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Seasonal characteristics of oxalic acid and related SOA in the free troposphere of Mt. Hua, central China: Implications for sources and formation mechanisms
Meng, JJ (Meng, Jingjing)[ 1,2 ]; Wang, GH (Wang, Gehui)[ 1,3 ]; Li, JJ (Li, Jianjun)[ 1 ]; Cheng, CL (Cheng, Chunlei)[ 1,2 ]; Ren, YQ (Ren, Yanqin)[ 1,2 ]; Huang, Y (Huang, Yao)[ 1,2 ]; Cheng, YT (Cheng, Yuting)[ 1,2 ]; Cao, JJ (Cao, Junji)[ 1 ]; Zhang, T (Zhang, Ting)[ 1 ]
2014-09-15
Source PublicationSCIENCE OF THE TOTAL ENVIRONMENT
Volume493Pages:1088-1097
Subtype期刊论文
Abstract

PM10 aerosols from the summit of Mt. Hua (2060 m a.s.l) in central China during the winter and summer of 2009 were analyzed for dicarboxylic acids, ketocarboxylic acids and alpha-dicarbonyls. Molecular composition of dicarboxylic acids (C-2-C-11) in the free tropospheric aerosols reveals that oxalic acid (C-2, 399 +/- 261 ng m(-3) in winter and 522 +/- 261 ng m(-3) in summer) is the most abundant species in both seasons, followed by malonic (C-3) and succinic (C-4) acids, being consistent with that on ground levels. Most of the diacids are more abundant in summer than in winter, but adipic (C-6) and phthalic (Ph) acids are twice lower in summer, suggesting more significant impact of anthropogenic pollution on the wintertime alpine atmosphere. Moreover, glyoxal (Gly) and methylglyoxal (mGly) are also lower in summer (12 +/- 6.1 ng m(-3)) than in winter (22 +/- 13 ng m(-3)). As both dicarbonyls are a major precursor of C-2, their seasonal variation patterns, which are opposite to those of the diacids, indicate that the mountain troposphere is more oxidative in summer. C-2 showed strong linear correlations with levoglucosan in winter and oxidation products of isoprene and monoterpane in summer. PCA analysis further suggested that the wintertime C-2 and related SOA in the Mt Hua troposphere mostly originate from photochemical oxidations of anthropogenic pollutants emitted from biofuel and coal combustion in lowland regions. On contrast, the summertime C-2 and related SOA mostly originate from further oxidation of the mountainous isoprene and monoterpene oxidation products. The AIM model calculation results showed that oxalic acid concentration well correlated with particle acidity (R-2 = 0.60) but not correlated with particle liquid water content, indicating that particle acidity favors the organic acid formation because aqueous-phase C-2 production is the primary mechanism of C-2 formation in ambient aerosols and is driven by acid-catalyzed oxidation.

KeywordDicarboxylic Acids Glyoxal And methylGlyoxal Secondary Organic Aerosols Free Troposphere Seasonality Sources And Formation Mechanisms
DOI10.1016/j.scitotenv.2014.04.086
Indexed BySCI ; EI
Language英语
Citation statistics
Cited Times:13[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/9761
Collection粉尘与环境研究室
Corresponding AuthorWang, GH (Wang, Gehui)[ 1,3 ]
Affiliation1.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China;
2.University of Chinese Academy of Sciences, Beijing 100049, China;
3.School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, China
Recommended Citation
GB/T 7714
Meng, JJ ,Wang, GH ,Li, JJ ,et al. Seasonal characteristics of oxalic acid and related SOA in the free troposphere of Mt. Hua, central China: Implications for sources and formation mechanisms[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2014,493:1088-1097.
APA Meng, JJ .,Wang, GH .,Li, JJ .,Cheng, CL .,Ren, YQ .,...&Zhang, T .(2014).Seasonal characteristics of oxalic acid and related SOA in the free troposphere of Mt. Hua, central China: Implications for sources and formation mechanisms.SCIENCE OF THE TOTAL ENVIRONMENT,493,1088-1097.
MLA Meng, JJ ,et al."Seasonal characteristics of oxalic acid and related SOA in the free troposphere of Mt. Hua, central China: Implications for sources and formation mechanisms".SCIENCE OF THE TOTAL ENVIRONMENT 493(2014):1088-1097.
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