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Time-resolved variations in the distributions of inorganic ions, carbonaceous components, dicarboxylic acids and related compounds in atmospheric aerosols from Sapporo, northern Japan during summertime

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Title: Time-resolved variations in the distributions of inorganic ions, carbonaceous components, dicarboxylic acids and related compounds in atmospheric aerosols from Sapporo, northern Japan during summertime
Authors: Pavuluri, Chandra Mouli Browse this author
Kawamura, Kimitaka Browse this author →KAKEN DB
Kikuta, Motomi Browse this author
Tachibana, Eri Browse this author
Aggarwal, Shankar G. Browse this author
Keywords: Inorganic ions
Organic carbon
WSOC
Dicarboxylic acids
Ketoacids
α-Dicarbonyls
Time-resolved variation
Long-range transport
Issue Date: Dec-2012
Publisher: Elsevier
Journal Title: Atmospheric Environment
Volume: 62
Start Page: 622
End Page: 630
Publisher DOI: 10.1016/j.atmosenv.2012.08.063
Abstract: To better understand time-resolved variations of water-soluble organic aerosols in the atmosphere, we collected atmospheric particles (TSP) every 3 h during summertime (8-10 August, 2005) in Sapporo, northern Japan. We measured inorganic ions, carbonaceous components, dicarboxylic acids, ketoacids and α-dicarbonyls in TSP. SO4^[2-] was found as the most abundant ionic species (57 ± 9% of total ions determined) followed by NH4+ and NO3-. However, none of the ionic species showed any diurnal trend throughout the campaign. Organic carbon (OC) ranged from 2.1 to 12.1 μg m^[-3] whereas elemental carbon (EC) was negligible in most of the samples (0.31 ± 0.56 μg m^[-3]). Oxalic (C2) acid was the most abundant diacid species, followed by malonic (C3) and succinic (C4) acids. Water-soluble OC (WSOC), water-insoluble OC (WIOC) and OC as well as dominant diacids (C2-C4), total diacids, ketoacids and α-dicarbonyls did not show diurnal trend on 8 August, but they showed clear diurnal distributions during 9-10 August following the changes in ambient temperature (and radiation). Detailed analyses of time-resolved aerosols demonstrate that diurnal variations of organic aerosol compositions are caused by local in situ photochemical production, but are significantly superimposed by long-range atmospheric transport of aerosols, particularly when the air masses are enriched with emissions from higher plants and/or biomass burning, and their photochemical processing during the transport.
Type: article (author version)
URI: http://hdl.handle.net/2115/51069
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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