Approximated expression of the hygroscopic growth factor for polydispersed aerosols

Chang H. Jung, Young Jun Yoon, Junshik Um, Seoung Soo Lee, Kyung Man Han, Hye Jung Shin, Ji Yi Lee, Yong Pyo Kim

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2 Scopus citations

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.

Original languageEnglish
Article number105670
JournalJournal of Aerosol Science
Volume151
DOIs
StatePublished - Jan 2021

Keywords

  • Aerosol size distribution
  • Analytical approximated expression
  • Hygroscopic growth factor
  • Polydispersed aerosol
  • Scattering enhancement factor

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