HR: 1340h
AN: A33C-1405    [Abstracts]
TI: Estimation of ground-level PM2.5 and PM10 using MODIS aerosol optical observations over East Asia
AU: * Choi, Y
EM: yschoi@cpl.snu.ac.kr
AF: School of Earth and Environmental Sciences, 501-506 Seoul National University, Seoul, 151-742, Korea, Republic of
AU: Park, R
EM: rjpark@snu.ac.kr
AF: School of Earth and Environmental Sciences, 501-506 Seoul National University, Seoul, 151-742, Korea, Republic of
AU: Jeong, J
EM: ss99@snu.ac.kr
AF: School of Earth and Environmental Sciences, 501-506 Seoul National University, Seoul, 151-742, Korea, Republic of
AB: Aerosols from both anthropogenic and natural sources play a significant role in the atmosphere because their variation influences radiation, atmospheric stability, cloud, and precipitation on a time scale of from few days to decades. Recent studies manifest their impact on the atmosphere in East Asia due to rapid growth in economy, however our understanding of aerosols including spatial and temporal variations, sources, and chemical compositions over East Asia remain unclear. Here we employ a method to estimate ground-level PM2.5 and PM10 over East Asia by applying local scaling factors from a global chemical transport model (GEOS-Chem) to a combination of aerosol optical thickness and fine mode fraction measured by the Moderate Resolution Imaging Spectroradiometer (MODIS) instrument for 2001. Aerosol concentrations for individual chemical species in the GEOS-Chem are validated with observations from the Transport and Chemical Evolution over the Pacific (TRACE- P) and the Asian Pacific Regional Aerosol Characterization Experiment (ACE-Asia) aircraft campaigns in spring 2001. Our analysis shows the reliable extent in the spatial and temporal patterns of the estimated PM2.5 and PM10 concentrations. Contributions of individual aerosol species to the estimated PM2.5 and PM10 mass concentrations on the basis of the GEOS-Chem simulation are consistent with a few chemical observations of PM2.5 in surface air over East Asia. Our estimates could be employed for future studies to investigate the role of aerosols in atmospheric processes such as the upper-layer cloud and raindrop formation, the atmospheric stability and circulation, and the regional climate in East Asia.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0322 Constituent sources and sinks
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 3360 Remote sensing
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting