a), Rutgers University (b), Scripps Institution of Oceanography (c), GFDL/NOAA (d) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting Cloudiness associated with extratropical cyclones is currently poorly represented in GCMs due to incorrect and insufficient representation of subgrid-scale processes. Since this can lead to erroneous cloud-climate feedbacks it is necessary to develop an understanding of the relationship between mesoscale cloud variability and large-scale synoptic forcing that will result in improved parameterization. Observations from the ARM

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101

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I Method I Method Potter, G.L.(a), Boyle, J.S.(a), Cederwall, R.T.(a), Fiorino, M.(a), Hnilo, J.J.(a), Phillips, T.J.(a), and Williamson, D.(b), Lawrence Livermore National Laboratory (a), National Center for Atmospheric Research (b) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting We present a methodology to diagnose GCM errors by using NWP analyses to initialize a climate model. The analysis is used as input in conjunction with ARM data to study the initial model drift (6-36 hours) from the observations. Simply put, a climate model is used in a weather forecast mode to see how quickly it drifts from the observed weather and detailed observations provided by the ARM program. This approach can be used to improve parameterizations responsible for models errors on longer time

102

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International Pyrgeometer and Absolute Sky-scanning Radiometer Comparison International Pyrgeometer and Absolute Sky-scanning Radiometer Comparison at the NSA ARM site Barrow Stamnes, K. (a), Dutton, E.G. (b), Marty, Ch. (c), Michalsky, J.J. (d), Philipona, R. (e), Stoffel, T. (f), Storvold, R. (c), and Zak, B.D. (g), Stevens Institute of Technology, New Jersey (a), NOAA, Climate Monitoring and Diagnostics Laboratory (b), University of Alaska Fairbanks (c), State University of New York at Albany (d), World Radiation Center, Davos, Switzerland (e), National Renewable Energy Lab, Boulder (f), Sandia National Laboratories, Albuquerque (g) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting The first International Prgeometer and Absolute Sky-scanning Radiometer Comparison (IPASRC I), which was held in fall 1999 at the ARM SGP site in

103

ARM - Publications: Science Team Meeting Documents  

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An Improved Technique for Producing MPL Backscatter Profiles Properly An Improved Technique for Producing MPL Backscatter Profiles Properly Characterized at All Ranges Flynn, C.J. and Powell, D.M., Pacific Northwest National Laboratory Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting An important part of ARM's mission is the quantitative study of the effect of clouds and aerosol on radiative transfer and the energy budget. Micropulse Lidar (MPL) are an integral component of the ARM Program's measurement strategy with one deployed at each of the four major sites (SGP, TWP1, TWP2, and NSA). The MPL system is capable of producing vertical profiles of cloud and aerosol from ground level to the top of the atmosphere. However, the legitimacy of these profiles is sensitive to the calibration and system corrections of the individual MPL. In particular,

104

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Validation of CERES/MODIS Cloud Property Retrievals Using Ground-Based Validation of CERES/MODIS Cloud Property Retrievals Using Ground-Based Measurements Obtained at the DOE ARM SGP Site Dong, X.(a), Minnis, P.(b), Sun-Mack, S.(b), and Mace, G.G.(a), University of Utah (a), NASA Langley Research Center (b) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting Cloud macrophysical and microphysical properties derived from the NASA TERRA (EOS-AM) Moderate Resolution Spectroradiometer (MODIS) as part of the Clouds and the Earth's Radiant Energy System (CERES) project during November 2000-June 2001 are compared to simultaneous ground-based observations. The ground-based data taken by the Atmospheric Radiation Measurement (ARM) Program are used as "ground truth" data set in the validation of the CERES cloud products and to improve the CERES daytime and

105

ARM - Publications: Science Team Meeting Documents  

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Comparison of Daily Broadband Surface Albedos Measured at Six Extended Comparison of Daily Broadband Surface Albedos Measured at Six Extended Facilities in the ARM Southern Great Plains Cloud and Radiation Testbed Hamm, K.G., University of Oklahoma Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting An analysis of time series of daily hemispherical broadband surface albedo for 1998-1999 from six ARM Extended Facilities has been performed. The results show that the mean annual albedo differs by as much as 30% among the six sites. The annual range of daily albedos also varies among the sites. For example, albedos measured at the tallgrass prairie near Pawhuska, OK show a range of daily albedo between 0.15 and 0.20 for 1998, while daily albedos measured at a grazed pasture near Cordell, OK for the same time period have a range between 0.17 and 0.24 (or 40% higher than at

106

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Comparison of Boundary Layer Cloud Properties using Surface and GOES Comparison of Boundary Layer Cloud Properties using Surface and GOES Measurements at the ARM SGP Site Dong, X. (a), Minnis, P. (b), Smith, W.L., Jr. (b), and Mace, G.G. (a), University of Utah (a), NASA Langley Research Center (b) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting Boundary layer cloud microphysical and radiative properties derived from GOES data during March 2000 cloud IOP at ARM SGP site are compared with simultaneous surface-based observations. The cloud-droplet effective radius, optical depth, and top-of-atmoshpere (TOA) albedo are retrieved from a 2-stream radiative transfer model in conjunction with ground-based measurements of cloud radar, laser ceilometer, microwave and solar radiometers. The satellite results are retrieved from GOES visible and

107

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Initial Cloud Properties Derived from GMS Over the Tropical Western Pacific Initial Cloud Properties Derived from GMS Over the Tropical Western Pacific Doelling, D.R., Ho, S.-P., Smith, W.L., Jr., Analytical Services and Materials, Inc.; Minnis, P., National Aeronautics and Space Administration-Langley Research Center Ninth Atmospheric Radiation Measurement (ARM) Science Team Meeting Satellite data are needed to provide measurements of the earth-atmosphere shortwave (SW) albedo, outgoing longwave radiation (OLR), and cloud and surface radiative properties for the Atmospheric Radiation Measurement (ARM) Program's Tropical Western Pacific (TWP) domain. Geostationary Meteorological Satellite (GMS) data have been archived since November 1996 and provide the basis for monitoring these essential parameters over the ARM TWP. This paper describes the initial efforts and results of developing

108

ARM - Publications: Science Team Meeting Documents  

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Shortwave and Longwave Flux and Cooling Rate Profiles for the ARM Central Shortwave and Longwave Flux and Cooling Rate Profiles for the ARM Central Facility Clough, S.A. (a), Delamere, J.S. (a), Mlawer, E.J. (a), Cederwall, R.T. (b), Revercomb, H. (c), Tobin, D. (c), Turner, D.D. (c), Knuteson, R.O. (c), Michalsky, J.J. (d), Kiedron, P.W. (d), Ellingson, R.G. (e), Krueger, S.K. (f), Mace, G.G. (f), Shippert, T. (g), and Zhang, M.H.(h), Atmospheric and Environmental Research, Inc. (a), Lawrence Livermore National Laboratory (b), University of Wisconsin-Madison (c), State University of New York, Albany (d), University of Maryland (e), University of Utah (f), Pacific Northwest National Laboratory (g), State University of New York, Stony Brook (h) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting Accurate representations of the cooling rate profile, the surface flux and

109

ARM - Publications: Science Team Meeting Documents  

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an Improved Convective Triggering Mechanism in the NCAR CAM2 an Improved Convective Triggering Mechanism in the NCAR CAM2 under the CCPP-ARM Parameterization Testbed (CAPT) Framework Xie, S.C.(a), Cederwall, R.T.(a), Potter, G.L.(a), Boyle, J.S.(a), Yio, J.J.(a), Zhang, M.H.(b), and Lin, W.Y.(b), Lawrence Livermore National Laboratory (a), State University of New York at Stony Brook (b) Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting In this study, we implement an improved convective triggering mechanism, which was developed by Xie and Zhang [2000] based on the ARM observations and Single-Column Model (SCM) tests, in the NCAR Community Atmosphere Model (CAM2) in order to reduce the problem that the model produces excessive warm season daytime precipitation over land. This problem is closely

110

ARM - Publications: Science Team Meeting Documents  

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Change of Atmospheric Boundary Layer Thermal Regime Induced by Aerosol as Change of Atmospheric Boundary Layer Thermal Regime Induced by Aerosol as Measured by MTP-5 Koldaev, A.V.(a), Kadygrov, E.N.(a), Khaikine, M.N.(a), Kuznetsova, I.N.(b), and Golitsyn, G.S.(c), Central Aerological Observatory (a), Hydrometeorological Center (b), A.M.Obukhov Institute of Atmospheric Physics Russian Academy of Science (c) Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting Change in atmospheric boundary layer (ABL) radiation balance as caused by natural and anthropogenic reasons is an important topic of ARM Project. The influence of aerosol while its concentration was extremely high within a long period of time was studied experimentally. The case was observed in Moscow region with the transport of combustion products from peat and

111

ARM - Publications: Science Team Meeting Documents  

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Characterization and Calibration of the Commercial RSS Slated for Permanent Characterization and Calibration of the Commercial RSS Slated for Permanent Deployment at SGP Kiedron, P., Berndt, J., Yager, E., Harrison, L., and Michalsky, J., Atmospheric Sciences Research Center, SUNY at Albany, New York Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting The ARM program purchased a rotating shadowband spectroradiometer (RSS) that was manufactured by Yankee Environmental Systems, Inc. At ASRC the instrument went through initial acceptance tests and after corrections and modifications made by the manufacturer the instrument was characterized. The angular response, linearity, wavelength registration, out-of-band rejection, slit function, absolute spectral response and noise were measured. The purpose of instrument characterization is to provide the

112

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Infrared Interferometric Measurements of the Air-Sea Temperature Difference Infrared Interferometric Measurements of the Air-Sea Temperature Difference Minnett, P.J., Rosenstiel School of Marine and Atmospheric Science, University of Miami Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting Marine Atmosphere Emitted Radiance Interferometers (M-AERI) have been mounted on several research ships on cruises in the world?s oceans, several in the areas of the ARM TWP and NSA-AAO sites. Accurate measurements of the skin sea-surface temperature and near-surface air temperatures are derived from the infrared spectral measurements, which, unlike conventional measurements of air-sea temperature difference, have a common calibration. This removes the largest source of uncertainty in the measurement of air-sea temperature differences, and thereby a major uncertainty in

113

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The Solar Spectrum 360 to 1050 nm from Rotating Shadowband The Solar Spectrum 360 to 1050 nm from Rotating Shadowband Spectroradiometer (RSS) Measurements at the Southern Great Plains Site Harrison, L.C., Berndt, J.L., Kiedron, P.W., Michalsky, J.J., Min, Q., and Schlemmer, J., Atmospheric Sciences Research Center, State University of New York, Albany Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting Two years of Langley extrapolations made from the Southern Great Plains (SGP) site of the Atmospheric Radiation Measurement (ARM) Program using two very different RSS instruments and a NIST-derived irradiance scale show larger extraterrrestrial solar irradiances in the 400 to 600 nm domain by as much as 4.5% compared to the Labs and Neckels [1968] data. Our results are more congruent with Thuiller et al. [1998] in this domain, but do not

114

ARM - Publications: Science Team Meeting Documents  

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Availability and Status of MISR Geophysical Data Products Availability and Status of MISR Geophysical Data Products Diner, D.J. and the MISR Science Team, Jet Propulsion Laboratory, California Institute of Technology Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting The Multi-angle Imaging SpectroRadiometer (MISR) instrument aboard the Terra spacecraft has been collecting Earth imagery since February 2000. MISR contains nine cameras pointed at fixed along-track directions, and acquires images with view angles at the Earth’s surface ranging from 70.5º forward of nadir to 70.5º aftward, in four spectral bands. The MISR experiment routinely generates geophysical data products using new algorithms developed specifically to capitalize on MISR's observational strategy. Included among these products are aerosol optical depths and

115

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LASE Characterization of Water Vapor Over the ARM SGP During AFWEX LASE Characterization of Water Vapor Over the ARM SGP During AFWEX Ismail, S.(a), Ferrare, R.A.(a), Browell, E.V.(a), Kooi, S.A.(b), Brasseur, L.H.(b), Clayton, M.B.(b), Brackett, V.(b), Turner, D.D. (c), Goldsmith, J.E.M.(d), Whiteman, D.N.(e), Barrick, J.(a), Sachse, G.(a), Diskin, G.(a), Podolske, J.(f), Schmidlin, F.J.(g), and Bosenberg, J.(h), NASA Langley (a), SAIC (b), Pacific Northwest National Laboratory (c), Sandia National Laboratories (d), NASA Goddard (e), NASA Ames (f), NASA Wallops (g), Max Planck Institute (h) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting NASA's Lidar Atmospheric Sensing Experiment (LASE) system was operated during the ARM/FIRE Water Vapor Experiment (AFWEX) to characterize the upper tropospheric (UT) water vapor field over the ARM Center Facility (CF)

116

ARM - Publications: Science Team Meeting Documents  

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On the Detection and Analysis of Multilayered Clouds: Comparison of MODIS On the Detection and Analysis of Multilayered Clouds: Comparison of MODIS Analyses with ARM CART Site Cloud Products Baum, B.A.(a), Nasiri, S.L.(b), and Mace, G.G.(c), NASA Langley Research Center (a), University of Wisconsin-Madison (b), University of Utah (c) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting We will present new ideas regarding the detection and analysis of multilayered clouds in Moderate Resolution Imaging Spectroradiometer (MODIS) imagery. Over the past year, the MODIS cloud property retrieval effort has matured considerably as algorithms have been improved and the instrument performance has been characterized more accurately. Errors caused by noise, striping, and out-of-band response have been reduced. We have developed and tested different approaches for daytime and nighttime

117

ARM - Publications: Science Team Meeting Documents  

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Spatial Hetergeneity in Mid-Summer Fluxes of Carbon, Water and Energy in Spatial Hetergeneity in Mid-Summer Fluxes of Carbon, Water and Energy in Agriculutural Plots Near the SGP Central Facility Fischer, M.L.(a), Billesbach, D.(b), Berry, J.(c), Riley, W.R.(a), and Torn, M.S.(a), Lawrence Berkeley National Laboratory (a), University of Nebraska (b), Carnegie Institution of Washington (c) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting Patterns of land use and management are likely to dominate the spatial heterogeneity in cycles of energy, carbon, and water in ecosystems of the Southern Great Plains (SGP). We report recent progress on measuring and modeling spatial heterogeneity in land surface-atmosphere exchange for different crops in the footprint of a flux system mounted on the ARM SGP Central Facility 60 m tower. The first phase of our the "Portable Flux

118

ARM - Publications: Science Team Meeting Documents  

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Parameterizing the Radiative Properties of Midlatitude Clouds Parameterizing the Radiative Properties of Midlatitude Clouds Sassen, K. (a), Comstock, J.M. (b), and Wang, Z. (a), University of Utah (a), Pacific Northwest National Laboratory (b) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting A major goal of the ARM program is to obtain the requisite information needed to improve the treatment of the radiative effects of clouds in large-scale models that ultimately must be relied on to predict the impact of human-induced activities on global climate change. The clouds of the middle and upper troposphere are especially difficult to treat because of their variable optical properties, which range from optically thin in the visible, and graybody emitters in the infrared, to dense blackbody emitters. Approaches to obtain this information involve the development of

119

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The Surface Shortwave Radiation Budget in the ECMWF Forecast System The Surface Shortwave Radiation Budget in the ECMWF Forecast System Morcrette, J.-J., European Centre for Medium-Range Weather Forecasts, United Kingdom Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting The surface shortwave radiation (SSR) produced by the ECMWF forecast system since 1989 is studied with reference to the various versions of the shortwave radiation scheme. For the latest 6-spectral interval version, model SSR is compared with surface radiation measurements for recent periods, available as part of the Baseline Surface Radiation Network (BSRN), Surface Radiation Network (SURFRAD), and Atmospheric Radiation Measurement (ARM) programs. Comparisons on one-hour basis are emphasized to allow discrepancies to be more easily linked to differences between model

120

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Winter Surface Radiative Energy Exchange at NSA: Cloudy vs. Clear Sky Winter Surface Radiative Energy Exchange at NSA: Cloudy vs. Clear Sky Stramler, K.(a), Del Genio, A.D.(b), and Rossow, W.(b), Columbia University (a), NASA/GISS (b) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting ARM measurements at Point Barrow, Alaska show that atmospheric emission drives the winter variability of the surface radiative energy exchange, as the incursion of air masses of differing properties alternately warm and cool the snow surface and the snow-ground interface. The magnitude of the surface radiative energy exchange, however, appears to be in part dictated by the more slowly varying sub-surface temperatures. This is most evident when observing the inter-annual variability of clear-sky surface net longwave radiation at NSA; winter cloudy-sky surface net longwave radiation

Note: This page contains sample records for the topic "arm science team" 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

ARM - Publications: Science Team Meeting Documents  

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Preliminary Analysis of Horizontal Inhomogeneity for ARESE II Clouds Preliminary Analysis of Horizontal Inhomogeneity for ARESE II Clouds Marshak, A. (a), Wiscombe, W.J. (b), Davis, A.B. (c), and Pilewskie, P. (d), UMBC/JCET (a), NASA/GSFC (b), LANL (c), NASA/Ames (d) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting ARM Enhanced Shortwave Experiment (ARESE) II was conducted at the SGP site from February 21 through April 15, 2000. The identical set of radiometers simultaneously measured the broadband and narrowband fluxes, as well as spectral fluxes and radiances from the aircraft flying above clouds and on the ground. To escape sampling problems with only one aircraft flying a daisy pattern over the central facility, the whole experiment was focused on optically thick stratocumulus clouds. However, even heavy stratus clouds

122

ARM - Publications: Science Team Meeting Documents  

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Evaluation of Day-Night Continuity in Retrievals of Cloud Properties from Evaluation of Day-Night Continuity in Retrievals of Cloud Properties from GOES Heck, P.W.(a), Minnis, P.(b), Khaiyer, M.M.(a), Smith, Jr., W.L.(b), Young, D.F.(b), and Nguyen, L.(b), Analytical Services & Materials, Inc. (a), NASA Langley Research Center (b) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting Currently, multi-spectral algorithms are being used to retrieve microphysical and radiative cloud p roperties from Geostationary Operational Environmental Satellite (GOES) imagery in a near-real time over a domain that includes the ARM Southern Great Plains (SGP) site. The Visible-Infrared-Solar i nfrared-Split window Technique (VISST) and Solar infrared- Infrared-Split window Technique (SIST) a re applied to half-hourly GOES data. The VISST is utilized during daylight hours while

123

ARM - Publications: Science Team Meeting Documents  

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A Continuous Baseline Microphysical Retrieval (MICROBASE): Status of SGP A Continuous Baseline Microphysical Retrieval (MICROBASE): Status of SGP Version 1.2 and Prototype TWP Version Miller, M.A.(a), Johnson, K.L.(a), Jensen, M.P.(b), Mace, G.G.(c), Dong, X.(d), and Vogelmann, A.M.(a), Brookhaven National Laboratory (a), Columbia University (b), University of Utah (c), University of North Dakota (d) Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting The interaction of clouds with incoming and outgoing radiation streams produces discontinuous regions of heating and cooling within the atmospheric column. These regions can influence the atmospheric circulations at multiple scales, as well as modify the existing cloud structures. The Broadband Heating Rate Project (BBHRP) within ARM has the goal of producing instantaneous snapshots of the heating and cooling rate

124

ARM - Publications: Science Team Meeting Documents  

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Applications of the Aerosonde at NSA Applications of the Aerosonde at NSA Curry, J.A. and Holland, G.J., University of Colorado Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting The first ARM Aerosonde flights at Barrow in April 1999 were not successful owing to the aircraft's inability to fly under severe icing conditions. However, we were sufficiently encouraged by these initial flights to pursue further developments to make feasible Aerosonde flights in the Arctic. NSF has funded a major project to establish a long-term Aerosonde facility based in Barrow. Extensive research is underway on the topic of icing mitigation. A limited but successful mission was undertaken in Barrow during August 2000. In the coming year, flights are planned for April, August 2001. We hope to be able to fly the originally proposed

125

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Evaluating the NCEP Global Forecast Model Clouds Evaluating the NCEP Global Forecast Model Clouds Lazarus, S.M. (a), Krueger, S.K. (a), Jenkins, M.A. (a), and Pan, H.-L. (b), University of Utah (a), National Centers for Environmental Prediction (b) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting As part of a collaborative effort with the National Center for Environmental Prediction (NCEP), the University of Utah is now archiving (daily) column data from the NCEP Medium Range Forecast (MRF) model. Data are collected for 8 sites, 4 of which directly coincide with ARM facilities at Manus, Nauru, Barrow, and the Southern Great Plains (SGP) Central Facility (CF). The bevy of observational data at these locations offers a unique opportunity to evaluate model performance. Because cloud feedback

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Cloud Base Height Cloud Base Height Kassianov, E., Long, C., and Christy, J., Pacific Northwest National Laboratory Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting We have suggested a method for estimating Cloud Base Height (CBH) by using paired ground-based Total Sky Imagers (TSI) hemispherical observations (Kassianov and Long, 2003). Our results of the model-output inverse problem showed that, for broken clouds (single layer), moderately accurate CBH retrieval is possible. Both a TSI and a Hemispherical Sky Imager (HSI) were run simultaneously during the ARM Cloudiness Intercomparison IOP (Oklahoma, 2003). We use the data from these two instruments to evaluate the suggested method. We perform the CBH retrieval for a few fields of broken clouds (occurring at different altitudes) by using the suggested method. Then we

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Formation of Fair-Weather Cumuli Formation of Fair-Weather Cumuli Zhu, P. and Albrecht, B., University of Miami Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting This study includes two related parts. In the first part, The formation of fair-weather cumuli has been analyzed based on both a simple mixed layer model and the data collected from the Atmospheric Radiation Measurement (ARM) program at the Southern Great Plains (SGP) site. By analyzing the conditions for the formation of fair-weather cumuli, we illustrate how different processes, such as the surface heat fluxes, the entrainment process at the boundary layer top, the vertical thermodynamic structure above the boundary layer, and the large-scale subsidence, control the formation of clouds. The results of our analysis show that it is the highly

128

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Improved Surface Emissivities Derived from Multispectral Satellite Data Improved Surface Emissivities Derived from Multispectral Satellite Data Over the ARM SGP Smith, W.L., Jr., Minnis, P., and Young, D.F., NASA Langley Research Center Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting Surface emissivity is an important parameter for many remote sensing applications but is difficult to determine because it requires an accurate specification of the surface skin temperature. Because of this, laboratory estimates of the emissivity of pure surfaces are often relied on which generally do not adequately simulate the Earth's natural surfaces as seen from a satellite imager in space. A technique has been developed to derive surface emissivity from clear-sky, multispectral satellite data for three infrared channels (3.9 or 3.7, 10.8 and 12.0 um) common to many of today's

129

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Exploration of Statistical Angular Radiance Closure in Cloudy Skies Exploration of Statistical Angular Radiance Closure in Cloudy Skies Evans, K.F.(a) and Wiscombe, W.J.(b), University of Colorado (a), NASA/Goddard (b) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting Most ARM cloudy sky radiation closure experiments have been performed with broadband fluxes. However, it is difficult to understand the causes of the inevitable discrepencies between the modeled and observed broadband fluxes in those closure experiments because the fluxes are extensively integrated over angle and wavelength. For example, knowing that a particular comparison disagrees by 50 W/m^2 is not particularly helpful in discovering which aspects of cloud remote sensing, radiative transfer, or measurements might be in error. Angular radiance closure compares the measured and

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Improved Methods for Broadband Outdoor Radiometer Calibration (BORCAL) Improved Methods for Broadband Outdoor Radiometer Calibration (BORCAL) Wilcox, S.M., Andreas, A.M., Reda, I., and Myers, D.R., National Renewable Energy Laboratory Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting The ARM Program deploys approximately 100 radiometers to measure broadband solar radiation at stations in the North Slope of Alaska (NSA), Southern Great Plains (SGP), and Tropical Western Pacific (TWP) Cloud and Radiation Testbed (CART) sites. Two calibration events performed at the SGP Radiometer Calibration Facility (RCF) each year maintain radiometer calibration traceability to the World Radiometric Reference and assure reliable and uniform measurements at each CART site. Calibrations are performed using the Radiometer Calibration and Characterization (RCC)

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A Comparison of the TSI/WSI Cloud Fraction Estimates at the SGP A Comparison of the TSI/WSI Cloud Fraction Estimates at the SGP Slater, D.W.(a), Long, C.N.(a), and Tooman, T.P.(b), Pacific Northwest National Laboratory (a), Sandia National Laboratory (b) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting Beginning with the installation of the Total Sky Imager (TSI) at the ARM Southern Great Plains site in July, 2000, both the TSI and the Whole Sky Imager (WSI) have operated simultaneously in close proximity to one another. Both systems produce all-sky cloud fraction estimates as part of their primary products, though each uses distinctly different methods to arrive at these estimates. The purpose of this study is to provide a link between the large body of estimates produced by the WSI before the

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A Tale of Two Cirrus A Tale of Two Cirrus Poellot, M.R.(a), Mace, G.G.(b), and Arnott, W.P. (c), University of North Dakota (a), University of Utah (b), Desert Research Institute (c) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting On May 8, 1998, an orographically-forced cirrus layer overspread the DOE ARM Program's Southern Great Plains site and subsequently became mixed with anvil outflow from thunderstorms. These clouds were sampled in situ by the University of North Dakota Citation aircraft and remotely by an array of ground-based radar, lidar and radiometric instrumentation. The first of two aircraft flights sampled the orographic cirrus through a series of step climbs and spirals. During that time, the cloud was relatively uniform in depth and structure. Shortly after the start of the second flight, the

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Investigation of the Aerosol Indirect Effect at the Southern Great Plains Investigation of the Aerosol Indirect Effect at the Southern Great Plains Using Ground Based Remote Sensors and Modeling Feingold, G.(a), Lane, D.(b), and Min, Q.(c), NOAA/ETL (a), Rutgers University (b), ASRC, SUNY Albany (c) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting We are using ground-based remote sensors, supplemented by in situ measurements when available, to explore the aerosol indirect effect in non-precipitating, ice-free clouds. The study uses archived ARM data on sub-cloud aerosol extinction, cloud liquid water path, cloud optical depth, drop effective radius, and boundary layer dynamics to investigate the relationship between aerosol extinction and drop effective radius. Two approaches are being taken: the first is an empirical approach which

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Large Eddy Simulations of Fair-Weather Cumulus Case at SGP Site Large Eddy Simulations of Fair-Weather Cumulus Case at SGP Site Zhu, P. and Albrecht, B.A., University of Miami Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting A fair-weather cumulus (FWC) case observed on July 6, 1997 at the ARM SGP site is simulated using RAMS model. In this study, we performed a series of numerical experiments to study the basic physics underlying the FWC and the evolution of these clouds in response to the change of external forcings and conditions. The simulations indicate that the evolution of shallow cumuli is very sensitive to the initial vertical structure of moisture and the variation of the entrainment moisture fluxes. Based on the penetration theory, we are able to develop a cloud initiation parameterization using

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Results of the Atmospheric Aerosol Condensation Activity Studies Results of the Atmospheric Aerosol Condensation Activity Studies Isakov, A.A. and Golitsyn, G.S., A.M.Obukhov Institute of Atmospheric Physics Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting Some new results are presented. of investigations of optical and microphysical characteristics of the atmospheric surface layer aerosol by means of spectropolarimeter The daily measurements were carried out in February - April 2000 at the Zvenigorod Scientific Station of the Institute within the Institut's ARM measurements Program. The spectropolarimeter measured the spectral dependencies of the polarization components of direct scattering coefficient D at three angles j = 450,900,1350 in spectral region l= 0.4 -0.75 mcm. During the measurement period about 500 records

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Radiative Effects of Cloud Inhomogeneity and Geometric Association over the Radiative Effects of Cloud Inhomogeneity and Geometric Association over the Tropical Western Pacific Warm Pool Jensen, M.P.(a) and DelGenio, A.D.(b), Department of Applied Physics and Applied Mathematics, Columbia University, NASA GISS (a), NASA GISS (b) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting The radiative and microphysical characteristics for several precipitating anvil systems observed by the TRMM satellite over the Manus or Nauru Island ARM sites are modelled. Reflectivity data from the TRMM Precipitation radar and GMS satellite infrared radiometer measurements are used to parametrize the three-dimensional cloud microphysics of each precipitating cloud system. These parameterized cloud properties are used as input for a

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Mapping of Surface Reflectance over the Southern Great Plains Region from Mapping of Surface Reflectance over the Southern Great Plains Region from Multiple Satellites Trishchenko, A.P.(a), Li, Z. (a,b), and Park, W. (a), Canada Centre for Remote Sensing, Ottawa, Canada (a), Now at ESSIC, Department of Meteorology, College Park (b) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting The ground-based ARM observations are limited to a handful of locations sparsely distributed in the South Great Plains (SGP). Mapping of surface narrow and broadband albedos are necessary for modeling and remote sensing studies to better describe the spatial variability of surface boundary conditions. In this study, we present surface narrowband and broadband reflectance, as well as the normalized difference vegetation index over the

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On the Uncertainty of Inferring Absolute Cloud Fraction from Time Series of On the Uncertainty of Inferring Absolute Cloud Fraction from Time Series of Narrow Field of View Observations Ma, Y.-T.(a) and Ellingson, R. G.(b), University of Maryland at College Park (a), Florida State University (b) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting One way to parameterize longwave 3-D cloud effects is to relate the various cloud properties to a statistical cloud field parameter called the Probability of Clear Line of Sight (PCLS) and then to a simple integral parameter - the effective cloud fraction. In our ongoing study, we are trying to test various PCLS models with ARM cloud observations. Many of the cloud properties must be inferred from time series of zenith observations, whereas spatially averaged quantities are the ones desired. What are the

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The Influence of Clouds, Aerosols, and Water Vapor on the Discrepancy The Influence of Clouds, Aerosols, and Water Vapor on the Discrepancy Between Modeled and Observed Atmospheric Absorption Arking, A. Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting Daily mean estimates of atmospheric absorption of solar radiation at the ARM/SGP site are obtained for 36 days during the fall season in 1995 and 1997. They are based on broadband observations of surface flux and satellite estimates of TOA albedo. Mean absorption in the vertical column is 0.246 (expressed as a ratio with respect to the incident flux at TOA). For 13 of the days, which are entirely free of clouds, the mean absorption is 0.245. Although clouds have no systematic effect on absorption, they do have an effect---sometimes causing an increase and sometimes a decrease

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Cloud Property Retrieval Using Combined Ground-Based Remote Sensors Cloud Property Retrieval Using Combined Ground-Based Remote Sensors Wang, Z. and Sassen, K., University of Utah Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting The Atmospheric Radiation Measurements Program (ARM) is making measurements with diverse ground-based remote sensors. To provide more complete and accurate cloud information, it is necessary to combine diverse measurements because of the different capabilities of various sensors. In this study, a remote sensing cloud detection algorithm has been developed that can differentiate between various atmospheric targets such as ice and water clouds, virga, precipitation, and aerosol layers. Cloud type and macrophysical properties are identified by combining ground-based polarization lidar, millimeter wave radar, infrared radiometer, and dual

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The Radiative Properties of Uniform and Broken Stratus: An Observational The Radiative Properties of Uniform and Broken Stratus: An Observational and Modelling Study Utilizing the Independent Column Approximation for Solar Radiative Transfer Clothiaux, E.E., The Pennsylvania State University; Barker, H.W., Atmospheric Environment Service of Canada; Kato, S., Hampton University; Dong, X., Analytical Service and Materials, Inc. Ackerman, T.P., The Pennsylvania State University; Liljegren, J.C., Ames Laboratory Ninth Atmospheric Radiation Measurement (ARM) Science Team Meeting The Millimeter-Wave Cloud Radar (MMCR) has operated continuously at the Atmospheric Radiation Measurement (ARM) Program's Southern Great Plains (SGP) site since November 11, 1996. As yet, much of the early data has not been calibrated correctly and insect contamination in the boundary layer is

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High Latitude Cloud Microphysical Properties from FTIR Data High Latitude Cloud Microphysical Properties from FTIR Data Lubin, D., Scripps Institution of Oceanography Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting The ARM AERI instruments record downwelling radiance spectra with sufficient radiometric calibration to enable the retrieval of important cloud microphysical properties. This poster will describe how radiative transfer simulations that include cloud thermodynamic phase (liquid water, ice, mixed phase) can be utilized with Fourier Transform Infrared (FTIR) spectroradiometer data. The presence of the ice phase in cloud alters the slope of the brightness temperature spectrum between 800 - 1200 inverse centimeters, such that ice can often be detected. The AERI near infrared channel also may have potential for cloud phase as discrimination.

