气候变化领域集成服务门户(CCPortal): Airborne Observations of CFCs Over Hebei Province, China in Spring 2016

CCPortal

DOI	10.1029/2021JD035152
	Airborne Observations of CFCs Over Hebei Province, China in Spring 2016
	Benish S.E.; Salawitch R.J.; Ren X.; He H.; Dickerson R.R.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:18
英文摘要	In Spring 2016, 27 whole air samples were collected from an aircraft ∼500–∼3,500 m over Hebei Province, China and analyzed for 16 halocarbons, including chlorofluorocarbons (CFCs). Mixing ratios (median, 25th–75th percentiles) of CFC-11 (281, 255–318 ppt), CFC-12 (546, 473–591 ppt), CFC-113 (79, 73–85 ppt), CFC-114 (22, 19–25 ppt), HCFC-22 (345, 308–432 ppt), and CCl4 (88, 75–104 ppt) were often observed to be higher than their global tropospheric background levels. The significantly elevated mixing ratios of ozone depleting substances (ODSs) combined with strong correlations with anthropogenic tracers known to have substantial use and emission in this region (HCFC-22 and CH2Cl2) suggest continuing emissions of multiple Montreal Protocol-controlled gases at the time of measurement. We use HYSPLIT trajectory clusters and potential source contribution function methods to identify principal transport pathways of CFCs. We find the highest mixing ratios of ODSs in air originating from Inner Mongolia, Hebei, and Shandong. The strong correlations between CFC-11 and CFC-12 with the feedstock CCl4 suggest new production is prevalent in all three regions. We find no evidence for new production of CFC-113, but the strong correlation of CFC-114 with the feedstock C2Cl4 suggests new production of CFC-114 from the southeast of China. The findings of this study confirm high mixing ratios of ODSs over Hebei in Spring 2016 and suggest new production and use (rather than release from banks), which is in conflict with the Montreal Protocol agreement that bans the production of CFCs. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	aircraft; CFC-11; CFC-12; CFCs; Hebei; production
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/237002
作者单位	Department of Atmospheric and Oceanic Science, University of Maryland, College Park, MD, United States; Now at Oak Ridge Institute for Science and Education (ORISE), U.S. Environmental Protection Agency, Research Triangle Park, NC, United States; Department of Chemistry and Biochemistry, University of Maryland, College Park, MD, United States; Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, United States; Air Resources Laboratory, National Oceanic and Atmospheric Administration, College Park, MD, United States
推荐引用方式 GB/T 7714	Benish S.E.,Salawitch R.J.,Ren X.,et al. Airborne Observations of CFCs Over Hebei Province, China in Spring 2016[J],2021,126(18).
APA	Benish S.E.,Salawitch R.J.,Ren X.,He H.,&Dickerson R.R..(2021).Airborne Observations of CFCs Over Hebei Province, China in Spring 2016.Journal of Geophysical Research: Atmospheres,126(18).
MLA	Benish S.E.,et al."Airborne Observations of CFCs Over Hebei Province, China in Spring 2016".Journal of Geophysical Research: Atmospheres 126.18(2021).