气候变化领域集成服务门户(CCPortal): Direct detection of atmospheric atomic bromine leading to mercury and ozone depletion

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DOI	10.1073/pnas.1900613116
	Direct detection of atmospheric atomic bromine leading to mercury and ozone depletion
	Wang S.; McNamara S.M.; Moore C.W.; Obrist D.; Steffen A.; Shepson P.B.; Staebler R.M.; Raso A.R.W.; Pratt K.A.
发表日期	2019
ISSN	0027-8424
起始页码	14479
结束页码	14484
卷号	116 期号:29
英文摘要	Bromine atoms play a central role in atmospheric reactive halogen chemistry, depleting ozone and elemental mercury, thereby enhancing deposition of toxic mercury, particularly in the Arctic near-surface troposphere. However, direct bromine atom measurements have been missing to date, due to the lack of analytical capability with sufficient sensitivity for ambient measurements. Here we present direct atmospheric bromine atom measurements, conducted in the springtime Arctic. Measured bromine atom levels reached 14 parts per trillion (ppt, pmol mol−1; 4.2 × 108 atoms per cm−3) and were up to 3–10 times higher than estimates using previous indirect measurements not considering the critical role of molecular bromine. Observed ozone and elemental mercury depletion rates are quantitatively explained by the measured bromine atoms, providing field validation of highly uncertain mercury chemistry. Following complete ozone depletion, elevated bromine concentrations are sustained by photochemical snowpack emissions of molecular bromine and nitrogen oxides, resulting in continued atmospheric mercury depletion. This study provides a breakthrough in quantitatively constraining bromine chemistry in the polar atmosphere, where this chemistry connects the rapidly changing surface to pollutant fate. © 2019 National Academy of Sciences. All rights reserved.
英文关键词	Atmosphere; Bromine; Mercury; Ozone
语种	英语
scopus关键词	bromine; mercury; Article; chemical analysis; chemical modification; chemical reaction kinetics; concentration (parameter); ozone depletion; physical chemistry; physical parameters; priority journal; quantitative analysis; sensitivity analysis
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160396
作者单位	Wang, S., Department of Chemistry, University of Michigan, Ann Arbor, MI 48109, United States; McNamara, S.M., Department of Chemistry, University of Michigan, Ann Arbor, MI 48109, United States; Moore, C.W., Division of Atmospheric Science, Desert Research Institute, Reno, NV 89523, United States, Gas Technology Institute, Des Plaines, IL 60018, United States; Obrist, D., Division of Atmospheric Science, Desert Research Institute, Reno, NV 89523, United States, Department of Environmental, Earth and Atmospheric Sciences, University of Massachusetts, Lowell, MA 01854, United States; Steffen, A., Air Quality Processes Research Section, Environment and Climate Change Canada, Toronto, ON M3H5T4, Canada; Shepson, P.B., Department of Chemistry, Purdue University, West Lafayette, IN 47907, United States, Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN 47907, United States, Purdue Climate Change Research Center, Purdue University, West Lafayette, IN 47907...
推荐引用方式 GB/T 7714	Wang S.,McNamara S.M.,Moore C.W.,et al. Direct detection of atmospheric atomic bromine leading to mercury and ozone depletion[J],2019,116(29).
APA	Wang S..,McNamara S.M..,Moore C.W..,Obrist D..,Steffen A..,...&Pratt K.A..(2019).Direct detection of atmospheric atomic bromine leading to mercury and ozone depletion.Proceedings of the National Academy of Sciences of the United States of America,116(29).
MLA	Wang S.,et al."Direct detection of atmospheric atomic bromine leading to mercury and ozone depletion".Proceedings of the National Academy of Sciences of the United States of America 116.29(2019).