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Atmosphere 2015, 6(2), 164-182; doi:10.3390/atmos6020164

PM2.5 Chemical Compositions and Aerosol Optical Properties in Beijing during the Late Fall

1
Key Laboratory of Reservoir Aquatic Environment of CAS, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
2
School of Chemistry and Environment, Beihang University, Beijing 100191, China
3
Key Lab of Aerosol Chemistry & Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China
4
School of Physics, Peking University, Beijing 100871, China
5
State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex, School of Environment, Tsinghua University, Beijing 100084, China
*
Author to whom correspondence should be addressed.
Academic Editors: Ru-Jin Huang and Robert W. Talbot
Received: 21 November 2014 / Revised: 31 December 2014 / Accepted: 7 January 2015 / Published: 26 January 2015
(This article belongs to the Special Issue Sources, Formation and Impacts of Secondary Aerosol)
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Abstract

Daily PM2.5 mass concentrations and chemical compositions together with the aerosol optical properties were measured from 8–28 November 2011 in Beijing. PM2.5 mass concentration varied from 15.6–237.5 μg∙m−3 and showed a mean value of 111.2 ± 73.4 μg∙m−3. Organic matter, NH4NO3 and (NH4)2SO4 were the major constituents of PM2.5, accounting for 39.4%, 15.4%, and 14.9% of the total mass, respectively, while fine soil, chloride salt, and elemental carbon together accounted for 27.7%. Daily scattering and absorption coefficients (σsc and σap) were in the range of 31.1–667 Mm−1 and 8.24–158.0 Mm−1, with mean values of 270 ± 200 Mm−1 and 74.3 ± 43.4 Mm−1. Significant increases in σsc and σap were observed during the pollution accumulation episodes. The revised IMPROVE algorithm was applied to estimate the extinction coefficient (bext). On average, organic matter was the largest contributor, accounting for 44.6% of bext, while (NH4)2SO4, NH4NO3, elemental carbon, and fine soil accounted for 16.3% 18.0%, 18.6%, and 2.34% of bext, respectively. Nevertheless, the contributions of (NH4)2SO4 and NH4NO3 were significantly higher during the heavy pollution periods than those on clean days. Typical pollution episodes were also explored, and it has been characterized that secondary formation of inorganic compounds is more important than carbonaceous pollution for visibility impairment in Beijing. View Full-Text
Keywords: PM2.5; visibility; aerosol optical properties; chemical composition PM2.5; visibility; aerosol optical properties; chemical composition
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Wang, H.; Li, X.; Shi, G.; Cao, J.; Li, C.; Yang, F.; Ma, Y.; He, K. PM2.5 Chemical Compositions and Aerosol Optical Properties in Beijing during the Late Fall. Atmosphere 2015, 6, 164-182.

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