Journal of Korean Society for Atmospheric Environment (한국대기환경학회지)

Korean Society for Atmospheric Environment (한국대기환경학회)
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The Aerosol Characteristics in Coexistence of Asian Dust and Haze during 15~17 March, 2009 in Seoul

짙은 황사와 연무가 공존한 대기의 에어러솔 특성 - 2009년 3월 15~17일 -

  • Lee, Hae-Young (Asian Dust Research Laboratory, National Institute of Meteorological Research) ;
  • Kim, Seung-Bum (Asian Dust Research Laboratory, National Institute of Meteorological Research) ;
  • Kim, Su-Min (Asian Dust Research Laboratory, National Institute of Meteorological Research) ;
  • Song, Seung-Joo (Asian Dust Research Laboratory, National Institute of Meteorological Research) ;
  • Chun, Young-Sin (Asian Dust Research Laboratory, National Institute of Meteorological Research)
  • 이해영 (국립기상연구소 황사연구과) ;
  • 김승범 (국립기상연구소 황사연구과) ;
  • 김수민 (국립기상연구소 황사연구과) ;
  • 송승주 (국립기상연구소 황사연구과) ;
  • 전영신 (국립기상연구소 황사연구과)
  • Received : 2010.10.06
  • Accepted : 2011.01.13
  • Published : 2011.04.30
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Abstract

The variation of the physicochemical properties of atmospheric aerosols in coexistence of the heavy Asian Dust and Haze observed from $15^{th}$ to $17^{th}$ March 2009 in Seoul was scrutinized through the mass and ion concentration observations and synoptic weather analysis. Although the ratio of PM1.0/PM10 was constant at 0.3 (which is typical during Asian Dust period in Korea) during the measurement period, both PM10 and PM1.0 mass concentrations were 3~6 times and 2~4 times higher than that of clear days, respectively. Water-soluble ion components accounted for 30~50% of PM10 and 50~70% of PM1.0 mass concentration. One of the secondary pollutants, $NO_3^-$ was found to be associated with $Ca^{2+}$ and $Na^+$ in coarse mode indicating that the aerosol derived from natural source was affected by anthropogenic pollutants. While the acidity of the aerosols increased in fine mode when the stagnation of weather patterns was the strongest (March $16^{th}$), the alkalinity increased in coarse mode when new air masses arrived with a southwestern wind after ending a period of stagnation (March $17^{th}$). In the selected case, SOR (Sulfur Oxidation Ratio, $nSO_4^{2-}/[nSO_4^{2-}+nSO_2]$) and NOR (Nitrogen Oxidation Ratio, $nNO_3^-/[nNO_3^-+nNO_2]$) values of ion components were higher than the general values during Asian Dust period. These results imply that dust aerosols could be mixed with pollutants transported from China even in heavy Asian Dust cases in Korea.

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References

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