The drivers and health risks of unexpected surface ozone enhancements over the Sichuan Basin, China, in 2020

doi:10.5194/acp-21-18589-2021

	The drivers and health risks of unexpected surface ozone enhancements over the Sichuan Basin, China, in 2020
	Sun, Youwen 5,6; Yin, Hao 5,6; Lu, Xiao 3; Notholt, Justus 4; Palm, Mathias 4; Liu, Cheng 5; Tian, Yuan 2; Zheng, Bo 1
刊名	ATMOSPHERIC CHEMISTRY AND PHYSICS
	2021-12-22
卷号	21
ISSN号	1680-7316
DOI	10.5194/acp-21-18589-2021
通讯作者	Yin, Hao(yhyh95@mail.ustc.edu.cn) ; Lu, Xiao(luxiao25@mail.sysu.edu.cn)
英文摘要	Following a continuous increase in the surface ozone (O-3) level from 2013 to 2019, the overall summertime O-3 concentrations across China showed a significant reduction in 2020. In contrast to this overall reduction in surface O3 across China, unexpected surface O-3 enhancements of 10.2 +/- 0.8 ppbv (23.4 %) were observed in May-June 2020 (relative to 2019) over the Sichuan Basin (SCB), China. In this study, we use high-resolution nested-grid GEOS-Chem simulation, the eXtreme Gradient Boosting (XGBoost) machine learning method, and the exposure-response relationship to determine the drivers and evaluate the health risks due to the unexpected surface O-3 enhancements. We first use the XGBoost machine learning method to correct the GEOS-Chem model-measurement O-3 discrepancy over the SCB. The relative contributions of meteorology and anthropogenic emission changes to the unexpected surface O-3 enhancements are then quantified with a combination of GEOS-Chem and XGBoost models. In order to assess the health risks caused by the unexpected O-3 enhancements over the SCB, total premature mortalities are estimated. The results show that changes in anthropogenic emissions caused a 0.9 +/- 0.1 ppbv O-3 reduction, whereas changes in meteorology caused an 11.1 +/- 0.7 ppbv O-3 increase in May-June 2020 relative to 2019. The meteorology-induced surface O-3 increase is mainly attributed to an increase in temperature and decreases in precipitation, specific humidity, and cloud fractions over the SCB and surrounding regions in May-June 2020 relative to 2019. These changes in meteorology combined with the complex basin effect enhance biogenic emissions of volatile organic compounds (VOCs) and nitrogen oxides (NOx), speed up O-3 chemical production, and inhibit the ventilation of O-3 and its precursors; therefore, they account for the surface O-3 enhancements over the SCB. The total premature mortality due to the unexpected surface O-3 enhancements over the SCB has increased by 89.8 % in May-June 2020 relative to 2019.
资助项目	National Key Research and Development Program of China[2019YFC0214802] ; Youth Innovation Promotion Association of the Chinese Academy of Sciences[2019434] ; Sino-German Mobility programme[M-0036]
WOS关键词	STRATOSPHERE-TROPOSPHERE EXCHANGE ; ANTHROPOGENIC EMISSION INVENTORY ; GROUND-LEVEL OZONE ; EASTERN CHINA ; GLOBAL BURDEN ; AIR-QUALITY ; DRY DEPOSITION ; MODEL ; POLLUTION ; TRANSPORT
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
语种	英语
出版者	COPERNICUS GESELLSCHAFT MBH
WOS记录号	WOS:000733104800001
资助机构	National Key Research and Development Program of China ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Sino-German Mobility programme
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/126982]
专题	中国科学院合肥物质科学研究院
通讯作者	Yin, Hao; Lu, Xiao
作者单位	1.Tsinghua Univ, Tsinghua Shenzhen Int Grad Sch, Inst Environm & Ecol, Shenzhen 518055, Peoples R China 2.Anhui Univ, Inst Phys Sci & Informat Technol, Hefei 230601, Peoples R China 3.Sun Yat Sen Univ, Sch Atmospher Sci, Zhuhai 519082, Peoples R China 4.Univ Bremen, Inst Environm Phys, D-28334 Bremen, Germany 5.Univ Sci & Technol China, Key Lab Precis Sci Instrumentat Anhui Higher Educ, Hefei 230026, Peoples R China 6.Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Environm Opt & Technol, HFIPS, Hefei 230031, Peoples R China
推荐引用方式 GB/T 7714	Sun, Youwen,Yin, Hao,Lu, Xiao,et al. The drivers and health risks of unexpected surface ozone enhancements over the Sichuan Basin, China, in 2020[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2021,21.
APA	Sun, Youwen.,Yin, Hao.,Lu, Xiao.,Notholt, Justus.,Palm, Mathias.,...&Zheng, Bo.(2021).The drivers and health risks of unexpected surface ozone enhancements over the Sichuan Basin, China, in 2020.ATMOSPHERIC CHEMISTRY AND PHYSICS,21.
MLA	Sun, Youwen,et al."The drivers and health risks of unexpected surface ozone enhancements over the Sichuan Basin, China, in 2020".ATMOSPHERIC CHEMISTRY AND PHYSICS 21(2021).