气候变化领域集成服务门户(CCPortal): The spatial-temporal distribution characteristics of atmospheric chloromethane according to data from the CARE-China network

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DOI	10.1016/j.atmosenv.2021.118484
	The spatial-temporal distribution characteristics of atmospheric chloromethane according to data from the CARE-China network
	Sun J.; Xin J.; Hu B.; Song T.; Wang L.; Wu F.; Wang Y.
发表日期	2021
ISSN	1352-2310
卷号	260
英文摘要	The spatial and temporal distribution of atmospheric chloromethane (CH3Cl) in China was investigated between 2012 and 2014, and the sources of CH3Cl were evaluated by positive matrix factorization (PMF) according to PMF 5.0 (USEPA). Various concentrations of CH3Cl were found throughout China, ranging from 506.4 ± 110.5 to 1132.1 ± 523.3 pptv, showing the characteristics of high in the southeast and low in the northwest. The correlation between CH3Cl and chlorofluorocarbon-12 (CFC-12) at most sites was greater than 0.5 and presented regional characteristics. The distribution of CH3Cl in China is related to the degree of economic development, the high-concentration sites were located in the economically developed eastern region. The CH3Cl concentrations at western sites were similar to the global average and increased with latitude and altitude, indicating that this region was least affected by anthropogenic activities. The annual average concentrations of atmospheric CH3Cl in the northeastern region were below 730 pptv but had strong seasonal fluctuations. Chemical production was the main CH3Cl source in the northeast background areas (46%), while industrial combustion contributed 42% of the CH3Cl in the northeast urban areas. Large seasonal variations combined with a high relative standard deviation were observed in the southern region. Relative to the southwest, in the southeast, the onset of lower concentrations was delayed until September–October, and higher concentrations persisted for longer. Chemical production and biomass burning were the main sources in the southwest, while Chemical production and solvent use were the main contributors in the southeast. The Beijing area is discussed separately as a super megacity. No obvious seasonal fluctuations were observed in the Beijing area. According to the source analysis, chemical production contributed approximately 60% of the atmospheric CH3Cl in the Beijing area, while 15–24% was from solvent release. © 2021 Elsevier Ltd
关键词	CH3Cl Distribution characteristics Emission source Seasonal variation
语种	英语
scopus关键词	Atmospheric chemistry; Chemical analysis; Spatial distribution; Beijing area; Chemical production; Chloromethane; Distribution characteristics; Emission sources; Positive Matrix Factorization; Seasonal fluctuations; Seasonal variation; Spatial and temporal distribution; Spatial-temporal distribution; Factorization; chlorofluorocarbon; methyl chloride; solvent; atmospheric gas; biomass burning; combustion; methane; solvent; air pollution; altitude; analytic method; Article; biomass; chemical industry; China; combustion; concentration (parameter); economic development; gas chromatography; latitude; limit of detection; limit of quantitation; mass spectrometry; positive matrix factorization; seasonal variation; spatiotemporal analysis; urban area; Beijing [China]; China
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248343
作者单位	LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100191, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China
推荐引用方式 GB/T 7714	Sun J.,Xin J.,Hu B.,et al. The spatial-temporal distribution characteristics of atmospheric chloromethane according to data from the CARE-China network[J],2021,260.
APA	Sun J..,Xin J..,Hu B..,Song T..,Wang L..,...&Wang Y..(2021).The spatial-temporal distribution characteristics of atmospheric chloromethane according to data from the CARE-China network.ATMOSPHERIC ENVIRONMENT,260.
MLA	Sun J.,et al."The spatial-temporal distribution characteristics of atmospheric chloromethane according to data from the CARE-China network".ATMOSPHERIC ENVIRONMENT 260(2021).