Airborne Sunphotometry and Closure Studies during the SAFARI-2000 Dry Season Campaign B. Schmid...
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![Page 1: Airborne Sunphotometry and Closure Studies during the SAFARI-2000 Dry Season Campaign B. Schmid BAER/NASA Ames Research Center, Moffett Field, CA, USA.](https://reader036.fdocuments.in/reader036/viewer/2022062401/5a4d1b897f8b9ab0599bddd2/html5/thumbnails/1.jpg)
Airborne Sunphotometry and Closure StudiesAirborne Sunphotometry and Closure Studies during the during the
SAFARI-2000 Dry Season Campaign SAFARI-2000 Dry Season Campaign
B. Schmid BAER/NASA Ames Research Center, Moffett Field, CA, USAP. B. Russell NASA Ames Research Center P. Pilewskie NASA Ames Research Center J. Redemann BAER/NASA Ames Research Center J. M. Livingston SRI International, Menlo Park, CA, USA P. V. Hobbs University of Washington, Seattle, WA, USAE. J. Welton GEST/NASA Goddard Space Flight Center, Greenbelt, MD, USAJ. Campbell SSAI/NASA Goddard Space Flight Center B. N. Holben NASA Goddard Space Flight Center M. McGill NASA Goddard Space Flight Center
Also Appearing:A. Chu NASA Goddard Space Flight Center L. A. Remer NASA Goddard Space Flight Center O. Torres JCET-UMBC/NASA Goddard Space Flight Center D. L. Hlavka SSAI/NASA Goddard Space Flight Center
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SAFARI 2000 dry-season airborne campaign Aug 13-Sep 25, 2000• 9 Southern African nations• 6 research aircraft• Satellite overpasses• Ground-based measurement teams• Here we discuss:
coordinated observations of the evolution of massive, thick haze layers produced by biomass burning, industrial emissions, marine and biogenic sources.
The Southern African Regional Science Initiative - SAFARI 2000 - is an international science initiative aimed at developing a better understanding of the southern African earth-atmosphere-human system.
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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, some size characteristics)• over land (AOD at 2 wavelengths + 1 interpolated)
Aerosol Optical Depth over water and land (0.557 m), aerosol type
Aerosol retrieval from satellites in SAFARI-2000
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NASA AmesSpectral Solar Flux Radiometer (SSFR)
• Up und downwelling flux• 300-1700 nm, Resolution 8-12 nm, 1Hz• On CV-580, ER-2 and Skukuza ground-site
• Aerosol extinction profiles532 and 1064 nm
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UNIVERSITY OF WASHINGTON CV-58031 Flights (120 hours) during SAFARI-2000
NASA Ames Airborne Tracking14-Channel Sunphotometer (AATS-14)
• Aerosol Optical Depth/Extinction (354-1558 nm, 12 wavelengths)• Water Vapor Column/Density• 24 data flights on CV-580
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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
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•Compare AATS-14 with Cimel during low level run near Mongu
•Vertical profile AATS-14 near Mongu
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•Vertical profile AATS-14 near Maun under TOMS
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Aerosol height=5.185 km
SSA=0.956
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•Comparison AATS-14 with Cimel and MODIS on Terra
•Flux from SSFR
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Spectral Solar Flux Radiometer (SSFR)on CV-580 over Inhaca Island, Aug 24, 2000
Flux Divergence (=Absorption)
Net Flux (down-up)
Layer Depth 2.7 kmLayer AOD at 500 nm=0.24 (from AATS-14)
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•AATS-14 Aerosol and H2O profile
•Comparison with Cimel
•Comparison with MPL
•Comparison with CPL on ER-2
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25 km
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5:30 6:00 6:30 7:00 7:30 8:00 8:30 9:00 9:30 10:00 10:30 11:00 11:30 12:00 12:30 13:00UT
Aer
osol
Opt
ical
Dep
th
340 nm380 nm440 nm500 nm670 nm870 nm
1020 nm
Skukuza 8/22/2000, Aeronet Cimel (Level 1.5 Data)
start descent end descent
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AOD Profile Comparison at Skukuza on Aug 22, 2000
0
0.5
1
1.5
2
2.5
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0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4
AOD
Alti
tude
(km
)AATS-14 AOD (525 nm)AATS-14 AOD (1020 nm)CPL AOD (532nm)CPL AOD (1064 nm)MPL AOD (524nm)
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Extinction Profile Comparison Skukuza Aug 22, 2000
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0.5
1
1.5
2
2.5
3
3.5
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4.5
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0 0.05 0.1 0.15 0.2
Extinction (1/km)
Alti
tude
(km
)AATS-14 Extinction (525 nm)AATS-14 Extinction (1020 nm)CPL Extinction (532nm)CPL Extinction (1064nm)MPL Extinction (524nm)
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Conclusions/Outlook
Instruments # cases done
Comment # cases to do
AATS-14 Aeronet 3 Good agreement ~17
AATS-14 MPL-Net 1 Good agreement 4
AATS-14 CV-580 in-situ aerosol data
0 Closure analysis <24
AATS-14 CV-580 SSFR 2 Aerosol Absorption, Radiative Forcing
?
AATS-14 ER-2 MAS 0 7
AATS-14 ER-2 AirMISR 0 7
AATS-14 ER-2 CPL 1 Good agreement 6
AATS-14 MISR 0 12
AATS-14 MODIS 3 Good agreement over water
9
AATS-14 TOMS 1 Reasonable agreement 0