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Spectral dependency of light scattering/absorption and hygroscopicity of pollution and dust aerosols in Northeast Asia

Title
Spectral dependency of light scattering/absorption and hygroscopicity of pollution and dust aerosols in Northeast Asia
Authors
Lee S.Yoon S.-C.Kim S.-W.Kim Y.P.Ghim Y.S.Kim J.-H.Kang C.-H.Kim Y.J.Chang L.-S.Lee S.-J.
Ewha Authors
김용표
SCOPUS Author ID
김용표scopus
Issue Date
2012
Journal Title
Atmospheric Environment
ISSN
1352-2310JCR Link
Citation
vol. 50, pp. 246 - 254
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Ground-based in-situ measurements were performed to investigate the spectral optical properties and hygroscopicity of light scattering and absorbing aerosols in pollution and dust plumes in Northeast Asia. The scattering ångström exponents of pollution plumes are high, ranging from 0.8 to 1.8, because light scattering aerosols consist of relatively fine particles such as sulfate, nitrate, ammonium and carbonaceous particles. Pollution case having high organic carbon (OC) exhibits a relatively high absorption ångström exponent (AAE), in the range of 1.0-1.5 due to the absorption by refractory OC at near-UV spectral region. Among the different pollution cases, the AAE is the highest in a polluted dust plume; this can be attributed to the strong wavelength dependence of light absorption by dust particles. The mass absorption cross section (MAC), which represents the ability of light-absorbing aerosols to absorb a photon, is 4.2-8.3m 2g -1, and it is high when black carbon is mixed with OC and dust particles. The MAC decreases with increasing relative humidity, especially for pollution plume with a high OC content and for dust plume. Under humid conditions, hygroscopic chemical species can absorb water vapor, thus growing in size and enhancing aerosol light scattering, but the MAC decreases because of the possible shielding effects of absorbing aerosols with water uptake. © 2011 Elsevier Ltd.
DOI
10.1016/j.atmosenv.2011.12.026
Appears in Collections:
엘텍공과대학 > 화학신소재공학전공 > Journal papers
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