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A Compact Millimeter-Wave Radar for UAV Applications A Compact Millimeter-Wave Radar for UAV Applications Bambha, R., Carswell, J., and Swift, C., University of Massachusetts Ninth Atmospheric Radiation Measurement (ARM) Science Team Meeting Assembly of the Compact Millimeter-wave Radar (CMR) has been completed at the University of Massachusetts, and ground-based cloud measurements have been acquired. The CMR is a 95-GHz solid-state radar intended for airborne cloud measurements. Funding for the project was provided by the Atmospheric Radiation Measurement-Unmanned Aerospace Vehicle (ARM-UAV) program with the eventual goal of developing a radar capable of operating on the Altus UAV. Simultaneous measurements made by CMR and the Cloud Profiling Radar System (CPRS) have been made to evaluate CMR's performance. CPRS is a larger

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Evaluation of Upper Tropospheric Water Vapor in the NCAR Community Climate Evaluation of Upper Tropospheric Water Vapor in the NCAR Community Climate Model, CCM3, Using Modeled and Observed HIRS Radiances Iacono, M.J., Delamere, J.S., Mlawer, E.J., and Clough, S.A., Atmospheric and Environmental Research, Inc. Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting Upper tropospheric water vapor (UTWV) simulated by the National Center for Atmospheric Research Community Climate Model, CCM3, is evaluated by comparing modeled, clear sky, brightness temperatures to those observed from space by the High-resolution Infrared Radiation Sounder (HIRS). The climate model was modified to utilize a highly accurate longwave radiation model, RRTM, and a separate radiance module, both developed for the Atmospheric Radiation Measurement (ARM) Program. The radiance module

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3D Delta-Diffusion and IR Monte-Carlo Methods for Radiative Transfer 3D Delta-Diffusion and IR Monte-Carlo Methods for Radiative Transfer Applied to Inhomogeneous Cirrus over the ARM-SGP Site Chen, Y.(a), Liou, K.N.(a), Gu, Y.(a), Ou, S.C.(a), and Mace, G.G.(b), University of California, Los Angeles (a), University of Utah (b) Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting An efficient method based on a full multigrid approach has been developed to solve the 3D delta-diffusion radiative transfer equation, which utilizes four-term spherical harmonics expansion for the phase function and intensity. This method first solves the inhomogeneous partial differential equation on a number of coarse grids and subsequently performs interpolation to predivided fine grids to speed up the convergence of the solution, particularly useful for cloud radiation parameterization in

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Anomalous Radiative Absorption and Unbounded Cascade Models of Cloud Anomalous Radiative Absorption and Unbounded Cascade Models of Cloud Fields Schertzer, D., and Larchevêque, M., Université P.&M. Curie, Paris, France; Lovejoy, S., McGill University; Naud, C., Blackett Laboratory, Imperial College, London Ninth Atmospheric Radiation Measurement (ARM) Science Team Meeting One of the most achieving results of Atmospheric Radiation Measurement (ARM) Program could well have been the empirical finding of the anomalous radiative absorption of the atmosphere. We demonstrate that unbounded cascade models of cloud fields, rather than bounded cascade models, could give a theoretical and quantitative understanding of this phenomenon. Indeed, the former models keep contact with the physics and coherence of the turbulent cascades (velocity, temperature and liquid water content) and

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Analysis of the Aerosol-Cloud Interactions from Aircraft, Surface Analysis of the Aerosol-Cloud Interactions from Aircraft, Surface Measurements, and Cloud Parcel Model During the March 2000 IOP at the ARM SGP Site Delene, D.J.(a), Dong, X.(a), Chen, Y.(b), Poellot, M.(a), and Penner, J.E.(b), University of North Dakota (a), University of Michigan (b) Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting One of the largest uncertainties in estimating anthropogenic forcing of climate change and in predicting future climates is the relationship between atmospheric aerosols and cloud properties. Aerosols affect cloud optical properties, cloud water content and cloud lifetime. A higher aerosol number concentration generally results in the nucleation of more smaller cloud droplets, which increases cloud albedo and results in a

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Consistency of ARESE II Cloud Absorption Estimates and Sampling Issues Consistency of ARESE II Cloud Absorption Estimates and Sampling Issues Oreopoulos, L.(a), Marshak, A.(a), and Cahalan, R.F.(b), JCET – University of Maryland Baltimore County (a), NASA-GSFC (b) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting Data from three cloudy days (March 3, 21, 29, 2000) of the ARM Enhanced Shortwave Experiment II (ARESE II) were analyzed. Grand averages of broadband absorptance among three sets of instruments were compared. Values of fractional absorptance were ~0.20-0.22 for all three days with the exception of March 3 when two sets of instruments gave values smaller by ~ 0.03-0.04. The robustness of these values was investigated by looking into possible sampling problems mainly with the aid of 500 nm spectral fluxes.

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Cirrus Cloud Statistics from a Cloud-Resolving Model Simulation Compared to Cirrus Cloud Statistics from a Cloud-Resolving Model Simulation Compared to Cloud Radar Observations Krueger, S.K. (a), Luo, Y. (a), Mace, G.G. (a), and Xu, K.-M. (b), University of Utah (a), NASA Langley Research Center (b) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting Mace, Clothiaux, and Ackerman (2000; MCA) determined the properties of cirrus clouds derived from one year (December 1996 to November 1997) of MMCR data collected at the SGP ARM site in Oklahoma. They also used additional measurements to retrieve the bulk microphysical properties of thin cirrus cloud layers. We sampled CRM results in a way that allows direct comparison to MCA's observations and retrievals of cirrus cloud properties. This allows evaluation, in a statistical sense, of the CRM's

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Correction of Sonde Upper Tropospheric Humidity Through Radiance Correction of Sonde Upper Tropospheric Humidity Through Radiance Assimilation Soden, B.J.(a), Turner, D.D.(b), and Lesht, B.M.(c), NOAA/GFDL (a), Pacific Northwest Natinal Laboratory (b), Argonne National Laboratory (c) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting The difficulty of measuring upper tropospheric water vapor from radiosonde instrumentation is widely recognized. Recent results from several ARM IOPs and the AFWEX field campaign have demonstrated a substantial dry bias in sonde measurements. Existing corrections for these measurements can improve the moisture concentrations at lower levels, but offer little improvement in the upper troposphere. Unfortunately, accurate measurements of upper tropospheric water vapor are necessary to constrain the transfer of

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Properties Over the North Slope of Alaska: A Comparison of Properties Over the North Slope of Alaska: A Comparison of Ground-Based and Space-Based Retrievals Storvold, R.(a), Marty, C.(a), Xiong, X.(b), Stamnes, K.H.(c), and Zak, B.D.(d), University of Alaska Fairbanks (a), QSS group Inc. (b), Stevens Institute of Technology (c), Sandia National Laboratories (d) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting In the Arctic there is a large seasonal variability in cloud cover, cloud base height, and cloud liquid water content. Cloud properties above the ARM/NSA CART site in Barrow are retrieved using a suite of different instruments and retrieval techniques. Daily and monthly averages of the cloud properties are derived for a full annual cycle using data from LIDAR, Whole Sky Imager, Cloud Radar, Micro Wave Radiometer, and Broadband

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Impact of an Improved Longwave Radiation Model, RRTM, on the Energy Budget Impact of an Improved Longwave Radiation Model, RRTM, on the Energy Budget and Thermodynamic Properties of the NCAR Climate Model, CCM3 Iacono, M.J., Mlawer, E.J., and Clough, S.A., Atmospheric and Environmental Research, Inc. Ninth Atmospheric Radiation Measurement (ARM) Science Team Meeting The effect of introducing a new longwave radiation parameterization, Rapid Radiative Transfer Model (RRTM), on the energy budget and thermodynamic properties of Version 3 of the National Center for Atmospheric Research (NCAR) Community Climate Model (CCM3) will be presented. RRTM is a rapid and accurate k-distribution radiative transfer model that has been developed for the Atmospheric Radiation Measurement (ARM) Program. Among the important features of the RRTM are its connection to radiation

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A High Spectral Resolution Lidar for the Arctic - A Progress Report A High Spectral Resolution Lidar for the Arctic - A Progress Report Eloranta, E.W., Razenkov, I., Kuehn, R., Holz, R., Hedrick, J., and Garcia, J., University of Wisconsin-Madison Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting The University of Wisconsin is constructing a High Spectral Resolution Lidar for deployment in the Arctic. It is designed to operate as an internet appliance and require minimal attention from an onsite attendent. It will provide continuous well calibrated profiles of optical depth, cloud phase and backscatter cross sections. Deployment at the Point Barrow ARM facility is proposed. This poster will describe progess to date. Initial testing has demonstrated that the shared transmitter/reciever telescope design functions properly. While this approach eliminates alignment

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Characterizing Diurnal CO2 Cycles in the Continental Boundary Layer Using Characterizing Diurnal CO2 Cycles in the Continental Boundary Layer Using Precise Concentration Measurements and a Simple Numerical Model Torn, M.S.(a), Riley, W.(a), Rischer, M.L.(a), Biraud, S.(a), and Berry, J.(b), Lawrence Berkeley National Laboratory (a), Carnegie Institution of Washington (b) Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting In continental regions, atmospheric CO2 profiles are strongly influenced by atmospheric dynamics as well as ecosystem and anthropogenic fluxes. Relating site level measurements or atmospheric profiles to regional CO2 budgets may require methods to represent or evaluate these influences. At the Southern Great Plains ARM-CART, we are measuring precise CO2 concentrations continuously at 2-60 m and weekly at 300 and 3300 m agl. CO2

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Validation of TERRA MODIS Cloud Properties Using Ground-Based Measurements Validation of TERRA MODIS Cloud Properties Using Ground-Based Measurements at the DOE ARM SGP Site Dong, X.(a), Xi, B.(a), Minnis, P.(b), Wielicki, B.(b), Sun-Mack, S.(c), Chen,Y.(c), and Mace, G.G.(d), University of North Dakota (a), NASA/Langley Research Center (b), SAIC, Inc. (c), University of Utah (d) Cloud macrophysical and microphysical/optical properties derived from the Moderate Resolution Imaging Spectroradiometer (MODIS) on Terra as part of the Clouds and the Earth's Radiant Energy System (CERES) project during February 2000-December 2001 are compared to simultaneous ground-based observations. The ground-based data taken over the Atmospheric Radiation Measurement (ARM) Program Southern Great Plains (SGP) site are used as cloud truth data set in the validation of the CERES Science Team derived

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On Problems in Simulating Boundary-layer Cumulus Clouds with Third-Order On Problems in Simulating Boundary-layer Cumulus Clouds with Third-Order Turbulence Closure Models Cheng, A.(a) and Xu, K.-M.(b), Atmospheric Sciences, NASA Langley Research Center (a), Center for Atmospheric Sciences, Hampton University (b) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting A hierarchy of third-order turbulence closure models are used to simulate boundary-layer cumulus clouds from the Atmospheric Radiation Measurement in this study. A moist spurious oscillation is found in the Level-3 model, which predicts all third moments. The period of the oscillation is about 1000 s, which is resulted from the interaction of the mean liquid water gradient and the liquid water buoyancy terms in the third-moment equations. A reasonably large diffusion coefficient and a large dissipation at its

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A Partially Prognostic Third-Order Closure Model for Modeling the Boundary A Partially Prognostic Third-Order Closure Model for Modeling the Boundary Layer Cheng, A.C.(a) and Xu, K.-M.(b), Center for Atmospheric Sciences, Hampton University (a), Atmospheric Sciences, NASA Langley Research Center (b) Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting A new partially prognostic third-order closure (TOC) model is developed to model boundary-layer clouds in this study. The model assumes joint double Gaussian distributions of vertical velocity, temperature and moisture. The first and second moments of all variables as well as the third moments of vertical velocity, liquid-water potential temperature and total water mixing ratio are predicted to determine a proper probability density function (PDF). Once the PDF is known, the rest of the third moments and

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Cloud-Radiation-Aerosol Experiment (1996) at IAPh, Russia Cloud-Radiation-Aerosol Experiment (1996) at IAPh, Russia Golitsyn, G.S., Anikine, P.P., and Sviridenkov, M.A., Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences Eighth Atmospheric Radiation Measurement (ARM) Science Team Meeting In 1996, local measurements of the optical properties of the near-surface aerosol were carried out parallel with aureole measurements of the aerosol in the atmospheric column. The spectral radiation was measured by a complex of spectrometers. Global radiation was controlled by standard equipment (pyrheliometer, pyranometer, pyrgeometer). A microwave sounder was used to determine the liquid water path of clouds and water vapor content. Advanced Very High Resolution Radiometer (AVHRR) data from the National Oceanic and

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Raman Lidar Characterization of the Vertical Variability of Aerosols and Raman Lidar Characterization of the Vertical Variability of Aerosols and Water Vapor Over the SGP Ferrare, R.A. (a), Turner, D.D. (b,g), Brasseur, L.H. (c), Tooman, T.P. (d), Dubovik, O. (e), Goldsmith, J.E.M. (d), Ogren, J.A. (f), and Feltz, W. (g), NASA Langley Research Center (a), Pacific Northwest National Laboratory (b), Science Applications International Corporation/NASA/LaRC (c), Sandia National Laboratories (d), SSAI/NASA Goddard Space Flight Center (e), NOAA Climate Monitoring and Diagnostics Laboratory (f), University of Wisconsin-Madison (g) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting The automated Southern Great Plains (SGP) Cloud and Radiation Testbed (CART) Raman Lidar routinely measures profiles of water vapor mixing ratio,

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Long-Period Variations of UV-B Radiation From Results of Ozone Long-Period Variations of UV-B Radiation From Results of Ozone Reconstruction from Dendrochronologic Data Zuev, V.V. and Bondarenko, S.L., Institute of Atmospheric Optics Russian Academy of Sciences Tomsk, Russia Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting The thickness of stratospheric ozone layer modulates the level of UV-B radiation reaching the surface without cloudiness. The high level of UV-B radiation causes a stress of vegetation including trees. The stress-induced changes in physiologic processes are reflected in tree ring characteristics. The multi-centennial history of ozonosphere behavior is contained in annual tree rings on the basis of response to UV-B radiation effect. The dendrochronologic time series are statistically representative,

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161

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3-D Reconstruction of a Regional-Scale Cloud Field from Satellite Data 3-D Reconstruction of a Regional-Scale Cloud Field from Satellite Data for Use in a Broadband Monte Carlo Radiative Transfer Model Galinsky, V., Ramanathan, V., Boer, E., Podgorny, I., and Vogelmann, A. M., Center for Atmospheric Sciences-Scripps Institution of Oceanography Eighth Atmospheric Radiation Measurement (ARM) Science Team Meeting The absence of realistic 3-D cloud fields and their associated radiative transfer in current general circulation models (GCM) or radiative transfer models may result in large inconsistencies in the Earth's energy budget calculations. We investigate these effects by reconstructing the regional-scale, 3-D cloud field structure from multi-spectral satellite imagery. From this reconstruction, we compute the radiative fluxes using a

162

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Using a MFRSR to Calculate Direct and Diffuse Broadband Measurements from Using a MFRSR to Calculate Direct and Diffuse Broadband Measurements from Global Broadband Measurements Cornwall, C.R. (a,b), Hodges, G.B. (a,b), and DeLuisi, J.D. (b), University of Colorado Cooperative Institute for Research in Environmental Sciences (a), NOAA Air Resources Lab (b) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting Research Objective: To infer values of direct solar irradiance using data from a Multi-Filter Rotating Shadowband Radiometer (MFRSR) and a broadband pyranometer measuring global horizontal irradiance. Methodology: The MFRSR measures global and diffuse radiation over six narrow spectral bands as well as one broadband (silicon pyranometer). Values for corresponding direct normal irradiances are automatically calculated as part of the MFRSR

163

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An Anthology of Tropical Convection: Dynamical and Thermodynamical An Anthology of Tropical Convection: Dynamical and Thermodynamical Interactions and the Organization of Large-Scale Tropical Convection Webster, P.J., Program in Atmospheric and Oceanic Sciences, University of Colorado Ninth Atmospheric Radiation Measurement (ARM) Science Team Meeting There appears to be no universal relationship between large-scale organized convection and the magnitude of sea surface temperature (SST). Convection and mean precipitation maxima are often found on the equatorward side of maximum SST or even in the winter hemisphere of the tropics. Thus, there must exist other rules besides thermodynamical forcing that provide necessary conditions for convection. A survey of large-scale organized convection has been conducted in order to find necessary conditions for the

164

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Variations in the Ratio of IR Window Radiance to Microwave Water Path Variations in the Ratio of IR Window Radiance to Microwave Water Path Observed Under Cloudless Convection Platt, C.M.(a) and Austin, R.T.(b), Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting The measurement of the radiance of cirrus (and other) clouds at atmospheric window 8-13 micron wavelengths requires a correction for the water vapor radiance and transmittance below the clouds. Calculating radiances at the times of routine radiosonde ascents and interpolating the radiance/water path ratio between ascents can achieve this. However it has been observed experimentally that IR radiance/water path ratios appear to vary between radiosonde ascents away from the interpolated values. This occurs

165

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Sun Photometer Laser and Lamp Based Radiometric Calibrations Sun Photometer Laser and Lamp Based Radiometric Calibrations Allen, D.W.(a), Souaidia, N.(a), Pietras, C.(b), Brown, S.(a), Lykke, R.(a), Frouin, R.(c), Deschamps, P.Y.(d), Fargion, G.(b), and Johnson, B.C.(a), National Institute of Standards and Technology (a), National Aeronautics and Space Administration, SAIC (b), Scripps Institution of Oceanography (c), Laboratoire d'Optique Atmospherique, France (d) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting The goals of this study were to calibrate the radiometers using independent methods, evaluate the uncertainties for each method, and assess the influence of the results in terms of the science requirements. The radiometers were calibrated in irradiance and radiance mode using a monochromatic, laser-illuminated integrating sphere, in radiance mode using

166

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Comparison of Measurements of Liquid Water Path Comparison of Measurements of Liquid Water Path Lane, D.E. (a), Fairall, C.W. (b), Hazen, D. (b), and Orr, B. (b), Cooperative Institute for Research in Environmental Science, University of Colorado, Boulder (a), Environmental Technology Laboratory, National Oceanic and Atmospheric Administration, Boulder (b) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting Investigation of ship-based microwave radiometer observations from the equatorial Pacific during EPIC 99 indicated anomalously high values of liquid water content during clear sky conditions. Several possible sources of error were examined including the radiative transfer model employed to the original sondings, and application of the TIP calibrations. Further research has suggested that incorrect brightness temperatures were observed

167

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Introducing WEB_MADS Introducing WEB_MADS Dedecker, R.G., Quinn, G.M., Garcia, R.K., and Revercomb, H.E., University of Wisconsin-Madison Space Science and Engineering Center Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting The Multiple AERI Display System (MADS) is a software package developed to allow remote access to and viewing of the operational AERI data streams produced by remotely operated AERI instruments. The MADS system was developed some years ago and operates on stand alone Personal Computers that run the OS/2 operating system and that acquire remote AERI data via the Internet. WEB-MADS is a Web based prototype version of MADS that allows remote access to the same AERI data and information using any standard Web Browser. As was the case with the original MADS, WEB-MADS provides a means for real

168

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Detection of Thin Cirrus using a Combinaton of 1.38-um Reflectance and Detection of Thin Cirrus using a Combinaton of 1.38-um Reflectance and Window Brightness Temperature Difference Roskovensky, J.K. and Liou, K.N., Department of Atmospheric Sciences University of California, Los Angeles Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting A new cloud detection scheme has been developed that utilizes 1.38-um reflectance in combination with 8.6-11 um brightness temperature difference to detect cirrus clouds. The 1.38-um channel on board MODIS is useful in detecting thin cirrus due to its high sensitivity to upper tropospheric clouds and a nearly negligible sensitivity to low-level reflectance. Dependent upon neighboring cloud type, water vapor concentration, and the viewing geometry, specific 1.38-um reflectance threshold levels can be

169

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Lidar Remote Sensing of Cirrus Clouds at the Southern Great Plains Site: Lidar Remote Sensing of Cirrus Clouds at the Southern Great Plains Site: Comparisons of Extinction and Backscatter Coefficients Derived Using Raman and Backscatter Lidar Technique Comstock, J.M.(a), Fu, Q.(b), Turner, D.D.(c), and Ackerman, T.P.(a), Pacific Northwest National Laboratory (a), Department of Atmospheric Sciences, University of Washington (b), University of Wisconsin/Pacific Northwest National Laboratory(c) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting Horizontal and vertical inhomogeneity of cirrus clouds is an important issue in radiation modeling and the representation of cirrus clouds in general circulation models (GCMs). Lidar remote sensing is a useful tool for determining the vertical structure of cirrus clouds. Backscatter

170

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The Topography of Cloud Tops The Topography of Cloud Tops Pincus, R., Gunshor, M., Space Science and Engineering Center, University of Wisconsin-Madison; Marshak, A., and Wiscombe, W., National Aeronautics and Space Administration-Goddard Space Flight Center Ninth Atmospheric Radiation Measurement (ARM) Science Team Meeting The geometric shape of cloud top affects the amount and distribution of radiation reflected by the cloud. The angular redistribution is more relevant to remote sensing applications, while changes in the total amount of energy reflected affect cloud albedo. The difference between reflection by "bumpy" and plane-parallel clouds is greatest when both clouds and bumps are optically thick and solar zenith angle low. Quantitative assessment of these effects requires a description of topography of a cloud top. We

171

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A Semianalytic Technique to Speed Up Successive Order of Scattering Model A Semianalytic Technique to Speed Up Successive Order of Scattering Model for Optically Thick Media Duan, M. and Min, Q., Atmospheric Sciences Research Center, State University of New York Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting A semianalytic technique has been developed to speed up integration of radiative transfer over optically thick media for the successive order of scattering method. Based on characteristics of internal distribution of scattering intensity, this technique uses piece-wise analytic eigenfunctions to fit internal scattering intensities and integrates them analytically over optical depth. This semianalytic approach greatly reduces the number of sub-grids for accurately solving radiative transfer based on

172

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Cloud-Resolving Simulations of Boundary-Layer Cloud Regimes with a Cloud-Resolving Simulations of Boundary-Layer Cloud Regimes with a Third-Order Turbulence Cheng, A.(a,b) and Xu, K.-M.(a), Atmospheric Sciences, NASA Langley Research Center (a), Hampton University (b) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting LES (large eddy simulation) models can explicitly resolve large turbulent eddies, which contain m ost of the turbulent kinetic energy and do most of the transport in the boundary layer. These edd ies have to be parameterized in cloud-resolving models (CRMs), which have much coarser resolution . A sophisticated turbulent parameterization is needed in order to produce adequate simulations o f cloud processes in CRMs. Most CRMs use a one- and a half-order prognostic turbulent kinetic ene rgy closure. Third-order

173

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Spectral Diffuse Irradiance in UV, VIS, and NIR During the 2001 Diffuse IOP Spectral Diffuse Irradiance in UV, VIS, and NIR During the 2001 Diffuse IOP Kiedron, P., Michalsky, J., Berndt, J., Min, Q., and Harrison, L., Atmospheric Sciences Research Center, SUNY Albany, New York Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting Two rotating shadowband spectroradiometers (RSS) participated in the 2001 Diffuse IOP. The UV-RSS covered the 300-360 nm range and the VIS-NIR RSS covered 360-1050 nm. Both instruments were calibrated with NIST traceable spectral irradiance. The two instruments were able to measure approximately 95% of total diffuse radiation for clear-sky conditions. The missing shortwave infrared beyond 1050 nm is estimated with a model in order to calculate a total shortwave irradiance. The results are compared with

174

ARM - Publications: Science Team Meeting Documents  

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MOD06 Cloud Products and the ARM SGP Zhang, Y.(a) and Mace, G.G.(b), University of Utah (a), University of Utah (b) Thirteenth Atmospheric Radiation Measurement (ARM) Science...

175

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The ARM-UAV Grand Tour, SGP, NSA, TWP Tooman, T.T., Bolton, W.B.(a), and McCoy, R.F.(a), Sandia National Laboratories (a) Thirteenth Atmospheric Radiation Measurement (ARM) Science...

176

Tenth ARM Science Team Meeting Proceedings, San Antonio, Texas...  

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synop obs not assimilated). Tenth ARM Science Team Meeting Proceedings, San Antonio, Texas, March 13-17, 2000 2 Temperature Errors in the Tropics The model systematic...

177

ARM - Publications: Science Team Meeting Documents  

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Ackerman, T.P.(a), and Clothiaux, E.E.(b), Pacific Northwest National Laboratory (a), The Pennsylvania State University (b) Twelfth Atmospheric Radiation Measurement (ARM) Science...

