气候变化领域集成服务门户(CCPortal): Distributions and sources of low-molecular-weight monocarboxylic acids in gas and particles from a deciduous broadleaf forest in northern Japan

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DOI	10.5194/acp-19-2421-2019
	Distributions and sources of low-molecular-weight monocarboxylic acids in gas and particles from a deciduous broadleaf forest in northern Japan
	Mochizuki T.; Kawamura K.; Miyazaki Y.; Kunwar B.; Kumar Reddy Boreddy S.
发表日期	2019
ISSN	16807316
起始页码	2421
结束页码	2432
卷号	19 期号:4
英文摘要	To better understand the distributions and sources of low-molecular-weight (LMW) monocarboxylic acids (monoacids) in the forest atmosphere, we conducted simultaneous collection of gaseous and particulate samples at a deciduous broadleaf forest site in northern Japan. LMW normal (C 1 -C 10 ), branched (iC 4 -iC 6 ), hydroxyl (glycolic and lactic) and aromatic (benzoic) monoacids were detected in the gas and particle phases. The dominant LMW monoacids in gas phase were formic (mean: 953 ngm -3 ) and acetic (528 ngm -3 ) acids followed by propionic (37 ngm -3 ) or isopentanoic (42 ngm -3 ) acid. In the particle phase, isopentanoic (159 ngm -3 ) was dominant, followed by acetic (104 ngm -3 ) and formic (71 ngm -3 ) or lactic (65 ngm -3 ) acids. Concentrations of LMW monoacids did not show correlations with anthropogenic tracers such as nss-SO 4 2- and NO 3 - , indicating that anthropogenic contribution is not important. Concentrations of C 1 -C 6 monoacids in the gas phase showed positive correlations (r 2 D 0:21-0.91) with isobutyric acid (iC 4 ), which may be produced by microbial activity in soil. The forest soil may be a source of gaseous C 1 - C 6 monoacids in the forest atmosphere. Acetic acid in the particle phase positively correlated with nonanoic acid (C 9 ) (r 2 D 0:63), suggesting that formation of acetic and nonanoic acids is associated with the oxidation of biogenic unsaturated fatty acids in the aerosol phase, in addition to photochemical oxidation of biogenic volatile organic compounds. The particle-phase fractions (F p ) of formic and acetic acids showed negative correlation with ambient temperature (C 1 : r 2 D 0:49, C 2 : r 2 D 0:60) but showed positive correlation with relative humidity (C 1 : r 2 D 0:30, C 2 : r 2 D 0:55) in daytime, suggesting that these meteorological parameters are important for the gas and particle portioning of monoacids in the forest atmosphere. © 2019 Copernicus GmbH. All Rights Reserved.
语种	英语
scopus关键词	aerosol; atmospheric gas; broad-leaved forest; carboxylic acid; correlation; source identification; temporal distribution; Japan
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144620
作者单位	Institute of Low Temperature Science, Hokkaido University, Sapporo, Japan; Chubu Institute for Advanced Studies, Chubu University, Kasugai, Japan; School of Food and Nutritional Science, University of Shizuoka, Shizuoka, Japan
推荐引用方式 GB/T 7714	Mochizuki T.,Kawamura K.,Miyazaki Y.,et al. Distributions and sources of low-molecular-weight monocarboxylic acids in gas and particles from a deciduous broadleaf forest in northern Japan[J],2019,19(4).
APA	Mochizuki T.,Kawamura K.,Miyazaki Y.,Kunwar B.,&Kumar Reddy Boreddy S..(2019).Distributions and sources of low-molecular-weight monocarboxylic acids in gas and particles from a deciduous broadleaf forest in northern Japan.Atmospheric Chemistry and Physics,19(4).
MLA	Mochizuki T.,et al."Distributions and sources of low-molecular-weight monocarboxylic acids in gas and particles from a deciduous broadleaf forest in northern Japan".Atmospheric Chemistry and Physics 19.4(2019).