气候变化领域集成服务门户(CCPortal): Impact of weather patterns and meteorological factors on PM2.5 and O3 responses to the COVID-19 lockdown in China

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DOI	10.5194/acp-24-6539-2024
	Impact of weather patterns and meteorological factors on PM2.5 and O3 responses to the COVID-19 lockdown in China
	Shen, Fuzhen; Hegglin, Michaela I.; Yuan, Yue
发表日期	2024
ISSN	1680-7316
EISSN	1680-7324
起始页码	24
结束页码	11
卷号	24 期号:11
英文摘要	Haze events in the North China Plain (NCP) and a decline in ozone levels in Southern Coast China (SC) from 21 January to 9 February 2020 during the COVID-19 lockdown have attracted public curiosity and scholarly attention. Most previous studies focused on the impact of atmospheric chemistry processes associated with anomalous weather elements in these cases, but fewer studies quantified the impact of various weather elements within the context of a specific weather pattern. To identify the weather patterns responsible for inducing this unexpected situation and to further quantify the importance of different meteorological factors during the haze event, two approaches are employed. These approaches implemented the comparisons of observations in 2020 with climatology averaged over the years 2015-2019 with a novel structural SOM (self-organising map) model and with the prediction of the business as usual (hereafter referred to as BAU) emission strength by the GBM (gradient-boosting machine) model, respectively. The results reveal that the unexpected PM2.5 pollution and O-3 decline from the climatology in NCP and SC could be effectively explained by the presence of a double-centre high-pressure system across China. Moreover, the GBM results provided a quantitative assessment of the importance of each meteorological factor in driving the predictions of PM2.5 and O-3 under the specific weather system. These results indicate that temperature played the most crucial role in the haze event in NCP, as well as in the O-3 change in SC. This valuable information will ultimately contribute to our ability to predict air pollution under future emission scenarios and changing weather patterns that may be influenced by climate change.
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:001239202700001
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/300149
作者单位	Helmholtz Association; Research Center Julich; University of Reading
推荐引用方式 GB/T 7714	Shen, Fuzhen,Hegglin, Michaela I.,Yuan, Yue. Impact of weather patterns and meteorological factors on PM2.5 and O3 responses to the COVID-19 lockdown in China[J],2024,24(11).
APA	Shen, Fuzhen,Hegglin, Michaela I.,&Yuan, Yue.(2024).Impact of weather patterns and meteorological factors on PM2.5 and O3 responses to the COVID-19 lockdown in China.ATMOSPHERIC CHEMISTRY AND PHYSICS,24(11).
MLA	Shen, Fuzhen,et al."Impact of weather patterns and meteorological factors on PM2.5 and O3 responses to the COVID-19 lockdown in China".ATMOSPHERIC CHEMISTRY AND PHYSICS 24.11(2024).