SCIENTIFIC PROGRAM

SCIENTIFIC PROGRAM

Chapman Conferences

Atmospheric Absorption of Solar Radiation

August 13-17, 2001

Rocky Mountain Park Holiday Inn

Estes Park, Colorado, USA

All sessions will take place at the Rocky Mountain Park Holiday Inn in the Ballroom, Salons ABC. Registration, refreshment breaks, and receptions will be held in the Front Foyer.

Monday, August 13, 2001

SESSION 1:

THE ATMOSPHERIC ABSORPTION PROBLEM AND ITS IMPACT ON CLIMATE MODELS
Chair: V Ramanathan, Scripps Institution of Oceanography

0830 A Arking Invited - The Atmospheric Absorption Problem: A Record of Contradictions

0910 S Solomon Invited - The Atmospheric Absorption Problem: One Spectroscopist's View

0950 REFRESHMENT BREAK

1020 A Slingo Invited - A Climate Modeling Perspective

1050 J T Kiehl Invited - Implications of Uncertainties in Atmospheric Absorption for Coupled Climate Modeling

SESSION 2A:

COMPARISON BETWEEN MODELS AND OBSERVATIONS: RADIATION BUDGETS
Chair: D Anderson, NASA Headquarters

1120 M Wild Discrepancies between GCM-calculated Solar Fluxes and Surface-based Observations

1138 S Kato, T P Charlock, N G Loeb, F G Rose, D A Rutan Estimating Shortwave Absorption by the Atmosphere under Clear and Cloudy Conditions Using CERES and ARM Data

1156 LUNCH (on your own)

1330 F P J Valero, B C Bush, D C Marsden, Q T Nguyen, S K Pope Invited - The Absorption of Solar Radiation by the Atmosphere, Observations and Models

1400 A N Rublev, N E Chubarova Measurements and Calculations of Solar Fluxes Under Different Atmospheric Conditions

1418 M D Chou, P K Chan, M H Yan Effect of Clouds on the Atmospheric Solar Heating in the Tropical Western Pacific

1436 D W Fillmore, W D Collins Evidence for enhanced shortwave absorption over the tropical pacific from collocated satellite and buoy observations

1454 W C Conant Invited - Discerning the Roles of Water Vapor and Aerosol in the Clear_Sky Radiation Budget

1524 REFRESHMENT BREAK

SESSION 2B:

COMPARISON BETWEEN MODELS AND OBSERVATIONS: CLOUD EFFECTS
Chair: M Wild, Swiss Federal Institute of Technology

1600 R D Cess Invited - Sampling issues associated with the measurement of atmospheric shortwave absorption by aircraft

1630 S Asano Invited - Airborne Experiments of Solar Absorption by Stratiform Clouds in the Japanese Cloud_Climate Study (JACCS) Program

1700 Y Hu Deep Convective Cloud Albedo and Absorption Studies from TRMM and Terra

1718 BREAK

1800 RECEPTION

2000 END OF DAY

Tuesday, August 14, 2001

SESSION 2B, continued:

Chair: V Ramaswamy, NOAA Geophysical Fluid Dynamics Lab

0830 P Pilewskie, M Rabbette, J Pommier, R Bergstrom, S Howard Invited - A Moderate Resolution View of the Absorption of Solar Radiation by Clouds

0900 R Pirazzini Cloud Forcing on the Surface Radiation Budget at two Antarctic Stations

0918 Z Li Collective Evidence Disputing the Cloud Absorption Anomaly and Possible Causes Leading to an Apparent CAA

SESSION 2C:

COMPARISON BETWEEN MODELS AND OBSERVATIONS: AEROSOL EFFECTS
Chair: P B Russell, NASA Ames Research Center

0936 S E Schwartz, R N Halthore Discrepancy in Aerosol Forcing of Diffuse Downwelling Shortwave Irradiance

0954 REFRESHMENT BREAK

1030 B Liepert, I Tegen Multi_Decadal Solar Radiation Observations in the United States and Direct Tropospheric Aerosol Forcing

1048 J V Martins, P Artaxo, Y Kaufman Effects of Aerosol Absorption in the Direct Radiative Forcing of Natural and Anthropogenic Aerosols

1106 W D Collins, D W Fillmore, J T Kiehl Improved estimates of global atmospheric shortwave absorption by aerosols in clear and cloudy atmospheres