178

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Angular Distribution of Intensity in a Flux of Radiation Scattered by a Angular Distribution of Intensity in a Flux of Radiation Scattered by a Cloud Dvoryashin, S.V., Shukurov, K.A., Shukurov, A.K., and Golitsyn, G.S., A.M.Obukhov Institute of Atmospheric Physics, RAS Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting A study of the angular distribution of intensity in a flux of solar radiation scattered by a cloud was carried out in conditions of translucent clouds (the disk of the Sun is visible). Using the digital video camera KODAK DC200, mounted on the sun tracker, the sky images with the angle of view 38 0) have been obtained in cloudy and cloudless conditions. During measurements the disk of the Sun was closed with a blend. Using the specially developed program the photometry of the received images was

179

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Whole-Sky Imager Data Retrieval Whole-Sky Imager Data Retrieval Tooman, T.P., Christensen, G.J., Sandia National Laboratories; Shields, J., and Karr, M., Marine Physical Laboratory, Scripps Institution of Oceanography, University of California San Diego; Moore, S., and Sowle, D., Mission Research Corporation Ninth Atmospheric Radiation Measurement (ARM) Science Team Meeting The Whole-Sky Imager (WSI) is an automated imager used for assessing and documenting cloud fields and cloud field dynamics. Four WSI instruments have been deployed on hard surfaces: one in the Southern Great Plains, two in the Tropical Western Pacific, and one in the North Slope of Alaska. Additionally another instrument has been deployed on an ice breaker in the Polar Ice Cap - Surface Heat Budget of the Arctic (SHEBA). These electronic

180

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A Comparison of Surface Sensible Heat Flux at Atqasuk and Barrow A Comparison of Surface Sensible Heat Flux at Atqasuk and Barrow Shaw, W.J. (a), Doran, J.C. (b), and Hubbe, J.M. (c), Pacific Northwest National Laboratory Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting As part of the effort to discover the feedbacks between low-level arctic stratus and surface fluxes, we have operated an acoustic anemometer near Barrow, Alaska and a dual wavelength scintillometer near Atqasuk, which is 100 km to the south, in order to measure the surface turbulence heat flux. The systems operated unattended during the spring melt period of 2000, and the data were logged via internet or telephone connections. The acoustic anemometer was mounted on a tower attached to a barge grounded on a low island on the northeast side of Elson Lagoon. The anemometer was 8.5 m

Note: This page contains sample records for the topic "arm science team" 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

ARM - Publications: Science Team Meeting Documents  

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A Satellite Cloud, Radiation and Precipitation Data Set for Cloud Model A Satellite Cloud, Radiation and Precipitation Data Set for Cloud Model Evaluation Xu, K.-M.(a), Wielicki, B.A.(a), Wong, T.(a), and Randall, D.A.(b), NASA Langley Research Center (a), Colorado State University (b) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting To systematically evaluate cloud models including large-eddy simulation (LES), cloud-resolving models (CRMs), cloud parameterizations in general circulation models (GCMs), one needs a large set of cloud, radiation and precipitation data that are matched with simultaneous atmospheric state data. We have been using a technique to produce such a data set at the NASA Langley Research Center. Specifically, this technique classifies EOS (Earth Observing System) satellite data into distinct cloud systems or "cloud

182

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NCDX: NetCdr Data eXtraction utility for Examination and Visualization of NCDX: NetCdr Data eXtraction utility for Examination and Visualization of Netcdf Data Flynn, C.J. and Ermold, B., Pacific Northwest National Laboratory Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting NCDX is a command-line utility designed for routine examination and extraction of data from netcdf files. Data can be displayed graphically (line-plot, scatter-plot, overlay, color-intensity, etc.) or extracted as ASCII data. In either case, results can be saved to disk or viewed directly on screen. Date and time can be displayed in a large variety of formats including calendar, julian, HHMMSS, fractional day, and others. It can accept multiple netcdf files as input producing merged results. NCDX can be used in either interactive or batch-processing mode making it suitable for

183

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Absolute Radiance Calibration Techniques for the Whole Sky Imager Absolute Radiance Calibration Techniques for the Whole Sky Imager Shields, J.E. (a), Johnson, R.W. (a), Tooman, T.P. (b), Karr, M.E. (a), Burden, A.R. (a), and Baker, J.G. (a), Scripps Institution of Oceanography (a), Sandia National Laboratories (b) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting The Day/Night Whole Sky Imager is designed to provide absolute radiance distributions over the full upper hemisphere, as well as providing an assessment of cloud fraction and cloud spatial properties. In order to provide radiance distributions, the instrument must be calibrated using absolute radiometry techniques adapted for use with an imager. These techniques are particularly demanding due to the large dynamic range required to acquire data from full daylight to starlight. For example, a

184

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Activation Control: An Alternate Framework for Explaining Variation of Deep Activation Control: An Alternate Framework for Explaining Variation of Deep Convection Barr-Kumarakulasinghe, S.A., Brookhaven National Laboratory Eighth Atmospheric Radiation Measurement (ARM) Science Team Meeting An alternate conceptual framework with the ability to explain large scale variation in convection, but still have the ability to explain shorter time scale (weekly) variation of convection is presented. In contrast, the current quasi-equilibrium and statistical equilibrium control framework, appears to be only successful in explaining monthly and large scale variations in convection and circulation patterns. Mapes has referred to an alternate concept as activation control, though not actually offering a solution or methodology. This abstract presents an activation control

185

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Evaluation of the Plane-Parallel Model from MISR Measurements Evaluation of the Plane-Parallel Model from MISR Measurements Horvath, A.(a), Davies, R.(b), and Diner, D.J.(b), University of Arizona (a), Jet Propulsion Laboratory (b) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting Due to its simplicity and computational speed, the 1-D plane-parallel model enjoys widespread popularity in the satellite remote sensing of cloud microphysical properties. Just how well this model describes real clouds is a question rather difficult to answer with traditional single-angle observations. With the advent of near-simultaneous multiangle measurements, it is possible to evaluate the validity of the plane-parallel approach. This study used data from the Multiangle Imaging SpectroRadiometer (MISR) on NASA's TERRA (EOS-AM) platform. Only liquid clouds over oceans were

186

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Simulation of the Annual Cycle of Surface Albedo for SHEBA Simulation of the Annual Cycle of Surface Albedo for SHEBA Schramm, J.L., and Curry, J.A., University of Colorado Ninth Atmospheric Radiation Measurement (ARM) Science Team Meeting A single-column ice thickness distribution model is used to simulate the annual cycle of sea ice, snow and surface radiation characteristics over the Surface Heat Budget of the Arctic Ocean (SHEBA). The model is forced using surface flux data obtained at SHEBA. This poster focuses on the simulated surface albedo and the principal factors that determine it (snow and melt ponds). By comparing the model simulations with SHEBA observations, an assessment of our current parameterizations of snow, melt ponds and surface albedo is given. Some improvements to our model parameterizations have already been made based upon the comparison with

187

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Cloud Fraction Retrieval Utilizing Whole Sky Imagers Cloud Fraction Retrieval Utilizing Whole Sky Imagers Tooman, T.P., Sandia National Laboratories; Moore, S., and Sowle, D., Mission Research Corporation; Shields, J., Marine Physical Laboratory Eighth Atmospheric Radiation Measurement (ARM) Science Team Meeting Long-term statistics on cloud cover and cloud thickness are desirable for understanding how clouds affect climate. We are attempting to use images collected by the Whole Sky Imager (WSI) to extract this information. For nighttime retrieval, we intend to develop algorithms and software to detect star occultations due to clouds. For daytime retrievals, we intend to develop an appoach based on sky radiance variations. We have implemented software to detect star locations, to map image pixel space to celestial

188

ARM - Publications: Science Team Meeting Documents  

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Parameterization of Cloud-Radiation Interactions as Relevant to Climate Parameterization of Cloud-Radiation Interactions as Relevant to Climate Models: A New Dimension Stephens, G.L.(a), Wood, N.B.(a), Barker, H.W.(b), and Gabriel,P.(a), Colorado State University (a), Meteorological Service of Canada (b) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting The parameterization of cloud-radiation interactions involve a number of levels of approximation. The focus of past programs like ICRCCM and I3RC have been directed largely towards assessing methods of solution while other efforts have gone into evaluating the parameterization of cloud optical properties. The parameterization of unresolved cloud variability, however, has received much less attention. A study that attempts to assess a number of the current empirical sub-grid parameterization methods has

189

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Stratus Microphysical Parameters Using Radar and Visible Stratus Microphysical Parameters Using Radar and Visible Optical Depth Austin, R.T. and Stephens, G.L., Colorado State University, Fort Collins Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting A new algorithm for the retrieval of stratus cloud microphysical parameters was introduced last year and applied to measurements of maritime stratus clouds off the coast of California. The retrieval has been refined and applied to data from the Southern Great Plains CART site, as well as to the original California marine measurements. The poster will describe these refined results, discuss error analysis of the algorithm, show how the retrieval compares with analogous radar-only retrievals, and discuss other products and benefits of the algorithm's estimation theory formulation

190

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Retrievals of Vertical Profiles of Cloud Ice Mass and Particle Retrievals of Vertical Profiles of Cloud Ice Mass and Particle Characteristic Size from MMCR Data Matrosov, S.Y.(a), Heymsfield, A.J.(b), Shupe, M.D.(c), and Korolev, A.V.(d), CIRES, University of Colorado and NOAA ETL (a), NCAR (b), STC (c), Canadian Atmospheric Service (d) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting A remote sensing method is proposed for the retrievals of vertical profiles of ice cloud microphysical parameters from ground-based measurements of radar reflectivity and Doppler velocity with a vertically pointed cloud radar. This method relates time-averaged Doppler velocities (which are used as a proxy for the reflectivity weighted particle fall velocities) to particle characteristic sizes such as median or mean. With estimated

191

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Spectral Characterization of the Scattering and Absorption of Solar Spectral Characterization of the Scattering and Absorption of Solar Radiation by Aerosols and Clouds: Results from Several Recent Field Studies Pilewskie, P.(a), Rabbette, M.(b), Bergstrom, R.(b), Pommier, J.(b), and Howard, S.(b), NASA Ames Research Center (a), Bay Area Environmental Research Institute (b) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting Efforts to reduce the uncertainty in climate forcing due to the radiative effects of aerosols and clouds have led to the improvement of radiometric sensors used to measure the spectral distribution of solar radiation in the atmosphere. Because much of our current understanding of the solar radiation budget is derived from broadband (spectrally integrated) observations, newer spectrally resolved observations need to be examined in

192

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Photoacoustic Instrument for Measurement of Aerosol or Gaseous Light Photoacoustic Instrument for Measurement of Aerosol or Gaseous Light Absorption Arnott, W.P., Moosmuller, H., and Rogers, C.F., Desert Research Institute Ninth Atmospheric Radiation Measurement (ARM) Science Team Meeting A photoacoustic instrument has been developed and evaluated for measurement of aerosol light absorption. This instrument produces a direct measure of absorption by use of a calibrated microphone and determination of laser power, in contrast to filter methods that require empirical calibration and are subject to strong effects of aerosol extinction. The instrument was evaluated during the winter of 1996-97 in Brighton, Colorado, during the North Front Range Air Quality Study (NFRAQS). Results of the instrument intercomparison with other methods during NFRAQS will be given along with

193

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The Clear-Sky Diffuse 'Problem' at SGP: RSS Data & Analysis The Clear-Sky Diffuse 'Problem' at SGP: RSS Data & Analysis Harrison, L., Kiedron, P., and Min, Q., State University of new York, Albany Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting We analyze the spectral RSS data from the fall of 1999, when there were an unusual series of clear-sky cloud-free days at SGP. The RSS makes measurements of the spectral diffuse/direct ratio which are independent of calibration. We also extract typical optical depth analyis data from Langley regressions, and we retrieve column NO2 from correlation spectroscopy. We show that column NO2 is often well above clean-climatological background at SGP, and that this interacts with simple forms of aerosol-optical depth retrievals (which do not account for this)

194

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A New Approach for Obtaining Advection Profiles: Application to the SHEBA A New Approach for Obtaining Advection Profiles: Application to the SHEBA Column Morrison, H.(a) and Pinto, J.O.(b), University of Colorado (a), NCAR/University of Colorado (b) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting Time-averaged vertically-integrated 3-D advections are inferred from heat and moisture budgets obtained from observations at SHEBA for April, May, June and July. Advection was a source of heat and moisture in the column budgets during the time period, balanced mostly by precipitation and radiative cooling. These inferred advections are used to evaluate and correct the 3D temperature and water vapor advection profiles obtained from operational forecasts of the ECMWF model. Advections from the ECMWF model are generally too warm and moist, particularly in July. These biases lead

195

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Evaluating Stochastic Radiative Transfer Evaluating Stochastic Radiative Transfer Lane, D.E. (a), Somerville, R.C.J. (b), and Iacobellis, S.F. (b), CIRES, University of Colorado, Boulder (a), Scripps Institution of Oceanography, University of California, San Diego (b) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting Stochastic modeling is a promising technique for representing shortwave radiative transfer through scattered, low-level clouds. A distinct advantage of this approach is that a stochastic model can accurately calculate the radiative heating rates through a broken cloud layer without requiring an exact description of the cloud geometry. In this paper a single-column model is employed to quantify the influence of the stochastic approach on model thermodynamics for times when broken cloud fields were

196

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Estimation of Temperature Effect of Fires Near Moscow in Summer-Fall 2002 Estimation of Temperature Effect of Fires Near Moscow in Summer-Fall 2002 Mokhov, I.I. and Gorchakova, I.A., Obukhov Institute of Atmosphere Physics RAS, Russia Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting Local effect of cooling ΔT due to peatbog and forest fires near Moscow in summer-fall 2002 is estimated. These estimates are based on coordinated measurements at the Zvenigorod Scientific Station (55°42'N, 36°46'E) of our Institute. Continuous measurements of radiation balance components at the surface together with meteorological and aerological observations and determination of the aerosol optical depth τ were used to calculate the aerosol radiative forcing (ARF) at the surface ARF(0), at the top of the atmosphere ARF(∞), and for the whole atmosphere ARF (∞)- ARF(0).

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Numerical Tests of the Cloud-Surface Interaction Based Broken-Cloud Field Numerical Tests of the Cloud-Surface Interaction Based Broken-Cloud Field Optical Depth Retrieval: Sensitivity to Surface Albedo, Droplet Phase Function, Aerosol, and Instrument Noise Beaulne, A.(a), Barker, H.W.(b), Blanchet, J.P.(a), Pavloski, C.F.(c), Clothiaux, E.E.(c), and Marshak, A.(d), Universite du Quebec a Montreal (a), Environment Canada (b), The Pennsylvania State University (c), NASA-GSFC (d) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting The algorithm proposed by Barker and Marshak for inferring optical depth of broken clouds using surface radiometric data has been subject to several sensitivity tests. These include the impacts of uncertainties in specification of effective local surface albedo, droplet phase function,

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Seasonal Variability in Cloud Cover, Cloud Base Height, and Cloud Liquid Seasonal Variability in Cloud Cover, Cloud Base Height, and Cloud Liquid Water Content at the North Slope of Alaska and the Adjacent Arctic Ocean Takara, E.E. and Ellingson, R.G., University of Maryland Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting It is well known that complete radiative transfer calculations for broken cloud fields are extremely complex and time consuming. Furthermore, the solution for a particular broken cloud field is not particularly useful for evaluating cloud effects. For that reason, is common to parameterize the cloud effects by using an effective cloud fraction. In general circulation models, it is common to use theabsolute cloud amount as the effective cloud fractions. This can be an effective for cloud fields where the cloud

199

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Evidence for Aerosol Effects on AERI Clear-Sky Radiance at the SGP Evidence for Aerosol Effects on AERI Clear-Sky Radiance at the SGP Ma, Y., and Ellingson, R.G., University of Maryland Ninth Atmospheric Radiation Measurement (ARM) Science Team Meeting The Atmospheric Emitted Radiance Interferometer (AERI) Line-by-Line Radiative Transfer Model (LBLRTM) Quality Measurement Experiment (QME) 10-micron window residuals have been examined relative to the Multifilter Rotating Shadowband Radiometer (MFRSR) 0.87-micron optical depth for clear-sky periods during 1997-98. The analysis shows an increasing aerosol influence on the downwelling radiance with aerosol optical depth for columnar water totals below about 3 cm. Above 3 cm, the residuals become negatively correlated with both aerosol optical depth and precipitable water. This change in the characteristics suggests that the current LBLRTM

200

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A New Water Vapor Continuum Model: MT_CKD_1.0 A New Water Vapor Continuum Model: MT_CKD_1.0 Mlawer, E.J.(a), Clough, S.A.(a), and Tobin, D.C.(b), Atmospheric and Environmental Research, Inc. (a) University of Wisconsin - Madison (b) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting For the first time since its inception, a new formulation for the CKD approach to the water vapor continuum has been generated. This new version is designated MT_CKD_1.0. The original CKD formulation, derived in 1980 based upon laboratory measurements due to Burch and collaborators, applied an empirically derived multiplicative factor (different for the self and foreign continua) to the line wing of the impact line shape. This resulted in a line shape that was super-Lorentzian in the near and intermediate line

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201

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Retrieval of Mean Cosine of Aerosol Phase Function from Extinction and Sky Retrieval of Mean Cosine of Aerosol Phase Function from Extinction and Sky Brightness Measurements Zhuravleva, T.B.(a), Sviridenkov, M.A.(b), and Anikin, P.P.(b), Institute of Atmospheric Optics SB RAS, Tomsk, Russia (a), A.M. Obukhov Institute of Atmospheric Physics RAS, Moscow, Russia (b) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting Asymmetry of the aerosol phase function together with optical thickness drive the magnitude of the aerosol radiative forcing. Two approaches are usually used to obtain the mean cosine of the phase function retrieval of the single scattering phase function from sky brightness measurements or calculations for the given aerosol size distribution and refractive index. We studied the possibility to determine the mean cosine directly from

202

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A Comparison of High Spectral Resolution Infrared Cloud Boundary Algorithms A Comparison of High Spectral Resolution Infrared Cloud Boundary Algorithms using S-HIS and AERI Measurements Holz, R.E.(a), Antonelli, P.(a), Ackerman, S.(a), McGill, M.J.(a), Nagel, F.(a), Feltz, W.F.(a), and Turner, D.D.(b), Univeristy of Wisconsin, Madison (a), Pacific Northwest National Laboratory (b) Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting Cloud top pressure is an important parameter in determining the radiative impact of clouds on climate. In addition, atmospheric temperature and moister retrievals of cloudy scenes using high spectral resolution data require the cloud altitude be known. The S-HIS is scheduled to fly on the Proteus during the upcoming M-PACE experiment. In addition to the SHIS a lidar system and an imager will accompany the SHIS during MPACE. This paper

203

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Radiosonde Intercomparison During the Fall 2000 Water Vapor IOP Radiosonde Intercomparison During the Fall 2000 Water Vapor IOP Lesht, B.M. (a) and Richardson, S.J. (b), Argonne National Laboratory (a), University of Oklahoma (b) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting We conducted 160 dual-radiosonde soundings during the fall 2000 Water Vapor Intensive Operations Period (WVIOP). The soundings were done every three hours at the SGP/CART site central facility from 1430 on 18 September 2000 through 1130 on 8 October 2000. The dual soundings included Vaisala RH-80H radiosondes from four different calibration lots as well as Vaisala RS-90 radiosondes. The radisondes were distributed during the experiment so as to conduct pairwise comparisons between RS-80s, RS-90s and RS-80s/RS-90s. Prior to the WVIOP we tested the calibration of these types of radiosondes

204

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Application of a Non-local Turbulence Closure Scheme to a Single Column Application of a Non-local Turbulence Closure Scheme to a Single Column Model Ghan, S.J. (a) and Moeng, C.-H. (b), Pacific Northwest National Laboratory (a), National Center for Atmospheric Research (b) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting A non-local countergradient transport term is added to a turbulence kinetic energy scheme embedded in a single column model (SCM). The countergradient term is expressed in terms of a planetary boundary layer (PBL) velocity scale, the vertical profile of diffusivity, the depth of the PBL, and the fluxes of heat and moisture at the surface and at the top of the PBL. The fluxes at the top of the PBL are expressed in terms of the cloud top radiative cooling rate, the jump in liquid potential temperature and total

205

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Analysis of Humidity Halos Around Trade Wind Cumulus Clouds Analysis of Humidity Halos Around Trade Wind Cumulus Clouds Lu, M.-L.(a), Wang, J.(b), Freedman, A.(c), Jonsson, H.H.(d), Flagan, R.C.(a), McClatchey, R.A.(c), and Seinfeld, J.H.(a), California Institute of Technology (a), Brookhaven National Laboratory (b), Aerodyne Research, Inc. (c), Naval Postgraduate School (d) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting Regions of enhanced humidity in the vicinity of cumulus clouds, so-called cloud halos, reflect features of cloud evolution, exert radiative effects and may serve as a locus for new particle formation. We describe here the results of an aircraft sampling campaign carried out near Oahu, Hawaii from July 31- Aug. 10, 2001, aimed at characterizing the properties of trade wind cumulus cloud halos. An Aerodyne Research Inc. fast spectroscopic

206

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Radar Observations of Large-Eddy Circulations and Turbulence in Boundary Radar Observations of Large-Eddy Circulations and Turbulence in Boundary Layer Clouds Albrecht, B.A. and Kollias, P., Umiversity of Miami Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting With the development and application of Doppler short wavelength radars, there has been an increased capability for explicitly resolving the vertical structure of boundary layer cloud circulations. Further, Doppler mm-wavelength radars used in a vertically pointing mode can provide information on the turbulence structure within the cloud volume sampled by the radar. Since these radar large eddy observations (LEO) are of the same resolution as that of Large Eddy Simulation models, they provide a means for explicitly evaluating LES (LEO for LES). Further the radar observations

207

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Full Spectrum Correlated-k for Shortwave Atmospheric Radiative Transfer Full Spectrum Correlated-k for Shortwave Atmospheric Radiative Transfer Pawlak, D.T.(a,b), Clothiaux, E.E.(a), Modest, M.M.(c), and Cole, J.N.S.(a), Department of Meteorology, The Pennsylvania State University (a), Air Force Institute of Technology, Civilian Institutions Graduate Programs Division (b), Department of Mechanical Engineering, The Pennsylvania State University (c) Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting Fast and accurate atmospheric radiation heating and cooling rate calculations are important for improving global climate and numerical weather prediction model performance. The radiative transfer calculations in atmospheric models must be fast so that the underlying methods can actually be implemented in the models and the calculations must be accurate

208

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The Absorption of NIR Solar Radiation by Precipitation The Absorption of NIR Solar Radiation by Precipitation Evans, W.F.J.(a) and Puckrin, E.(b), Physics Department, Trent University (a), DRDC,Canada (b) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting It has recently been shown by Ackerman (Physics Today; 2003) that good radiation codes can model the absorption of up to 100 W/m2 of short wave by clouds. However, spectral measurements of the transmission of solar infrared radiation through clear and cloudy skies with FTIR spectroscopy have indicated that still are certain clouds which absorb unexpectedly large amounts of near-infrared (NIR) radiation. The amounts are unexpected in the sense that radiation codes, including sophisticated algorithms such as MODTRAN4, do not model this strong NIR absorption effect. The absorption

209

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Aerosol Enhancement of Cloud Albedo Shown by Satellite Measurements and Aerosol Enhancement of Cloud Albedo Shown by Satellite Measurements and Chemical Transport Modeling Schwartz, S.E. (a), Harshvardhan (b), and Benkovitz C.M.(a), Brookhaven National Laboratory (a), Purdue University (b) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting The Twomey effect of enhanced cloud droplet concentration, optical depth, and albedo due to anthropogenic aerosols is thought to contribute substantially to radiative forcing of climate change over the industrial period. Present model-based estimates of this indirect forcing are highly uncertain. Increased cloud drop concentration and decreased effective radius indicative of the indirect effect have previously been shown in interhemispheric comparisons of satellite remote sensing data, but efforts

210

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The Darwin 2005 IOP The Darwin 2005 IOP May, P.T.(a), Jakob,C.(a), Long, C.N.(b), and Keenan, T.D.(a), Bureau of Meteorology Research Centre (a), Pacific Northwest National Laboratory (b) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting A major field project is planned for Darwin in January to February 2005. Amongst its aims are the study of the structure and evolution of cirrus in monsoonal convection and how it differs from coastal and island storm generated cirrus, providing a data set suitable for CRM and SCM single column modeling efforts and validation of ground based remote sensors. Northern Australia experiences three distinct cloud regimes, a pronounced dry season, a transition season dominated by deep coastal convection and continental squall lines and a monsoon where the convection has a

211

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A Climatology of Cloud & Radiative Properties Derived from GMS-5 Data Over A Climatology of Cloud & Radiative Properties Derived from GMS-5 Data Over the Tropical Western Pacific Nordeen, M.L.(a), Doelling, D.R.(a), Khaiyer, M.M.(a), Rapp, A.D.(a), and Minnis, P.(b), Analytical Services & Materials, Inc. (a), National Aeronautics and Space Administration-Langley Research Center (b) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting Satellite derived cloud and radiative properties can provide continuous spatial and temporal coverage over the Tropical Western Pacific (TWP). The TWP is an area with few meteorological stations, but is an interesting region in global climate studies. Starting with the Nauru99 Intensive Operational Period (IOP) (June-July 1999), two years of hourly Geostationary Meteorological Satellite (GSM-5) images are used in the

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Resolving Models as Scaffolding for Cloud Parameterizations in Resolving Models as Scaffolding for Cloud Parameterizations in Large-Scale Models Pincus, R.(a), Klein, S.A.(b), Hannay, C.(a), and Xu, K.-M.(c), NOAA-CIRES Climate Diagnostics Center (a), NOAA Geophysical Fluid Dynamics Laboratory (b), NASA Langley Research Center (c) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting The treatment of clouds in large scale models has evolved from fixed to diagnostics to predictive as the importance of cloud feedbacks has become clear. In development now are schemes which account for the resolution-dependent sub-grid scale variability in condensate, which is thought to be a significant factor driving ad hoc model tuning. Parameterizations have their roots in theory, experiment, and observational data. It's very hard, though, to observe the four-dimensional structure of

213

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Some Results of the Comparison of the Solar Almucantar Sky Brightness Some Results of the Comparison of the Solar Almucantar Sky Brightness Observed Under the Cirri Conditions and the Calculated One Petrushin, A.G.(b), Shukurov, A.K.(a), Shukurov, K.A.(a), and Golitsyn, G.S.(a), A.M. Obukhov Institute of Atmospheric Physics, RAS (a), Institute of Experimental Meteorology, NPO "Typhoon" (b) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting The selected measurements of the solar almucantar sky brightness were carried out at the Zvenigorod Research Facility of the A.M.Obukhov Institute of Atmospheric Physics (IAPh) RAS using the scanning photometer [1] developed in IAPh. These measurements were took place at the cloudy sky and the clear one and at various optical depth t that was controlled with

214

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A Continuous Initial Estimate of Cloud Microphysical Structure Using A Continuous Initial Estimate of Cloud Microphysical Structure Using Surface-Based Remote Sensors and Parameterized Microphysics Miller, M.A. and Johnson, K.L., Brookhaven National Laboratory Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting Realistic heating rate profiles require an accurate and continuous accounting of cloud microphysical structure. To date, several highly constrained microphysical retrieval algorithms have been designed that operate on specific cloud systems. These algorithms are sufficiently specialized that they are generally applicable in a relatively narrow range of conditions. When these conditions are satisfied, heating profiles can be computed. While it may be possible to link several of these specialized algorithms to produce a semi-continuous description of cloud microphysical

215

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Effective Diameter in Radiation Transfer: Definition, Applications and Effective Diameter in Radiation Transfer: Definition, Applications and Limitations Mitchell, D. L., Desert Research Institute Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting Although the use of an effective radius for radiation transfer calculations in water clouds has been common for many years, the export of this concept to ice clouds has been fraught with uncertainty. A consensus appears to be building that a general definition of effective diameter, Deff, should involve the ratio of the size distribution (SD) volume (at bulk density) to projected area. This work further endorses this concept, describes its physical basis in terms of an effective photon path, and demonstrates the equivalency of a derived Deff definition for both water and ice clouds.

