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Chemical Composition Based Aerosol Optical Properties According to Size Distribution and Mixture Types during Smog and Asian Dust Events in Seoul, Korea

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Abstract

This study investigated the optical properties of aerosols involved in different meteorological events, including smog and Asian dust days. Carbonaceous components and inorganic species were measured in Seoul, Korea between 25 and 31 March 2012. Based on the measurements, the optical properties of aerosols were calculated by considering composition, size distribution, and mixing state of aerosols. To represent polydisperse size distributions of aerosols, a lognormal size distribution with a wide range of geometric mean diameters and geometric standard deviations was used. For the optical property calculations, the Mie theory was used to compute single-scattering properties of aerosol particles with varying size and composition. Analysis of the sampled data showed that the water-soluble components of organic matter increased on smog days, whereas crustal elements increased on dust days. The water content significantly influenced the optical properties of aerosols during the smog days as a result of high relative humidity and an increase in the water-soluble component. The absorption coefficients depended on the aerosol mixture type and the aerosol size distributions. Therefore, to improve our knowledge on radiative impacts of aerosols, especially the regional impacts of aerosols in East Asia, accurate measurements of aerosols, such as size distribution, composition, and mixture type, under different meteorological conditions are required.

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Authors and Affiliations

  1. Department of Health Management, Kyungin Women’s University, 63, Gyeyangsan-ro, Gyeyang-gu, Incheon, 21041, Korea

    Chang Hoon Jung

  2. Department of Environmental Engineering, Chosun University, Gwangju, Korea

    Ji Yi Lee

  3. Department of Atmospheric Sciences, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA

    Junshik Um

  4. Earth System Science Interdisciplinary Center, University of Maryland, College Park, Maryland, USA

    Seung Soo Lee

  5. Department of Chemical Engineering and Materials Science, Ewha Womans University, Seoul, Korea

    Yong Pyo Kim

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  1. Chang Hoon Jung
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  2. Ji Yi Lee
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  3. Junshik Um
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  4. Seung Soo Lee
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  5. Yong Pyo Kim
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Correspondence to Chang Hoon Jung.

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Jung, C.H., Lee, J.Y., Um, J. et al. Chemical Composition Based Aerosol Optical Properties According to Size Distribution and Mixture Types during Smog and Asian Dust Events in Seoul, Korea. Asia-Pacific J Atmos Sci 54, 19–32 (2018). https://doi.org/10.1007/s13143-017-0053-0

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  • DOI: https://doi.org/10.1007/s13143-017-0053-0

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