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High abundances of oxalic, azelaic, and glyoxylic acids and methylglyoxal in the open ocean with high biological activity: Implication for secondary OA formation from isoprene

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Title: High abundances of oxalic, azelaic, and glyoxylic acids and methylglyoxal in the open ocean with high biological activity: Implication for secondary OA formation from isoprene
Authors: Bikkina, Srinivas Browse this author
Kawamura, Kimitaka Browse this author →KAKEN DB
Miyazaki, Yuzo Browse this author →KAKEN DB
Fu, Pingqing Browse this author
Keywords: organic aerosols
diacids
isoprene-SOA
North Pacific
marine aerosols
Issue Date: 28-May-2014
Publisher: American Geophysical Union
Journal Title: Geophysical Research Letters
Volume: 41
Issue: 10
Start Page: 3649
End Page: 3657
Publisher DOI: 10.1002/2014GL059913
Abstract: Atmospheric dicarboxylic acids (DCA) are a ubiquitous water-soluble component of secondary organic aerosols (SOA), which can act as cloud condensation nuclei (CCN), affecting the Earth's climate. Despite the high abundances of oxalic acid and related compounds in the marine aerosols, there is no consensus on what controls their distributions over the open ocean. Marine biological productivity could play a role in the production of DCA, but there is no substantial evidence to support this hypothesis. Here we present latitudinal distributions of DCA, oxoacids and -dicarbonyls in the marine aerosols from the remote Pacific. Their concentrations were found several times higher in more biologically influenced aerosols (MBA) than less biologically influenced aerosols. We propose isoprene and unsaturated fatty acids as sources of DCA as inferred from significantly higher abundances of isoprene-SOA tracers and azelaic acid in MBA. These results have implications toward the reassessment of climate forcing feedbacks of marine-derived SOA.
Rights: Copyright 2014 American Geophysical Union.
Type: article
URI: http://hdl.handle.net/2115/57474
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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