1124 S Yu, C S Zender, V K Saxena Atmospheric Absorption of Solar Radiation by Boundary Layer Aerosol in the Southeastern US: Model Estimates on the Basis of New Observations

1142 A J Machado Diffuse solar radiation modeling applied to the city of Sao Paulo (Brazil)

1200 LUNCH (on your own)

SESSION 2D:

COMPARISON BETWEEN MODELS AND OBSERVATIONS: ARESE II RESULTS
Chair: S Asano, Tohoku University

1330 R G Ellingson, The ARESE II Science Team Invited - The Second ARM Enhanced Shortwave Experiment (ARESE II) - Experiment Description and Initial Results

1400 T P Ackerman, D M Powell, R T Marchand Quantifying the Magnitude of the Anomalous Absorption Effect

1418 A D Rapp, D R Doelling, P Minnis, W L Smith, Jr. Comparison of TOA Shortwave Albedo and Atmospheric Solar Absorption Derived from GOES_8, CERES, Aircraft, and Surface Measurements During ARESE II with Model Calculations

1436 S K Pope, F P J Valero ARESE II Measurements of Broadband Absorptance

1454 EXTENDED BREAK

SESSION 3A:

RADIATIVE TRANSFER AND ATMOSPHERE/SURFACE OPTICAL PROPERTIES: RADIATIVE TRANSFER THEORY
Chair: J T Kiehl, National Center for Atmospheric Research

1900 K N Liou, Y Takano, Q Fu, T Ackerman, T Charlock Invited - On the Absorption of Solar Radiation in Clear and Cloudy Atmospheres

1930 V Ramaswamy Invited - Factors Governing the Absorption of Solar Radiation in the Atmosphere

2000 S A Clough, E J Mlawer Invited - Status of the Spectroscopy for the Solar Regime: Modeling and Validations with Surface Based Spectral Irradiance Measurements for Clear and Cloudy Atmospheres

2030 H M Nussenzveig, W J Wiscombe Effect of Mie resonances on Cloud Absorption

2048 END OF DAY

Wednesday, August 15, 2001

SESSION 3B:

RADIATIVE TRANSFER AND ATMOSPHERE/SURFACE OPTICAL PROPERTIES: GASEOUS ABSORPTION
Chair: S Solomon, NOAA Aeronomy Laboratory

0830 K M Smith, D A Newnham High_Resolution Short_Wave Atmospheric Absorption by Water Vapour and Oxygen: Evaluation of Molecular Databases

0848 P Varanasi, Q Zou, C Sun, B Ranganayakamma, S Mathur, T Refaat, C R Prasad The Absorption Spectrum of Normal, Saturated and Super_saturated Water Vapor

0906 L P Giver, P Pilewskie, W J Gore, R S Freedman, C Chackerian, Jr., P Varanasi Laboratory Measurements of the 940, 1130, and 1370 nm Water Vapor Absorption Band Profiles

0924 B Sierk, S Solomon, J S Daniel, R W Portmann, S I Gutman Sunrise Spectroscopic Measurements for Tests of Water Vapor Continuum Models

0942 A N Maurellis, R Lang The Synthesis of Water Vapour Modeling in the Visible with Satellite Measurements

1000 REFRESHMENT BREAK

SESSION 3B, continued:

Chair: S A Clough, Atmospheric & Environmental Research, Inc.

1030 V Vaida, J S Daniel, H G Kjaergaard, L M Goss, A F Tuck Atmospheric Absorption of Near Infrared and Visible Solar Radiation by the Hydrogen Bonded Water Dimer

1048 K P Shine, J C S Chagas, D A Newnham, K M Smith Effects of Improvements in Near_Infrared Water Vapour Line Intensities on Short_Wave Atmospheric Absorption

1106 R Bennartz, U Lohmann Impact of improved near infrared water vapor line data on absorption of solar radiation in GCMs

1124 J C S Chagas, D A Newnham, K M Smith, K P Shine Impacts of New Measurements of Oxygen Collision_Induced Absorption on Estimates of Short_Wave Atmospheric Absorption

1142 EXTENDED BREAK

SESSION 3C:

RADIATIVE TRANSFER AND ATMOSPHERE/SURFACE OPTICAL PROPERTIES: AEROSOLS AND SURFACE
Chair: S E Schwartz, Brookhaven National Laboratory

