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Diurnal and temporal variations of water-soluble dicarboxylic acids and related compounds in aerosols from the northern vicinity of Beijing: Implication for photochemical aging during atmospheric transport

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Title: Diurnal and temporal variations of water-soluble dicarboxylic acids and related compounds in aerosols from the northern vicinity of Beijing: Implication for photochemical aging during atmospheric transport
Authors: He, Nannan Browse this author
Kawamura, Kimitaka Browse this author →KAKEN DB
Okuzawa, K. Browse this author
Pochanart, P. Browse this author
Liu, Y. Browse this author
Kanaya, Y. Browse this author
Wang, Z. F. Browse this author
Keywords: Organic aerosols
Dicarboxylic acids
Oxalic acid
Glyoxylic acid
Photochemical aging
Aqueous-phase production
Issue Date: 15-Nov-2014
Publisher: Elsevier
Journal Title: Science of The Total Environment
Volume: 499
Start Page: 154
End Page: 165
Publisher DOI: 10.1016/j.scitotenv.2014.08.050
PMID: 25181047
Abstract: Aerosol samples were collected in autumn 2007 on day- and nighttime basis in the northern receptor site of Beijing, China. The samples were analyzed for total carbon (TC) and water-soluble dicarboxylic acids (C-2-C-12), oxocarboxylic adds (C-2-C-9), glyoxal and methylglyoxal to better understand the photochemical aging of organic aerosols in the vicinity of Beijing. Concentrations of TC are 50% greater in daytime when winds come from Beijing than in nighttime when winds come from the northern forest areas. Most diacids showed higher concentrations in daytime, suggesting that the organics emitted from the urban Beijing and delivered to the northern vicinity in daytime are subjected to photo-oxidation to result in diacids. However, oxalic acid (C-2), which is the most abundant diacid followed by C-3 or C-4, became on average 30% more abundant in nighttime together with azelaic, omega-oxooctanoic and omega-oxononanoic acids, which are specific oxidation products of biogenic unsaturated fatty acids. Methylglyoxal, an oxidation product of isoprene and a precursor of oxalic acid, also became 29% more abundant in nighttime. Based on a positive correlation between C-2 and glyoxylic acid (omega C-2) in nighttime when relative humidity significantly enhanced, we propose a nighttime aqueous phase production of C-2 via the oxidation of omega C-2. We found an increase in the contribution of diacids to TC by 3 folds during consecutive clear days. This study demonstrates that diacids and related compounds are largely produced in the northern vicinity of Beijing via photochemical processing of organic precursors emitted from urban center and forest areas. (C) 2014 Elsevier B.V. All rights reserved.
Type: article (author version)
URI: http://hdl.handle.net/2115/57656
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 河村 公隆

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