HR: 0800h
AN: A51B-07    [Abstracts]
TI: Comparison of Asian aerosol's radiative effect in Seoul and Gosan, Korea
AU: * Yoon, S
EM: yoon@snu.ac.kr
AF: School of Earth and Environmental Sciences, Seoul National University School of Earth and Environmental Sciences, Seoul National University, San 56-1 Shillim 9-dong, Kwanak-gu Seoul, Korea, Seoul, 151-747, Korea, Republic of
AU: Lee, S
EM: ryra78@hanmail.net
AF: School of Earth and Environmental Sciences, Seoul National University School of Earth and Environmental Sciences, Seoul National University, San 56-1 Shillim 9-dong, Kwanak-gu Seoul, Korea, Seoul, 151-747, Korea, Republic of
AU: Choi, I
EM: env777@air.snu.ac.kr
AF: School of Earth and Environmental Sciences, Seoul National University School of Earth and Environmental Sciences, Seoul National University, San 56-1 Shillim 9-dong, Kwanak-gu Seoul, Korea, Seoul, 151-747, Korea, Republic of
AB: Seasonal variations of aerosol optical properties as well as their direct radiative effects were investigated using the ground-based aerosol measurements and an optical model calculation in Seoul, a mega city, and Gosan, a background rural island, Korea. From the yearly AERONET dataset, our analysis of seasonal and monthly cycle of aerosol optical depth (AOD) shows that AODs in Seoul are higher than those in Gosan because of the higher concentrations of water soluble ions in Seoul. Especially, seasonal AOD differences of both sites becomes maximum in Summer due to the synoptic meteorological patterns and hygroscopic growth of anthropogenic aerosols. OPAC (Optical Properties of Aerosol and Clouds) model and Fu-Liou RTM (Radiative Transfer Model) were employed for the evaluation of aerosol direct radiative forcing (ADRF) at surface and top of the atmosphere (TOA). A method of determining the values of aerosol optical properties as input parameters was utilized for the ADRF calculation from the AERONET dataset. In each season, the mean ADRF in Seoul turned out to be larger than that of Gosan. The ADRF in Gosan from RTM calculation was compared with the ground-based radiation measurements during the ACE-Asia IOP in 2001 and the ABC-EAREX2005 IOP in 2005. In addition, ADRF contributions by chemical compositions were compared in this study between Seoul and Gosan.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 1610 Atmosphere (0315, 0325)
SC: Atmospheric Sciences [A]
MN: 2007 Joint Assembly