Secondary formation of oxalic acid and related organic species from biogenic sources in a larch forest at the northern slope of Mt. Fuji

Mochizuki, Tomoki; Kawamura, Kimitaka; Miyazaki, Yuzo; Wada, Ryuichi; Takahashi, Yoshiyuki; Saigusa, Nobuko; Tani, Akira

Secondary formation of oxalic acid and related organic species from biogenic sources in a larch forest at the northern slope of Mt. Fuji

Mochizuki, Tomoki; Kawamura, Kimitaka; Miyazaki, Yuzo et al.

Atmospheric environment, 2017, 166, 255-262

Permalink : https://hdl.handle.net/2115/74956

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アクセス権	open access
URI	https://hdl.handle.net/2115/74956
タイトル	Secondary formation of oxalic acid and related organic species from biogenic sources in a larch forest at the northern slope of Mt. Fuji
著者	Mochizuki, Tomoki ; Kawamura, Kimitaka ; Miyazaki, Yuzo ; Wada, Ryuichi ; Takahashi, Yoshiyuki ; Saigusa, Nobuko ; Tani, Akira
著者名 Mochizuki, Tomoki
e-Rad_Researcher 70201449 著者名 Kawamura, Kimitaka
e-Rad_Researcher 60376655 著者名 Miyazaki, Yuzo
著者名 Wada, Ryuichi
著者名 Takahashi, Yoshiyuki
著者名 Saigusa, Nobuko
著者名 Tani, Akira
言語	英語
キーワード	Water-soluble organic aerosol
	Oxalic acid
	Unsaturated fatty acids
	Larix kaempferi forest
	Terpenes
	Ozone
発行日	2017-07-18
出版者	Elsevier
収録物名	Atmospheric environment
巻(号)	166
ページ	255-262
抄録	To better understand the formation of water-soluble organic aerosols in the forest atmosphere, we measured low molecular weight (LMW) dicarboxylic acids, oxocarboxylic acids, alpha-dicarbonyls, unsaturated fatty acids (UFAs), and water-soluble organic carbon (WSOC) in aerosols from a Larix kaempferi forest located at the northern slope of Mt. Fuji, Japan, in summer 2012. Concentrations of dicarboxylic acids, oxocarboxylic acids, alpha-dicarbonyls, and WSOC showed maxima in daytime. Relative abundance of oxalic acid in LMW dicarboxylic acids was on average 52% and its average concentration was 214 ng m(-3). We found that diurnal and temporal variations of oxalic acid are different from those of isoprene and alpha-pinene, whereas biogenic secondary organic aerosols (BSOAs) derived from isoprene and alpha-pinene showed similar variations with oxalic acid. The mass concentration ratios of oxalic acid/BSOAs were relatively constant, although a large variation in the concentrations of toluene that is an anthropogenic volatile organic compound was observed. These results suggest that formation of oxalic acid is associated with the oxidation of isoprene and alpha-pinene with O-3 and other oxidants in the forest atmosphere. In addition, concentrations of UFAs were observed, for the first time, to decrease dramatically during daytime in the forest. Mass concentration ratios of azelaic acid to UFAs showed a positive correlation with O-3, suggesting that UFAs are oxidized to yield azelaic acid, which may be further decomposed to oxalic acid in the forest atmosphere. We found that contributions of oxalic acid to WSOC are significantly high ranging from 3.7 to 9.7% (average 6.0%). This study demonstrates that forest ecosystem is an important source of oxalic acid and other dicarboxylic acids in the atmosphere. (c) 2017 Elsevier Ltd. All rights reserved.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
権利情報	© 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
PISSN	1352-2310
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1016/j.atmosenv.2017.07.028