1600 O Dubovik, B N Holben, Y J Kaufman, T F Eck, A Smirnov, M D King, D Tanre, I Slutsker Absorption of Key Aerosol Types Observed in Worldwide Locations

1618 Y J Kaufman, O Dubovnik, A Smirnov, B N Holben, L A Remer, D Tanre Invited - Remote sensing of aerosol and non_aerosol absorption

1648 M A Box, I Polonsky, Y Qin Application of Radiative Perturbation Theory to the Remote Sensing of Atmospheric Optical Properties

1706 C Cattrall, K L Carder Retrieval of Columnar Aerosol Phase Function and Single_Scattering Albedo From Sky Radiance Over the Ocean: Measurements of African Dust

1724 DINNER (on your own)

SESSION 3C, continued:

Chair: Y J Kaufman, NASA Goddard Space Flight Center

1900 T Elias, A M Silva Experimental Uncertainty of the Column_Integrated Aerosol Single Scattering Albedo Estimated Through Intercomparison of Radiance Measurements

1918 S Kinne, O Dubovik, B Holben, T Eck, A Smirnov, I Slutsker Correlations among Aerosol Properties based on AERONET Statistics

1936 P B Russell, J Redemann, B Schmid, J M Livingston, R W Bergstrom, S A Ramirez Shortwave Radiative Fluxes, Solar_Beam Transmissions, and Aerosol Properties: TARFOX and ACE_2 Find More Absorption From Flux Radiometry Than From Other Measurements

1954 B C Bush, F P J Valero Surface Radiative Forcing During INDOEX and ACE_ASIA

2012 A P Trischenko, Z Li Impact of Directionality and Inhomogeneity of the Surface Albedo on Solar Radiation Budget

2030 END OF DAY

Thursday, August 16, 2001

SESSION 3D:

RADIATIVE TRANSFER AND ATMOSPHERE/SURFACE OPTICAL PROPERTIES: CLOUDS
Chair: K N Liou, University of California, Los Angeles

0830 R C J Somerville, S F Iacobellis, S Klein Comparing Model and Observational Determinations of Clouds and Cloud Radiative Properties

0848 G Baeuml, E Roeckner Statistical Approach for a consistent treatment of cloud variability in GCM solar radiative transfer computation

0906 P K Wang, H C Liu Effect of Ice Microphysics and Microdynamics on Cirrus Absorption of Solar Radiation

0924 W F J Evans, E C Puckrin The absorption of NIR solar radiation by drizzle in clouds

0942 REFRESHMENT BREAK

SESSION 3D, continued:

Chair: W Collins, NCAR

1015 R W Portmann Invited - Cloud Modulation of Oxygen Photon Path Lengths: Measurement vs. Model

1045 K Pfeilsticker, O Funk Photon Pathlengths Distributions for Cloudy Skies: Oxygen A_Band Measurements and Radiative Transfer Model Calculations

1103 Y Knyazikhin, A Marshak, R B Myneni, W J Wiscombe A Correct Treatment of Cloud Large Drops in Radiative Transfer and Anomalous Absorption

1121 Q Fu Anomalous Absorption of Solar Radiation: Clouds, Aerosol, and Water Vapor

1139 LUNCH (on your own)

SESSION 4A:

OBSERVATIONAL AND MODELING STRATEGIES: CALIBRATION AND SPECTRAL CONSIDERATIONS
Chair: P Pilewskie, NASA Ames Research Center

1315 S C Tsay, M D King, R F Cahalan Invited - Absorption of Solar Radiation by Clouds: A Second Look at Irradiance Measurements

1345 A Bucholtz A Sensitivity and Error Analysis Study of the Radiative Flux Divergence Method of Measuring the Absorptance of Solar Radiation

1403 C N Long, Y Younkin, D M Powell Clear_Sky SW Model_Measurement Comparison Differences: The Contribution By Diffuse Shortwave Radiometer IR Loss Errors

1421 T M Hawat, T M Stephen, F J Murcray Radiometric Calibration for Solar_Looking Spectrometers in Ground_Based Measurements

1439 N B Wood, E G Dutton Comparison of Eppley_Kendall Cavity Measurements of Direct Beam Solar Irradiance with Model Results

1457 L Harrison, P Kiedron Invited - The Solar Spectrum 360 to 1050 nm from Rotating Shadowband Spectroradiometer (RSS) Measurements at the Southern Great Plains Site

1527 REFRESHMENT BREAK

SESSION 4B:

OBSERVATIONAL AND MODELING STRATEGIES: INHOMOGENEOUS FIELDS
Chair: R Somerville, Scripps Institution of Oceanography

1600 W O'Hirok, C Gautier Invited - Direct Comparison of Theoretical and Observed Estimates of Solar Radiation Absorption in a Cloudy Atmosphere

1630 A B Davis, A Marshak The Anatomy and Physiology of (True) Solar Absorption in Three_Dimensional Clouds

1648 S V Buldyrev, A B Davis, A Marshak, H E Stanley, K Pfeilsticker, D M Suszcynsky, H W Barker Levy/Anomalous Diffusion as a Mean_Field Theory for 3D Cloud Effects in Shortwave Radiative Transfer: Empirical Support, New Analytical Formulation, and Impact on Atmospheric Absorption

1706 A Marshak, W J Wiscombe, A B Davis, L Oreopoulis Conditional Sampling for Two- and One-Aircraft Measurements of Cloud Absorption

1724 BREAK

1800 RECEPTION

2000 END OF DAY

Friday, August 17, 2001

SESSION 4C:

OBSERVATIONAL AND MODELING STRATEGIES: NEW TECHNIQUES/INSTRUMENTS
Chair: T Ackerman, Pacific Northwest National Laboratory

0830 S P Love, A B Davis Active Probing of Cloud Multiple Scattering, Physical Thickness, and Optical Density using Wide_Angle Imaging Lidar

0848 M Wendisch, D Muller, D Schell, J Heintzenberg, S Schmidt Radiation Measurements with a new Spectral Airborne Albedometer

0906 J F Garten, W R Skinner Use of a High_Resolution, Space_Based Spectrometer to Study Radiative Properties of Clouds

0924 A W Strawa, R Castaneda, T G Owano, D Bear In situ measurement of aerosol extinction

0942 REFRESHMENT BREAK

SESSION 5:

RESOLVING THE DISCREPANCY: WHERE TO LOOK AND WHAT TO DO
Chair: A Slingo, Met Office Hadley Centre

1015 V Ramanathan A Search for Excess Solar Absorption in the Tropics

1055-1300 Discussion and non_scheduled short presentations.

1300 MEETING ADJOURNS

Return to General Information for this Meeting

Monday, August 13, 2001
SESSION 1:
THE ATMOSPHERIC ABSORPTION PROBLEM AND ITS IMPACT ON CLIMATE MODELS Chair: V Ramanathan, Scripps Institution of Oceanography
0830	A Arking	Invited - The Atmospheric Absorption Problem: A Record of Contradictions
0910	S Solomon	Invited - The Atmospheric Absorption Problem: One Spectroscopist's View
0950		REFRESHMENT BREAK
1020	A Slingo	Invited - A Climate Modeling Perspective
1050	J T Kiehl	Invited - Implications of Uncertainties in Atmospheric Absorption for Coupled Climate Modeling

SESSION 2A:
COMPARISON BETWEEN MODELS AND OBSERVATIONS: RADIATION BUDGETS Chair: D Anderson, NASA Headquarters
1120	M Wild	Discrepancies between GCM-calculated Solar Fluxes and Surface-based Observations
1138	S Kato, T P Charlock, N G Loeb, F G Rose, D A Rutan	Estimating Shortwave Absorption by the Atmosphere under Clear and Cloudy Conditions Using CERES and ARM Data
1156		LUNCH (on your own)
1330	F P J Valero, B C Bush, D C Marsden, Q T Nguyen, S K Pope	Invited - The Absorption of Solar Radiation by the Atmosphere, Observations and Models
1400	A N Rublev, N E Chubarova	Measurements and Calculations of Solar Fluxes Under Different Atmospheric Conditions
1418	M D Chou, P K Chan, M H Yan	Effect of Clouds on the Atmospheric Solar Heating in the Tropical Western Pacific
1436	D W Fillmore, W D Collins	Evidence for enhanced shortwave absorption over the tropical pacific from collocated satellite and buoy observations
1454	W C Conant	Invited - Discerning the Roles of Water Vapor and Aerosol in the Clear_Sky Radiation Budget
1524		REFRESHMENT BREAK

SESSION 2B:
COMPARISON BETWEEN MODELS AND OBSERVATIONS: CLOUD EFFECTS Chair: M Wild, Swiss Federal Institute of Technology
1600	R D Cess	Invited - Sampling issues associated with the measurement of atmospheric shortwave absorption by aircraft
1630	S Asano	Invited - Airborne Experiments of Solar Absorption by Stratiform Clouds in the Japanese Cloud_Climate Study (JACCS) Program
1700	Y Hu	Deep Convective Cloud Albedo and Absorption Studies from TRMM and Terra
1718		BREAK
1800		RECEPTION
2000		END OF DAY

Tuesday, August 14, 2001
SESSION 2B, continued:
Chair: V Ramaswamy, NOAA Geophysical Fluid Dynamics Lab
0830	P Pilewskie, M Rabbette, J Pommier, R Bergstrom, S Howard	Invited - A Moderate Resolution View of the Absorption of Solar Radiation by Clouds
0900	R Pirazzini	Cloud Forcing on the Surface Radiation Budget at two Antarctic Stations
0918	Z Li	Collective Evidence Disputing the Cloud Absorption Anomaly and Possible Causes Leading to an Apparent CAA

SESSION 2C:
COMPARISON BETWEEN MODELS AND OBSERVATIONS: AEROSOL EFFECTS Chair: P B Russell, NASA Ames Research Center
0936	S E Schwartz, R N Halthore	Discrepancy in Aerosol Forcing of Diffuse Downwelling Shortwave Irradiance
0954		REFRESHMENT BREAK
1030	B Liepert, I Tegen	Multi_Decadal Solar Radiation Observations in the United States and Direct Tropospheric Aerosol Forcing
1048	J V Martins, P Artaxo, Y Kaufman	Effects of Aerosol Absorption in the Direct Radiative Forcing of Natural and Anthropogenic Aerosols
1106	W D Collins, D W Fillmore, J T Kiehl	Improved estimates of global atmospheric shortwave absorption by aerosols in clear and cloudy atmospheres
1124	S Yu, C S Zender, V K Saxena	Atmospheric Absorption of Solar Radiation by Boundary Layer Aerosol in the Southeastern US: Model Estimates on the Basis of New Observations
1142	A J Machado	Diffuse solar radiation modeling applied to the city of Sao Paulo (Brazil)
1200		LUNCH (on your own)

SESSION 2D:
COMPARISON BETWEEN MODELS AND OBSERVATIONS: ARESE II RESULTS Chair: S Asano, Tohoku University
1330	R G Ellingson, The ARESE II Science Team	Invited - The Second ARM Enhanced Shortwave Experiment (ARESE II) - Experiment Description and Initial Results
1400	T P Ackerman, D M Powell, R T Marchand	Quantifying the Magnitude of the Anomalous Absorption Effect
1418	A D Rapp, D R Doelling, P Minnis, W L Smith, Jr.	Comparison of TOA Shortwave Albedo and Atmospheric Solar Absorption Derived from GOES_8, CERES, Aircraft, and Surface Measurements During ARESE II with Model Calculations
1436	S K Pope, F P J Valero	ARESE II Measurements of Broadband Absorptance
1454		EXTENDED BREAK

SESSION 3A:
RADIATIVE TRANSFER AND ATMOSPHERE/SURFACE OPTICAL PROPERTIES: RADIATIVE TRANSFER THEORY Chair: J T Kiehl, National Center for Atmospheric Research
1900	K N Liou, Y Takano, Q Fu, T Ackerman, T Charlock	Invited - On the Absorption of Solar Radiation in Clear and Cloudy Atmospheres
1930	V Ramaswamy	Invited - Factors Governing the Absorption of Solar Radiation in the Atmosphere
2000	S A Clough, E J Mlawer	Invited - Status of the Spectroscopy for the Solar Regime: Modeling and Validations with Surface Based Spectral Irradiance Measurements for Clear and Cloudy Atmospheres
2030	H M Nussenzveig, W J Wiscombe	Effect of Mie resonances on Cloud Absorption
2048		END OF DAY

