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| Titel |
A new method to determine the mixing state of light absorbing carbonaceous using the measured aerosol optical properties and number size distributions |
| VerfasserIn |
N. Ma, C. S. Zhao, T. Müller, Y. F. Cheng, P. F. Liu, Z. Z. Deng, W. Y. Xu, L. Ran, B. Nekat, D. Pinxteren, T. Gnauk, K. Müller, H. Herrmann, P. Yan, X. J. Zhou, A. Wiedensohler |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 5 ; Nr. 12, no. 5 (2012-03-02), S.2381-2397 |
| Datensatznummer |
250010850
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| Publikation (Nr.) |
 copernicus.org/acp-12-2381-2012.pdf |
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| Zusammenfassung |
| In this paper, the mixing state of light absorbing carbonaceous (LAC) was
investigated with a two-parameter aerosol optical model and in situ aerosol
measurements at a regional site in the North China Plain (NCP). A closure
study between the hemispheric backscattering fraction (HBF) measured by an
integrating nephelometer and that calculated with a modified Mie model was
conducted. A new method was proposed to retrieve the ratio of the externally
mixed LAC mass to the total mass of LAC (rext-LAC) based on the
assumption that the ambient aerosol particles were externally mixed and
consisted of a pure LAC material and a core-shell morphology in which the
core is LAC and the shell is a less absorbing material. A Monte Carlo
simulation was applied to estimate the overall influences of input
parameters of the algorithm to the retrieved rext-LAC. The diurnal
variation of rext-LAC was analyzed and the PartMC-MOSAIC model was used
to simulate the variation of the aerosol mixing state. Results show that,
for internally mixed particles, the assumption of core-shell mixture is more
appropriate than that of homogenous mixture which has been widely used in
aerosol optical calculations. A significant diurnal pattern of the retrieved
rext-LAC was found, with high values during the daytime and low values
at night. The consistency between the retrieved rext-LAC and the model
results indicates that the diurnal variation of LAC mixing state is mainly
caused by the diurnal evolution of the mixing layer. |
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