气候变化领域集成服务门户(CCPortal): Inter-annual variations of wet deposition in Beijing from 2014-2017: Implications of below-cloud scavenging of inorganic aerosols

CCPortal

DOI	10.5194/acp-21-9441-2021
	Inter-annual variations of wet deposition in Beijing from 2014-2017: Implications of below-cloud scavenging of inorganic aerosols
	Ge B.; Xu D.; Wild O.; Yao X.; Wang J.; Chen X.; Tan Q.; Pan X.; Wang Z.
发表日期	2021
ISSN	1680-7316
起始页码	9441
结束页码	9454
卷号	21 期号:12
英文摘要	Wet scavenging is an efficient pathway for the removal of particulate matter (PM) from the atmosphere. High levels of PM have been a major cause of air pollution in Beijing but have decreased sharply under the Air Pollution Prevention and Control Action Plan launched in 2013. In this study, 4 years of observations of wet deposition have been conducted using a sequential sampling technique to investigate the detailed variation in chemical components through each rainfall event. We find that the major ions, SO42-, Ca2+, NO3-, and NH4+, show significant decreases over the 2013-2017 period (decreasing by 39g%, 35g%, 12g%, and 25g%, respectively), revealing the impacts of the Action Plan. An improved method of estimating the below-cloud scavenging proportion based on sequential sampling is developed and implemented to estimate the contribution of below-cloud and in-cloud wet deposition over the four-year period. Overall, below-cloud scavenging plays a dominant role to the wet deposition of four major ions at the beginning of the Action Plan. The contribution of below-cloud scavenging for Ca2+, SO42-, and NH4+ decreases from above 50g% in 2014 to below 40g% in 2017. This suggests that the Action Plan has mitigated PM pollution in the surface layer and hence decreased scavenging due to the washout process. In contrast, we find little change in the annual volume weighted average concentration for NO3- where the contribution from below-cloud scavenging remains at g1/4g44g% over the 2015-2017 period. While highlighting the importance of different wet scavenging processes, this paper presents a unique new perspective on the effects of the Action Plan and clearly identifies oxidized nitrogen species as a major target for future air pollution controls. © Copyright:
语种	英语
scopus关键词	action plan; aerosol; annual variation; atmospheric pollution; cloud; concentration (composition); nitrate; particulate matter; wet deposition; Beijing [China]; 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/246790
作者单位	State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences (CAS), Beijing, 100029, China; Lancaster Environment Centre, Lancaster University, Lancaster, LA1 4YQ, United Kingdom; PLA 96941 Army, Beijing, 102206, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; National Center for Climate Change Strategy and International Cooperation, Ministry of Ecology and Environment, Beijing, 100035, China
推荐引用方式 GB/T 7714	Ge B.,Xu D.,Wild O.,et al. Inter-annual variations of wet deposition in Beijing from 2014-2017: Implications of below-cloud scavenging of inorganic aerosols[J],2021,21(12).
APA	Ge B..,Xu D..,Wild O..,Yao X..,Wang J..,...&Wang Z..(2021).Inter-annual variations of wet deposition in Beijing from 2014-2017: Implications of below-cloud scavenging of inorganic aerosols.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(12).
MLA	Ge B.,et al."Inter-annual variations of wet deposition in Beijing from 2014-2017: Implications of below-cloud scavenging of inorganic aerosols".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.12(2021).