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Mean 3D Radiative Transfer in Cloudy Columns: Further Empirical Evidence Mean 3D Radiative Transfer in Cloudy Columns: Further Empirical Evidence for Propagation Kernels with Power-Law Tails Davis, A.B. (a), Marshak, A. (b), and Barker, H.W. (c), Los Alamos National Laboratory (a), NASA Goddard Space Flight Center (b), Meteorological Service of Canada (c) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting For reasons of computational efficiency, current radiation parameterizations in GCMs are uniformly based on analytical 2-stream solutions of the 1D integro-differential radiative transfer equation (RTE). This is true even when there is an effort to account for subgrid variability which would normally call for the full 3D RTE. Indeed, state-of-the-art GCM radiation schemes use linear combinations of clear-

217

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Combination of the Separation of Variable and the T-matrix Method for Combination of the Separation of Variable and the T-matrix Method for Computing Optical Properties of Spheroidal Particles Schulz, F.M., Eide, H.A., and Stamnes, K., University of Alaska, Fairbanks; Stamnes, J.J., University of Bergen, Norway Eighth Atmospheric Radiation Measurement (ARM) Science Team Meeting The growing interest in nonspherical particles in recent years has led to significant improvements of various light scattering models for different kinds of nonspherical particles. One approach is to model size-shape distributions of randomly oriented particles by spheroids, whose light scattering properties can be rigorously calculated with the separation of variable method (SVM). The SVM can be used to model particles with spheroidal shapes departing significantly from sphericity. In contrast, the

218

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Empirical Model of Aerosol Uplifting from the Arid Area Empirical Model of Aerosol Uplifting from the Arid Area Gorchakov, G.I., Shukurov, K.A., and Golitsyn, G.S., A.M. Obukhov Institute of Atmospheric Physics, RAS Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting The model enables to make the estimates of the vertical fluxes of arid aerosol using measured data of the wind velocity. The model includes the following main elements: 1. The parameterization of the microstructure of the aerosol uplifted from the area. 2. Relationship between wind velocity and the submicron aerosol concentration. 3. The aerosol uplifting rates. It is found that there is the synchronism of the submicron and coarse aerosol fluctuation in convective conditions at the arid area. Vertical turbulent fluxes of the aerosol were determined regarding two regimes of aerosol

219

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Combination of Temperature and Humidity Profiles from a Scanning 5-mm Combination of Temperature and Humidity Profiles from a Scanning 5-mm Radiometer and MWR-Scaled Radiosondes During the 1999 Winter NSA/AAO Radiometer Experiment Westwater, E.R.(a), Leuski, V.(a), and Racette, P.(b), CIRES, University of Colorado/NOAA-ETL (a), NASA/ Goddard Space Flight Center (b) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting A scanning 5-mm-wavelength radiometer was deployed during an Intensive Operating Periods (IOP) at the Atmospheric Radiation Measurement Program's Cloud and Radiation Testbed (CART) facilities. at the North Slope of Alaska/Adjacent Arctic Ocean site near Barrow, Alaska, during March of 1999. One goal was to evaluate the ability of an oxygen-band 5-mm microwave radiometer for measuring sharp temperature inversions that are typical

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Influence of Smoke over Haze on Heating Rate and Radiative Forcing: Influence of Smoke over Haze on Heating Rate and Radiative Forcing: Consistency of Measurements from Aircraft, Ground and Satellite Vant-Hull, B., Taubman, B.F., and Li, Z., Department of Meteorology, University of Maryland, College Park Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting On 8 July 2002, heavy and widespread smoke advected from fires in Quebec to the eastern seaboard of the US, rending an interesting aerosol scenario with strong absorbing aerosols (smoke) overlying scattering aerosols (industrial pollution). An aircraft equipped with a variety of aerosol and chemical sensors flew over five locations in Virginia and Maryland. This study evaluates the consistency of aerosol measurements made by a suite of air-borne, space-borne and ground-based instruments and evaluates the

Note: This page contains sample records for the topic "arm science team" 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

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A New Approach for Computing Single Scattering Properties of Ice Clouds A New Approach for Computing Single Scattering Properties of Ice Clouds Using a Size-Shape Distribution of Spheroidal Particles Eide, H.A., and Stamnes, K., University of Alaska, Fairbanks; Stamnes, J.J., University of Bergen, Norway; Schulz, F.M., University of Rochester Ninth Atmospheric Radiation Measurement (ARM) Science Team Meeting Clouds are of paramount importance for the global energy balance and hence for our climate. In global circulation models (GCMs), designed to predict future climate, the effects of clouds are commonly based on the scattering and absorption properties of spherical particles. At high latitudes as well as at high enough altitudes anywhere on our planet, clouds frequently consist of ice particles that are far from spherical in shape. Ice

222

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Spurious Oscillation in Simulating Boundary-Layer Cumulus Clouds with Spurious Oscillation in Simulating Boundary-Layer Cumulus Clouds with Third-Order Turbulence Closure Models Fischer, M.L.(a), Billesbach, D.P.(b), Riley, W.J.(a), Berry, J.A.(c), and Torn, M.S.(a), E.O. Lawrence Berkeley National Laboratory (a), University of Nebraska (b), Carnegie Institution of Washington (c) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting Spatial heterogeneity in the mass and energy fluxes in the Southern Great Plains are controlled by a combination of driving variables (e.g. climate, topography and soil, vegetation, and land use and management). Accurate estimation of landscape-averaged ecosystem-atmosphere exchange hence suggests the need for predictive models tested with extensive ground based measurements and/or a measurement method with regional coverage. This is

223

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Scale Analysis of Spatial and Temporal Variability of Aerosol Optical Scale Analysis of Spatial and Temporal Variability of Aerosol Optical Properties Over the SGP Site based on MFRSR and MODIS Data Alexandrov, M.D.(a,b), Marshak, A.(b), Cairns, B.(a,b), Lacis, A.A.(b), and Carlson, B.E.(b), Columbia University (a), NASA (b) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting We present scale-by-scale analysis of variability of atmospheric aerosol optical thickness (AOT) and (preliminary) of the Angstrom exponent. This analysis is based on retrievals from Multi-Filter Rotating Shadowband Radiometers (MFRSRs) and from Moderate Resolution Imaging Spectroradiometer (MODIS) satellite data. This type of analysis has been applied to a remote sensing aerosol dataset for the first time. The MFRSR data were collected

224

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Using Time-Height Cross-Sections of Cumulus Cloud Fields for Solar Using Time-Height Cross-Sections of Cumulus Cloud Fields for Solar Radiative Transfer Pincus, R.(a), Hannay, C.(a), and Evans, K.F.(b), NOAA-CIRES Climate Diagnostics Center (a), University of Colorado (b) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting How much must be known about a cloud field in order to accurately compute the reflected and transmitted flux? Given our limited abilities to measure the time-evolving three-dimensional structure of clous, and the high cost of making three-dimensional (3D) radiative transfer computations, we would like to determine the accuracy of various approximations used to convert remote sensing observations to domain averaged solar fluxes. We use highly resolved (50 m, 1 min) clouds fields from large eddy simulations of

225

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Retrieval of Cirrus Particle Sizes Using a Spit-Window Technique: A Retrieval of Cirrus Particle Sizes Using a Spit-Window Technique: A Sensitivity Study Fu, Q. (a) and Sun, W.B. (b), University of Washington (a), Dalhousie University (b) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting The 8 - 12 um atmospheric window is an important spectral region for the remote sensing of the earth-atmosphere system. Since clouds are the major regulator of the global radiative energy budget, numerous methods have been developed to detect clouds and cloud properties based on satellite observations. Among them are the split-window techniques which are particularly useful for remote sensing of cirrus clouds. Owing to the large spectral variation of ice's imaginary refractive index over the atmospheric window, one can infer the effective ice particle sizes of cirrus clouds

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Passive Remote Sensing of Aerosol Properties from Aircraft Measurements Passive Remote Sensing of Aerosol Properties from Aircraft Measurements Over the SGP Cairns, B. (a), Lacis, A.A. (b), Carlson, B.E. (b), Alexandrov, A. (a), and Barnard, J.C. (c), Columbia University (a), NASA Goddard Institute for Space Studies (b), Pacific Northwest National Laboratory (c) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting The principal difficulties in retrieving aerosol loadings and microphysical properties using passive remote sensing measurements over land surfaces are the significant spectral and spatial variations in the observed intensities that are caused by the land surface. The may also be of use in remote sensing of the surface, being indicative of its roughness, or in the case of vegetation its leaf inclination distribution. It is believed that the

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Intial Results from an Automated High Spectral Resolution Lidar Intial Results from an Automated High Spectral Resolution Lidar Eloranta, E.W., University of Wisconsin-Madison Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting An automated High Spectral Resolution Lidar constructed at the University of Wisconsin is nearly ready for an Arctic deployment. It is designed for remote operation as an Internet appliance requiring only minimal onsite attention. The system is currently installed in our roof top laboratory and is operating continuously as part of an extended shakedown test. Several months of data have been collected and archived on our web site (see arctic HSRL at "lidar.ssec.wisc.edu"). A web interface to browse and visualize data is provided along with tools to generate calibrated plots of

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The Use of Performance Metrics to Enhance Meteorological Operations The Use of Performance Metrics to Enhance Meteorological Operations Jakob, C.(a), Pincus, R.(b), Hannay, C.(b), and Xu, K.-M.(c), BMRC (a), NOAA/CIRES CDC (b), NASA Langley (c) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting It is highly desirable to use cloud radar data in the evaluation of model simulations of clouds at various scales. Unfortunately there is an inherent mismatch between the spatial and temporal scales of the models and the observations. Usually this mismatch is overcome by time-averaging the observations and declaring the averages as representative for a given model spatial scale. Here we explore an alternative method of model evaluation that is based on the interpretation of model cloud predictions as probabilistic forecasts at the observation point. First we contrast

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Narrowband, Narrow Field-of-View Fast Infrared Filter Radiometry: Future Narrowband, Narrow Field-of-View Fast Infrared Filter Radiometry: Future Operation at CART Sites and Some Aspects of Water Vapor Absorption and Emission Platt, C.M.R. (a), Bennett, J.A. (b), Petraitis, B. (b), Austin, R.T. (a), and Young, S.A. (b), Colorado State University, Fort Collins (a), CSIRO Atmospheric Research, Aspendale, Australia (b) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting An infrared filter radiometer is being installed at the SGP CART site early in 2001. The radiometer is based on a previous Mark I version that was used successfully in field experiments in tropical Australia. The radiometer has a narrow field-of-view, compatible with lidar, is fast, at one-second-time constant, and has three channels at 8.62, 10.86 and 12.12 microns. It

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The North Slope of Alaska CART and Arctic Change 2002 The North Slope of Alaska CART and Arctic Change 2002 Zak, B.D., Zirzow, J.A., and Einfeld, W., Sandia National Laboratories Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting The North Slope of Alaska/Adjacent Arctic Ocean (NSA/AAO) Cloud and Radiation Testbed (CART), operational since spring of 1998, is maturing just in time for the push to understand the far-reaching changes in the Arctic presently occurring. From the mid 1970s to the mid 1990s, arctic sea ice areal coverage has decreased about 5%, but ice thickness appears to have decreased about 40%. In addition, temperature and salinity patterns in the Arctic Ocean and the associated thermohaline circulation have been affected, as have many other climate-related processes. An Arctic

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The Impact of a Revised Treatment of Cirrus Microphysics on the Radiation The Impact of a Revised Treatment of Cirrus Microphysics on the Radiation Budget of the Unified Model Edwards, J.M. (a), Mitchell, D.L. (b), Ivanova, D. (b), and Wilson, D.R. (a), Met Office, Hadley Centre for Climate Prediction and Research (a), Desert Research Institute (b) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting The Unified Model is used for both NWP and climate simulations at the Met Office. A parametrization of ice crystals as planar polycrystals was recently introduced into the climate and mesoscale NWP versions of this model, resulting in improvements to the radiation budget and a reduction in the upper tropospheric cold bias. Based on field observations, the size distribution is taken as bimodal and is characterized by a mean maximum

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Uncertainties in the Line Intensities in the 1130 nm Band of Water Vapor Uncertainties in the Line Intensities in the 1130 nm Band of Water Vapor Giver, L.P. (a), Pilewskie, P. (a), Gore, W.J. (a), Chackerian, Jr., C. (b), Varanasi, P. (c), Freedman, R.S. (d), and Bergstrom, R. (e), NASA-Ames Research Center (a), SETI Institute (b), State University of New York at Stony Brook (c), Space Physics Research Institute (d), Bay Area Environmental Research Insitute (e) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting Belmiloud et al (GRL 27, 3703-3706 (2000)) have recently asserted that the line intensities in the 1130 nm band of water vapor band listed in the HITRAN database are much too weak. Giver et al (JQSRT 66, 101-105(2000)) pointed unit-conversion errors out in the intensity data previously appearing in the HITRAN database and corrected the intensity data so that

233

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Evaluation of Remote Sensing of the Single Scattering Albedo of Aerosols Evaluation of Remote Sensing of the Single Scattering Albedo of Aerosols During the Aerosol IOP Cairns, B.(a), Gianelli, S.M.(a), Carlson, B.E.(b), and Lacis, A.A.(b), Columbia University (a), NASA GISS (b) Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting It has long been known that diffuse sky radiance and irradiance measurements are sensitive to the single scattering albedo of aerosols. The main difficulties in exploiting this sensitivity to try and remotely estimate the single scattering albedo of aerosols are uncertainties in the albedo and bidirectional reflectance distribution function of the surface and uncertainties in the calibration of the instruments used to make the measurements. The surface albedo measurements that are currently being

234

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Evaluation of a Bulk Cloud Microphysics Model in Simulating Low-Level Evaluation of a Bulk Cloud Microphysics Model in Simulating Low-Level Arctic Mixed-Phase Clouds Using a New Single-Column Model Morison, H., Curry, J.A., and Mirocha, J., University of Colorado Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting The MM5 NCAR/Penn State mixed-phase bulk microphysical parameterization is evaluated using a new single column model (ARCSCM) in the context of arctic low-level mixed-phase clouds. ARCSCM is developed from the Arctic Regional Climate System Model (ARCSyM). Three mixed-phase clouds over SHEBA in May 1998 are simulated using the MM5 parameterization. Liquid water path (LWP) is underpredicted by ~ 75% compared to observations for the two cases that have a significant ice content, while LWP is accurately predicted (within

235

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Case Studies of Water Vapor Variability During the International H20 Case Studies of Water Vapor Variability During the International H20 Project 2002 Using GPS Braun, J., Rocken, C., and Kuo, Y.H., UCAR/COSMIC Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting The International H20 Project 2002 (IHOP_2002) was a field experiment located in the United States Southern Great Plains whose primary objective was to improve warm season rainfall prediction through the collection of precise observations of the water cycle and their assimilation into numerical weather models. As part of a wide range of observing systems, more than 40 Global Positioning System (GPS) stations were operating in the experiment region during IHOP_2002. We present an analysis of the evolution of the water vapor field for significant storms that were captured by the

236

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The Parameterization of Shallow Cumulus Convection The Parameterization of Shallow Cumulus Convection Zhu, P. and Albrecht, B.A., University of Miami Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting A successful representation of shallow cumulus convection in GCMs requires two parameterizations: one for calculating the subgrid fluxes of heat, moisture, and momentum; and the other for estimating the cloud cover and the associated cloud liquid water. Two common schemes used for these two parameterizations are the mass flux approach and the distribution approach such as SDM's (Sommeria, Deardorff, and Mellor) scheme, respectively. In this study, we verified the assumptions that lead to these schemes using LES data. The analyses indicate that the assumptions may not be appropriate for shallow cumulus convections, especially those over land when diurnal

237

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Dust-Climate Interactions: A Conceptual Model Dust-Climate Interactions: A Conceptual Model Shell, K. M. and Somerville, R. C. J., Scripps Institution of Oceanography, University of California, San Diego Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting Paleoclimatic evidence strongly suggests that airborne mineral dust can be a climatically important atmospheric aerosol, but little is known quantitatively about the mechanisms of dust-climate interactions. We have developed a conceptual global model with which to study processes and feedbacks within the dust-climate system. We solve numerically for equilibrium climate states defined by temperature as a function of latitude. Our zonally averaged model includes both an atmosphere and a surface that becomes ice-covered at sufficiently low temperatures. We

238

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Intraseasonal Variation Observed from Multi-Infrared Channel Intraseasonal Variation Observed from Multi-Infrared Channel Inoue, T., Meteorological Research Institute Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting Intraseasonal variations (MJO) of convective cloud, sea surface temperature (SST) and water vapor information are studied using three infrared channels (6.7, 11, 12 um). Split window(11 and 12 um) can classify optically thin ice cloud and optically thick cloud. Further SST and water vapor information can be retrieved from the split window over the cloud free region. We can estimate upper level relative humidity from the 6.7 um data. Composite analysis of cloud type associated with the intraseasonal variation during May 1998 showed the horse shoe shape deep convective cloud area near the center of the MJO, cirrus type cloud area to the west of the

239

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Solar Radiative Influences on Drop Growth Solar Radiative Influences on Drop Growth Harrington, J.Y, Hartman, C., and Verlinde, J., The Pennsylvania State University Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting The offsetting effects of solar heating and infrared cooling on the vapor-depositional growth of cloud droplets is investigated. In this study, a marine stratocumulus cloud was simulated by using a large eddy simulation (LES) model and a detailed microphysical bin model. Including infrared cooling as well as solar heating had two effects. The first effect is related to the fact that vapor-depositional growth of drops is radius dependent - solar heating effects dominated at larger drop sizes (> 100 microns) and infrared cooling effects dominated at smaller drop sizes

240

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Inferring Optical Depth of Broken Clouds above Green Vegetation. Part Inferring Optical Depth of Broken Clouds above Green Vegetation. Part I:Methodology for Surface- and Aircraft-based Observations Barker, H.W. (a), Marshak, A. (b), Pavloski C.F. (c), and Clothiaux E.E.(c), Environment Canada (a), UMBC/JCET (b), The Pennsylvania State University (c) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting A method for inferring cloud optical depth is introduced and assessed using simulated radiometric measurements produced by a 3D Monte Carlo algorithm acting on fields of broken, single-layer, boundary layer clouds. These fields contain numerous small cumuli and broken stratiform clouds and represent demanding tests. The method, which resembles the Normalized Difference Cloud Index, utilizes the DISORT radiative transfer model and

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241

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Water Vapor Profiling During WVIOP#3 and AFWEX2000 Using Ground-Based Water Vapor Profiling During WVIOP#3 and AFWEX2000 Using Ground-Based Differential Absorption Lidar Boesenberg, J. (a), Linne, H. (a), Jansen, F. (a), Ertel, K. (a), Lammert, A. (a), and Wilkerson, T. (b), Max-Planck-Institut fuer Meteorologie, Hamburg (a), Utah State Univerity (b) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting The differential absorption lidar (DIAL) system of the MPI participated in both the WVIOP#3 and AFWEX2000 experiments. It was operated on 11 days during each experiment for periods up to 12 hours per day. The time slot for these measurements was 12 noon to 2am due to FAA restrictions. The measurements were focussed on the day-night-transition and the following hours during WVIOP#3 and on LASE overflights during AFWEX. The MPI DIAL

242

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Importance and Parameterization of Longwave Radiative Scattering by Mineral Importance and Parameterization of Longwave Radiative Scattering by Mineral Aerosols Gautier, C., Dufresne, J.-L., and Ricchiazzi, P.J., University of California Santa Barbara Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting The effect of scattering is not always included in longwave models of radiative forcing due to mineral aerosols. In this presentation, we quantify and highlight the importance of scattering in the longwave domain for a wide range of conditions commonly encountered during dust events. We show that the neglect of scattering may lead to an underestimate of longwave aerosol forcing. This underestimate may reach 50% of the forcing at the top of atmosphere and 15% at the surface for aerosol effective radius greater than a few tenths of a micron. In contrast, the heating rate

243

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Comparisons Between Measured and Modeled Longwave Irradiances During Arctic Comparisons Between Measured and Modeled Longwave Irradiances During Arctic Winter: Results from the Second International Pyrgeometer and Absolute Sky-Scanning Radiometer Comparison (IPARSC-II) Marty, Ch.(a), Storvold, R.(a), Philipona, R.(b), Delamere, J.(c), Dutton, E.(d), Michalsky, J.(e), Stamnes, K.(f), Eide, H.(f), and Stoffel, T.(g), Geophysical Institute, University of Alaska Fairbanks (a), World Radiation Center, Davos, Switzerland (b), Atmospheric and Environmental Research, Boston (c), Climate Monitoring and Diagnostics Laboratory NOAA, Boulder (d), State University of New York at Albany (e), Stevens Institute of Technology, Hoboken, New Jersey (f), National Renewable Energy Laboratory, Golden (g) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting

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AERI-Lidar Retrievals of Ice Cloud Physical Properties, Including the First AERI-Lidar Retrievals of Ice Cloud Physical Properties, Including the First Estimates of Photon Tunneling Contributions to Absorption Mitchell, D.L.(a) and DeSlover, D.H.(b), Desert Research Institute (a), Cooperative Institute for Meteorological Satellite Studies, University of Wisconsin (b) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting The Atmospheric Emitted Radiance Interferometer (AERI) and the High Spectral Resolution Lidar (HSRL) have been used to determine the spectral dependence of alpha in the window region (8.5-12.5 micron wavelength), where alpha is the ratio of optical depth at a visible wavelength to infrared absorption optical depth for a cirrus cloud. Using alpha and cloud emissivity measurements, it is generally possible to retrieve effective

245

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Links Between Mesoscale Dynamics and Cloud Water in High-Resolution March Links Between Mesoscale Dynamics and Cloud Water in High-Resolution March 2000 RAMS Simulations Weaver, C.P.(a), Gordon, N.D.(b), Norris, J.R.(b), and Klein, S.A.(d), Rutgers University (a), Scripps Institution of Oceanography (b), NOAA/GFDL (c) Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting The Regional Atmospheric Modeling System (RAMS) is applied as a tool for improving our understanding of sub-GCM-grid-scale cloudiness. Specifically, we use high-resolution simulations of March 2000 IOP days to identify the important mesoscale dynamic and thermodynamic controls on cloud water distributions. The resolution dependence of the simulated results is also investigated as a way to identify potential deficiencies in coarser-resolution models, such as GCMs. The main finding from the

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ERBE OLR and Cloud Type by Split Window ERBE OLR and Cloud Type by Split Window Inoue, T.(a) and Ackerman, S.A.(b), Meteorological Research Institute (a), University of Wisconsin (b) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting Using collocated ERBE and split window/AVHRR on board NOAA-9, we studied the relationship between cloud type and OLR. NOAA operational OLR estimation is based on flux equivalent temperature defined by the narrow band TBB. We found the relationship between ERBE OLR and brightness temperature (TBB) was different depending on cloud type classified by the split window. The brightness temperature difference between the split window (BTD) is a good indicator of water vapor amount and cloud optical properties. Therefore, we use the TBB and BTD to determine the regression

247

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Implementing Flexible Cloud Vertical Structure in GFDL's AM-2 Large-Scale Implementing Flexible Cloud Vertical Structure in GFDL's AM-2 Large-Scale Model Using Stochastic Clouds Pincus, R.(a), Klein, S.A.(b), and Hemmler, R.(b), NOAA-CIRES Climate DiagnosticsCenter (a), Geophysical Fluid Dynamics Laboratory (b) Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting Cloud vertical structure has a significant impact on radiation and precipitation fluxes, which can then feed back to the general circulation. In large-scale models with partial cloudiness in each grid cell, this structure is usually imposed in the form of "overlap assumptions," which are typically implemented separately in the radiation and precipitation codes. To date, GFDL's global atmospheric model AM-2 has used the random overlap assumption, which is easy to implement but known to be unrealistic

248

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Aerosol-Cloud-Radiation Interaction: A Comparison of GCM Results versus Aerosol-Cloud-Radiation Interaction: A Comparison of GCM Results versus Surface Observations Liepert, B.G., Lamont-Doherty Earth Observatory of Columbia University; Lohmann, U., Dalhousie University, Halifax, Canada Ninth Atmospheric Radiation Measurement (ARM) Science Team Meeting The change in cloud properties due to increased anthropogenic emissions of aerosols and their precursor gases is referred to as "indirect aerosol effect." Estimates with general circulation models (GCMs) assumed that an increase in aerosol concentration would lead to a cooling effect of about -1Wm2. To evaluate the anthropogenic indirect aerosol effect, we compared two ECHAM GCM experiments with long-term surface observations covering the United States and Germany. The model prognosticates the number of cloud

249

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Terminal Velocities of Droplets and Crystals: Power Laws with Continuous Terminal Velocities of Droplets and Crystals: Power Laws with Continuous Parameters Over the Size Spectrum Khvorostyanov, V.I. and Curry, J.A., University of Colorado Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting This paper presents a unified treatment of cloud particle fall velocities Vt for both liquid and crystalline cloud particles over the entire size range observed in the atmosphere. The fall velocity representation is formulated in terms of the Best (or Davies) number X and the Reynolds number Re. For the power law representations used in many applications, and with D being the particle diameter (or maximum length), the coefficients aRe, bRe, av, bRe are found as the continuous analytical functions of X or D over the entire hydrometeors size range. Analytical asymptotic solutions

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An Analytic Solution of Two-Stream Stochastic Radiative Transfer in An Analytic Solution of Two-Stream Stochastic Radiative Transfer in Spatially Correlated Media Hu, Y.X.(a) and Davis, A.B.(b), NASA Langley Research Center (a), Los Alamos National Laboratory (b) Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting In situ cloud microphysics measurements show spatial auto-correlations of extinction cross sections over a wide range of scales. At some of those scales, homogeneity and independent-column assumptions fail and a three-dimensional treatment of the radiative transfer is required to capture the effect of the correlations. A simple differential form of transport equation is developed for correlated media in order to account for the first-order impact of the spatial auto-correlations. Two-stream

251

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Optical and Microphysical Characteristics of the Smoke Aerosol in the Optical and Microphysical Characteristics of the Smoke Aerosol in the Moscow Region During the Summer-Autumn of 2002 Gorchakov, G.I.(a), Golitsyn, G.S.(a), Anikin, P.P.(a), Emilenko, A.S.(a), Isakov, A.A. (a), Kopeikin, V.M.(a), Rublev, A.N.(b), Sviridenkov, M.A.(a), and Shukurov, K.A.(a), A.M.Obukhov Institute of Atmospheric Physics, RAS (a), Russian Research Center "Kurchatov Institute" (b) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting Observational results will be presented for the optical and microphysical characteristics of the smoke aerosol produced by wild fires at peatbogs in the Moscow region during the July-September of 2002. Characteristics in the visual range and mass concentration of the submicron aerosol had been

252

ARM - Publications: Science Team Meeting Documents  

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Aerosol Absorption, Optical Depth and Vertical Extent Estimates Using Aerosol Absorption, Optical Depth and Vertical Extent Estimates Using UV/blue Satellite Measurements Cairns, B., and Alexandrov, M.D., Columbia University; Carlson, B.E., and Lacis, A.A., NASA Goddard Institute for Space Studies Eighth Atmospheric Radiation Measurement (ARM) Science Team Meeting The radiative balance of the atmosphere and the climatological response of the atmospheric circulation to changes in aerosol loading is principally determined by the vertical extent and single-scatter albedo of the aerosols. Although UV radiance measurements made by the Total Ozone Mapping Experiment Spectrometer (TOMS) instrument have been used to detect UV absorbing aerosols and estimate their properties, the unknown verticalextent of the aerosol affects the sensitivity of the radiances to

253

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Inferring Cloud Optical Depth Using Spectrally Varying Surface Albedo: Inferring Cloud Optical Depth Using Spectrally Varying Surface Albedo: Frozen Turbulence vs. Time Evolution Barker, H.W.(a), Pavloski, C.F.(b), Ovtchinnikov, M.(c), Kassianov, E.(c), Clothiaux, E.E.(b), and Marshak, A.(d), Meteorological Service of Canada (a), The Pennsylvania State University (b), Pacific Northwest National Laboratory (c), UMBC/NASA-GSFC (d) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting Barker and Marshak (2001) proposed a method for inferring cloud optical depth from measurements of surface spectral radiance and irradiance made close to, but on either side of, wavelength 700 nm (approximately where absorption by chlorophyll ends). Their method has been tested by applying a Monte Carlo photon transport algorithm to cloud fields simulated by

254

ARM - Publications: Science Team Meeting Documents  

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A First Look at the Radiative Impact of Tropical Cirrus Systems Encountered A First Look at the Radiative Impact of Tropical Cirrus Systems Encountered During CRYSTAL-FACE Pilewskie, P. (a), Gore, W. (a), Rabbette, M. (b), Howard, S. (b), and Pommier, J. (b), NASA Ames Research Center (a), Bay Area Environmental Research Institute (b) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting During the 2002 CRYSTAL-FACE experiment we deployed identical solar spectral and broad-band infrared sensors on the ER-2 and CIRPAS Twin Otter in order to characterize the column radiative energy budget in the tropical atmosphere under varying conditions such as thick anvil cirrus, thin sub-visible cirrus, and cloud free conditions. The data are used to determine cirrus and clear sky heating and cooling rates. The solar spectral reflectance and transmittance data are used to infer cloud

