Journal of Korean Society for Atmospheric Environment (한국대기환경학회지)

Korean Society for Atmospheric Environment (한국대기환경학회)
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Ionic Compositions of PM10 and Reactive Gases during Asian Dust Events in March 2007

2007년 3월 서울 황사 사례의 PM10 이온조성과 반응성 기체 특성

  • Park, In-Ji (Department of Earth and Environmental Sciences, Korea University) ;
  • Lim, Sae-Hee (Laboratoire de Glaciologie et Geophysique de l'Environnement (LGGE), CNRS/University of Grenoble) ;
  • Lee, Mee-Hye (Department of Earth and Environmental Sciences, Korea University) ;
  • Lee, Young-Jae (Department of Earth and Environmental Sciences, Korea University) ;
  • Kim, Jeong-Soo (Air Quality Research Division, National Institute of Environmental Research)
  • Received : 2010.05.13
  • Accepted : 2011.06.27
  • Published : 2011.08.31
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Abstract

Asian dust evens took place in Seoul on 27~28 March and 31 March~1 April 2007, during which the mass and chemical compositions of $PM_{10}$ were measured at urban area in Seoul, Korea. In conjunction with $PM_{10}$ compositions, the behaviors of gas precursors such as CO, $O_3$, $SO_2$, and $NO_2$ and meteorological parameters and air mass trajectories were thoroughly examined. The earlier case was a weak dust incidence which was characterized by elevated concentrations of CO, $SO_2$ and $NO_2$ as well as secondary aerosols. In contrast, the later showed the trait of the dust aerosols associated with high $PM_{10}$ mass and $Ca^{2+}$ concentrations. In general, the fractions of ionic species against mass decreased with increase in dust loading. The ratios of ${SO_4}^{2-}$ to ${NO_3}^-$ and $SO_2$ to $NO_2$ were similar in temporal variations, suggesting the concentrations of secondary aerosols were sensitive to the level of precursor gases. In this study, $Na^+$ and $Cl^-$ were also highly elevated during the heavy dust episode, which is thought to have originated from alkaline soils spreading through the northeast regions of China.

Keywords

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