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http://dx.doi.org/10.5572/ajae.2013.7.3.129

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)
Publication Information
Asian Journal of Atmospheric Environment / v.7, no.3, 2013 , pp. 129-138 More about this Journal
Abstract
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.
Keywords
$PM_{2.5}$; Size distribution; Hygroscopic growth; Growth curve; Scattering coefficient;
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