255

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Cloud Radiative Forcing of the Arctic Surface: The Influence of Cloud Cloud Radiative Forcing of the Arctic Surface: The Influence of Cloud Properties, Surface Albedo, and Solar Zenith Angle Shupe, M.D. and Intrieri, J.M., NOAA - Environmental Technology Laboratory Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting An annual cycle of cloud and radiation measurements made as part of the Surface Heat Budget of the Arctic program are utilized to determine which properties of Arctic clouds control the surface radiation balance. Surface cloud radiative forcing (CF), defined as the difference between the all-sky net surface radiative flux and the clear sky net surface flux, was calculated from measurements of broadband fluxes and results from a clear sky model. Longwave cloud forcing (CFLW) is shown to be a function of cloud

256

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Inferring Cloud Properties from Narrow-Field-of-View Spectral Radiometers Inferring Cloud Properties from Narrow-Field-of-View Spectral Radiometers Marshak, A.(a), Knyazikhin, Y.(b), Evans, K.(c), and Wiscombe, W.(a), NASA/GSFC (a), Boston University (b), UMBC/JCET (c) Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting The most common approach for retrieving cloud optical depth from ground-based observations uses downwelling fluxes measured by pyranometers and Multi-Filter Rotating Shadowband Radiometers (MFRSR). The key element in both retrieval techniques is the one-to-one mapping of the "observed" fluxes into cloud optical depth through plane-parallel radiative transfer. Both methods are expected to work well only for completely overcast clouds giving an effective optical depth for the whole sky. To infer cloud optical

257

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Diurnal Cycle of Convection, Clouds, and Water Vapor in the Tropical Diurnal Cycle of Convection, Clouds, and Water Vapor in the Tropical Upper Troposphere Soden, B.J., NOAA/GFDL Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting The presence of large diurnal variations in convection over the tropics is well documented. The amplitude of the diurnal cycle is typically largest over land areas, but important variations are also observed over oceans. Precipitation, for example, generally peaks in the early evening over tropical land regions and in the early morning over oceans. Such land/ ocean phase differences have been the topic of considerable research and debate. Many of the most widely studied diurnal variations, such as precipitation, cloud cover, and outgoing longwave radiation, are directly associated with the atmospheric hydrologic cycle. Given its obvious role in

258

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Impact of Clouds on the Atmospheric Absorption of SW - Comparing Theory and Impact of Clouds on the Atmospheric Absorption of SW - Comparing Theory and Observation at SGP Rose, F.G. (a), Charlock, T.P. (b), and Rutan, D.A. (a), Analytical Services & Materials Inc. (a), NASA Langley Research Center (b) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting This group, and also Li and Trishchenko, have earlier determined the cloud forcing to the atmospheric absorption of SW by combining surface data at SGP with CERES at TOA. Detailed analysis of our results show a systematic trend in the difference of all-sky and clear-sky atmospheric absorption with cosSZA: All-sky absorbs significantly more than clear-sky as cosSZA increases. From radiative transfer theory, all-sky absorption of SW is expected to be greater (less) than clear sky absoption when clouds are low

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A Subgrid Representation of Precipitating Marine Boundary Layer Clouds A Subgrid Representation of Precipitating Marine Boundary Layer Clouds Leung, L.R., and Ghan, S.J., Pacific Northwest National Laboratory; Feingold, G., Cooperative Institute for Research in the Atmosphere, Colorado State University Ninth Atmospheric Radiation Measurement (ARM) Science Team Meeting A subgrid parameterization is being developed to account for subgrid variations of precipitating marine stratocumulus clouds in general circulation models (GCMs). The method assumes an idealized form for the probability density function (pdf) for the cloud variables and predicts/diagnoses the parameters describing the pdfs. A level 2.5 turbulence closure model is used to calculate turbulence fluxes. Cloud-water-related turbulence fluxes are estimated using a partial

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Relationships Among Tropical Cloud Characteristics and Components of the Relationships Among Tropical Cloud Characteristics and Components of the Surface Heat Budget Curry, J.A., and Webster, P.J., University of Colorado; Clayson, C.A., Purdue University Eighth Atmospheric Radiation Measurement (ARM) Science Team Meeting Satellite data obtained during the TOGA COARE Intensive Observation Period (IOP) has been used to create a high resolution dataset (50 km, 3 hrs) of cloud characteristics (phase, height, precipitation) and components of the surface energy budget (radiation, sensible and latent heat fluxes). The satellite dataset has been evaluated using in situ observations obtained during TOGA COARE. A cloud classification scheme based upon cloud top height, phase, and precipitation is used as a framework to interpret the effect of the different cloud types on the component surface fluxes and

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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

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Radiation Parameterization for Three-Dimensional Inhomogeneous Cirrus Radiation Parameterization for Three-Dimensional Inhomogeneous Cirrus Clouds: Application to Climate Models Gu, Y. and Liou, K.N., University of California, Los Angeles Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting A three-dimensional (3D) radiative transfer model has been developed to simulate the transfer of solar and thermal infrared radiation in inhomogeneous cirrus clouds. The model utilizes a diffusion approximation approach (four-term expansion in the intensity) for application to inhomogeneous media employing Cartesian coordinates. The extinction coefficient, single-scattering albedo, and asymmetry factor are functions of spatial position and wavelength and are parameterized in terms of the ice water content and mean effective ice crystal size. We employ the

262

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Cirrus Cloud Particle Mass and Terminal Velocity Derived from Airborne 2D-C Cirrus Cloud Particle Mass and Terminal Velocity Derived from Airborne 2D-C Probe and Counterflow Virtural Impactor Data for Selected Cases During the Spring 2000 Cloud IOP Benson-Troth, S.(a), Mace, G.G.(a), Twohy, C.(b), and Poellot, M.(c), University of Utah (a), Oregon State University (b), University of North Dakota (c) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting When cirrus cloud particles are sampled by an airborne 2D-C probe, the shadows of the particles on the diode array are preserved. Analysis of the raw 2D-C data provides a size distribution and number concentration of the cloud particles sampled. The airborne counterflow virtural impactor provides the ice water content of the sampled cloud particles. Using the size distribution and the ice water content, we derive the coefficient and

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Influence of Age-Dependent Optical and Thermal Snow Properties on the Influence of Age-Dependent Optical and Thermal Snow Properties on the Modeled Surface Temperature and Albedo in the Arctic Curry, J.A., and Schramm, J.L., University of Colorado Eighth Atmospheric Radiation Measurement (ARM) Science Team Meeting A new multi-level snow model has been developed to simulate the time-varying snow thermal and optical characteristics in response to precipitation events and snow aging. The model is forced by observations from the Russian ice islands in the Arctic Ocean, and also using some preliminary data from SHEBA. A comparison of the modeled surface temperature and albedo with the commonly used 0-level snow model is made. The new model shows much better agreement with time-series observations of surface temperature and albedo. When the snow model is used over a sea ice

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Aircraft Measurements of Spectral and Broadband Shortwave Albedo from the Aircraft Measurements of Spectral and Broadband Shortwave Albedo from the NASA Langley OV-10 Smith, W.L., Jr.(a), Charlock, T.P.(a), Roback, V.E.(a), Rutledge, C.K.(b), and Zhang, T.P.(b), NASA Langley Research Center (a), Analytical Services and Materials, Inc. (b) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting In order to validate and improve surface radiative fluxes derived as part of the Clouds and the Earth's Radiant Energy System (CERES) program, The CERES Fixed-wing Airborne Radiometer (CFAR) was developed to make measurements of upwelling and downwelling shortwave (spectral and broadband) and longwave (broadband) radiative fluxes. The CFAR consists of an OV-10A Bronco twin-turboprop, originally developed for military applications but chosen by NASA for atmospheric radiation measurements

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Atmospheric Longwave Irradiance Uncertainty Atmospheric Longwave Irradiance Uncertainty Philipona, R. (a), Dutton, E.G. (b), Wood, N. (b), Anderson, G. (b), Stoffel, T. (c), Reda, I. (c), Michalsky, J.J. (d), Wendling, P. (e), Stiffter, A. (e), Clough, S.A. (f), Mlawer, E.J. (f), Revercomb, H. (g), and Shippert, T. (h), World Radiation Center, Davos, Switzerland (a), NOAA, Climate Monitoring and Diagnosic Laboratory (b), National Renewable Energy Laboratory (c), State University of New York at Albany (d), DLR, Oberfaffenhofen, Germany (e), Atmospheric and Environmental Research Inc. (f), University of Wisconsin-Madison (g), Pacific Northwest National Laboratory (h) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting The first International Pyrgeometer and Absolute Sky-scanning Radiometer

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ARM - Publications: Science Team Meeting Documents  

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Detection of Thin Cirrus Using MODIS 1.38 Micron Reflection Detection of Thin Cirrus Using MODIS 1.38 Micron Reflection Roskovensky, J.K. and Liou, K.N., University of California, Los Angeles Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting The 1.38 µm channel on board MODIS may have significant advantage in detecting thin cirrus over existing methods due to its high sensitivity to upper tropospheric clouds and a nearly negligible sensitivity to low level reflectance. To investigate this potential, three different cloud schemes are employed. One based on the MODIS Cloud Mask Product (MOD35) which utilizes both visible and 1.38 µm reflectance thresholds. The second is a modified version of the cloud phase detection scheme presented in the paper by Ou et al (1996) that incorporates a series of visible, near and far

267

ARM - Publications: Science Team Meeting Documents  

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Seasonal Variability in Cloud Cover, Cloud Base Height, and Cloud Liquid Seasonal Variability in Cloud Cover, Cloud Base Height, and Cloud Liquid Water Content at the North Slope of Alaska and the Adjacent Arctic Ocean Storvold, R. (a), Stamnes, K. (b), Marty, C. (a), and Zak, B.D. (c), University of Alaska Fairbanks (a), Stevens Institute of Technology (b), Sandia National Laboratories (c) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting There is great seasonal variability in cloud cover, cloud base height, and cloud liquid water in the Arctic. This seasonal variability in cloud properties has been quantified based on a full year of data from the Atmospheric Radiation Measurement Program Sites in Barrow and Atqasuk during 1999-2000. We compare these results with similar results obtained in the Arctic Ocean during the one-year SHEBA experiment. We also compare the

268

ARM - Publications: Science Team Meeting Documents  

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Tropical Cloud Radiative Forcing and the Large-Scale Atmospheric Energy Tropical Cloud Radiative Forcing and the Large-Scale Atmospheric Energy Transport Tian, B. (a) and Ramanathan, V. (b), Scripps Institution of Oceanography, UCSD Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting Moist static energy is exported within the atmosphere column, from equatorial latitudes to the subtropics by the Hadley circulation and from the western Pacific warm pool to the eastern Pacific cold tongue by the Walker circulation. It is the net energy fluxes into the atmosphere, i.e., the radiative and the turbulent latent and sensible heat fluxes from surface and the radiative flux at the top of the atmosphere, that maintain this energy transport and balance the resulting divergence of energy. We demonstrate here that the dominant term that provides the balance is the

269

ARM - Publications: Science Team Meeting Documents  

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Comparison of Cloud-Radiative Properties from Regional Very-High-Resolution Comparison of Cloud-Radiative Properties from Regional Very-High-Resolution Modeling and Satellite Retrievals Wang, D.-H. (a,b) and Minnis, P.(b), Hampton University (a), NASA Langley Research Center (b) Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting Data from a regional very-high-resolution modeling/assimilation and the GOES satellite-derived cloud-radiative properties including cloud fraction, temperature, height, thickness, phase, optical depth, effective particle size and ice or liquid water path; and TOA fluxes and albedos, are used in this study. The preliminary results of the intercomparison show that the cloud fields from model and satellite-derived compare well. The frequencies are computed for the individual cloud system. Comparisons of frequency

270

ARM - Publications: Science Team Meeting Documents  

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Differences in Cloud Characteristics at Barrow and Atqasuk at the NSA/AAO Differences in Cloud Characteristics at Barrow and Atqasuk at the NSA/AAO CART Doran, J.C., Barnard, J.C., Zhong, S., and Jakob, C., Pacific Northwest National Laboratory Pacific Northwest National Laboratory, European Centre for Medium-Range Weather Forecasting Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting Data obtained from multifilter rotating shadowband radiometers (MFRSRs) and microwave radiometers (MWRs) have been used to examine the differences in the cloud characteristics at Barrow and Atqasuk during the period June-September of 1999. Because the size of a grid cell in a GCM may be on the order of 100 km or more, it is important to determine to what extent meteorological and radiometric observations made at Barrow or Atqasuk

271

ARM - Publications: Science Team Meeting Documents  

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Particle Size Distributions Estimated During the 2001 Multi-Frequency Radar Particle Size Distributions Estimated During the 2001 Multi-Frequency Radar IOP Williams, C.R.(a) and Sekelsky, S.M.(b), University of Colorado at Boulder (a), University of Massachusetts at Amherst (b) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting The 2001 Multi-Frequency Radar Intensive Operational Period (IOP) was designed to collect a long dataset of W-band (95 GHz), Ka-band (35 GHz), and S-band (2.8 GHz) vertical profiling observations to investigate insect scattering and precipitating particle scattering above the Southern Great Plains (SGP) Cloud and Radiation Testbed (CART) site. The 95 and 2.8 GHz vertically pointing radars were placed next to the permanently installed 35 GHz Millimeter Wave Cloud Radar (MMCR) at the SGP Central Facility from

272

ARM - Publications: Science Team Meeting Documents  

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Parameterization of Hygroscopic Aerosols in a Climate GCM Parameterization of Hygroscopic Aerosols in a Climate GCM Lacis, A.A., Mishchenko, M.I., and Carlson, B.E., Goddard Institute for Space Studies Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting Real and imaginary refractive indices are needed over the full range of solar and thermal wavelengths in order to compute the radiative forcing due to atmospheric aerosols. Laboratory measurements are available for dry ammonium sulfate [Toon and Pollack, 1976] over the spectral range 0.3 – 40 ?m, and for dry sea salt [Shettle and Fenn, 1979; Nilsson, 1979; both based on Volz, 1972 measurements] over 0.2 – 40 ?m. Partial spectrum measurements from 0.7 to 2.6 ?m of the imaginary refractive index of ammonium sulfate and ammonium nitrate are also available [Gosse et al.,

273

ARM - Publications: Science Team Meeting Documents  

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Radiative Forcing of Arctic Boundary Layers During SHEBA Radiative Forcing of Arctic Boundary Layers During SHEBA Pinto, J.O., Mirocha, J., Reeder, R.A., and Curry, J.A., University of Colorado Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting Field measurements obtained during the Surface Heat Budget of the Arctic (SHEBA) experiment are used to ascertain the importance of radiation in the evolution of the Arctic boundary layer. Radiation effects the boundary layer structure through the vertical flux divergence of longwave and shortwave fluxes as well as through radiative heating/cooling of the surface which determines the sensible heat flux. The mean and turbulence structure of the both clear and cloud boundary layers in winter, spring and summer are determined from aircraft data, radiosonde soundings, the ASFG

274

ARM - Publications: Science Team Meeting Documents  

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Cloud Layer Thickness and Temperature Vernon, E.N.(a) and Mace, G.G.(b), University of Utah (a), University of Utah (b) Twelfth Atmospheric Radiation Measurement (ARM) Science...

275

ARM - Publications: Science Team Meeting Documents  

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Aerosol Direct Forcing at TOA and Surface for Clear and Cloudy Conditions Aerosol Direct Forcing at TOA and Surface for Clear and Cloudy Conditions Charlock, T.P.(a), Rose, F.G.(b), Rutan, D.A.(b), Fillmore, D.(c), and Collins, W.(c), NASA Langley Research Center (a), Analytical Services and Materials, Inc. (b), National Center for Atmospheric Research (c) Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting Direct aerosol forcing can be affected dramatically by cloudiness. For example, with a continental AOT of 0.25 and soot AOT of 0.05 at scale height 2km over the tropical ocean with cosSZA of 0.33, the computed forcing to SW reflection at TOA is 15 Wm-2. If we include a boundary layer cloud with a top at 1km and an optical depth 20, the same TOA forcing then reverses sign and becomes -22 Wm-2. A new CERES Terra Surface and

276

ARM - Publications: Science Team Meeting Documents  

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The entire year 2000 at SGP is planned to be processed by the time of the time of the Science Team Meeting, and results from these runs will be presented. This version should...

277

ARM - Publications: Science Team Meeting Documents: Update on the ARM  

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Update on the ARM SCM/CRM multi-year continuous forcing datasets at SGP Update on the ARM SCM/CRM multi-year continuous forcing datasets at SGP Xie, Shaocheng Lawrence Livermore National Laboratory Yio, John DOE/Lawrence Livermore National Laboratory Klein, Stephen Lawrence Livermore National Laboratory Cederwall, Richard Lawrence Livermore National Laboratory Statistical study of SCM/CRM simulations requires a long-term (preferably, multiyear) large-scale forcing data. The current approach to develop such multiyear datasets at SGP is to use the NOAA mesoscale model RUC (Rapid Update Cycle) analyses constrained with the ARM surface and TOA measurements by using a variational analysis approach. Using this method, the LLNL ARM data infrastructure team developed a 2-year continuous forcing dataset for 1999-2000 two years ago. Since then, several ARM surface and

278

ARM - Publications: Science Team Meeting Documents: Publication...  

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Publication Trends of ARM Research Troyan, David Brookhaven National Laboratory This study summarizes the publication record of ARM research. Items of all types listed in the ARM...

279

ARM - Publications: Science Team Meeting Documents: Using ARM data to  

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Using ARM data to evaluate the dependence of surface downward longwave Using ARM data to evaluate the dependence of surface downward longwave radiation on near-surface temperature and water vapour path, in both ARM observations and the Met Office NWP model. Henderson, Peter Environmental Systems Science Centre Slingo, Anthony Environmental Systems Science Centre In this work, we continue our comparisons between ARM data and simulations from the UK Met Office Numerical Weather Prediction (NWP) model. The present analysis focuses on the variables that control the downwelling longwave radiation at the surface, in particular the column water vapour and near-surface temperature. Water vapour is both a source and a sink of latent heat, is an active modulator of atmospheric radiative transfer and therefore influences both the general circulation and the global energy

280

ARM - Publications: Science Team Meeting Documents  

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Mining the ARM Data Set: A WWW-Staged Prototype Relational Database of ARM Data Mace, G.G. and Hudach, D.P., University of Utah Twelfth Atmospheric Radiation Measurement (ARM)...

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281

ARM - Publications: Science Team Meeting Documents  

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of Global Climate Models Using ARM Data Stephens, G.L., Gabriel, P., and Wood, N.B., Colorado State University Twelfth Atmospheric Radiation Measurement (ARM)...

282

ARM - Publications: Science Team Meeting Documents  

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overlap in order to improve the general circulation models used to produce climate forecasts. The long term meteorological data gathered by the DOE ARM program offers a unique...

283

ARM - Selected Science Team Proposals - FY 1998  

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of the ARM Data Stream" Dr. Joseph Michalsky and Dr. Lee Harrison, State University of New York, Albany: "Spectral and Broadband Shortwave Radiometry and Analysis" Dr. David A....

284

ARM - Publications: Science Team Meeting Documents  

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designed to facilitate intercomparison of ARM data with the satellite data and include thermodynamic profiles, millmeter radar data, microwave radiometer data, surface...

285

ARM - Publications: Science Team Meeting Documents  

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Optical Remote Sensing Research at Montana State University Shaw, J.A., Repasky, K., and Carlsten, J.A., Montana State University Thirteenth Atmospheric Radiation Measurement (ARM)...

286

ARM - Selected Science Team Proposals - FY 1997  

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Radiation Measurement (ARM) Program" Dr. Joseph Michalsky, Jr., State University of New York: "Spectral and Broadband Rotating Shadowband Shortwave Radiometry and Analysis"...

287

ARM - Publications: Science Team Meeting Documents  

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Subgrid-Scale Vertical Transport of Moisture and Energy Over the ARM SGP: Analysis of Measurements and Parameterizations in Cumulus Convection Schemes Zhang, M.H., State University...

288

ARM - Publications: Science Team Meeting Documents  

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Satellite Determination of Large-Scale Ice Water Path Distribution During ARM IOPs Liu, G. and Zuiderweg, A., Florida State University Large-scale horizontal distribution and...

289

ARM - Publications: Science Team Meeting Documents: Investigation...  

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Investigation of high ice supersaturation in cirrus clouds using ARM data and an explicit cloud model Comstock, Jennifer Pacific Northwest National Laboratory Lin, Ruei-Fong NASA...

290

ARM - Publications: Science Team Meeting Documents  

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focus of this study is to estimate the confidence intervals of the Atmospheric Radiation Measurement (ARM) Enhanced Shortwave Experiment (ARESE) solar radiation measurements on...

291

ARM - Publications: Science Team Meeting Documents  

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traceable to an international standard is the first step in establishing research quality solar irradiance measurement capabilities. All radiometers used in the ARM Program for...

292

ARM - Publications: Science Team Meeting Documents: Spectral...  

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over the ARM SGP area from multi-year satellite observations Trishchenko, Alexander Canada Centre for Remote Sensing Luo, Yi Canada Centre for Remote Sensing Li, Zhanqing...

293

ARM - Publications: Science Team Meeting Documents: Autonomous...  

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Autonomous Retrieval of Cloud and Aerosol Properties from ARM Micropulse Lidar Flynn, Connor Pacific Northwest National Laboratory Christy, Jason Columbia University Beus, Sherman...

294

ARM - Publications: Science Team Meeting Documents  

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ARM Micropulse Lidar: Configuration Upgrades and New Data Products Flynn, C.J., Mendoza, A., and Christy, J., Pacific Northwest National Laboratory Fourteenth Atmospheric Radiation...

295

ARM - Publications: Science Team Meeting Documents  

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in Stratus Clouds Evidence of High Ice Supersaturation in Cirrus Clouds Using ARM Raman Lidar Measurements* Local Correlations and Multifractal Behavior in Marine Boundary Layer...

296

ARM - Publications: Science Team Meeting Documents  

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Systems Laboratory is operating a network of GPS receivers located at each of their wind profiler sites. The University of Oklahoma, in cooperation with the ARM program,...

297

ARM - Publications: Science Team Meeting Documents  

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Effects of Land-Surface Physics on the Cloud-Resolving Simulations During the ARM Summer 1997 IOP Wang, D.H. (a,b) and Xu, K.M.(b), Hampton University (a), NASA Langley Research...

298

ARM - 2006 Science Team Meeting Presentations  

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from the ARM Archive Raymond McCord (PDF, 2MB) Joint Meeting of Instantaneous Radiative Flux (IRF) and Clouds with Low Optical Water Depths CLOWD Working Groups: NSA Broadband...

299

ARM - Publications: Science Team Meeting Documents  

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Using GFS Weather Model to Reduce Diurnal Differences Between GPS PW and ARM MWR PW Van Hove, T.(a), Liljegren, J.C.(b), Rocken, C.(a), and Braun, J.(a), University Corporation for...

300

ARM - Publications: Science Team Meeting Documents  

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since April 2002. This poster will present a view of the 20022003 Australian summer monsoon through the use of data collected by both the ARM and existing Bureau of Meteorology...

Note: This page contains sample records for the topic "arm science team" from the National Library of EnergyBeta (NLEBeta).
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they are not comprehensive nor are they the most current set.
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301

ARM - Publications: Science Team Meeting Documents  

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and ARM Enhanced Shortwave Experiment Aircraft Data J.K. Ayers, D.R. Doelling, L. Nguyen, W.L. Smith, Jr., and P. Minnis Cloud Optical Properties Obtained from the...

302

ARM - Publications: Science Team Meeting Documents  

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M.W. An Overview of ARM Satellite Cloud and Radiation Budget Datasets* Minnis, P., Nguyen, L., Smith Jr., W.L., Doelling, D.R., Heck, P.W., Khaiyer, M.M., Palikonda, R., Young,...

303

ARM - Publications: Science Team Meeting Documents  

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Retrieval of Ice Water Path, Ice Particle Size, and Shape Mitchell, D.L., Arnott, W.P., and Ivanova, D.C., Desert Research Institute Twelfth Atmospheric Radiation Measurement (ARM)...

304

ARM - Publications: Science Team Meeting Documents  

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University of Utah has been archiving (daily) column data from the NCEP Medium Range Forecast (MRF) model for various sites over the globe. Four of these sites coincide with ARM...

305

ARM - Publications: Science Team Meeting Documents: Scanning...  

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November 2002 rejoined the program to participate in the SGP leg of the ARM-UAV "Grand Tour". S-HIS spectral coverage is 580-3000 cm-1 with a resolution of 0.5 cm-1, and spatially...

306

ARM - Publications: Science Team Meeting Documents: Variance...  

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Sciences, UCLA Neelin, David Department of Atmospheric and Oceanic Sciences, UCLA Thermodynamic variance similarity in shallow cumulus topped mixed layers is studied using...

307

ARM - Publications: Science Team Meeting Documents: Abstracts sorted by  

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Meeting Meeting 2005 Proceedings Proceedings Sorted by Title Proceedings Sorted by Author Science Team Meeting Proceedings Cover image Proceedings of the Fifteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting ARM-CONF-2005, March 2005 Daytona Beach, Florida For proper viewing, extended abstracts should be viewed with Adobe Acrobat Reader. Download the latest version from the Adobe Reader website. * Poster abstract only; an extended abstract was not provided by the author(s). View session papers by Author or Title. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A Abdou, W. Determination of Aerosol and Surface Reflectance Characteristics at the ARM CART Site Using MISR Observations* Ackerman, A. Factors Controlling the Properties of Multi-Phase Arctic

308

ARM - Publications: Science Team Meeting Documents  

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Observations and Stochastic Modeling of Shortwave Radiative Transfer at the Observations and Stochastic Modeling of Shortwave Radiative Transfer at the ARM CART Sites Secora, J.M. and Veron, D.E., Rutgers University Stochastic modeling has been shown to be a promising technique for representing shortwave radiative transfer through fractional cloud fields and may be a suitable approach for characterizing the impact of macroscale inhomogeneity of the cloud field on the radiation in an Atmospheric General Circulation Model (AGCM) environment. To ascertain the conditions under which the stochastic approach would be appropriate in an AGCM, several steps have been taken. Initially, we have analyzed both microphysical and geometrical cloud characteristics for one year at three Atmospheric Radiation Measurement (ARM) Program Cloud and Radiation Testbed (CART)

309

ARM - Publications: Science Team Meeting Documents  

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The CCPP-ARM Parameterization Test Bed (CAPT) The CCPP-ARM Parameterization Test Bed (CAPT) Potter, G.L.(a), Williamson, D.L.(b), Cederwall, R.T.(a), and Xie, S.(a), Lawrence Livermore National Laboratory (a), National Center for Atmospheric Research (b) In an attempt to improve GCMs that are used to project future climate change, we have borrowed a technique from the NWP community to identify and isolate model errors. We are using high-frequency (~6 hourly) NWP analyses both to realistically initialize (using the state fields: T, U, V, Q, and Ps) a climate GCM to evaluate the accuracy of its subsequent short-range weather forecasts and to diagnose the structure and growth of the identified forecast errors. The rationale is that most of the climate GCM's forecast errors can be attributed to parameterization deficiencies, once

310

ARM - Publications: Science Team Meeting Documents  

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New Meteorological Applications Using AERI Thermodynamic Profiling New Meteorological Applications Using AERI Thermodynamic Profiling Feltz, W.F.(a), Howell, H.B.(a), Knuteson, R.O.(a), Mecikalski, J.(b), Bedka, K.(a), Tanamachi, R.L.(c), and Posselt, D.(d), University of Wisconsin SSEC/CIMSS (a), University of Alabama - Huntsville (b), University of Oklahoma (c), Colorado State University (d) The DOE ARM program has supported the development of a robust and operational thermodynamic retrieval algorithm using AERI high spectral resolution infrared radiances. These retrievals of temperature and water vapor have been used for a number of ARM research projects including planetary boundary layer (PBL) large eddy simulation, NWP validation, PBL height estimation, and for investigating the utility of driving SCM/CRM models continuously at the SGP site. New AERIplus retrieval meteorological

311

ARM - Publications: Science Team Meeting Documents  

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The MERGED_SOUNDING VAP: A Status Report and Description The MERGED_SOUNDING VAP: A Status Report and Description Miller, M.A.(a), Troyan, D.T.(a), and Mace, G.G.(b), Brookhaven National Laboratory (a), University of Utah (b) The Value-added Product (VAP) known as MERGED_SOUNDING has been deemed a very desirous component of ARMs suite of VAPs. To have a thermodynamics profile of the atmosphere at one-minute temporal intervals and uniform height levels available for ARM data users eliminates much redundancy and inconsistency as investigators will now have standard atmospheric profiles at their disposal. The values which constitute the thermodynamics profile include: Temperature, Relative Humidity, Vapor Pressure, Barometric Pressure, Wind Speed and Direction, and Dewpoint. The data integrated to form the MERGED_SOUNDING data stream comes from radiosonde launches, model

312

ARM - Publications: Science Team Meeting Documents  

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USA (a), Centre for Earth Observation Science, Geography Department, University of Manitoba, Winnipeg, Manitoba, Canada (b), Institute of Atmospheric Physics - Consiglio...

