Journal Article

PreJuSER-4682

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Formation of submicron sulfate and organic aerosols in the outflow from the urban region of the Pearl River Delta in China

Xiao, R. ; Takegawa, N. ; Kondo, Y. ; Miyazaki, Y. ; Miyakawa, T. ; Hu, M. ; Shao, M. ; Zeng, L. M. ; Hofzumahaus, A.FZJ* ; Holland, F.FZJ* ; Lu, K. ; Sugimoto, N. ; Zhao, Y. ; Zhang, Y. H.

2009
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.atmosenv.2009.04.028

Abstract: Size-resolved chemical compositions of non-refractory submicron aerosols were measured using a quadrupole Aerodyne aerosol mass spectrometer at a rural site near Guangzhou in the Pearl River Delta (PRD) of China in the summer of 2006. Two cases characterized as the outflows from the PRD urban region with plumes of high SO2 concentration were investigated. The evolution of sulfate size distributions was observed on a timescale of several hours. Namely mass concentrations of sulfate in the condensation mode (with vacuum aerodynamic diameters (D-va) < 300 nm) increased at a rate of about 0.17-0.37 ppbv h(-1) during the daytime. This finding was consistent with the sulfuric acid production rates of about 0.17-0.3 ppbv h(-1), as calculated from the observed gas-phase concentrations of OH (similar to 3.3 x 10(6)-1.7 x 10(7) cm(-3)) and SO2 (similar to 3-21.2 ppbv). This implies that the growth of sulfate in the condensation mode was mainly due to gas-phase oxidation of SO2. The observed rapid increase was caused mainly by the concurrent high concentrations of OH and SO2 in the air mass. The evolution of the mass size distributions of m/z 44, a tracer for oxygenated organic aerosol (OOA), was very similar to that of sulfate. The mass loadings of m/z 44 were strongly correlated with those of sulfate (r(2) = 0.99) in the condensation mode, indicating that ODA might also be formed by the gas-phase oxidation of volatile organic compound (VOC) precursors. It is likely that sulfate and ODA were internally mixed throughout the whole size range in the air mass. (C) 2009 Elsevier Ltd. All rights reserved.

Keyword(s): J ; Sulfate (auto) ; Organic aerosol (auto) ; Size distribution (auto) ; Gas-phase oxidation (auto) ; Outflow of the PRD urban region (auto)

Note: This research was supported by China National Basic Research and Development Programs 2002CB410801 and 2002CB211605. This work also was supported by the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) and the global environment research fund of the Japanese Ministry of the Environment (B-083). We thank the China Scholarship Council for the scholarship supporting R. Xiao at the University of Tokyo, Japan. The authors thank D. Kodama, M. Shiraiwa. S. Han, P. Lin, and Z. Deng for their support of the field experiments and Dr. X.D. Liu at the Chinese Research Academy of Environmental Sciences and Dr. Y.F. Cheng at the Leibniz-lnstitute for Tropospheric Research for their constructive suggestions. We also would like to thank the anonymous reviewers for their helpful comments.

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Research Program(s):

1. Atmosphäre und Klima (P22)

Appears in the scientific report 2009

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