Asian Journal of Atmospheric Environment

  • 제7권3호
  • /
  • Pages.129-138
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  • 2013
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  • 1976-6912(pISSN)
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  • 2287-1160(eISSN)
한국대기환경학회 (Korean Society for Atmospheric Environment)
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Physical, Chemical and Optical Properties of Fine Aerosol as a Function of Relative Humidity at Gosan, Korea during ABC-EAREX 2005

  • Moon, Kwang-Joo (Department of Air Quality Research, Climate and Air Quality Research Division, National Institute of Environmental Research, Environmental Research Complex) ;
  • Han, Jin-Seok (Department of Air Quality Research, Climate and Air Quality Research Division, National Institute of Environmental Research, Environmental Research Complex) ;
  • Cho, Seog-Yeon (Department of Environmental Engineering, Inha University)
  • 투고 : 2012.07.19
  • 심사 : 2013.06.12
  • 발행 : 2013.09.30
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초록

The water uptake by fine aerosol in the atmosphere has been investigated at Gosan, Korea during ABC-EAREX 2005. The concentration of inorganic ion and carbon components, size distribution, and light scattering coefficients in normal and dry conditions were simultaneously measured for $PM_{2.5}$ by using a parallel integrated monitoring system. The result of this study shows that ambient fine particles collected at Gosan were dominated by water-soluble ionic species (35%) and carbonaceous materials (18%). In addition, it shows the large growth of aerosol in the droplet mode when RH is higher than 70%. Size distribution of the particulate surface area in a wider size range ($0.07-17{\mu}m$) shows that the elevation of RH make ambient aerosol grow to be the droplet mode one around $0.6{\mu}m$ or the coarse mode one, larger than $2.5{\mu}m$. Hygroscopic factor data calculated from the ratio of aerosol scattering coefficients at a given ambient RH and a reference RH (25%) show that water uptake began at the intermediate RH range, from 40% to 60%, with the average hygroscopic factor of 1.10 for 40% RH, 1.11 for 50% RH, and 1.17 for 60% RH, respectively. Finally, average chemical composition and the corresponding growth curves were analyzed in order to investigate the relationship between carbonaceous material fraction and hygroscopicity. As a result, the aerosol growth curve shows that inorganic salts such as sulphate and nitrate as well as carbonaceous materials including OC largely contribute to the aerosol water uptake.

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참고문헌

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