313

ARM - Publications: Science Team Meeting Documents  

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consist of over twelve sites. The science objective is ground truth for global satellite retrieval and accurate vertical distribution information in combination with surface...

314

ARM - Publications: Science Team Meeting Documents  

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Modeling Aerosols and Clouds with the Global Environmental Multiscale Air Quality (GEM-AQ) Model Iziomon, M.G. and Lohmann, U., Department of Physics and Atmospheric Science,...

315

ARM - Publications: Science Team Meeting Documents  

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Global Lidar Observations of Cloud and Aerosol Campbell, J.R. (a), Welton, E.J. (b), Spinhrine, J.D. (c), and Flynn, C.J. (d), Science Systems Applications, Inc. (a), University of...

316

ARM - Publications: Science Team Meeting Documents  

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The March 2000 Cloud Intensive Observing Period; The Evolution of the The March 2000 Cloud Intensive Observing Period; The Evolution of the Synoptic-Scale Atmosphere and the Associated Cloud Radiative Forcing Mace, G.G.(a), Sonntag, K.L.(b), Kato, S.(c), Poellot, M.(d), Twohy, C.(e), Troth, S.(a), Zhang, Q.(a), and Minnis, P.(c), University of Utah (a), Unviersity of Oklahoma (b), NASA Langley Research Center (c), University of North Dakota (d), Oregon State University (e) During the first 3 weeks of March 2000, an intensive observing period (IOP) was held near the central facility of the Southern Great Plains ARM site. In conjunction with the ARESE II campaign, the objective of this IOP was to observe the 3-dimensional structure of the cloud field using multiple scanning and vertically pointing millimeter radars. In anticipation of

317

ARM - Publications: Science Team Meeting Documents  

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New Concepts for Improved Performance of Dynamical and Microphysical New Concepts for Improved Performance of Dynamical and Microphysical Parameterization of Clouds Sud, Y.C.(a) and Walker, G.K.(b), NASA/Laboratory for Atmospheres Goddard Space Flight Center Three new concepts were launched for: i) simulating more shallow convection, ii) capturing mid-level convection and iii) better simulating the boundary-layer convection forced boundary-layer clouds. Each process was prameterized and evaluated in the ARM-CART SCM environment. The individual and combined influence of these on the simulated boundary-layer, shallow cumulus, mid-level cloudiness were examined. In addition, a physically based vertical adjustment of the advective air-mass transport was parameterized to better capture the isentropic character of horizontal advection. This modification eliminated the near surface temperature biases

318

ARM - Publications: Science Team Meeting Documents  

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Variability of Continental Liquid-Water Cloud and Its Parameterization Variability of Continental Liquid-Water Cloud and Its Parameterization Using ARM Data Kim, B.-G.(a), Klein, S.A.(b), and Norris, J.R.(c), Princeton University (a), GFDL (b), Scripps Institute of Oceanography (c) Cloud radiative properties are important in the determination of cloud-climate interactions. Additionally, the boundary layer cloud inhomogeneity has a primary influence in reducing the albedo relative to that computed using plane-parallel approximation. Variability in cloud properties at scales smaller than those resolved by large-scale motions may cause significant biases and therefore must parameterized. An attractive solution is to introduce the cloud statistical scheme that uses a probability distribution function (PDF) to represent its subgrid-scale

319

ARM - Publications: Science Team Meeting Documents  

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The Association of the Cirrus Properties Over the Western Tropical Pacific The Association of the Cirrus Properties Over the Western Tropical Pacific with Tropical Deep Convection Deng, M.(a), Mace, G.G.(a), and Soden, B.J.(b), Univesity of Utah (a), Geophysical Fluid Dynamics Laboratory (b) The microphysical and radiative properties of upper tropospheric clouds in the tropics are known to have a substantial influence on climate. Observations from long term cloud radar measurements in the tropics show that upper tropospheric clouds are observed above 10 km as much as 40% of the time depending on location. By combining satellite observations with observations from the tropical ARM site on Nauru and Manus Islands we examine the macro and microphysical properties of these clouds in terms of their association with deep convection. The fundamental questions we will

320

ARM - Publications: Science Team Meeting Documents  

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Simplifying Access to the North Slope of Alaska Data Streams Simplifying Access to the North Slope of Alaska Data Streams Bahrmann, C.P.(a), Richardson, S.R.(a), Clothiaux, E.E.(a), Verlinde, J.(a), McCord, R.A.(b), and Horwedel, B.(b), Department of Meteorology, The Pennsylvania State University (a), Oak Ridge National Laboratory (b) In August 2003, the NSA Site Scientist Team initiated a meta-data investigation on all NSA data streams. This investigation started by examining data streams for measurement name discrepancies. For example, the nsaskyrad60sC1.a1 data stream contains the measurement from a Shaded PSP. From 1998-02-14 through 2001-03-31 the measurement was called psps_mean (PSP shaded mean). On 2003-04-01 the measurement was renamed to down_short_diffuse_hemisp (Downwelling Shortwave Diffuse Hemispheric

Note: This page contains sample records for the topic "arm science team" from the National Library of EnergyBeta (NLEBeta).
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321

ARM - Publications: Science Team Meeting Documents: ARM Radiative...  

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ARM Radiative Transfer Modeling and Remote Sensing Clough, Shepard Atmospheric and Environmental Research Shephard, Mark Atmospheric and Environmental Research, Inc. Mlawer, Eli...

322

ARM - Publications: Science Team Meeting Documents: ARM-UAV Instrument...  

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ARM-UAV Instrumentation Used On The Proteus Aircraft During The M-PACE Experiment McCoy, Robert Sandia National Laboratories Tooman, Tim Sandia National Laboratories The...

323

ARM - Publications: Science Team Meeting Documents: ARM Site Atmospheric  

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ARM Site Atmospheric State Best Estimates for AIRS Forward Model and ARM Site Atmospheric State Best Estimates for AIRS Forward Model and Retrieval Validation Tobin, David University of Wisconsin-Madison Revercomb, Henry University Of Wisconsin-Madison Knuteson, Robert University Of Wisconsin Feltz, Wayne University of Wisconsin Moy, Leslie University of Wisconsin-Madison Lesht, Barry Argonne National Laboratory Cress, Ted Pacific Northwest National Laboratory Strow, Larrabee Hannon, Scott Fetzer, Eric Jet Propulsion Laboratory The Atmospheric Infrared Sounder (AIRS) on the EOS Aqua platform is the first of a new generation of advanced hyperspectral atmospheric sounders with the capability of retrieving temperature and trace gas profiles with high vertical resolution and absolute accuracy. In the past few years ARM has played a major role in the validation of AIRS, including the launch of

324

Proceedings of the third Atmospheric Radiation Measurement (ARM) science team meeting  

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This document contains the summaries of papers presented at the 1993 Atmospheric Radiation Measurement (ARM) Science Team meeting held in Morman, Oklahoma. To put these papers in context, it is useful to consider the history and status of the ARM Program at the time of the meeting. Individual papers have been cataloged separately.

Not Available

1994-03-01T23:59:59.000Z

325

Chief Scientist Report ARM Science Team Meeting 2008  

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the best poster you see. Lobbying for your poster is discouraged. Mar 2009 ARM Plenary 6 A brief sampler of ARM accomplishments A brief sampler of ARM accomplishments Mar 2009...

326

ARM - Publications: Science Team Meeting Documents: External Data Stream  

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External Data Stream Review External Data Stream Review Wagener, Richard Brookhaven National Laboratory Ma, Lynn DOE/Brookhaven National Laboratory Gregory, Laurie Brookhaven National Laboratory Tichler, Joyce DOE/Brookhaven National Laboratory Horwedel, Betsy Oak Ridge National Laboratory Cialella, Alice Brookhaven National Laboratory In terms of data volume, about half the data in the ACRF archive were generated outside of the ARM program and collected by the eXternal Data Center (XDC) from external sources, processed to standard formats, documented, and forwarded to the archive. This constitutes a unique resource drawing many users to the archive, however it involves a significant effort and we must assure that the effort is spent where it provides the most benefit to the ACRF science mission. Here, we present a

327

ARM - Publications: Science Team Meeting Documents: Update on...  

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California, San Diego The DOE CAPT project involves comparison of short-range weather forecasts from climate models to ARM data to assess errors in existing and prospective...

328

ARM - Publications: Science Team Meeting Documents: Comparison of ECMWF  

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Comparison of ECMWF Model and ARSCL Cloudiness at the ARM SGP site Comparison of ECMWF Model and ARSCL Cloudiness at the ARM SGP site Kollias, Pavlos RSMAS/University of Miami Albrecht, Bruce University of Miami The Department of Energy (DOE) Atmospheric Radiation Measurements (ARM) Program operates a comprehensive suite of active remote sensors at Southern Great Plains (SGP) in Oklahoma since 1996 to detect all hydrometeors in the atmospheric column above. Due to its location, the ARM SGP site cloud and precipitation climatology it is believed to be representative of mid-latitudes. Long-term (6.5 years) observations from this ARM site are used to provide a cloud and precipitation climatology. A cloud classification scheme based on cloud base height, fractional coverage, cloud thickness, cloud reflectivity and precipitation detection at the

329

ARM - Publications: Science Team Meeting Documents: Assessing physical  

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Assessing physical processes in the ECMWF model forecasts through the ARM Assessing physical processes in the ECMWF model forecasts through the ARM SGP site measurements Neggers, Roel European Centre for Medium-range Weather Forecasts (ECMWF) Cheinet, Sylvain ECMWF (UK) Beljaars, Anton ECMWF Koehler, M European Centre for Medium-range Weather Forecasts, Reading, Morcrette, Jean-Jacques European Centre for Medium-Range Weather Forecasts Viterbo, Pedro ECMWF In this study, we compare short-term weather forecasts of the ECMWF model (Integrated Forecast System, IFS) to measurements at the Southern Great Plains (SGP) site of the Atmospheric Radiation Measurement (ARM) program in July 2003. By using a number of ARM instruments and complementary satellite and radar network data, a number of systematic deficiencies are characterized in the IFS, focusing on mixing processes.

330

ARM - Publications: Science Team Meeting Documents: AERI Thermodynamic  

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AERI Thermodynamic Profiling VAP Improvements and Status AERI Thermodynamic Profiling VAP Improvements and Status Feltz, Wayne University of Wisconsin Howell, Ben University of Wisconsin-Madison Turner, David Pacific Northwest National Laboratory Mahon, Rick Pacific Northwest National Laboratory Knuteson, Robert University Of Wisconsin The Atmospheric Emitted Radiance Interferometer (AERI) was one of the primary instruments developed under the DOE ARM instrument development program (IDP) to be deployed to the Climate Research Facility (CRF) Southern Great Plains (SGP) central site near Lamont, Oklahoma. A prototype AERI was deployed in March 1993 where it collected data until the first AERI operational instrument replaced it in July 1999. The ARM archive contains AERI data from the ARM CART SGP central facility site from January

331

ARM - Publications: Science Team Meeting Documents: Cloud Radiative Forcing  

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Cloud Radiative Forcing at the ARM Climate Research Facility: Part 2. The Cloud Radiative Forcing at the ARM Climate Research Facility: Part 2. The Vertical Redistribution of Radiant Energy by Clouds. Mace, Gerald University of Utah Benson, Sally University of Utah Kato, Seiji Hampton University/NASA Langley Research Center Documentation with data of the effects of clouds on the radiant energy balance of the surface and atmosphere represent a critical shortcoming in the set of observations that are needed to ascertain the validity of model simulations of the earth's climate. While clouds are known to cool the climate system from TOA radiation budget studies, the redistribution of energy between the surface and atmosphere and within the atmosphere by clouds has not been examined in detail. Using data collected at the Atmospheric Radiation Measurement Program (ARM) Southern Great Plains (SGP)

332

ARM - Publications: Science Team Meeting Documents: Determination of  

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Determination of Aerosol and Surface Reflectance Characteristics at the ARM Determination of Aerosol and Surface Reflectance Characteristics at the ARM CART Site Using MISR Observations Martonchik, John Jet Propulsion Laboratory Diner, David Jet Propulsion Laboratory Kahn, Ralph Jet Propulsion Laboratory Abdou, Wedad Jet Propulsion Laboratory Gaitley, Barbara Jet Propulsion Laboratory Aerosol optical depth and surface directional reflectance at the ARM CART site are routinely determined from data obtained with the Multi-angle Imaging SpectroRadiometer (MISR) instrument on the Terra platform. The observations span the four years 2001-2004, with an overpass frequency of about four views per month. The MISR aerosol/surface retrieval process provides aerosol products at a spatial resolution of 17.6 km and surface products at a higher resolution of 1.1 km. This study is part of a larger

333

ARM - Publications: Science Team Meeting Documents: Millimeter-wave (183  

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Millimeter-wave (183 GHz) Radiometer for High Sensitivity Water Vapor Millimeter-wave (183 GHz) Radiometer for High Sensitivity Water Vapor Measurements at the North Slope of Alaska ARM Site Pazmany, Andrew ProSensing Inc. Funded by a Phase II DOE SBIR contract, ProSensing Inc. is developing a turn-key 183 GHz water vapor radiometer for measuring low concentrations of atmospheric water vapor and liquid water at the North Slope of Alaska ARM site during the dry winter months. The first prototype instrument measures brightness temperature at four double sideband channels centered 1, 3, 7 and 14 GHz from the 183.31 GHz water vapor resonance line. The combination of 0.1 K delta T measurement precision and less than 1 K accuracy integrated hot (~350 K) and warm (~300 K) calibration targets, is expected to result an absolute water vapor measurement accuracy of less than 0.1 mm

334

ARM - Publications: Science Team Meeting Documents: Testing and Deployment  

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Testing and Deployment of an Infrared Thermometer Network at the ARM Testing and Deployment of an Infrared Thermometer Network at the ARM Southern Great Plains Climate Research Facility Morris, Victor Pacific Northwest National Laboratory Long, Chuck Pacific Northwest National Laboratory To increase our ability to calculate heating rate profiles to study the variability across the Global Climate Model scale area and for inferring information about distribution and character of cloudiness across the Southern Great Plains (SGP) domain, downwelling Infrared Thermometers (IRT) will be installed at the SGP Extended Facilities (EF). Initially, IRTs will be installed at five of the twenty-one EFs and one at the Central Facility (CF). The sky brightness temperature measurements will be sampled at a rate of 5 Hz to capture the inherent variability under cloudy and partly cloudy

335

ARM - Publications: Science Team Meeting Documents: Seasonal Dependance of  

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Seasonal Dependance of the Infrared Land Surface Emissivity in the Vicinity Seasonal Dependance of the Infrared Land Surface Emissivity in the Vicinity of the ARM SGP Central Facility Knuteson, Robert University Of Wisconsin Feltz, Wayne University of Wisconsin Revercomb, Henry University Of Wisconsin-Madison Tobin, David University of Wisconsin-Madison Satellite observations have been used to derive a seasonal dependance of the infrared land surface emissivity in the vicinity of the ARM Southern Great Plains (SGP) Central Facility site. In particular, the observations of the Atmospheric InfraRed Sounder (AIRS) on the NASA EOS Aqua platform have been used over the two year period from Sept 2002 to Sept 2004 to derive spectra of IR land surface emissivity across the IR window regions. These satellite observations have been used to empirically fit the

336

ARM - Publications: Science Team Meeting Documents: MICROBASE, A Continuous  

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MICROBASE, A Continuous Baseline Microphysical Retrieval: Status and Future MICROBASE, A Continuous Baseline Microphysical Retrieval: Status and Future Plans Miller, Mark Brookhaven National Laboratory Johnson, Karen Brookhaven National Laboratory Michael, Paul Brookhaven National Laboratory Mace, Gerald University of Utah The MICROBASE_PI and MICROBASE_PA value-added products (VAPs) are integral components of the Broadband Heating Rate Profile (BBHRP) project of the Atmospheric Radiation Measurement (ARM) Program. The goal of the BBHRP project is to determine atmospheric heating and cooling rate profiles in the column above the active sensors at each ARM Climate Research Facility (ACRF) sites and within a larger volume around each site, representative of a global climate model grid cell. To produce the heating rate profiles,

337

ARM - Publications: Science Team Meeting Documents: A decade long aerosol  

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A decade long aerosol and cloud statistics and aerosol indirect effect at A decade long aerosol and cloud statistics and aerosol indirect effect at the ARM SGP site Min, Qilong State University of New York at Albany Duan, Minzheng State University of New York at Albany Harrison, Lee State University of New York Joseph, Everette Howard University Twelve-year data of MFRSR and MWR have been used to derive aerosol and cloud optical properties at the ARM SGP. Diurnal, monthly, seasonal and interannual variability of aerosol (optical depth and Angstrom coefficient) and cloud (optical depth and effective radius) have been analyzed. We specially focused on aerosol-cloud interactions. We found a signature of indirect aerosol effect for summer data: increased aerosol index has a statistically-significant anti-correlation with mean effective radius. No

338

ARM - Publications: Science Team Meeting Documents: The SGP Aerosol...  

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banner Cart Icon Cart | Home | People | Site Index Atmospheric Radiation Measurement Climate Research Facility US Department of Energy About Science Campaigns Sites Instruments...

339

ARM - Publications: Science Team Meeting Documents: Ensemble Single Column  

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Ensemble Single Column Modelling (ESCM) in the Tropical Western Pacific Ensemble Single Column Modelling (ESCM) in the Tropical Western Pacific Hume, Timothy Bureau of Meteorology Research Centre Jakob, Christian BMRC Single column models (SCMs) are useful tools for the evaluation of parameterisations of radiative and moist processes used in general circulation models. Most SCM studies to date have concentrated on regions where there is a sufficiently dense observational network to derive the required forcing data, such as the Southern Great Plains. This poster describes an ensemble single column modelling (ESCM) approach, where an ensemble of SCM forcing data sets are derived from numerical weather prediction (NWP) analyses. The technique is applied to SCM runs at the Manus Island and Nauru ARM sites in the Tropical Western Pacific (TWP). It

340

ARM - Publications: Science Team Meeting Documents: Using EOF analysis to  

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Using EOF analysis to uncover inhomogeneities in data from ground-based Using EOF analysis to uncover inhomogeneities in data from ground-based aerosol monitoring devices Gianelli, Scott NASA/GISS Carlson, Barbara NASA/Goddard Institute for Space Studies Lacis, Andrew NASA/Goddard Institute for Space Studies Empirical Orthogonal Function (EOF) analysis is performed on ground-based shadowband and sun photometer data. The instruments examined for this study include the Rotating Shadowband Spectroradiometer (RSS) and the CIMEL sun photometer CSPHOT located at the central facility of the Southern Great Plains (SGP) site; networks of Multi-Filter Rotating Shadowband Radiometer (MFRSR) devices sponsored by ARM and the USDA; and the network of nephelometers and aerosol particle counters of the Climate Monitoring Diagnostics Laboratory (CMDL). The original purpose of this investigation

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341

ARM - Publications: Science Team Meeting Documents: Spatially Distributed  

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Spatially Distributed CO2, Sensible, and Latent Heat Fluxes over the Spatially Distributed CO2, Sensible, and Latent Heat Fluxes over the Southern Great Plains Biraud, Sebastien Lawrence Berkeley National Laboratory Riley, William Lawrence Berkeley National Laboratory Fischer, Marc Lawrence Berkeley National Laboratory Torn, Margaret Lawrence Berkeley National Laboratoroy Berry, Joseph Carnegie Inst.of Washington Cooley, Heather Lawrence Berkeley National Laboratory Vegetation and vegetation processes strongly influence the spatial distribution of sensible and latent heat fluxes, as well as controlling ecosystem-atmosphere CO2 exchange. Estimating spatially distributed ecosystem fluxes is important for ARM cloud modeling and for the North American Carbon Program. We describe here a methodology to estimate surface energy fluxes and net ecosystem CO2 Exchange (NEE) continuously over the

342

ARM - Publications: Science Team Meeting Documents: Rotating Shadowband  

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Rotating Shadowband Spectroradiometer (RSS) at SGP: Performance, Data Rotating Shadowband Spectroradiometer (RSS) at SGP: Performance, Data Processing, and Value-Added Products Kiedron, Piotr State University of New York Albany Schlemmer, Jim The first ARM owned RSS was deployed at SGP central site in May 2003. This RSS provides direct-normal, diffuse-horizontal andtotal-horizontal components of irradiance at 1001 pixels in 360nm-1050nm spectral range every minute between dawn and dusk. The instrument operated continuously since the deployment date. At first bi-weekly radiometric calibrations were instituted and upon the discovery of significant responsivity drift this rigorous calibration schedule was continued till present. However the rate of change was steadily decreasing. By September 2004 the drift was less than 1% per month. Within three month from deployment date a slight

343

ARM - Publications: Science Team Meeting Documents: Validation of infrared  

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Validation of infrared cloud radiative transfer simulations and spectral Validation of infrared cloud radiative transfer simulations and spectral cloud properties retrievals using S-HIS, AERI and HSRL measurements from M-PACE Holz, Robert University of Wisconsin, CIMMS DeSlover, Daniel University of Wisconsin Revercomb, Henry University Of Wisconsin-Madison Tobin, David University of Wisconsin-Madison Knuteson, Robert University Of Wisconsin Turner, David Pacific Northwest National Laboratory Eloranta, Edwin University of Wisconsin As part of the Mixed-Phase Arctic Cloud Experiment (M-PACE) the Scanning High spectral resolution Interferometer Sounder (S-HIS) flew on the Proteus high altitude aircraft with the ARM-UAV instrumentation. The University of North Dakota Cessna Citation capable of cloud situ measurements was coordinated with the Proteus to obtain coincident down looking and situ

344

ARM - Publications: Science Team Meeting Documents: University of Wisconsin  

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University of Wisconsin High Spectral Resolution Lidar operations during University of Wisconsin High Spectral Resolution Lidar operations during MPACE Eloranta, Edwin University of Wisconsin The Arctic High Spectral Resolution Lidar(AHSRL) operated at the North Slope ARM site as part of MPACE from 24-Sept-04 to 17-Nov-04. Data was archived 24-hours/day for the entire period with only minor interruptions: One day data was lost due to a problem in the laser cooling system, and one-half of a day was lost due to an electrical power failure at the site. All of the data is archived on our web site and can be accessed using web routines which process data on demand. This allows users to specify the exact time and altitude range of the data they wish acquire and to specify both the temporal and spatial averaging which is most appropriate for their

345

ARM - Publications: Science Team Meeting Documents: Establishing Continuous  

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Establishing Continuous Atmospheric Profiles at the North Slope of Alaska Establishing Continuous Atmospheric Profiles at the North Slope of Alaska ACRF Delamere, Jennifer Atmospheric and Environmental Research, Inc. Turner, David Pacific Northwest National Laboratory Mlawer, Eli Atmospheric & Environmental Research, Inc. Clough, Shepard Atmospheric and Environmental Research Miller, Mark Brookhaven National Laboratory Troyan, David Brookhaven National Laboratory Clothiaux, Eugene The Pennsylvania State University Accurate and continuous vertical profiles of the atmospheric state above the North Slope of Alaska ARM Climate Research Facility (NSA ACRF) are a necessity for both accurate forward radiative transfer calculations and cloud microphysical retrievals. In particular, such profiles are a critical component of two important initiatives at the NSA site, the Broadband

346

ARM - Publications: Science Team Meeting Documents: Clouds in the Darwin  

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Clouds in the Darwin area and their relation to large-scale conditions Clouds in the Darwin area and their relation to large-scale conditions Jakob, Christian BMRC Hoeglund, Sofia Lulea University of Technology This poster shows a climatological overview of the cloud cover in the Darwin region (location of a TWP ARM site) in the very north of Australia. Information on optical thickness and cloud top pressure from the ISCCP Stage D1 product over the time period 1985 to 2000 has been used to examine how the cloud cover changes over the course of a year, and also how it is affected by the seasonal changes in the region. The most remarkable changes can be seen during the wet (summer) season, when wet westerly winds sweep in over Darwin and dramatically change the weather conditions. By dividing the cloud cover into cloud regimes, one can also see an

347

ARM - Publications: Science Team Meeting Documents: Deployment of a  

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Deployment of a scintillometer for optical turbulence investigation at NSA Deployment of a scintillometer for optical turbulence investigation at NSA - Barrow Moudry, Dana University of Alaska Fairbanks Sassen, Kenneth University of Alaska Fairbanks Vaucher, Gail Army Research Laboratory Zak, Bernard Sandia National Laboratories The University of Alaska Fairbanks in collaboration with the White Sands Army Research Lab deployed a reciprocal-path scintillometer to the ARM - NSA site at Barrow in fall 2004 for investigation of optical turbulence over the course of a year. The instrument consists of a transmitter and a receiver located approximately 1km apart. The instrument transmitter includes two arrays of nearIR LEDs which emit light in a 125-Hz pulsed mode. The receiver measures the temporal variability of the radiation after

348

ARM - Publications: Science Team Meeting Documents: Observations of Natural  

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Observations of Natural Variability in Marine Stratocumulus Clouds Observations of Natural Variability in Marine Stratocumulus Clouds Albrecht, Bruce University of Miami Kollias, Pavlos RSMAS/University of Miami Jo, Ieng Rosentiel School of Marine & Atmospheric Science Ghate, Virendra RSMAS/Univ. Miami Serpetzoglou, Efthymious Minnis, Patrick NASA Langley Research Center Sun-Mack, Szedung SAIC Large to mesoscale features affecting the albedo of marine stratocumulus clouds are observed frequently and can have a substantial impact on the overall albedo of the subtropical cloud decks. One such naturally occurring feature-defined as a cloud rift-is characterized as a large-scale, persistent area of broken, low reflectivity stratocumulus clouds usually surrounded by a solid deck of stratocumulus. We review results from a

349

ARM - ARM Science Board  

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Science Board Board Business About Become a User Recovery Act Mission FAQ History Organization Participants Facility Statistics Forms Contacts Facility Documents ARM Management...

350

ARM - Publications: Science Team Meeting Documents: W-Band ARM Cloud Radar  

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W-Band ARM Cloud Radar System W-Band ARM Cloud Radar System Mead, James ProSensing Inc. Widener, Kevin Pacific Northwest National Laboratory The W-Band ARM Cloud Radar (WACR) is a dual polarization 95 GHz radar that will be deployed at the SGP CART site in the spring of 2005. The WACR system will be installed in the existing MMCR shelter, and will provide continuous zenith pointing measurements of clouds to compliment measurements provided by MMCR. Built by ProSensing Inc. of Amherst, MA, the WACR system include a high peak power (1.5 kW) EIKA transmitter, low noise receiver, and PC-based digital receiver. In addition to an internal calibration procedure, an electronically controlled deflector plate mounted on the roof of the MMCR shelter will be used to periodically illuminate a

351

Proceedings of the sixth Atmospheric Radiation Measurement (ARM) Science Team meeting  

Science Conference Proceedings (OSTI)

This document contains the summaries of papers presented at the 1996 Atmospheric Radiation Measurement (ARM) Science Team meeting held at San Antonio, Texas. The history and status of the ARM program at the time of the meeting helps to put these papers in context. The basic themes have not changed. First, from its beginning, the Program has attempted to respond to the most critical scientific issues facing the US Global Change Research Program. Second, the Program has been strongly coupled to other agency and international programs. More specifically, the Program reflects an unprecedented collaboration among agencies of the federal research community, among the US Department of Energy`s (DOE) national laboratories, and between DOE`s research program and related international programs, such as Global Energy and Water Experiment (GEWEX) and the Tropical Ocean Global Atmosphere (TOGA) program. Next, ARM has always attempted to make the most judicious use of its resources by collaborating and leveraging existing assets and has managed to maintain an aggressive schedule despite budgets that have been much smaller than planned. Finally, the Program has attracted some of the very best scientific talent in the climate research community and has, as a result, been productive scientifically.

NONE

1997-06-01T23:59:59.000Z

352

ARM - Science  

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Read about the 20 years of accomplishments (PDF, 696KB) from the ARM Program and user facility. Performance Metrics ASR Metrics 2009 2008 2007 2006 Science New C-band...

