气候变化领域集成服务门户(CCPortal): A comparative study to reveal the influence of typhoons on the transport, production and accumulation of O3 in the Pearl River Delta, China

CCPortal

DOI	10.5194/acp-21-11593-2021
	A comparative study to reveal the influence of typhoons on the transport, production and accumulation of O3 in the Pearl River Delta, China
	Qu K.; Wang X.; Yan Y.; Shen J.; Xiao T.; Dong H.; Zeng L.; Zhang Y.
发表日期	2021
ISSN	1680-7316
起始页码	11593
结束页码	11612
卷号	21 期号:15
英文摘要	The Pearl River Delta (PRD) region in South China is faced with severe ambient tropospheric ozone (O3) pollution in autumn and summer, which mostly coincides with the occurrence of typhoons above the Northwest Pacific. With increasingly severe O3 pollution in the PRD under the influence of typhoons, it is necessary to gain a comprehensive understanding of the impact of typhoons on O3 transport, production and accumulation for efficient O3 reduction. In this study, we analysed the general influence of typhoons on O3 pollution in the PRD via systematic comparisons of meteorological conditions, O3 processes and sources on O3 pollution days with and without typhoon occurrence (denoted as the typhoon-induced and no-typhoon scenarios, respectively) and also examined the differences in these influences in autumn and summer. The results show that the approach of typhoons was accompanied by higher wind speeds and strengthened downdraughts in autumn, as well as the inflows of more polluted air masses in summer, suggesting favourable O3 transport conditions in the typhoon-induced scenario in both seasons. However, the effect of typhoons on the production and accumulation of O3 were distinct. Typhoons led to reduced cloud cover, and thus stronger solar radiation in autumn, which accelerated O3 production, but the shorter residence time of local air masses was unfavourable for the accumulation of O3 within the PRD. In contrast, in summer, typhoons increased cloud cover, and weakened solar radiation, thus restraining O3 formation, but the growing residence time of local air masses favoured O3 accumulation. The modelling results using the Community Multiscale Air Quality (CMAQ) model for the typical O3 pollution days suggest increasing contributions from the transport processes and sources outside the PRD for O3 pollution, confirming enhanced O3 transport under typhoon influence in both seasons. The results of the process analysis in CMAQ suggest that the chemical process contributed more in autumn but less in summer in the PRD. Since O3 production and accumulation cannot be enhanced at the same time, the proportion of O3 contributed by emissions within the PRD was likely to decrease in both seasons. The difference in the typhoon influence on O3 processes in autumn and summer can be attributed to the seasonal variation of the East Asian monsoon. From the meteorology-process-source perspective, this study revealed the complex influence of typhoons on O3 pollution in the PRD and their seasonal differences. To alleviate O3 pollution under typhoon influence, emission control is needed on a larger scale, rather than only within the PRD. © Copyright:
语种	英语
scopus关键词	air mass; atmospheric pollution; cloud cover; comparative study; ozone; pollutant transport; seasonal variation; solar radiation; troposphere; typhoon; wind velocity; China; Guangdong; Zhujiang Delta
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/246685
作者单位	State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China; International Joint Laboratory for Regional Pollution Control, Ministry of Education, Beijing, 100816, China; State Key Laboratory of Regional Air Quality Monitoring, Guangdong Key Laboratory of Secondary Air Pollution Research, Guangdong Environmental Monitoring Center, Guangzhou, 510308, China; Beijing Innovation Center for Engineering Science and Advanced Technology, Peking University, Beijing, 100871, China; CAS Center for Excellence in Regional Atmospheric Environment, Chinese Academy of Sciences, Xiamen, 361021, China
推荐引用方式 GB/T 7714	Qu K.,Wang X.,Yan Y.,et al. A comparative study to reveal the influence of typhoons on the transport, production and accumulation of O3 in the Pearl River Delta, China[J],2021,21(15).
APA	Qu K..,Wang X..,Yan Y..,Shen J..,Xiao T..,...&Zhang Y..(2021).A comparative study to reveal the influence of typhoons on the transport, production and accumulation of O3 in the Pearl River Delta, China.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(15).
MLA	Qu K.,et al."A comparative study to reveal the influence of typhoons on the transport, production and accumulation of O3 in the Pearl River Delta, China".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.15(2021).