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Approximated expression of the hygroscopic growth factor for polydispersed aerosols

Title
Approximated expression of the hygroscopic growth factor for polydispersed aerosols
Authors
Jung C.H.Yoon Y.J.Um J.Lee S.S.Han K.M.Shin H.J.Lee J.Y.Kim Y.P.
Ewha Authors
김용표이지이
SCOPUS Author ID
김용표scopus; 이지이scopus
Issue Date
2021
Journal Title
Journal of Aerosol Science
ISSN
0021-8502JCR Link
Citation
Journal of Aerosol Science vol. 151
Keywords
Aerosol size distributionAnalytical approximated expressionHygroscopic growth factorPolydispersed aerosolScattering enhancement factor
Publisher
Elsevier Ltd
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
Hygroscopic growth of aerosols plays an important role in the characterization of atmospheric aerosols. Physico-chemical and optical properties of aerosols are dependent on relative humidity (RH) as well as on their size and composition. In this study, scattering enhancement factors, f(RH), for polydispersed aerosols were approximated. f(RH) of ammonium sulfate and ammonium nitrate (AS) and NaCl aerosols (ss) were considered under the assumption of externally mixed aerosols. f(RH) was calculated using the Mie theory for polydispersed aerosols at a given RH and corresponding water uptake (denoted as fMie(RH)). f(RH) was approximated as a quadratic function of RH (denoted as fapp(RH)). The obtained approximated f(RH) or fapp(RH)) values were compared with the values based on the Mie theory and showed a reasonable agreement between them. To the best of our knowledge, this is the first study that parametrizes the size dependency of f(RH) for log normally distributed aerosols. © 2020 The Authors
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DOI
10.1016/j.jaerosci.2020.105670
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엘텍공과대학 > 화학신소재공학전공 > Journal papers
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