353

ARM - Key Science Questions  

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govScienceKey Science Questions govScienceKey Science Questions Science Research Themes Research Highlights Journal Articles Collaborations Atmospheric System Research (ASR) ARM Science Team Meetings User Meetings Annual Meetings of the Atmospheric System Research (ASR) Science Team and Fall Working Groups Accomplishments Read about the 20 years of accomplishments (PDF, 696KB) from the ARM Program and user facility. Performance Metrics ASR Metrics 2009 2008 2007 2006 Key Science Questions The role of clouds and water vapor in climate change is not well understood; yet water vapor is the largest greenhouse gas and directly affects cloud cover and the propagation of radiant energy. In fact, there may be positive feedback between water vapor and other greenhouse gases. Carbon dioxide and other gases from human activities slightly warm the

354

Eleventh ARM Science Team Meeting Proceedings, Atlanta, Georgia, March 19-23, 2001  

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Spectroscopic Remote Sensing of Clouds Spectroscopic Remote Sensing of Clouds S. V. Dvoryashin and G. S. Golitsyn A. M. Obukhov Institute of Atmospheric Physics Russian Academy of Sciences Moscow, Russia Introduction Cloud investigations using remote sensing are becoming increasingly significant. Parameters of particular interest include optical thickness, liquid water content, and liquid water path. At present, the following cloud parameters can be obtained from ground-based measurements: * optical thickness - from measurements of sunlight fluxes transmitted by a cloud * liquid water path - from measurements of absorption of microwave radiation by cloud droplets * cloud-bottom height - with the use of Lidar. The application of these methods of cloud investigation encounter some problems because measure-

355

ARM Science Plan  

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ER-ARM-0402 ER-ARM-0402 Atmospheric Radiation Measurement Program Science Plan Current Status and Future Directions of the ARM Science Program Thomas P. Ackerman, Lead Author Anthony D. Del Genio Gregory M. McFarquhar Robert G. Ellingson Peter J. Lamb Richard A. Ferrare Charles N. Long Steve A. Klein Johannes Verlinde October 2004 United States Department of Energy Office of Science, Office of Biological and Environmental Research Executive Summary The Atmospheric Radiation Measurement (ARM) Program has matured into one of the key programs in the U.S. Climate Change Science Program. The ARM Program has achieved considerable scientific success in a broad range of activities, including site and instrument development, atmospheric radiative

356

ARM - SGP Science  

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Science Science SGP Related Links Facilities and Instruments Central Facility Boundary Facility Extended Facility Intermediate Facility Radiometric Calibration Facility Geographic Information ES&H Guidance Statement Operations Science Field Campaigns Visiting the Site Fact Sheet Images Information for Guest Scientists Contacts SGP Science Overall Objectives The primary goal of the Southern Great Plains (SGP) site is to produce data adequate to support significant research addressing the objectives of the overall ARM Climate Research Facility. These overall objectives, as paraphrased from the ARM Program Plan (DOE 1990), are the following: to describe the radiative energy flux profile of the clear and cloudy atmosphere to understand the processes determining the flux profile

357

ARM - TWP Science  

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PacificTWP Science PacificTWP Science TWP Related Links Facilities and Instruments Manus Island Nauru Island Darwin, AUS ES&H Guidance Statement Operations Science Field Campaigns Year of Tropical Convection Visiting the Site TWP Fact Sheet Images Information for Guest Scientists Contacts TWP Science New VSAT dish installed in the Tropical Western Pacific. New VSAT dish installed in the Tropical Western Pacific. The following are the basic science goals of the TWP component of the ARM Climate Research Facility: Determine the magnitude of the surface radiation budget terms and determine their spatial and temporal variability. Identify bulk and optical properties of clouds in the TWP and how these properties affect the radiation budget. Understand the linkages among sea surface temperature,

358

ARM - 2005 ARM Science Team Meeting  

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on Climate Change (IPCC) AR4 9:15 a.m. - 10:00 a.m. Jerry Harrington: Arctic Mixed-Phase Clouds and Ice Nuclei - A Delicate Balance 10:00 a.m. - 10:45 a.m. Michael...

359

ARM - 2008 ARM Science Team Meeting  

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and Tropical Cirrus 9:00 am - 9:20 am Xiaohong Liu: Evaluation of a New Mixed-phase Cloud Microphysics Parameterization with Single Column Model, CAPT Forecasts, and...

360

ARM - 2009 ARM Science Team Meeting  

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Evaluation of Shallow Convective Cloudiness Across European Centre for Medium-range Weather Forecasts (ECMWF) Model Cycles 9:50 am - 10:05 am Jerome Fast: The Aerosol...

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While these samples are representative of the content of NLEBeta,
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We encourage you to perform a real-time search of NLEBeta
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361

ARM - NSA Science  

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AlaskaNSA Science AlaskaNSA Science NSA Related Links Facilities and Instruments Barrow Atqasuk ES&H Guidance Statement Operations Science Field Campaigns Visiting the Site Images Information for Guest Scientists Contacts NSA Science Scientific objectives for the NSA/AAO site are provided below: Provide the comprehensive data sets necessary to develop and test continually improved algorithms for GCMs to describe radiative transfer and cloud processes at high latitudes; Specifically focus on development of algorithms to describe: radiative transfer within both the clear and cloudy atmosphere, especially at low temperatures; physical and optical behavior of water (ice) and land surfaces, both bare and snow-covered, especially during transitions from winter to summer and back; physical and optical behavior of ice and mixed phase clouds.

362

ARM - AMF Science Questions  

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AzoresAMF AzoresAMF Science Questions Azores Deployment AMF Home Graciosa Island Home Data Plots and Baseline Instruments Satellite Retrievals Experiment Planning CAP-MBL Proposal Abstract and Related Campaigns Science Questions Science Plan (PDF, 4.4M) Rob Wood Website Outreach Backgrounders English Version (PDF, 363K) Portuguese Version (PDF, 327K) AMF Posters, 2009 English Version Portuguese Version Education Flyers English Version Portuguese Version News Campaign Images AMF Science Questions Which synoptic-scale features dominate the variability in subtropical low clouds on diurnal to seasonal timescales over the NEA? Do physical, optical, and cloud-forming properties of aerosols vary with these synoptic features? How well can state-of-the-art weather forecast and climate models (run in forecast mode) predict the day-to-day variability of

363

National Science Bowl Update: Middle School Teams from Maryland...  

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

Science Bowl Update: Middle School Teams from Maryland and Indiana to Compete for National Championship on Monday National Science Bowl Update: Middle School Teams from Maryland...

364

ARM - Publications: Science Team Meeting Documents  

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Simulations of Mixed-Phase Altocumulus: An Evaluation of Remote Sensing Simulations of Mixed-Phase Altocumulus: An Evaluation of Remote Sensing Properties Versus Relative Ice/Water Content Sassen, K.(a) and Khvorostyanov, V.I.(b), University of Alaska Faibanks (a), Moscow Central Aerological Observatory (b) Mixed-phase clouds are acknowledged to be a harsh test of remote sensing data-based algorithms designed to derive microphysical and radiative properties. Yet, such clouds are globally ubiquitous. Using a 2-D cloud model with explicit microphysics and radiation, we evaluate the changes in mixed phase clouds caused by increasing ice content until glaciation occurs. The properties of the ice and water particle constituents are resolved independently, revealing the relative radiative contributions from the water phase source cloud versus the ice phase virga. Cloud contents are

365

ARM - Publications: Science Team Meeting Documents  

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Variability of Deep Convective Cloud Characteristics Across the TWP Regime Variability of Deep Convective Cloud Characteristics Across the TWP Regime Jensen, M.P.(a)(b), Del Genio, A.D.(b), Vogelmann, A.M.(c), Miller, M.A.(c), and Johnson, K.L.(c), Columbia University (a), NASA/GISS (b), Brookhaven National Laboratory (c) Deep convective clouds and their associated anvil clouds are the most obvious feature in satellite images of tropical latitudes due to their high albedo and low infrared brightness temperature.Despite the relative ease with which these cloud types are detected, the details of their radiative properties and how they are related to the hydrological and microphysical properties of the cloud system are not well understood. We present some preliminary analysis from the use of a combination of MODIS Cloud Products

366

ARM - Publications: Science Team Meeting Documents  

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Understanding the Effects of Uncertainties in Ice Processes, Entrainment Understanding the Effects of Uncertainties in Ice Processes, Entrainment and Updraft Velocities on the Relationship Between Cloud Optical Depth and Liquid Water Path at the NSA and SGP Sites Chen, Y.(a), Penner, J.E.(a), and Dong, X.(b), University of Michigan (a), University of North Dakota (b) The relationship between the cloud optical depth (tc) and the cloud liquid water path (LWP) inferred from surface observations of shortwave radiative fluxes and measured LWP shows significant variability. Our previous study1 used a warm-cloud microphysics model to explain the average relationship between the cloud optical depth (tc) and the cloud liquid water path (LWP). Here, we examine some of the processes that contribute to the observed variability in this relationship. We examine the possible effects of

367

ARM - Publications: Science Team Meeting Documents  

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Role of Subgrid Condensation in the Transition from Shallow to Deep Role of Subgrid Condensation in the Transition from Shallow to Deep Convection Xu, K.-M.(a) and Cheng, A.C.(b), NASA Langley Research Center (a), Hampton University (b) It is generally assumed that cloud-resolving models (CRMs) resolve the dynamics of clouds. It is also well known that condensation occurs at much finer spatial scales than those resolved by CRMs. How do CRMs treat the subgrid condensation? One is to drastically increase the resolution so that all condensation is resolved. The other is to parameterize the subgrid condensation with a statistical approach, as first proposed by Sommeria and Deardorff (1974). Unfortunately, most CRMs ignore the subgrid condensation all together. In this study, we propose to examine the role of subgrid condensation in the context of the transition from shallow convection to

368

ARM - Publications: Science Team Meeting Documents  

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

Spectral Composition and Quanta-to-Energy Ratio of Diffuse Spectral Composition and Quanta-to-Energy Ratio of Diffuse Photsynthetically Active Radiation under Diverse Sky Conditions Dye, D.G.(a) and Yasuoka, Y.(a,b), JAMSTEC-FRSGC (a), University of Tokyo (b) Data on the beam and diffuse components of photosynthetically active radiation (PAR, 400-700 nm) are often required for detailed process modeling of terrestrial photosynthesis and ecosystem-atmosphere carbon exchange. Such models typically require PAR data in quantum units (photosynthetic photon flux density) however PAR is often reported in energy units (irradiance). Reliable conversion of diffuse PAR data from energy to quantum units requires knowledge of how the quanta-to-energy ratio for diffuse PAR varies across a broad range of sky conditions that includes variations in cloudiness. This study employs a time-series of

369

ARM - Publications: Science Team Meeting Documents  

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

Shapes and Light Scattering Properties of Quasi-Spherical Ice Crystals Shapes and Light Scattering Properties of Quasi-Spherical Ice Crystals Nousiainen, T.P. and McFarquhar, G.M., University of Illinois The shapes and single-scattering properties of small, irregular, quasi-spherical ice crystals are studied using two-dimensional images measured by a Cloud Particle Imager in mid-latitude cirrus during the 2000 Cloud Intensive Operation Period conducted over the Atmospheric Radiation Measurement program's Southern Great Plains site. A statistical shape analysis of the ice crystal images is carried out to obtain size-dependent relative standard deviations of radius and correlation functions of logradius which together define the shape statistics of the sample ice crystals. The former describes the overall variation in the lengths of

370

ARM - Publications: Science Team Meeting Documents  

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

and Large-Scale Meteorology Benson, S., Mace, G.G., and Vernon, E.N., University of Utah Cirrus cloud properties are influenced by the large-scale meteorology in which they...

371

ARM - Publications: Science Team Meeting Documents  

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

Optical Display Sassen, K., and Mace, G.G., Department of Meteorology, University of Utah; Arnott, W.P., and Hallett, J., Desert Research Institute; Liou, K.N., and Takano, Y.,...

372

ARM - Publications: Science Team Meeting Documents  

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

Sassen, K.(a,b), Wang, Z.(a,b), Comstock, J.M.(c), and Platt, C.M.R.(d), University of Utah (a), University of Utah (b), Pacific Northwest National Laboratory (c), CSIRO (d)...

373

ARM - Publications: Science Team Meeting Documents  

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

Using ASTEX Data Lazarus, S.M., Krueger, S.K., and Frisch, A.S., University of Utah, National Oceanic and Atmospheric Administration-Environmental Technology Laboratory...

374

ARM - Publications: Science Team Meeting Documents  

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

Cloud Experiment (WB57 MidCiX) Mace, G.G.(a) and Heymsfield, A.J.(b), University of Utah (a), National Center for Atmospheric Research (b) Cloud property retrieval algorithms,...

375

ARM - Publications: Science Team Meeting Documents  

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

Rates Hinkelman, L.M.(a), Evans, K.F.(b), Clothiaux, E.E.(a), and Ackerman, T.P.(c), The Pennsylvania State University (a), University of Colorado (b), Pacific Northwest National...

376

ARM - Publications: Science Team Meeting Documents  

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

MISR Cloud Results: Global-to-Local Comparisons Davies, R.(a) and Horvath, A.(b), Jet Propulsion Laboratory, California Institute of Technology (a), University of Arizona (b)...

377

ARM - Publications: Science Team Meeting Documents  

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and Radiance Relationships Obtained From MISR and CERES Measurements Davies, R., Jet Propulsion Laboratory, California Institute of Technology This goal of this study is to...

378

ARM - Publications: Science Team Meeting Documents: Measuring...  

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Measuring Solar Irradiance from Space: The SOlar Radiation and Climate Experiment Harder, Jerry LASP University of Colorado Fontenla, Juan LASP University of Colorado Kopp, Greg...

379

ARM - Publications: Science Team Meeting Documents  

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

Effects of Non-Spherical Ice Crystal Shape on Solar Spectral Irradiances Wendisch, M.(a, b), Pilewskie, P.(b), Heymsfield, A.J.(c), Schmitt, C.(c), Yang, P.(d), Pommier, J.(b), and...

380

ARM - Publications: Science Team Meeting Documents  

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

Objective Criterion to Distinguish Seasons in Arctic Climate Objective Criterion to Distinguish Seasons in Arctic Climate Ivanova, K., Harrington, J.Y., Verlinde, J., Clothiaux, E.E., and Bahrmann, C.P., Pennsylvania State University Seasons are an important, though not always quantified, part of many climatologies. In particular, the breakdown of the annual cycle into seasons is important for cloud climatologies. Though one is always free to choose any averaging time-period one wants, it is usually best to choose time-periods during which the atmospheric forcing produces, perhaps, similar types of weather, or similar statistics. In Arctic research, breaking the year into seasons is also done to examine clouds synoptic-scale forcing of clouds, frontal frequencies, and so on. However, with few exceptions, the arctic seasons are defined commensurately with the

Note: This page contains sample records for the topic "arm science team" 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

ARM - Publications: Science Team Meeting Documents: Simultaneously  

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Simultaneously retrieving cloud optical depth and effective radius for Simultaneously retrieving cloud optical depth and effective radius for clouds with low liquid water path Min, Qilong State University of New York at Albany Duan, Minzheng State University of New York at Albany A new technique for simultaneously retrieving cloud optical depth and effective radius has been proposed. This approach is based on the angular distribution of scattered light in the forward scattering lobe of cloud drops. The angular distributions can be observed by multiple shadowband scans. Simulations demonstrate that accuracies for cloud optical depth, effective radius, and liquid water path are 2%, 10%, and 2g/m2, respectively for given possible instrument noise and uncertainties. Further, different measurement strategies have been tested and show good

382

ARM - Publications: Science Team Meeting Documents  

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

On Aerosol Optical Depth Determination from Zenith Measurements of On Aerosol Optical Depth Determination from Zenith Measurements of Scattered Light Polarization Degree Shukurov, A.Kh., Shukurov K.A., and Golitsyn G.S., A.M. Obukhov Institute of Atmospheric Physics RAS Investigations on relationships between variations of aerosol optical depth τaer and maximal polarization degree Pmax of scattered light (from part of a sky within 90 angular distance of Sun in its almucantar or vertical) are well known (see e.g. Coulson K.L. Izvestia Atmospheric Oceanic Physics. V.10, No.3, 1974). But these results show insufficient correlation coefficient R between Pmax and τaer. In the current work the results of measurements of variations P(h) dependence of polarization degree P on the Sun angular height () obtained from zenith measurements of scattered light

383

ARM - Publications: Science Team Meeting Documents  

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

Testing the Monte Carlo Independent Column Approximation with the NCAR Testing the Monte Carlo Independent Column Approximation with the NCAR Community Atmospheric Model Raisanen, P.(a), Barker, H.W.(b), and Cole, J.N.S.(c), Dalhousie University (a), Meteorological Service of Canada (b), Pennsylvania State University (c) The Monte Carlo Independent Column Approximation (McICA) is a relatively new method for computing radiative heating profiles within global climate models (GCMs). The McICA method segregates descriptions of surface-atmosphere optical structure from the radiative transfer solver thus allowing, for example, the statistical structure of cloud to be of arbitrary complexity. While McICA's flux and heating rate estimates are unbiased with respect to the full ICA, they contain conditional random errors that are uncorrelated from one GCM column to another and from one

384

ARM - Publications: Science Team Meeting Documents  

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

The Monte Carlo Approach for Light Scattering by Nonspherical Particles The Monte Carlo Approach for Light Scattering by Nonspherical Particles Evans, K.F., University of Colorado There is still no accurate method for computing light scattering by arbitrary shape particles of any size parameter. Scattering from particles with size parameters above roughly 50 may be calculated with ray tracing. Scattering for size parameters smaller than 10 to 20 may be computed with the discrete dipole approximation or the finite difference time domain method, though these methods are computationally very taxing for the larger size parameters. Scattering for the midrange of size parameters may be calculated with the T-matrix method for special shapes such as spheroids, cylinders, and even hexagonal columns with aspect ratios near unity, but

385

ARM - Publications: Science Team Meeting Documents  

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

guards, construction, local purchasing and travel arrangements, and instrument troubleshooting and repair. They also often serve as hands for researchers who are not located on...

386

ARM - Publications: Science Team Meeting Documents  

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

domain into 100 subdomains to obtain the radiative fluxes and heating rates for the en tire domain. Results indicate that the intermodel differences in cloud microphysics mainly...

387

ARM - Publications: Science Team Meeting Documents: Assessing...  

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

Li, Jaingnan Morcrette, Jean-Jacques European Centre for Medium-Range Weather Forecasts Pincus, Robert NOAA-CIRES Climate Diagnostics Center Raisanen, Petri Finnish...

388

ARM - Publications: Science Team Meeting Documents  

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

to identify parameterization-related errors in the short-range ( 7 days) forecasts of a climate model. The initial conditions of the state variables for each forecast...

389

ARM - Publications: Science Team Meeting Documents  

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

Iacono, M.J. (a), Mlawer, E.J. (a), Cady-Pereira, K. (a), Clough, S.A. (a), Stamnes, K. (b), and Bates, J.J. (c), Atmospheric and Environmental Research Inc. (a), Stevens...

390

ARM - Publications: Science Team Meeting Documents  

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

Radiometer, Balloon-Borne Sounding System and Global Positioning System J.C. Liljegren, B.M. Lesht, T. VanHove, and C. Rocken A Comparison of Surface- and Satellite-Derived Cloud...

391

ARM - Publications: Science Team Meeting Documents  

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

Correlations with Satellite Data: A Method for Contraining the Second Indirect Effect* J.E. Penner and C. Chuang A Comparison of Satellite and Ground-Based Retrievals of Cloud...

392

ARM - Publications: Science Team Meeting Documents  

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

Spectrum* Pilewskie, P., Fontenla, J., and Harder, J. A Processor To Get UV-A and UV-B Radiation Products from the ECMWF Forecast System* Morcrette, J. A Reduction in...

393

ARM - Selected Science Team Proposals - FY 2006  

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

of Cloud Microphysics and Indirect Aerosol Effects" Dr. Qilong Min, State University of New York at Albany: "Retrievals of Cloud Optical Properties and Photon Path Length...

394

ARM - Selected Science Team Proposals - FY 2002  

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

Data Steam - Renewal Proposal" Drs. Joseph J. MichalskyLee Harrison, State University of New York, Albany: "Spectral and Broadband Shortwave Radiometry and Analysis" Larry M....

395

ARM - Publications: Science Team Meeting Documents  

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

The TAO Buoy Solar Radiation Array - Implementation, Calibration, and Results Reynolds, R.M.(a), McPhaden, M.(b), and Freitag, P.(b), Brookhaven National Laboratory (a), NOAA...

396

ARM - Publications: Science Team Meeting Documents  

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

that Accounts for Subgrid-scale Cloud Variability A Study of Atmospheric Absorption of Solar Radiation Using Cloud Fields Derived from a Cloud Resolving Model An Intercomparison...

397

ARM - Publications: Science Team Meeting Documents  

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

Near Real-Time Geographic Representation of Solar Radiation Measurement Data for the Southern Great Plains Network Brady, E., Gray-Hann, P., Anderberg, M.H.L., Wilcox, S.M., and...

398

ARM - Publications: Science Team Meeting Documents  

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

Between 3-D Model Computations and Spectral and Broadband Observations of Column Solar Radiation Absorption During ARESE II O'Hirok, W. (a), Gautier, C. (a), Ellingson,...

399

ARM - Publications: Science Team Meeting Documents  

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

ScaRaB, GOES-8, Aircraft, and Surface Observations of the Absorption of Solar Radiation by Clouds Pope, S.K. (a), Valero, F.P.J. (a), and Collins, W.D. (b), Scripps Institution of...

400

ARM - Publications: Science Team Meeting Documents  

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

Relative Importance of Size Distribution and Liquid Water Path to Solar Radiation in the Presence of Continental Stratus Sengupta, M.(a), Ackerman, T.P.(a), and Clothiaux, E.E.(b),...

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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

ARM - Publications: Science Team Meeting Documents  

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

Generalized Convective Available Potential Energy (GCAPE) has been developed at Colorado State University. This particular algorithm differs from other CAPE-determining...

402

ARM - Publications: Science Team Meeting Documents  

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

variational data assimilation (4DVAR). We found that the assimilation of slant wet delay data resulted in the enhancement of the three-dimensional gradient of thermodynamic fields...

403

ARM - Publications: Science Team Meeting Documents  

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

Remote Sensing of Three-Dimensional Inhomogeneous Cirrus Clouds: Application to Climate Research Liou, K.N. (a), Ou, S.C. (a), Rolland, P. (a), Gu, Y. (a), Mace, G.G. (b), and...

404

ARM - Publications: Science Team Meeting Documents  

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

A Comparison of Aerosol Scattering Parameters Obtained by Ground-Based Remote Sensing and In-Situ Profile Flights Ricchiazzi, P.J.and Gautier, C., University of California, Santa...

405

ARM - Publications: Science Team Meeting Documents  

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

Space-Borne Remote Sensing of High-latitude Surface Radiative Properties Berque, J., Lubin, D., and Somerville, R.C.J., Scripps Institution of Oceanography, University of...

406

ARM - Publications: Science Team Meeting Documents  

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

Testing a CCN Remote Sensing Method Ghan, S.(a), Rissman, T.(b), Elleman, R.(c), Covert, D.(c), Ferrare, R.(d), and Turner, D.D.(a), Pacific Northwest National Laboratory (a),...

407

ARM - Publications: Science Team Meeting Documents  

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

SIRTA: A French Observation Site for Atmospheric Remote Sensing Haeffelin, M., Chepfer, H., Delaval, A., Drobinski, P., Protat, A., and Sauvage, L., Institut Pierre Simon Laplace,...

408

ARM - Publications: Science Team Meeting Documents  

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

Comparison of In-Situ, Airborne and Surface Remote Sensing of Cloud Droplet Size and Liquid Water Path Over SGP CART During the Aerosol IOP Pilewskie, P.(a), Feingold, G.(b),...

409

ARM - Publications: Science Team Meeting Documents  

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

Size DeSlover, D.H.(a), Turner, D.D.(b), and Knuteson, R.O.(a), University of Wisconsin-Madison(a) Pacific Northwest National Laboratory(b) Thirteenth Atmospheric Radiation...

410

ARM - Publications: Science Team Meeting Documents  

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

Radiative Flux Profiles in the Atmospheric Boundary Layer Arion, D.N. Stochastic Radiation Transport for Climate Models A B C D E F G H I J K L M N O P Q R S T U V W X Y Z B...

411

ARM - Publications: Science Team Meeting Documents  

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

saturation vapor pressure with temperature. In contrast to the simplicity of the thermodynamics, the radiative physics which underlies water vapor feedback is quite complex,...

412

ARM - Publications: Science Team Meeting Documents  

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

site. We illustrate the high precision CO2 and CO2 isotope monitoring system at the 60 m tower of the Central Facility. Preliminary results will be shown from the (1) initial...

413

ARM - Publications: Science Team Meeting Documents  

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

of smaller water droplets (Twomey effect). The impact as a negative radiative forcing (cooling) at the surface and top of atmosphere (TOA) is generally well accepted but the...

414

ARM - Publications: Science Team Meeting Documents  

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

process. The first is what we term a "perfect model" method which addresses procedural questions such as: nudging, interpolation of data, forecast times and useful...

415

ARM - Publications: Science Team Meeting Documents  

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

Simulation of the Intercontinental Transport, Aging, and Removal of a Boreal Fire Smoke Plume Over Oklahoma Ghan, S.(a), Chapman, E.(a), Easter, R.(a), Reid, J.(b), and Justice,...

416

ARM - Publications: Science Team Meeting Documents  

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

leads to bulk photon transport by anomalous diffusion which in turn nicely explains the trends in mean pathlength (from oxygen A-band) versus cloud optical depth observed by...

417

ARM - Publications: Science Team Meeting Documents  

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

measured brightness temperature. The satellite results, retrieved from GOES visible, solar-infrared, and infrared radiances, are averaged in a 0.5 x 0.5 box centered on the...

418

ARM - Publications: Science Team Meeting Documents  

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

and in Low Sun Conditions* Heck, P.W., Rapp, A.D., Minnis, P., Smith, Jr., W.L., and Nguyen, L. An Integrated Algorithm for Retrieving Low-Level Stratus Cloud Microphysical...

419

ARM - Publications: Science Team Meeting Documents  

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

Sun Conditions Heck, P.W.(a), Rapp, A.D.(a), Minnis, P.(b), Smith, Jr., W.L.(b), and Nguyen, L.(b), Analytical Services & Materials, Inc. (a), NASA Langley Research Center (b)...

420

ARM - 2007 Science Team Meeting Presentations  

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

oud-Aerosol-Radiation- Chemistry (PDF, 3,411KB) V. Ramanathan, C. Corrigan, D. Kim, H. Nguyen, M. Ramana, and G. Roberts Unmanned Aircraft Systems (UAS): Potential Benefits and...

Note: This page contains sample records for the topic "arm science team" 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

ARM - Publications: Science Team Meeting Documents  

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

vertical profiles of the vertical velocity variance and its third moment, cumulus kinetic energy, model prognostic variables' variances and fluxes, their budgets, as well as...

422

ARM - Publications: Science Team Meeting Documents  

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

with Sunphotometer and MODIS Results Diner, D.J., Martonchik. J.V., Abdou, W.A., Kahn, R.A., Gaitley, B.J., and Crean, K.A., Jet Propulsion Laboratory, California Institute of...

423

ARM - Publications: Science Team Meeting Documents  

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

Radiation (SOAR) Program: A Review of Instrumentation and Results to Date Reynolds, R.M. (a), MIller, M.A. (a), Bartholomew, M.J. (a), and Yoneyama, K. (b), Brookhaven...

424

ARM - Publications: Science Team Meeting Documents  

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

P. (a), Gore, W.J. (a), Rabbette, M. (b), Pommier, J. (b), Howard, S. (c), and Bergstrom, R. (b), NASA Ames Research Center (a), Bay Area Environmental Research Institute (b),...

425

ARM - Publications: Science Team Meeting Documents  

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

Objectives K. Stamnes and E. Leontieva The Optical Properties of Equatorial Cirrus in the Pilot Radiation Observation Experiment C.M.R. Platt, S.A. Young, P. Manson, G.R....

426

ARM - Publications: Science Team Meeting Documents  

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

Analysis of Ground-Based Microwave and Infrared Radiance Observations During the Pilot Radiation Observation Experiment Westwater, E.R., Han, Y., Churnside, J.H. and...

427

ARM - Publications: Science Team Meeting Documents  

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

degrees during few minutes, which can be considered a direct manifestation of the greenhouse effect. Note: This is the poster abstract presented at the meeting; an extended version...

