HR: 1340h
AN: A23C-0821    [Abstracts]
TI: Cloud-Aerosol Interaction and its Impact on the Onset of the East Asian Summer Monsoon
AU: * Kim, K
EM: kmkim@climate.gsfc.nasa.gov
AF: Science Systems and Applications, Inc. , 10210 Greenbelt Road, Suite 600, Lanham, MD 20706 United States
AU: Lau, W
EM: lau@climate.gsfc.nasa.gov
AF: NASA/Goddard Space Flight Center, Code 910, Greenbelt, MD 20770 United States
AU: Hsu, C
EM: hsu@wrabbit.gsfc.nasa.gov
AF: Goddard Earth Sciences and Technology Center, 1000 Hiltop Circle, Baltimore, MD 21250 United States
AU: Tsay, S
EM: tsay@climate.gsfc.nasa.gov
AF: NASA/Goddard Space Flight Center, Code 910, Greenbelt, MD 20770 United States
AB: Effect of aerosols from biomass burning on the early development of East Asian monsoon is investigated using various satellites and in situ observations including TOMS Aerosol Index (AI), GPCP precipitation, ISCCP cloud cover, and GISS surface air temperature. Based on TRMM fire produce and mean winds fields at 850mb, we identified the source and interaction regions of aerosols and investigated aerosol-cloud-precipitation characteristics in those regions. During March-April, northern Thailand, Myanmar, and Laos are major source of smoke from the combustion of agricultural waste. Excessive smoke, represented by high AI, is observed especially during dry and cloud-free year. On the other hand, there is no ground source of smoke in the interaction region. The most of aerosols in this area are believed to be transported from the source region. AI is appeared to be correlated with more clouds and less precipitation in interaction region. It suggests that the aerosol-cloud interaction can alter the distribution of cloud and the characteristics of regional hydrology. Aerosol-induced changes in atmospheric stability and associated circulation turns out to be very important to pre-monsoon rainfall pattern in southern China. Prolonged biomass burning is especially effective in changing rainfall pattern during April and May. Results suggest that excessive aerosol transported from source region may intensify pre-monsoon rain band over central China in May and lead to early monsoon onset.
DE: 3354 Precipitation (1854)
DE: 3309 Climatology (1620)
DE: 1620 Climate dynamics (3309)
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting