Journal
ATMOSPHERIC CHEMISTRY AND PHYSICS
Volume 12, Issue 5, Pages 2381-2397Publisher
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/acp-12-2381-2012
Keywords
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Funding
- National Natural Science Foundation of China (NSFC) [40875001]
- German Science Foundation [DFG WI 1449/14-1]
- China 973 project [2011CB403402]
- NSFC [40975083]
- China Academy of Meteorological Sciences [2008Z011]
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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 (r(ext-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 r(ext-LAC). The diurnal variation of r(ext-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 r(ext-LAC) was found, with high values during the daytime and low values at night. The consistency between the retrieved r(ext-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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