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Water-soluble dicarboxylic acids in the tropospheric aerosols collected over East Asia and western North Pacific by ACE-Asia/C-130 aircraft

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Title: Water-soluble dicarboxylic acids in the tropospheric aerosols collected over East Asia and western North Pacific by ACE-Asia/C-130 aircraft
Authors: Kawamura, K. Browse this author →KAKEN DB
Umemoto, N. Browse this author
Mochida, M. Browse this author
Bertram, T. Browse this author
Howell, S. Browse this author
Huebert, B. J. Browse this author
Keywords: Aerosols and particles
Pollution--urban and regional
Troposphere--composition and chemistry
Troposphere--constituent transport and
Pacific Ocean
Issue Date: 1-Oct-2003
Publisher: American Geophysical Union
Journal Title: Journal of Geophysical Research. Atmosphere
Volume: 108
Issue: D23
Start Page: 8639
Publisher DOI: 10.1029/2002JD003256
Abstract: Tropospheric aerosols were collected during C-130 aircraft campaign over the East Asia/Pacific region in April to May 2001 and were analyzed for low molecular weight dicarboxylic acids. Homologous series of C2-C5 dicarboxylic acids were detected, for the first time, in the polluted troposphere in the Asian region using aircraft. Oxalic acid (C2) was found to be the most abundant species followed by malonic (C3) or succinic (C4) acid. Total concentrations of C2-C5 diacids (44-870 ngm^-3, av. 310 ngm^-3) are similar to those reported in urban Tokyo near the ground level. Concentrations of oxalic acid showed a positive correlation (r^2 = 0.70) with total organic carbon (TOC), although other diacids showed weaker positive correlation. These results suggest that water-soluble dicarboxylic acids and TOC were emitted from similar sources on the ground in the Asian continent and/or produced by the photochemical oxidation of anthropogenic organic compounds in the atmosphere. The diacid-carbons were found to comprise 0.2 to 3.3 % (average, 1.8 %) of TOC. Water-soluble dicarboxylic acids may play an important role in controlling the chemical and physical properties of organic aerosols in the polluted troposphere over the East Asia and western Pacific.
Rights: An edited version of this paper was published by AGU. Copyright 2003 American Geophysical Union.
Type: article (author version)
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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