气候变化领域集成服务门户(CCPortal): Winter ClNO2formation in the region of fresh anthropogenic emissions: Seasonal variability and insights into daytime peaks in northern China

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DOI	10.5194/acp-21-15985-2021
	Winter ClNO2formation in the region of fresh anthropogenic emissions: Seasonal variability and insights into daytime peaks in northern China
	Xia M.; Peng X.; Wang W.; Yu C.; Wang Z.; Tham Y.J.; Chen J.; Chen H.; Mu Y.; Zhang C.; Liu P.; Xue L.; Wang X.; Gao J.; Li H.; Wang T.
发表日期	2021
ISSN	1680-7316
起始页码	15985
结束页码	16000
卷号	21 期号:20
英文摘要	Nitryl chloride (ClNO2) is an important chlorine reservoir in the atmosphere that affects the oxidation of volatile organic compounds (VOCs) and the production of ROx radicals and ozone (O3). This study presents measurements of ClNO2 and related compounds at urban, polluted rural, and polluted lower tropospheric (mountaintop) sites in the winter of 2017-2018 over the North China Plain (NCP). The nocturnal concentrations of ClNO2 were lower at the urban and polluted rural sites but higher at the polluted lower tropospheric site. The winter concentrations of ClNO2 were generally lower than the summer concentrations that were previously observed at these sites, which was due to the lower nitrate radical (NO3) production rate (P(NO3)) and the smaller N2O5 uptake coefficients (γ(N2O5)) in winter, despite the higher ratios of dinitrogen pentoxide (N2O5) to NO3 in winter. Significant daytime peaks of ClNO2 were observed at all the sites during the winter campaigns, with ClNO2 mixing ratios of up to 1.3ppbv. Vertical transport of ClNO2 from the residual layers and prolonged photochemical lifetime of ClNO2 in winter may explain the elevated daytime concentrations. The daytime-averaged chlorine radical (Cl) production rates (P(Cl)) from the daytime ClNO2 were 0.17, 0.11, and 0.12ppbvh-1 at the polluted rural, urban, and polluted lower tropospheric sites, respectively, which were approximately 3-4 times higher than the campaign-averaged conditions. Box model calculations showed that the Cl atoms liberated during the daytime peaks of ClNO2 increased the ROx levels by up to 27%-37% and increased the daily O3 productions by up to 13%-18%. Our results provide new insights into the ClNO2 processes in the lower troposphere impacted by fresh and intense anthropogenic emissions and reveal that ClNO2 can be an important daytime source of Cl radicals under certain conditions in winter. © Author(s) 2021.
语种	英语
scopus关键词	anthropogenic source; atmospheric chemistry; chlorine; seasonal variation; source apportionment; volatile organic compound; China
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/246472
作者单位	Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong; Environment Research Institute, Shandong University, Shandong, Ji'nan, China; Chinese Research Academy of Environmental Sciences, Beijing, China; Department of Environmental Science and Engineering, Institute of Atmospheric Sciences, Fudan University, Shanghai, China; Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China; Division of Environment and Sustainability, Hong Kong University of Science and Technology, Hong Kong; Institute for Atmospheric and Earth System Research/Physics, University of Helsinki, Helsinki, Finland; Hangzhou PuYu Technology Development Co., Ltd, Zhejiang, Hangzhou, China
推荐引用方式 GB/T 7714	Xia M.,Peng X.,Wang W.,et al. Winter ClNO2formation in the region of fresh anthropogenic emissions: Seasonal variability and insights into daytime peaks in northern China[J],2021,21(20).
APA	Xia M..,Peng X..,Wang W..,Yu C..,Wang Z..,...&Wang T..(2021).Winter ClNO2formation in the region of fresh anthropogenic emissions: Seasonal variability and insights into daytime peaks in northern China.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(20).
MLA	Xia M.,et al."Winter ClNO2formation in the region of fresh anthropogenic emissions: Seasonal variability and insights into daytime peaks in northern China".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.20(2021).