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Analytic expression for the aerosol mass efficiencies for polydispersed accumulation mode

Title
Analytic expression for the aerosol mass efficiencies for polydispersed accumulation mode
Authors
Jung C.H.Um J.Bae S.Y.Yoon Y.J.Lee S.S.Lee J.Y.Kim Y.P.
Ewha Authors
김용표이지이
SCOPUS Author ID
김용표scopus
Issue Date
2018
Journal Title
Aerosol and Air Quality Research
ISSN
1680-8584JCR Link
Citation
Aerosol and Air Quality Research vol. 18, no. 6, pp. 1503 - 1514
Keywords
Analytical approachMass absorption efficiencyMass scattering efficiencyMie theoryPolydisperse aerosol particles
Publisher
AAGR Aerosol and Air Quality Research
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
Aerosol mass efficiencies for extinction, scattering, and absorption are important parameters to understand aerosol optical properties. Although the mass efficiency is functions of the refractive index and particle size distribution, due to the complexity of the efficiency, mass efficiency parameters are usually regarded as a size independent and assumed to depend mainly on the chemical composition of aerosols. In this study, we calculated the mass efficiencies of polydispersed aerosols based on different aerosol types. An analytical approach to the approximated formula of the mass efficiency of each chemical species was developed and evaluated by fitting the results to those of the Mie theory that calculated the optical properties of chemical species based on the refractive index and size. We used the lognormal size distributions and external mixture approximations that represent the polydispersity of aerosol particles. Size ranges of 0.5–2.5 µm in the geometric mean diameter were considered for five different chemical species. The parameters of fitting curves were generalized for polydispersed aerosols as functions of the geometric mean diameter and the geometric standard deviation. The results of the newly developed analytic approach showed a good agreement with those of the Mie theory. The proposed approach provides an effective means to estimate the mass extinction efficiency of polydispersed multi-component aerosols. © Taiwan Association for Aerosol Research.
DOI
10.4209/aaqr.2018.02.0067
Appears in Collections:
엘텍공과대학 > 화학신소재공학전공 > Journal papers
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