HR: 1340h
AN: A53C-1364    [Abstracts]
TI: Characteristics of aerosols in east Asian outflow at Cheju in spring
AU: * sahu, L K
EM: l_kesh@yahoo.com
AF: Research Center for Advanced Science and Technology, University of Tokyo, Tokyo, Japan, Komaba, Tokyo, 153-8904, Japan
AU: Kondo, Y
AF: Research Center for Advanced Science and Technology, University of Tokyo, Tokyo, Japan, Komaba, Tokyo, 153-8904, Japan
AU: Miyazaki, Y
AF: Research Center for Advanced Science and Technology, University of Tokyo, Tokyo, Japan, Komaba, Tokyo, 153-8904, Japan
AU: Koike, M
AF: Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo, Tokyo, Japan., Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
AU: Takegawa, N
AF: Research Center for Advanced Science and Technology, University of Tokyo, Tokyo, Japan, Komaba, Tokyo, 153-8904, Japan
AU: Tanimoto, H
AF: National Institute for Environmental Studies, Ibaraki, Japan., 16-2 Onogawa, Tsukuba, Ibaraki, Tsukuba, 305-8506, Japan
AU: Matsueda, H
AF: Meteorological Research Institute, Ibaraki, Japan, Nagamine, Tsukuba-city, Tsukuba, 305- 0052, Japan
AB: Measurements of aerosols and traces gases were conducted at Gosan site (33o17�fN, 126o10�fE) on Cheju Island, South Korea from 17 March to 6 April 2005. In the spring season, outflows of pollutants from east Asian continents are associated with high pressure system centered over northern region of China and Mongolia. Measurements were continuous for carbonaceous aerosols (BC, OC and WSOC), PM2.5 inorganic aerosols, and trace gases. To investigate dominate source region and transport pathway of air parcels 5-day isentropic back trajectories at 950 hPa were calculated. Based on these trajectories air masses were classified in five contrastingly different categories as (1) Maritime (11%), (2) Free tropospheric (34%), (3) Yellow Sea (16%), (4) Korean (8%), and (5) Chinese (31%). Temporal variations of aerosols and trace gases track each other, in particular for species primarily emitted by anthropogenic activities. All species were observed to show large variability due to alteration in the episodes of air masses from different categories. Mean (�} SD) mass concentrations of BC, OC, WSOC and SO42- were 1.18�}0.83, 4.2�}1.6, 1.26�}1.01 and 4.0�}3.4 ƒÊg m-3, respectively. Concentrations of carbonaceous and PM2.5 aerosols, which are emitted by anthropogenic activities, show lowest in maritime and highest in Chinese plume. The mean concentrations of BC, OC, WSOC and SO42- in Chinese plume were 1.9�}0.92, 5.5�}1.3, 2.0�}1.1 and 6.7�}4.1 ƒÊg m-3, respectively. The observed slope �E#162;BC/�E#162;CO =9.2 (ng m-3/ppbv) will be compared with emission inventory data over China. K+ shows good correlations with SO42- and NO3- signifying role of combustion related process like biomass burning.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 4801 Aerosols (0305, 4906)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting