气候变化领域集成服务门户(CCPortal): Evident PM2.5 drops in the east of China due to the COVID-19 quarantine measures in February

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DOI	10.5194/acp-21-1581-2021
	Evident PM2.5 drops in the east of China due to the COVID-19 quarantine measures in February
	Yin Z.; Zhang Y.; Wang H.; Li Y.
发表日期	2021
ISSN	1680-7316
起始页码	1581
结束页码	1592
卷号	21 期号:3
英文摘要	The top-level emergency response to the COVID-19 pandemic involved exhaustive quarantine measures in China. The impacts of the COVID-19 quarantine on the decline in fine particulate matter (PM2:5) were quantitatively assessed based on numerical simulations and observations in February. Relative to both February 2017 and the climate mean, anomalous southerlies and moister air occurred in the east of China in February 2020, which caused considerable PM2:5 anomalies. Thus, it is a must to disentangle the contributions of stable meteorology from the effects of the COVID-19 lockdown. The contributions of routine emission reductions were also quantitatively extrapolated. The toplevel emergency response substantially alleviated the level of haze pollution in the east of China. Although climate variability elevated the PM2:5 by 29% (relative to 2020 observations), a 59%decline related to the COVID-19 pandemic and a 20% decline from the expected pollution regulation dramatically exceeded the former in North China. The COVID-19 quarantine measures decreased the PM2:5 in the Yangtze River Delta by 72 %. In Hubei Province where most pneumonia cases were confirmed, the impact of total emission reduction (72 %) evidently exceeded the rising percentage of PM2:5 driven by meteorology (13 %). © 2021 Institute of Electrical and Electronics Engineers Inc.. All rights reserved.
语种	英语
scopus关键词	atmospheric moisture; computer simulation; COVID-19; haze; numerical model; particulate matter; quantitative analysis; China
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/247178
作者单位	Key Laboratory of Meteorological Disaster, Min. of Educ./Jt. Intl. Res. Lab. of Climate and Environ. Change /Collab. Innov. Ctr. on Forecast and Eval. of Meteorol. Disasters, Nanjing University of Information Science and Technology, Nanjing, 210044, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519080, China; Nansen-Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China
推荐引用方式 GB/T 7714	Yin Z.,Zhang Y.,Wang H.,et al. Evident PM2.5 drops in the east of China due to the COVID-19 quarantine measures in February[J],2021,21(3).
APA	Yin Z.,Zhang Y.,Wang H.,&Li Y..(2021).Evident PM2.5 drops in the east of China due to the COVID-19 quarantine measures in February.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(3).
MLA	Yin Z.,et al."Evident PM2.5 drops in the east of China due to the COVID-19 quarantine measures in February".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.3(2021).