Monday, 23 January 2012: 5:00 PM
Satellite and Surface-based Remote Sensing of Southeast Asian Aerosols and their Radiative Effects
Room 257 (New Orleans Convention Center )
Using one year (December 2006 - November 2007) of Moderate Resolution Imaging SpectroRadiometer (MODIS), Multiangle Imaging SpectroRadiometer (MISR) and Clouds and the Earth's Radiant Energy System (CERES) data sets from NASA's Terra satellite, we assess the spatial and temporal distributions of aerosol properties (Aerosol Optical Depth, Fine Mode Fraction, and Single Scattering albedo) in the Southeast Asian (SEA). The monsoonal composites (June-Nov and Dec-May) of spatial distributions of all sky shortwave fluxes and clear sky shortwave aerosol radiative effects (SWARE) over SEA are also assessed based on CERES data during the recent five years (2006-2010). We provide a quantitative evaluation of regional cloud-free diurnally averaged SWARE at the top of atmosphere (TOA) over both land and ocean. Our results indicate that the diurnally averaged shortwave radiative effects at the TOA over ocean and land are (-6.4±1.2 Wm-2) and (-5.9±1.3Wm-2), respectively. The 550 nm aerosol optical depths are 0.27±0.24 and 0.12±0.10 over land and ocean. The variations and transports of regional aerosols have been studied based on monsoon meteorology. Fine aerosol particles (< 0.6μm) are dominate over continental area during the whole study period, which represents large fractions of biomass burning aerosols and anthropogenic pollutant aerosols. Our results also indicate that the monthly averaged cloud cover fractions over this region are above 60% and sampling aerosols underneath these cloud layers are further needed in future field campaigns.