Wednesday, August 15, 2001
SESSION 3B:
RADIATIVE TRANSFER AND ATMOSPHERE/SURFACE OPTICAL PROPERTIES: GASEOUS ABSORPTION Chair: S Solomon, NOAA Aeronomy Laboratory
0830	K M Smith, D A Newnham	High_Resolution Short_Wave Atmospheric Absorption by Water Vapour and Oxygen: Evaluation of Molecular Databases
0848	P Varanasi, Q Zou, C Sun, B Ranganayakamma, S Mathur, T Refaat, C R Prasad	The Absorption Spectrum of Normal, Saturated and Super_saturated Water Vapor
0906	L P Giver, P Pilewskie, W J Gore, R S Freedman, C Chackerian, Jr., P Varanasi	Laboratory Measurements of the 940, 1130, and 1370 nm Water Vapor Absorption Band Profiles
0924	B Sierk, S Solomon, J S Daniel, R W Portmann, S I Gutman	Sunrise Spectroscopic Measurements for Tests of Water Vapor Continuum Models
0942	A N Maurellis, R Lang	The Synthesis of Water Vapour Modeling in the Visible with Satellite Measurements
1000		REFRESHMENT BREAK

SESSION 3B, continued:
Chair: S A Clough, Atmospheric & Environmental Research, Inc.
1030	V Vaida, J S Daniel, H G Kjaergaard, L M Goss, A F Tuck	Atmospheric Absorption of Near Infrared and Visible Solar Radiation by the Hydrogen Bonded Water Dimer
1048	K P Shine, J C S Chagas, D A Newnham, K M Smith	Effects of Improvements in Near_Infrared Water Vapour Line Intensities on Short_Wave Atmospheric Absorption
1106	R Bennartz, U Lohmann	Impact of improved near infrared water vapor line data on absorption of solar radiation in GCMs
1124	J C S Chagas, D A Newnham, K M Smith, K P Shine	Impacts of New Measurements of Oxygen Collision_Induced Absorption on Estimates of Short_Wave Atmospheric Absorption
1142		EXTENDED BREAK

SESSION 3C:
RADIATIVE TRANSFER AND ATMOSPHERE/SURFACE OPTICAL PROPERTIES: AEROSOLS AND SURFACE Chair: S E Schwartz, Brookhaven National Laboratory
1600	O Dubovik, B N Holben, Y J Kaufman, T F Eck, A Smirnov, M D King, D Tanre, I Slutsker	Absorption of Key Aerosol Types Observed in Worldwide Locations
1618	Y J Kaufman, O Dubovnik, A Smirnov, B N Holben, L A Remer, D Tanre	Invited - Remote sensing of aerosol and non_aerosol absorption
1648	M A Box, I Polonsky, Y Qin	Application of Radiative Perturbation Theory to the Remote Sensing of Atmospheric Optical Properties
1706	C Cattrall, K L Carder	Retrieval of Columnar Aerosol Phase Function and Single_Scattering Albedo From Sky Radiance Over the Ocean: Measurements of African Dust
1724		DINNER (on your own)

SESSION 3C, continued:
Chair: Y J Kaufman, NASA Goddard Space Flight Center
1900	T Elias, A M Silva	Experimental Uncertainty of the Column_Integrated Aerosol Single Scattering Albedo Estimated Through Intercomparison of Radiance Measurements
1918	S Kinne, O Dubovik, B Holben, T Eck, A Smirnov, I Slutsker	Correlations among Aerosol Properties based on AERONET Statistics
1936	P B Russell, J Redemann, B Schmid, J M Livingston, R W Bergstrom, S A Ramirez	Shortwave Radiative Fluxes, Solar_Beam Transmissions, and Aerosol Properties: TARFOX and ACE_2 Find More Absorption From Flux Radiometry Than From Other Measurements
1954	B C Bush, F P J Valero	Surface Radiative Forcing During INDOEX and ACE_ASIA
2012	A P Trischenko, Z Li	Impact of Directionality and Inhomogeneity of the Surface Albedo on Solar Radiation Budget
2030		END OF DAY

Thursday, August 16, 2001
SESSION 3D:
RADIATIVE TRANSFER AND ATMOSPHERE/SURFACE OPTICAL PROPERTIES: CLOUDS Chair: K N Liou, University of California, Los Angeles
0830	R C J Somerville, S F Iacobellis, S Klein	Comparing Model and Observational Determinations of Clouds and Cloud Radiative Properties
0848	G Baeuml, E Roeckner	Statistical Approach for a consistent treatment of cloud variability in GCM solar radiative transfer computation
0906	P K Wang, H C Liu	Effect of Ice Microphysics and Microdynamics on Cirrus Absorption of Solar Radiation
0924	W F J Evans, E C Puckrin	The absorption of NIR solar radiation by drizzle in clouds
0942		REFRESHMENT BREAK