428

ARM - Publications: Science Team Meeting Documents  

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

Retrieval of Ice Water Path Using Thermal Channels Mitchell, D.L. (a), d'Entremont, R.P. (b), Stackhouse, P.W., Jr. (c), and Heymsfield, A.J. (d), Desert Research Institute (a),...

429

ARM - Publications: Science Team Meeting Documents  

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

s, the asymmetry parameter, g, and the volume extinction coefficient, e, in water, mixed-phase and ice clouds for all hydrometeors larger than 4-m diameter. The principle of...

430

ARM - Publications: Science Team Meeting Documents  

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

lifting condensation level, cloud-top heights near the freezing level, a general lack of ice-phase hydrometeors and often precipitation reaching the surface. They are thought to...

431

ARM - Selected Science Team Applications - FY 2009  

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

University: "Ice Nuclei Relation to Aerosol Properties: Data Analysis and Model Parameterization for IN in Mixed-Phase Clouds" Dr. David Randall, Colorado State University:...

432

ARM - Publications: Science Team Meeting Documents  

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

clouds. There is an ambiguity, however, in defining the water vapor pressure for mixed-phase clouds which may exist in the temperature range from -40oC to 0oC. Various...

433

ARM - Selected Science Team Applications - FY 2008  

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

Fraction and Ice Crystal Number Concentration Parameterizations for Ice and Mixed Phase Clouds, and Their Application for ClimateCloud Studies with a Focus on the aerosol...

434

ARM - Selected Science Team Proposals - FY 2003  

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

Study of Arctic Cloud and Aerosol Using AERI Data: Radiative Properties, Thermodynamic Phase, and a Search for the Indirect Aerosol Effect" NEW-Dr. Greg McFarquhar, University of...

435

ARM - Publications: Science Team Meeting Documents  

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

and spring mixed-phase clouds. This explicit model has been used to develop a parameterization of the Arctic low-level clouds such as clear-sky precipitation, ice fog and...

436

ARM - Publications: Science Team Meeting Documents  

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

both are optically thin with optical depths generally less than about 0.5. Presently, retrieval of such information as optical thickness and effective particle size by...

437

ARM - Publications: Science Team Meeting Documents  

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

wavelength radiation in rain. It is often possible, however, to extract quantitative information about precipitation from MMCR measurements. This poster will discuss different...

438

ARM - Publications: Science Team Meeting Documents: Retrievals...  

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

radar (MMCR) and oxygen-A band. The oxygen-A band measurement with photon path length information provides additional constraints on the radar retrieval, resulting more...

439

ARM - Publications: Science Team Meeting Documents  

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

to find cases that meet their requirements. Researchers use this data to create an information landscape and gain insight into their problem. To address this data retrieval,...

440

ARM - Publications: Science Team Meeting Documents  

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

Retrieving Aerosol Size Distribution Information from Direct Beam Measurements Gianelli, S.M.(a,b), Carlson, B.E.(b), and Lacis, A.A.(b), Columbia University(a), NASA-GISS(b) An...

Note: This page contains sample records for the topic "arm science team" 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

ARM - Publications: Science Team Meeting Documents  

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

wave by distributions of randomly oriented spheroidal particles, and incorporate this information into radiative transfer codes. Implications to Global Climate Models and...

442

ARM - Publications: Science Team Meeting Documents  

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

in Petten, details of the cloud formation process were studied in a cloud chamber. The information from the field campaigns is used to improve routine remote sensing retrieval...

443

ARM - Publications: Science Team Meeting Documents  

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

The Site and Computer Access Request System Doty, K.J.(a), Eagan, R.(b), Sisterson, D.L.(b), and Wagener, R.(a), Brookhaven National Laboratory (a), Argonne National Laboratory (b)...

444

ARM - Publications: Science Team Meeting Documents  

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

client and server * GhostView postscript utilties * HyperSnapDX (screen-snap utility) * Java Development Kit * National Instruments NI-DAQ libraries * netcdf utilities * Norton's...

445

ARM - Publications: Science Team Meeting Documents: Abstracts...  

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

Lidar Measurements versus Model Simulations Beljaars, A. Validation of Global Weather Forecast and Climate Models over the North Slope of Alaska* Benson, S. Evaluation of Cirrus...

446

ARM - Publications: Science Team Meeting Documents  

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

Cloud Fraction and Radiation Fluxes between the Surface Observation and the NCEP NWP Forecast* Dong, X. A Comparison of the Global Surveys of High, Mid, and Low Clouds from...

447

ARM - Publications: Science Team Meeting Documents  

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

DOE National User Facility in the Tropical Western Pacific Jones, L.(a), Sisterson, D.L.(b), Porch, W.(a), Mather, J.H.(c), and Long, C.N.(c), Los Alamos National Laboratory (a),...

448

ARM - Publications: Science Team Meeting Documents  

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

Generating Sub-Grid Scale Optical Structure for GCM Calculations of Radiative Transfer Raisanen, P.(a), Barker, H.W.(a), Khairoutdinov, M.F.(b), and Randall, D.A.(b),...

449

ARM - Publications: Science Team Meeting Documents  

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

Generating Sub-Grid Scale Cloud Structure for GCM Calculations of Precipitation Pincus, R.(a) and Klein, S.A.(b), NOAA-CIRES Climate Diagnostics Center (a), NOAAPrinceton GFDL (b)...

450

ARM - Publications: Science Team Meeting Documents  

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

of 0.06, whereas for the land retrievals the mean difference is -0.02 in 2002 and an order of magnitude smaller in 2001 and an RMS difference in both years of 0.10. For...

451

ARM - Publications: Science Team Meeting Documents  

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

changes in stratospheric water vapor, which point to problems with current treatment of absorption and emission by stratospheric water vapor. Forster and Shine 1999, using a...

452

ARM - Publications: Science Team Meeting Documents  

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

(TDM&1;) with Optical Particle Counter (OPC), rapid size distribution by Differential Mobility Analyzer (DMA)*, particle refractive index (OPC+DMA)*, particle hygroscopicity by...

453

ARM - Publications: Science Team Meeting Documents  

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

Parameterization of the Longwave Radiative Effects of Mineral Aerosols Dufresne, J.L. (a,b), Gautier,C. (a), and Ricchiazzi,P. (a), ICESS, University California Santa Barbara (a),...

454

ARM - Publications: Science Team Meeting Documents  

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

Aerosols, Climate and Satellite Based Retrieval of Aerosol Optical Depth Chylek, P., Henderson, B., and Davis, A.B., Los Alamos National Laboratory, Space and Remote Sensing...

455

ARM - Publications: Science Team Meeting Documents  

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

An Assessment of the Change in Temperature Structure Associated with Carbonaceous Aerosols Penner, J.E. (a), Zhang, S.Y. (a), and Chuang, C.C. (b), University of Michigan (a),...

456

ARM - Publications: Science Team Meeting Documents  

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

Raman Lidar Profiling of Aerosols and Water Vapor Over the Southern Great Plains Ferrare, R.A.(a), Turner, D.D.(b), Clayton, M.B.(c), Brasseur, L.H.(c), Tooman, T.P.(d), Goldsmith,...

457

ARM - Publications: Science Team Meeting Documents  

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

The ARMLBNL Carbon project is making a coordinated suite of carbon concentration, isotope, and flux measurements to support a range of scaling and integration exercises,...

458

ARM - Publications: Science Team Meeting Documents  

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

This comparison focuses primarily on differences in cloud base height and percentage clear sky that are reported by the Micropulse Lidar (MPL), Millimeter Cloud Radar...

459

ARM - Publications: Science Team Meeting Documents  

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

Pixel Collocation Technique for Refined Cloud Amounts, Optical Depths, Pixel Collocation Technique for Refined Cloud Amounts, Optical Depths, Cloud Heights and Liquid Water Path Intercomparison Genkova, I.(a), Long, C.N.(a), Heck, P.W.(b), and Minnis, P.(c), Pacific Northwest National Laboratory (a), University of Wisconsin (b), NASA Langley (c) One of the problems inherent in satellite and surface data comparisons is the spatial matching. Often there is a parallax error due to the GOES view zenith angle or simply due to navigation imperfections. This may cause a shift in the GOES image, so the pixel reported for particular latitude and longitude may be up to 3 pixels aside than the actual location. We explore the possibility of collocating GOES images by matching the surface retrieved CF and OD and apply the shifts to all other GOES retrieved cloud

460

ARM - Publications: Science Team Meeting Documents  

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

Radiometer Measurements and Retrievals Using Time Series Analyses* Effect of Stratus on Solar Radiation: A Study using Millimeter Wave Cloud Radar and Microwave Radiometer Data...

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461

ARM - Publications: Science Team Meeting Documents: Interactions...  

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

Radiation in the Multiscale Modelling Framework Cole, Jason Meteorological Service of Canada Barker, Howard Meteorological Service of Canada Khairoutdinov, Marat Colorado State...

462

ARM - Publications: Science Team Meeting Documents: Response...  

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

variations in cloud droplet size distribution Barker, Howard Meteorological Service of Canada Cole, Jason Meteorological Service of Canada Marshak, Alexander NASA Goddard Space...

463

ARM - Publications: Science Team Meeting Documents  

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

from Millimeter-Wave Radar Data Kogan, Z.N.(a), Mechem, D.B.(b), and Kogan, Y.L.(c), Cooperative Institute for Mesoscale Meteorological Studies (a), University of Oklahoma (b)...

464

ARM - Publications: Science Team Meeting Documents  

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

on Cloud Radar Data and LES Simulations Kogan, Z.N., Mechem, D.B., and Kogan, Y.L., Cooperative Institute for Mesoscale Meteorological StudiesUniversity of Oklahoma Twelfth...

465

ARM - Publications: Science Team Meeting Documents  

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

DeSlover, D.H.(a) and Turner, D.D.(b), University of Wisconsin - Madison; Cooperative Institute for Meteorological Satellite Studies (a), Pacific Northwest National...

466

ARM - Publications: Science Team Meeting Documents  

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

Micropulse Lidar Slant Sensing Retrieval of Aerosol Optical Properties Powell, D.M., and Reagan, J.A., University of Arizona; Spinhirne, J.D., National Aeronautics and Space...

467

ARM - Publications: Science Team Meeting Documents  

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

A High Spectral Resolution Lidar for Long-Term Arctic Deployment Eloranta, E. W., Razenkov, I. A., Garcia, J. P., and Hedrick, J. P., University of Wisconsin-Madison Thirteenth...

468

ARM - Publications: Science Team Meeting Documents  

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

THOR Cloud Thickness from Offbeam Lidar Returns Cahalan, R.F.(a), McGill, M.(a), Kolasinski, J.(a), Varnai, T.(b), and Yetzer, K.(c), NASAGoddard Space Flight Center (a),...

469

ARM - Publications: Science Team Meeting Documents  

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

Photon Counting Issues for the CART Raman Lidar Turner, D.D., Pacific Northwest National Laboratory; Whiteman, D.N., NASAGoddard Space Flight Center Eighth Atmospheric Radiation...

470

ARM - Publications: Science Team Meeting Documents  

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

NASAGSFC Scanning Raman Lidar Measurements of Water Vapor and Cirrus Clouds During WVIOP2000 and AFWEX Whiteman, D.N.(a), Evans, K.D.(b), Di Girolamo, P.(c), Demoz, B.B.(b),...

471

ARM - Publications: Science Team Meeting Documents  

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

Development of a Solar Blind Micropulse Raman Lidar for Boundary Layer Water Vapor Measurements Whiteman, D.N., Mathur, S., Nam, M., Hwang, I.H., and Prasad, C.R., National...

472

ARM - Publications: Science Team Meeting Documents  

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

Cloud Thickness from Offbeam Returns - Thor Lidar Cahalan, R.F., Kolasinski, J., and McGill, M., NASAGoddard, Laboratory for Atmospheres Twelfth Atmospheric Radiation Measurement...

473

ARM - Publications: Science Team Meeting Documents  

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

Lidar Multiple Scattering Determinations of Particle Size in Cirrus Clouds Eloranta, E.W. and Kuehn, R.E., University of Wisconsin-Madison Twelfth Atmospheric Radiation Measurement...

474

ARM - Publications: Science Team Meeting Documents  

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

Sensing of Cirrus Cloud Parameters Using AVHRR and MODIS Data Coupled With Radar and Lidar Measurements Ou, S.C.(a), Liou, K.N.(a), Takano, Y.(a), Mace, G.G.(b), Sassen, K.(b),...

475

ARM - Publications: Science Team Meeting Documents  

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

High Spectral Resolution Lidar Measuremetns of Ice Water Content: Approach and Initial Progress Eloranta, E.W., Kuehn, R.E., and Holz, R.E, University of Wisconsin-Madison Eleventh...

476

ARM - Publications: Science Team Meeting Documents  

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

AERI and Raman Lidar Cirrus Cloud Optical Depth Retrieval to Validate Aircraft-Based Cirrus Measurements DeSlover, D.H.(a), Knuteson, R.O.(a), Turner, D.D.(b), Whiteman, D.N.(c),...

477

ARM - Publications: Science Team Meeting Documents  

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

path (LWP) data from the microwave water radiometer (MWR) at the central facility of the Oklahoma Cloud and Radiation Testbed (CART) site was analyzed by Wiscombe et al. (1995)....

478

Instrumentation Overview ARM Climate Research Facility 18th Annual...  

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Overview ARM Climate Research Facility 18th Annual ARM Science Team Meeting Jimmy Voyles Voyles STM.2008 Presentation Outline Voyles STM.2008 Presentation Outline * Program Science...

479

Registration Now Open for 2013 Science Bowl Teams  

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

Participating Teams Compete in Science, Technology, Engineering, and Math for Opportunity to Travel to Washington, DC for the National Science Bowl

480

ARM - Facility News Article  

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

March 31, 2006 [Facility News] March 31, 2006 [Facility News] New Chief Scientist Leads Annual ARM Science Team Meeting Bookmark and Share Dr. Warren Wiscombe begins his presentation by introducing the members of his "Chief Scientist team"-a new approach for leading the ARM Science Team. Dr. Warren Wiscombe begins his presentation by introducing the members of his "Chief Scientist team"-a new approach for leading the ARM Science Team. With a new Chief Scientist at the helm, just over 300 ARM scientists and ARM infrastructure staff took part in the 16th ARM Science Team meeting held in Albuquerque, New Mexico, on March 27-31, 2006. After an initial day of focused meetings among the ARM Working Groups, Dr. David Thomassen, Acting Associate Director of DOE's Office of Biological and Environmental

Note: This page contains sample records for the topic "arm science team" 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.


481

ARM - Events Article  

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

User Facility Featured at Atmospheric System Research Science Team Meeting During Tuesday afternoon's plenary session, Dave Turner provided an overview of the ARM Facility and...

482

ARM STM Plenary: CS Report  

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

8 8 ARM Science Team Meeting 2008 Warren Wiscombe ARM Chief Scientist Brookhaven National Lab Mar 2008 ARM Plenary 2 ARM Chief Scientist Team ARM Chief Scientist Team Ric Cederwall Andy Vogelmann Sharon Zuhoski Yangang Liu Pavlos Kollias Mar 2008 ARM Plenary 3 Submit your... Submit your... science highlights (www.arm.gov) poster PDFs (esp if you win CS Design Award) feedback in text boxes on ARM web pages Also... vote for People's Choice Poster talk to our Thu morning speakers Mar 2008 ARM Plenary 4 Mar 2008 ARM Plenary 5 Existing Existing * CLOWD (Clouds with Low Optical Depth) * BBHRP (BroadBand Heating Rate Profile) * Radar Focus Groups Focus Groups New New * Vertical Velocity for Climate Modelers * Longwave/Microwave * Surface Fluxes Mar 2008 ARM Plenary 6 ARM ARM ' ' s s two fundamental science questions

483

Climate-Science Computational Development Team: The Climate End...  

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Argonne National Laboratory Robert Jacob, Argonne National Laboratory Climate-Science Computational Development Team: The Climate End Station II PI Name: Warren Washington...

484

Charter for the ARM Climate Research Facility Science Board  

Science Conference Proceedings (OSTI)

The objective of the ARM Science Board is to promote the Nations scientific enterprise by ensuring that the best quality science is conducted at the DOEs User Facility known as the ARM Climate Research Facility. The goal of the User Facility is to serve scientific researchers by providing unique data and tools to facilitate scientific applications for improving understanding and prediction of climate science.

Ferrell, W

2013-03-08T23:59:59.000Z

485

ARM - Collaborations  

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

govScienceCollaborations govScienceCollaborations Science Research Themes Research Highlights Journal Articles Collaborations Atmospheric System Research (ASR) ARM Science Team Meetings User Meetings Annual Meetings of the Atmospheric System Research (ASR) Science Team and Fall Working Groups Accomplishments Read about the 20 years of accomplishments (PDF, 696KB) from the ARM Program and user facility. Performance Metrics ASR Metrics 2009 2008 2007 2006 Collaborations The ARM Climate Research Facility collaborates extensively with other U.S. Department of Energy (DOE) programs and laboratories, agencies, universities, and private firms in gathering and sharing data. This collaborative approach allows ARM to leverage its investment in instruments, sites, data, and science and to gain the knowledge necessary

486

MR Instrument Team - ORNL Neutron Sciences  

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

MR-Instrument Team MR-Instrument Team MR instrument team MR Team (left to right): Valeria Lauter, Lead Instrument Scientist, Primary Contact Artur Glavic, Instrument Scientist Hailemariam Ambaye, Scientific Associate Rick Goyette, Scientific Associate Lead Instrument Scientist: Dr. Valeria Lauter Valeria Lauter Beam line 4A's lead instrument scientist is Valeria Lauter. Valeria received her PhD in Experimental and Theoretical Solid State Physics from the Joint Institute for Nuclear Research in Dubna, Russia. Her previous work has been as a Research Scientist at the Technical University of Munich, Germany; Research Scientist at the University of Konstanz, Germany; Visiting Scientist at the Institute Laue-Langevin in Grenoble, France; Research Scientist at the Laboratoire de Magnetisme CNRS in Grenoble,

487

ARM Orientation Workshop  

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

Finding " Finding " " Stuff Stuff " " from from ARM Web Site and Data ARM Web Site and Data Archive Archive Orientation for new Science Team Members Topics Topics Navigating ARM web site Navigating ARM web site - - finding ARM information finding ARM information Demo of Archive access Demo of Archive access - - Finding and requesting ARM data files Finding and requesting ARM data files - - (with web shopping cart interface) (with web shopping cart interface) Other Archive access options Other Archive access options - - Brief logical comparison Brief logical comparison - - (additional details as requested) (additional details as requested) Other documentation topics Other documentation topics - - (per user interest and time availability) (per user interest and time availability)

488

ARM - Events Article  

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

, 2007 [Events] , 2007 [Events] Climate Scientists Cool Their Heels at Science Team Meeting in Monterey Bookmark and Share Nearly 300 participants from countries as far away as Japan, Australia, and Finland attended the 2007 ARM Science Team Meeting. Nearly 300 participants from countries as far away as Japan, Australia, and Finland attended the 2007 ARM Science Team Meeting. A spring mix of sunny skies and stormy weather provided an appropriate setting for the Seventeenth Atmospheric Radiation Measurement (ARM) Program Science Team Meeting, held March 26 through March 30 in Monterey, California. Held annually since 1990, this meeting brings together ARM scientists, ARM infrastructure staff, and user facility researchers to review program progress and plan future activities.

489

ARM - Events Article  

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

March 29, 2012 [Events] March 29, 2012 [Events] ARM Attends Third Annual Atmospheric System Research Science Team Meeting Bookmark and Share The ARM Climate Research Facility provided information about the user facility, including a live data kiosk, public information materials, and banners showcasing the three fixed ARM sites. The ARM Climate Research Facility provided information about the user facility, including a live data kiosk, public information materials, and banners showcasing the three fixed ARM sites. The third annual Atmospheric System Research (ASR) Science Team Meeting, held March 12-16 in Arlington, Virginia, brought together members of ASR and the ARM Climate Research Facility. ASR and ARM collaborate through the use of ARM facilities for targeted field campaigns and data gathered at ARM

490

NETL: Science Bowl Information - West Virginia - Teams and Coaches  

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

Teams and Coaches Teams and Coaches Facebook Visit us on Facebook CLICK ON IMAGE TO SEE LARGER VIEW SuGO Bot competition. SuGO Bot competition. We're excited you're here to participate in the National Science Bowl® competition. Below are some links to help you prepare your team to compete. Good luck! We hope to see you at the regional competition. General Information Some information about this year's regional competition can be found in a letter which was sent out to schools in the region. Click here to read it. Local competition schedule by RESA and contact information About the Competition A complete set of rules for the 2014 Competition 2014 Rules Sample Questions - Use these sets of sample questions from The National Science Bowl website to test and practice your science knowledge.

491

2010 Atmospheric System Research (ASR) Science Team Meeting Summary  

SciTech Connect

This document contains the summaries of papers presented in poster format at the March 2010 Atmospheric System Research Science Team Meeting held in Bethesda, Maryland. More than 260 posters were presented during the Science Team Meeting. Posters were sorted into the following subject areas: aerosol-cloud-radiation interactions, aerosol properties, atmospheric state and surface, cloud properties, field campaigns, infrastructure and outreach, instruments, modeling, and radiation. To put these posters in context, the status of ASR at the time of the meeting is provided here.

Dupont, DL

2011-05-04T23:59:59.000Z

492

ARM Orientation: Overview and History  

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

ARM Orientation: ARM Orientation: Overview and History Warren Wiscombe ARM Chief Scientist Brookhaven & NASA ARM ARM Atmospheric Radiation Measurement Atmospheric Radiation Measurement 2 Mar 2006 ARM Orientation You want me to be Chief Scientist? Can you believe this guy? ARM ARM Atmospheric Radiation Measurement Atmospheric Radiation Measurement 3 Mar 2006 ARM Orientation ARM in a nutshell ARM in a nutshell * * Largest global change research program Largest global change research program funded by the U.S. Department of Energy funded by the U.S. Department of Energy ($44M/yr; ~ ($44M/yr; ~ $10M/yr fo $10M/yr fo r Science Team r Science Team ) ) * * Created to improve cloud and radiation Created to improve cloud and radiation physics and cloud simulation capabilities in physics and cloud simulation capabilities in

493

ARM - Events Article  

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

April 12, 2011 [Events, Facility News] April 12, 2011 [Events, Facility News] ARM Participates in Second Annual Atmospheric System Research Science Team Meeting Bookmark and Share In front of her poster, Alice Cialella from Brookhaven National Laboratory speaks to ARM Aerial Facility Program Manager Rickey Petty. In front of her poster, Alice Cialella from Brookhaven National Laboratory speaks to ARM Aerial Facility Program Manager Rickey Petty. ARM Facility staff participated in the second annual Atmospheric System Research (ASR) Science Team Meeting, held March 27-April 1 in San Antonio, Texas. ASR and ARM collaborate through the use of ARM facilities for targeted field campaigns and data gathered at ARM sites for climate model improvement. The annual meeting provides an opportunity for science and

494

ARM - Publications: Science Team Meeting Documents: An Arctic Springtime  

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

An Arctic Springtime Mixed-Phase Cloudy Boundary Layer observed during An Arctic Springtime Mixed-Phase Cloudy Boundary Layer observed during SHEBA Zuidema, Paquita RSMAS/MPO University of Miami Han, Yong NASA Goddard Space Flight Center Intrieri, Janet NOAA/Environmental Technology Laboratory Key, Jeffrey Boston University Lawson, Paul SPEC Inc. Matrosov, Sergey NOAA/Environmental Technology Laboratory Shupe, Matthew CIRES/NOAA/ETL Uttal, Taneil NOAA/Environmental Technology Laboratory The microphysical characteristics, radiative impact, and lifecycle of a long-lived, surface-based mixed-layer, mixed-phase cloud with an average temperature of approximately -20 C are presented and discussed. The cloud was observed during the Surface Heat Budget of the Arctic experiment from May 1 through May 10, 1998. Vertically-resolved properties of the liquid

495

ARM - Publications: Science Team Meeting Documents: Influence of  

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

Influence of Atmospheric Stability on the Cloud Drop Effective Radius Influence of Atmospheric Stability on the Cloud Drop Effective Radius Determined by Ground-based Remote Sensing Kim, Byung-Gon Princeton University Miller, Mark Brookhaven National Laboratory Min, Qilong State University of New York at Albany Schwartz, Stephen Brookhaven National Laboratory Aerosol indirect radiative forcing of climate change (enhancement of cloud drop number concentration and by anthropogenic aerosols and resultant change in cloud albedo, commonly denoted the aerosol first indirect effect or "Twomey effect") is considered the most uncertain forcing of climate change over the industrial period, despite numerous studies demonstrating such modification of cloud properties and several studies quantifying resulting changes in shortwave radiative fluxes. We have previously used

496

ARM - Publications: Science Team Meeting Documents: Evaluation of mesoscale  

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

Evaluation of mesoscale model cloud simulations of the March 2000 IOP Evaluation of mesoscale model cloud simulations of the March 2000 IOP Tselioudis, George NASA/Goddard Institute for Space Studies A suite of mesoscale models was used to produce month-long runs of the March 2000 SGP IOP. The model cloud fields were evaluated against satellite and in-situ observations, using both monthly statistics of cloud properties and instantaneous cloud property distributions. It was found that compared to satellite retrievals models tend to overestimate cloud optical thickness in all dynamic regimes. The reasons for the differences in satellite and model cloud fields were investigated. Preliminary results indicate that the large model optical depths may be caused by an overestimate of cloud ice water amounts in the model simulations. Part of the differences, however,

497

ARM - Publications: Science Team Meeting Documents: Accounting for  

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

Accounting for partially cloud-filled pixels to improve the retrieval of Accounting for partially cloud-filled pixels to improve the retrieval of cloud properties using high-resolution data Nguyen, Louis NASA Langley Minnis, Patrick NASA Langley Research Center Khaiyer, Mandana Analytical Services and Material, Inc. Nordeen, Michele AS&M/NASA Langley Heck, Patrick University of Wisconsin Palikonda, Rabindra Analytical Services & Materials Inc, Comstock, Jennifer Pacific Northwest National Laboratory Long, Chuck Pacific Northwest National Laboratory Partially cloud-filled pixels can be a significant problem for remote sensing of cloud properties. Generally, the optical depth and effective particle sizes are often too small or too large, respectively, when derived from radiances that are assumed to be overcast but contain radiation from

498

ARM - Publications: Science Team Meeting Documents: Nighttime cirrus  

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

Nighttime cirrus detection using AIRS radiances and total column Nighttime cirrus detection using AIRS radiances and total column precipitable water Kahn, Brian Jet Propulsion Laboratory Liou, Kuo-Nan UCLA A method of cirrus detection at nighttime is presented that utilizes 3.8 and 10.4 m infrared (IR) window brightness temperature differences (dBT) and total column precipitable water (PW) measurements. This technique is applied to the Atmospheric Infrared Sounder (AIRS) and Advanced Microwave Sounding Unit A (AMSU-A) instrument suite onboard EOS-Aqua, where dBT is determined from sets of carefully selected AIRS window channels, while PW is derived from the synergistic AIRS and AMSU-A water vapor retrievals. Simulated and observed dBT for a particular value of PW is not constant; several physical factors impact dBT, including the variability in

499

ARM - Publications: Science Team Meeting Documents: Tropical Warm Pool  

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

Tropical Warm Pool International Cloud Experiment Tropical Warm Pool International Cloud Experiment May, Peter Bureau or Meteorology Research Centre Mather, James Pacific Northwest National Laboratory Jakob, Christian BMRC One of the most complete data sets describing tropical convection ever collected will result from the upcoming Tropical Warm Pool International Cloud Experiment (TWPICE) in the area around Darwin in late 2005 and early 2006. The aims of the experiment will be to examine convective cloud systems from their initial stages through to the decay of the cirrus generated and to measure their impact on the environment. The experiment design includes an unprecedented network of ground-based observations (soundings, active and passive remote sensors) combined with a large range of low, mid and high altitude aircraft for in-situ and remote sensing

500

ARM - Publications: Science Team Meeting Documents: Evaluation of GFDL SCM  

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

Evaluation of GFDL SCM Cloud Fractions and Surface Radiation Fields with Evaluation of GFDL SCM Cloud Fractions and Surface Radiation Fields with Those from the Ground-based Remote Sensing at SGP Kim, Byung-Gon Princeton University Klein, Stephen Lawrence Livermore National Laboratory Mace, Gerald University of Utah Benson, Sally University of Utah The various kinds of approaches to obtain cloud fraction in the model still have the limitations, which accordingly result in the consequent errors in the model radiative fluxes. Because of the different schemes to estimate the cloud fraction by the model and also observation artifacts, the prudent comparisons should be made in order to reach the right answer. This study demonstrates the more revised approaches of comparisons to improve the evaluation of cloud fraction. To do this, a relatively inexpensive and