Analytic Expression for the Aerosol Mass Efficiencies for Polydispersed Accumulation Mode
- 주제(키워드) Analytical approach , Polydisperse aerosol particles , Mass scattering efficiency , Mass absorption efficiency , Mie theory
- 주제(기타) Environmental Sciences
- 설명문(일반) [Jung, Chang H.] Kyungin Womens Univ, Dept Hlth Management, Incheon 21041, South Korea; [Um, Junshik] Pusan Natl Univ, Dept Atmospher & Environm Sci, Busan 46241, South Korea; [Bae, Soo Ya] Korea Inst Atmospher Predict Syst, Seoul 07071, South Korea; [Yoon, Young Jun] Korea Polar Res Inst, Incheon, South Korea; [Lee, Seoung Soo] Univ Maryland, Earth Syst Sci Interdisciplinary Ctr, College Pk, MD 20740 USA; [Lee, Ji Yi] Ewha Womans Univ, Dept Environm Sci & Engn, Seoul 03760, South Korea; [Kim, Yong Pyo] Ewha Womans Univ, Dept Chem Engn & Mat Sci, Seoul 03760, South Korea
- 관리정보기술 faculty
- 등재 SCIE, SCOPUS
- 발행기관 TAIWAN ASSOC AEROSOL RES-TAAR
- 발행년도 2018
- URI http://www.dcollection.net/handler/ewha/000000151480
- 본문언어 영어
- Published As http://dx.doi.org/10.4209/aaqr.2018.02.0067
초록/요약
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 mu m 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.
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