Spatio-seasonal characterization and emissions estimation of ozone-depleting substances in the Pearl River Delta, China

doi:10.1016/j.atmosenv.2023.119982

	He, Hui 1; Huang, Zhonghui 1; Xie, Danping 1; Liu, Wang 1; Huang, Zhongkun 1; Wang, Xinming2,3,4,5 ; Zhang, Yanli2,3,4,5 ; Zhang, Zhou 2,3,6; Yang, Leifeng 1; Zhan, Wensen 1; Peng, Jiangbo 1; Huang, Mingjian 1; Xu, Manning 1
	Spatio-seasonal characterization and emissions estimation of ozone-depleting substances in the Pearl River Delta, China
Source Publication	ATMOSPHERIC ENVIRONMENT
ISSN	1352-2310
	2023-10-01
Volume	310 Pages:9
DOI	10.1016/j.atmosenv.2023.119982
Language	英语
WOS Research Area	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
Abstract	Although chlorofluorocarbons (CFCs), CH3Br and chlorinated solvents such as CH3Cl3 and CCl4 have been entirely phased out in the Pearl River Delta (PRD) region, these compounds still exist chronically in atmosphere. In this study, ambient air samples were collected at twenty sites in the PRD region in winter (November to December 2019) and summer (August 2020) to characterize the spatio-seasonal variation of ozone-depleting substances (ODS), including CFC-11, CFC-12, CFC-113, CFC-114, CH3CCl3, CCl4, and CH3Br, and to estimate their emissions. Our observation showed that the average mixing ratios of the target ODS in the PRD region were 16.5%-92.5% lower compared with their reported levels in 2001 except for CFC-114, which basically remained at a constant level. Among the seven ODS, the average mixing ratio of CH3CCl3 declined most rapidly. The mixing ratios of the target ODS were higher in summer than in winter. Higher mixing ratios of the target ODS were observed in the two PRD urban background sites than the northern hemisphere background level, suggesting the existence of local emission sources. The spatial distribution indicated that the Foshan-Guangzhou-Dongguan-Shenzhen corridor area had the highest mixing ratios of the target ODS. Based on the CO-tracer ratio method, the estimated emissions of CFC-11, CFC-12, CFC-113, CFC-114, CH3Br, CH3CCl3 and CCl4 were 1.2, 0.8, 0.3, 0.2, 0.1, 0.1 and 0.4 kt/year, respectively. CFCs showed a very slow reduction in emission since 2008 in general, and the estimated emissions of CH3CCl3 and CCl4 gradually declined from the high value reported in 2004 while CH3Br kept the same level. The findings of this study can help to get a better understanding of the emissions status of ODS in the PRD region and provide valuable information for further reduction processes.
Keyword	Ozone depleting substances (ODS) Pearl river delta (PRD) Spatio-seasonal variation Tracer-ratio method Emissions estimation
WOS ID	WOS:001051028500001
Indexed By	SCI
Citation statistics
Document Type	期刊论文
Identifier	http://ir.gig.ac.cn/handle/344008/74717
Collection	有机地球化学国家重点实验室
Corresponding Author	Huang, Zhonghui
Affiliation	1.Minist Ecol & Environm, South China Inst Environm Sci, Guangdong Key Lab Water & Air Pollut Control, Guangzhou, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, Guangdong Key Lab Environm Protect & Resources Uti, Guangzhou, Peoples R China 4.CAS Ctr Excellence Deep Earth Sci, Guangzhou, Peoples R China 5.Univ Chinese Acad Sci, Beijing, Peoples R China 6.Chinese Acad Sci, Guangzhou Inst Geochem, Changsha Ctr Mineral Resources Explorat, Changsha, Peoples R China
Recommended Citation GB/T 7714	He, Hui,Huang, Zhonghui,Xie, Danping,et al. Spatio-seasonal characterization and emissions estimation of ozone-depleting substances in the Pearl River Delta, China[J]. ATMOSPHERIC ENVIRONMENT,2023,310:9.
APA	He, Hui.,Huang, Zhonghui.,Xie, Danping.,Liu, Wang.,Huang, Zhongkun.,...&Xu, Manning.(2023).Spatio-seasonal characterization and emissions estimation of ozone-depleting substances in the Pearl River Delta, China.ATMOSPHERIC ENVIRONMENT,310,9.
MLA	He, Hui,et al."Spatio-seasonal characterization and emissions estimation of ozone-depleting substances in the Pearl River Delta, China".ATMOSPHERIC ENVIRONMENT 310(2023):9.

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