HR: 1340h
AN: A33D-0090    [Abstracts]
TI: Aerosol Optical Properties in Southeast Asia and Comparison of MODIS Optical Depth Retrievals to AERONET Measurements
AU: * Eck, T F
EM: teck@ltpmail.gsfc.nasa.gov
AF: NASA/GSFC, Goddard Space Flight Center, Greenbelt, MD 20771 United States
AU: Holben, B N
EM: bholben@pop900.gsfc.nasa.gov
AF: NASA/GSFC, Goddard Space Flight Center, Greenbelt, MD 20771 United States
AU: Boonjawat, J
EM: jariya@start.or.th
AF: Southeast Asia START Regional Center, Chulalongkorn University Hert Dunant Road, Pathumwan , Bangkok, 10330 Thailand
AU: Le, H V
EM: vnbacgiang@yahoo.co.uk
AF: Vietnam National Centre for Natural Science and Technology, Atmospheric Physics Department Institute of Geophysics 18 Hoang Quoc Viet Cau Giay , Hanoi, 557282 Viet Nam
AU: Remer, L A
EM: Lorraine.A.Remer@nasa.gov
AF: NASA/GSFC, Goddard Space Flight Center, Greenbelt, MD 20771 United States
AU: Schafer, J S
EM: joschafe@pop900.gsfc.nasa.gov
AF: NASA/GSFC, Goddard Space Flight Center, Greenbelt, MD 20771 United States
AU: Reid, J S
EM: reidj@nrlmry.navy.mil
AF: Naval Research Laboratory, Aerosol and Radiation Modeling Section Marine Meteorology Division 7 Grace Hopper Ave., Stop 2 , Monterey, CA 93943-5502 United States
AU: Dubovik, O
EM: dubovik@aeronet.gsfc.nasa.gov
AF: NASA/GSFC, Goddard Space Flight Center, Greenbelt, MD 20771 United States
AU: Smirnov, A
EM: asmirnov@aeronet.gsfc.nasa.gov
AF: NASA/GSFC, Goddard Space Flight Center, Greenbelt, MD 20771 United States
AB: Monitoring of aerosol optical properties at Aerosol Robotic Network (AERONET) sites in 2003 and 2004 at five locations in Thailand and two in Vietnam has contributed to the initial stages of an optical aerosol climatology in the region. During the dry season monsoon of November through April (6 months) the aerosols are primarily anthropogenic in origin, generated by agricultural biomass burning and fossil fuel combustion/ industrial emissions. Monitoring during the entire dry season at one rural site in Thailand suggests a seasonal trend in optical properties, showing decreases in both accumulation mode particle size and also in single scattering albedo as the biomass burning activity peaks late in the season. Validation comparisons of aerosol optical depth (AOD) from MODIS retrievals (on both Terra and Aqua satellites) to AERONET data are presented for four sites. Influences of both aerosol properties assumed in the satellite retrievals and of satellite surface reflectance estimates are observed in these validation comparisons. Additionally, smoke optical properties in Thailand are compared to those at AERONET sites in other major biomass burning regions in tropical southern Africa, South America, and in boreal forest regions and found to be intermediate in absorption between smoke from forest region sites (weak absorption for smoke) to savanna sites in Africa (strong absorption). Aerosol single scattering albedo and size distributions measured in the urban center of Bangkok, Thailand are compared with those measured at other urban sites globally, and found to be strongly absorbing (SSA = 0.90 at 550 nm) in the dry season.
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0345 Pollution--urban and regional (0305)
DE: 0360 Transmission and scattering of radiation
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting