COMPARISON OF AEROSOL COMPOSITION DURING TWO POLLUTION EPISODES CAUSED BY CONTRASTING WEATHER CONDITIONS

Title
COMPARISON OF AEROSOL COMPOSITION DURING TWO POLLUTION EPISODES CAUSED BY CONTRASTING WEATHER CONDITIONS
Authors
김진영김상우김영성송철한윤순창
Keywords
Aerosol; Northeast Asia; Continental outflow; Gosan; Pollution episode; Stagnation
Issue Date
2009-11
Publisher
International workshop on: Atmospheric Composition Changes: Climate-Chemistry Interactions
Abstract
Aerosol composition measured at Gosan, Korea during two pollution episodes caused by stagnation and continental outflow was compared. Pollution levels were significantly high and even comparable with heavily polluted urban cities in China and Korea, although Gosan is the internationally well-known remote background site. Space-borne MODIS measurements clearly show that the pollution plume with high aerosol optical depth (AOD) overlaid and very slowly moved over Northeast Asia during the stagnation episode. On the other hand, a strong synoptic wind transported the plume from eastern China to its downwind regions during the continental outflow episode. The two pollution episodes showed discriminative aerosol chemical compositions associated with different source regions. Concentrations of nss (non-sea-salt)-sulfates and ammonium in the continental outflow episode were almost two times higher than those in the stagnation episode due to the influence of anthropogenic emissions from China. A higher fraction of nitrate, accompanied with an increase of carbonaceous species in the stagnation episode, was attributable to vehicular emissions originating from Korea.
URI
http://pubs.kist.re.kr/handle/201004/36464
Appears in Collections:
KIST Publication > Conference Paper
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