Summertime ozone pollution in Sichuan Basin, China: Meteorological conditions, sources and process analysis

doi:10.1016/j.atmosenv.2020.117392

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地表生过程与生态调控重点实验室

	Summertime ozone pollution in Sichuan Basin, China: Meteorological conditions, sources and process analysis
	Yang, Xianyu 1; Wu, Kai 1,8; Wang, Haolin 7; Liu, Yiming 6; Gu, Shan 5; Lu, Yaqiong 4; Zhang, Xiaoling 1; Hu, Yishi 3; Ou, Yihan 1; Wang, Shigong 1
刊名	Atmospheric Environment
	2020
卷号	226 页码:117392
关键词	Community multi scale air qualities Formation and evolutions Meteorological condition Ozone pollution Positive Matrix Factorization Regional transport Sichuan Basin Weather research and forecasting
ISSN号	1352-2310
DOI	10.1016/j.atmosenv.2020.117392
产权排序	6
文献子类	Article
英文摘要	The Sichuan Basin (SCB) has suffered from serious ozone (O3) pollution in recent years, especially in summer. However, the formation and evolution mechanisms of O3 pollution in the SCB remain poorly understood. In this paper, we comprehensively investigated the causes of elevated ozone concentrations in Chengdu in July 2017 with a combination of field measurements and the WRF (Weather Research and Forecasting)-CMAQ (Community Multi-scale Air Quality) model simulations. The ozone formation characteristics of continuous O3 episodes and non-O3 episodes were compared. Higher temperature (T), stronger solar radiation (SR), lower relative humidity (RH) and weaker winds were conducive to O3 formation during ozone episodes. The O3 concentration during O3 episodes (202.6 μg m−3) was significantly higher than that during non-O3 episodes (122.7 μg m−3), attributable to the higher volatile organic compounds (VOCs) concentration (34.0 ppbv compared with 27.5 ppbv) despite comparable NOx concentrations during O3 episodes. The results of positive matrix factorization (PMF) for ambient VOCs showed that gasoline vehicle exhaust and solvent usage were the dominant sources during the month. However, the increasing source attributions from the petrochemical industry and biogenic emissions were responsible for the elevated VOCs concentrations during O3 episodes. The relative contributions of local emission and regional transport to ozone were quantified during two O3 episodes by conducting numerical sensitivity experiments. In the first episode, namely, the "O3-regionally transported" pattern, high ozone concentration in Chengdu was primarily due to the regional transport of ozone and ozone precursors through vertical mixing and horizontal advection from upwind areas (central and eastern SCB) when easterly or southeasterly winds prevailed over the SCB. In contrast, in the second episode, namely, the "O3-locally dominated" pattern, high local emissions under favorable meteorological conditions are the major reason for elevated ozone concentration. The process analysis results from the CMAQ model suggested that the vertical transport of O3 that formed at the upper levels from intense gas-phase chemistry reactions was a dominant contributor to diurnal O3 enhancement in O3 episodes by 45 μg m−3, while horizontal transport contributed more than 80% of the nocturnal O3 concentration. This study provides a better understanding of ozone photochemical formation and regional transport mechanisms in the SCB under complex terrain conditions, and contributes to ozone pollution prevention in other basins around the world. © 2020 Elsevier Ltd
电子版国际标准刊号	1873-2844
语种	英语
WOS记录号	WOS:000525867000008
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/34148]
专题	成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室
通讯作者	Liu, Yiming; Wang, Zhanshan
作者单位	1.Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu, China; 2.State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, China 3.Department of Atmospheric Science, University of Wyoming, Laramie;WY, United States; 4.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, China; 5.Department of Ecology and Evolutionary Biology, University of California, Irvine;CA, United States; 6.Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong; 7.School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai;Guangdong, China; 8.Department of Land, Air, and Water Resources, University of California, Davis, CA, United States;
推荐引用方式 GB/T 7714	Yang, Xianyu,Wu, Kai,Wang, Haolin,et al. Summertime ozone pollution in Sichuan Basin, China: Meteorological conditions, sources and process analysis[J]. Atmospheric Environment,2020,226:117392.
APA	Yang, Xianyu.,Wu, Kai.,Wang, Haolin.,Liu, Yiming.,Gu, Shan.,...&Wang, Zhanshan.(2020).Summertime ozone pollution in Sichuan Basin, China: Meteorological conditions, sources and process analysis.Atmospheric Environment,226,117392.
MLA	Yang, Xianyu,et al."Summertime ozone pollution in Sichuan Basin, China: Meteorological conditions, sources and process analysis".Atmospheric Environment 226(2020):117392.