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Changes in the ångstrom exponent during aerosol coagulation and condensation

Title
Changes in the ångstrom exponent during aerosol coagulation and condensation
Authors
Jung C.H.Lee J.Y.Kim Y.P.
Ewha Authors
김용표
SCOPUS Author ID
김용표scopus
Issue Date
2012
Journal Title
Asian Journal of Atmospheric Environment
ISSN
1976-6912JCR Link
Citation
vol. 6, no. 4, pp. 304 - 313
Indexed
SCOPUS; KCI scopus
Abstract
In this study, the Ångstrom exponent for polydispersed aerosol during dynamic processes was investigated. Log-normal aerosol size distribution was assumed, and a sensitivity analysis of the Ångstrom exponent with regards the coagulation and condensation process was performed. The Ångstrom exponent is expected to decrease because of the particle growth due to coagulation and condensation. However, it is difficult to quantify the degree of change. In order to understand quantitatively the change in the Ångstrom exponent during coagulation and condensation, different real and imaginary parts of the refractive index were considered. The results show that the Ångstrom exponent is sensitive to changes in size distribution and refractive index. The total number concentration decreases and the geometric mean diameter of aerosols increase during coagulation. On the while, the geometric standard deviation approaches monodispersed size distribution during the condensation process, and this change in size distribution affects the Ångstrom exponent. The degree of change in the Ångstrom exponent depends on the refractive index and initial size distribution, and the size parameter changes with the Ångstrom exponent for a given refractive index or chemical composition; this indicates that the size distribution plays an important role in determining the Ångstrom exponent as well as the chemical composition. Subsequently, this study shows how the Ångstrom exponent changes quantitatively during the aerosol dynamics processes for a log-normal aerosol size distribution for different refractive indices; the results showed good agreement with the results for simple analytic size distribution solutions.
DOI
10.5572/ajae.2012.6.4.304
Appears in Collections:
엘텍공과대학 > 화학신소재공학전공 > Journal papers
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