COMPARISON OF AEROSOL COMPOSITION DURING TWO POLLUTION EPISODES CAUSED BY CONTRASTING WEATHER CONDITIONS
- COMPARISON OF AEROSOL COMPOSITION DURING TWO POLLUTION EPISODES CAUSED BY CONTRASTING WEATHER CONDITIONS
- 김진영; 김상우; 김영성; 송철한; 윤순창
- Aerosol; Northeast Asia; Continental outflow; Gosan; Pollution episode; Stagnation
- Issue Date
- International workshop on: Atmospheric Composition Changes: Climate-Chemistry Interactions
- 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.
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