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DOI	10.5194/acp-22-10751-2022
	Impact of a subtropical high and a typhoon on a severe ozone pollution episode in the Pearl River Delta, China
	Ouyang, Shanshan; Deng, Tao; Liu, Run; Chen, Jingyang; He, Guowen; Leung, Jeremy Cheuk-Hin; Wang, Nan; Liu, Shaw Chen
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	10751
结束页码	10767
卷号	22 期号:16 页码:17
英文摘要	A record-breaking severe ozone (O-3) pollution episode occurred in the Pearl River Delta (PRD) in early autumn 2019 when the PRD was under the influence of a Pacific subtropical high followed by Typhoon Mitag. In this study, we analyzed the effects of meteorological and photochemical processes on the O-3 concentration in the PRD during this episode by carrying out the Weather Research Forecast-Community Multiscale Air Quality (WRF-CMAQ) model simulations. Results showed that low relative humidity, high boundary layer height, weak northerly surface wind, and strong downdrafts were the main meteorological factors contributing to O-3 pollution. Moreover, delayed sea breezes that lasted into the night would transport O-3 from the sea back to the land and resulted in secondary O-3 maxima at night. In addition, O-3 and its precursors stored in the residual layer above the surface layer at night can be mixed down to the surface in the next morning, further enhancing the daytime ground-level O-3 concentration on the following day. Photochemical production of O-3, with a daytime average production rate of about 7.2 ppb h(-1) (parts per billion), is found to be the predominate positive contributor to the O-3 budget of the boundary layer (0-1260 m) during the entire O-3 episode, while the horizontal and vertical transport fluxes are the dominant negative contributors. This O-3 episode accounted for 10 out of the yearly total of 51 d when the maximum daily 8 h average (MDA8) O-3 concentration exceeded the national standard of 75 ppb in the PRD in 2019. Based on these results, we propose that the enhanced photochemical production of O-3 during the episode is a major cause of the most severe O-3 pollution year since the official O-3 observation started in the PRD in 2006. Moreover, since this O-3 episode is a synoptic-scale phenomenon covering the entire eastern China, we also suggest that the enhanced photochemical production of O-3 in this O-3 episode is a major cause of the extraordinarily high O-3 concentrations observed in eastern China in 2019.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000844112600001
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/273174
作者单位	Jinan University; China Meteorological Administration; Sun Yat Sen University
推荐引用方式 GB/T 7714	Ouyang, Shanshan,Deng, Tao,Liu, Run,et al. Impact of a subtropical high and a typhoon on a severe ozone pollution episode in the Pearl River Delta, China[J],2022,22(16):17.
APA	Ouyang, Shanshan.,Deng, Tao.,Liu, Run.,Chen, Jingyang.,He, Guowen.,...&Liu, Shaw Chen.(2022).Impact of a subtropical high and a typhoon on a severe ozone pollution episode in the Pearl River Delta, China.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(16),17.
MLA	Ouyang, Shanshan,et al."Impact of a subtropical high and a typhoon on a severe ozone pollution episode in the Pearl River Delta, China".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.16(2022):17.