airborne sunphotometry and closure studies in the safari-2000 dry season campaign
DESCRIPTION
Ozone Column, Absorbing Aerosol Index, Aerosol Optical Depth (380 nm), Single Scatter Albedo (380 nm). Instruments. # cases done. Comment. Total # of cases. 1. 0.9. AATS-14. Aeronet. 3. Good agreement. ~20. 0.8. AATS-14. MPL-Net. 1. Good agreement. 5. 0.7. 340 nm. AATS-14. - PowerPoint PPT PresentationTRANSCRIPT
Airborne Sunphotometry and Closure Studies in the SAFARI-2000 Dry Season Campaign
B. Schmid1, P.B. Russell2, P.Pilewskie2, J. Redemann1, P.V. Hobbs3, E.J. Welton4, J. Campbell5, B.N. Holben6, D.L. Hlavka5, M. McGill6, A. Chu6, L.A. Remer6, O. Torres7, S. Ramirez8
1BAER/ NASA Ames, Moffett Field, CA, 2NASA Ames, Moffett Field, CA, 3University of Washington, Seattle, WA, 4GEST/ NASA Goddard, Greenbelt, MD,5SSAI/ NASA Goddard, Greenbelt, MD, 6NASA Goddard, Greenbelt, MD, 7JCET-UMBC/ NASA Goddard, Greenbelt, MD, 8Symtech Corp./ NASA Ames,
Moffett Field, CA
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
NASA AmesSpectral 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 profiles532 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: [email protected]
Website: http://geo.arc.nasa.gov/sgg/SAFARI/
<24Closure analysis0CV-580 in-situ aerosol data
AATS-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
Good agreement
Good agreement
Comment Total # 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
5:30 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 13:00
UT
340 nm
380 nm
440 nm
500 nm
670 nm
870 nm
1020 nm
start descent end 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)
AOD Profile Comparison at Skukuza on Aug 22, 2000
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4
AOD
AATS-14 AOD (525 nm)
AATS-14 AOD (1020 nm)
CPL AOD (532nm)
CPL AOD (1064 nm)
MPL AOD (524nm)
Comparison of aerosol extinction from airborne sunphotometer (AATS-14), airborne lidar (CPL) and ground-based lidar (MPL)
Extinction Profile Comparison Skukuza Aug 22, 2000
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
0 0.05 0.1 0.15 0.2
Extinction (1/km)
AATS-14 Extinction (525 nm)AATS-14 Extinction (1020 nm)CPL Extinction (532nm)CPL Extinction (1064nm)MPL Extinction (524nm)
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 6Net 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)
Extinction Profile Comparison Mongu, Sep 06, 2000
1
2
3
4
5
6
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
Extinction (1/km)
AATS-14 Extinction (532 nm interp.)
AATS-14 Extinction (1064 nm interp.)
CPL Extinction (532 nm)
CPL Extinction (1064 nm)
9:17-9:30 UT
9:30 UT (30 sec ave.)
Comparison of AOD from airborne sunphotometer (AATS-14) and airborne lidar (CPL)
AOD Profile Comparison, Mongu, Sep 06, 2000
1
2
3
4
5
6
0 0.2 0.4 0.6 0.8 1 1.2
AOD
AATS-14 AOD (532 nm interp.)AATS-14 AOD (1064 nm interp.)CPL AOD (532 nm)CPL AOD (1064 nm)
9:17-9:30 UT
9:30 UT (30 sec ave.)
Net flux (downwelling - upwelling) at two altitudes from SSFR Fractional absorption from flux divergence (Leg 2 - Leg 1)/ Leg 2