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Airborne Sunphotometry and Closure Studies in the SAFARI-2000 Dry Season Campaign B. Schmid 1, P.B. Russell 2, P.Pilewskie 2, J. Redemann 1, P.V. Hobbs.

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Presentation on theme: "Airborne Sunphotometry and Closure Studies in the SAFARI-2000 Dry Season Campaign B. Schmid 1, P.B. Russell 2, P.Pilewskie 2, J. Redemann 1, P.V. Hobbs."— Presentation transcript:

1 Airborne Sunphotometry and Closure Studies in the SAFARI-2000 Dry Season Campaign B. Schmid 1, P.B. Russell 2, P.Pilewskie 2, J. Redemann 1, P.V. Hobbs 3, E.J. Welton 4, J. Campbell 5, B.N. Holben 6, D.L. Hlavka 5, M. McGill 6, A. Chu 6, L.A. Remer 6, O. Torres 7, S. Ramirez 8 1 BAER/ NASA Ames, Moffett Field, CA, 2 NASA Ames, Moffett Field, CA, 3 University of Washington, Seattle, WA, 4 GEST/ NASA Goddard, Greenbelt, MD, 5 SSAI/ NASA Goddard, Greenbelt, MD, 6 NASA Goddard, Greenbelt, MD, 7 JCET-UMBC/ NASA Goddard, Greenbelt, MD, 8 Symtech Corp./ NASA Ames, Moffett Field, CA UNIVERSITY OF WASHINGTON CV-580 31 Flights (120 hours) during SAFARI-2000 NASA Ames Airborne Tracking 14-Channel Sunphotometer (AATS-14) Aerosol Optical Depth/Extinction (354-1558 nm, 12 wavelengths) Water Vapor Column/Density 24 data flights on CV-580 NASA Ames Spectral Solar Flux Radiometer (SSFR) Up and downwelling flux 300-1700 nm, Resolution 8-12 nm, 1Hz On CV-580, ER-2 and Skukuza ground-site Aerosol extinction profiles 532 and 1064 nm Ozone Column, Absorbing Aerosol Index, Aerosol Optical Depth (380 nm), Single Scatter Albedo (380 nm) MODIS Moderate-resolution Imaging Spectroradiometer over water (AOD at 6 wavelengths +1 extrapolated, size characteristics) over land (AOD at 2 wavelengths + 1 interpolated) AOD over water and land (0.557 mm), aerosol type Aerosol retrieval from satellites in SAFARI-2000 Cimel Sun/sky radiometers ~20 Southern African sites during SAFARI-2000 Aerosol Optical Depth at 7 wavelengths Size Distributions Single Scatter Albedo Micro Pulse Lidar 2 sites during SAFARI-2000 Aerosol Extinction Profiles 523 nm Aerosol optical depth and derived extinction vertical profiles Columnar water vapor and derived water vapor density profiles Comparison of TOMS retrieved AOD with airborne sunphotometer (AATS-14) during low level run SSA=0.956 September 2 Address: BAER/ NASA Ames, MS 245-5, Moffett Field, CA 94035-1000 E-mail: bschmid@mail.arc.nasa.gov Website: http://geo.arc.nasa.gov/sgg/SAFARI/ <24Closure analysis0CV-580 in-situ aerosol dataAATS-14 ?Aerosol Absorption, Radiative Forcing 2CV-580 SSFRAATS-14 1Reasonable agreement1TOMSAATS-14 12Good agreement over water 3MODISAATS-14 0 2 0 0 1 3 # cases done Good agreement CommentTotal # of cases Instruments 5MPL-NetAATS-14 12MISRAATS-14 7ER-2 CPLAATS-14 7ER-2 AirMISRAATS-14 7ER-2 MASAATS-14 ~20AeronetAATS-14 Comparisons done to date Profile showing variation in AOD during level legs due to spatial inhomogeneity Restricted profile using only measurements within 3.2 km of lidar site Columnar water vapor and derived water vapor density profiles AOD time series measured by ground based Cimel sunphotometer during vertical profile 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 5:306:006:307:007:308:008:309:009:3010:0010:3011:0011:3012:0012:3013:00 UT 340 nm 380 nm 440 nm 500 nm 670 nm 870 nm 1020 nm start descentend descent AOD Comparison of AOD spectra from ground-based (Cimel) and airborne sunphotometer (AATS-14) during low level run August 22 Comparison of AOD from airborne sunphotometer (AATS-14), airborne lidar (CPL) and ground-based lidar (MPL) Comparison of aerosol extinction from airborne sunphotometer (AATS- 14), airborne lidar (CPL) and ground-based lidar (MPL) Comparison of AOD spectra from ground-based sunphotometer (Cimel), airborne sunphotometer (AATS-14) and MODIS on the Terra satellite during low level run Aerosol optical depth and derived extinction vertical profiles Columnar water vapor and derived water vapor density profiles August 24 Fractional absorption from flux divergence (Leg 6 - Leg 1)/ Leg 6 Net flux (downwelling - upwelling) at 6 altitudes from SSFR Comparison of AOD spectra from ground-based (Cimel) and airborne sunphotometer (AATS-14) during low level run Columnar water vapor and derived water vapor density profiles Aerosol optical depth and derived extinction vertical profiles September 6 Comparison of aerosol extinction from airborne sunphotometer (AATS- 14) and airborne lidar (CPL) Comparison of AOD from airborne sunphotometer (AATS-14) and airborne lidar (CPL) Net flux (downwelling - upwelling) at two altitudes from SSFR Fractional absorption from flux divergence (Leg 2 - Leg 1)/ Leg 2


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