SESSION 3D, continued:
Chair: W Collins, NCAR
1015	R W Portmann	Invited - Cloud Modulation of Oxygen Photon Path Lengths: Measurement vs. Model
1045	K Pfeilsticker, O Funk	Photon Pathlengths Distributions for Cloudy Skies: Oxygen A_Band Measurements and Radiative Transfer Model Calculations
1103	Y Knyazikhin, A Marshak, R B Myneni, W J Wiscombe	A Correct Treatment of Cloud Large Drops in Radiative Transfer and Anomalous Absorption
1121	Q Fu	Anomalous Absorption of Solar Radiation: Clouds, Aerosol, and Water Vapor
1139		LUNCH (on your own)

SESSION 4A:
OBSERVATIONAL AND MODELING STRATEGIES: CALIBRATION AND SPECTRAL CONSIDERATIONS Chair: P Pilewskie, NASA Ames Research Center
1315	S C Tsay, M D King, R F Cahalan	Invited - Absorption of Solar Radiation by Clouds: A Second Look at Irradiance Measurements
1345	A Bucholtz	A Sensitivity and Error Analysis Study of the Radiative Flux Divergence Method of Measuring the Absorptance of Solar Radiation
1403	C N Long, Y Younkin, D M Powell	Clear_Sky SW Model_Measurement Comparison Differences: The Contribution By Diffuse Shortwave Radiometer IR Loss Errors
1421	T M Hawat, T M Stephen, F J Murcray	Radiometric Calibration for Solar_Looking Spectrometers in Ground_Based Measurements
1439	N B Wood, E G Dutton	Comparison of Eppley_Kendall Cavity Measurements of Direct Beam Solar Irradiance with Model Results
1457	L Harrison, P Kiedron	Invited - The Solar Spectrum 360 to 1050 nm from Rotating Shadowband Spectroradiometer (RSS) Measurements at the Southern Great Plains Site
1527		REFRESHMENT BREAK

SESSION 4B:
OBSERVATIONAL AND MODELING STRATEGIES: INHOMOGENEOUS FIELDS Chair: R Somerville, Scripps Institution of Oceanography
1600	W O'Hirok, C Gautier	Invited - Direct Comparison of Theoretical and Observed Estimates of Solar Radiation Absorption in a Cloudy Atmosphere
1630	A B Davis, A Marshak	The Anatomy and Physiology of (True) Solar Absorption in Three_Dimensional Clouds
1648	S V Buldyrev, A B Davis, A Marshak, H E Stanley, K Pfeilsticker, D M Suszcynsky, H W Barker	Levy/Anomalous Diffusion as a Mean_Field Theory for 3D Cloud Effects in Shortwave Radiative Transfer: Empirical Support, New Analytical Formulation, and Impact on Atmospheric Absorption
1706	A Marshak, W J Wiscombe, A B Davis, L Oreopoulis	Conditional Sampling for Two- and One-Aircraft Measurements of Cloud Absorption
1724		BREAK
1800		RECEPTION
2000		END OF DAY

Friday, August 17, 2001
SESSION 4C:
OBSERVATIONAL AND MODELING STRATEGIES: NEW TECHNIQUES/INSTRUMENTS Chair: T Ackerman, Pacific Northwest National Laboratory
0830	S P Love, A B Davis	Active Probing of Cloud Multiple Scattering, Physical Thickness, and Optical Density using Wide_Angle Imaging Lidar
0848	M Wendisch, D Muller, D Schell, J Heintzenberg, S Schmidt	Radiation Measurements with a new Spectral Airborne Albedometer
0906	J F Garten, W R Skinner	Use of a High_Resolution, Space_Based Spectrometer to Study Radiative Properties of Clouds
0924	A W Strawa, R Castaneda, T G Owano, D Bear	In situ measurement of aerosol extinction
0942		REFRESHMENT BREAK

SESSION 5:
RESOLVING THE DISCREPANCY: WHERE TO LOOK AND WHAT TO DO Chair: A Slingo, Met Office Hadley Centre
1015	V Ramanathan	A Search for Excess Solar Absorption in the Tropics
1055-1300		Discussion and non_scheduled short presentations.
1300		MEETING ADJOURNS