气候变化领域集成服务门户(CCPortal): Study on the variation of air pollutant concentration and its formation mechanism during the COVID-19 period in Wuhan

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DOI	10.1016/j.atmosenv.2021.118276
	Study on the variation of air pollutant concentration and its formation mechanism during the COVID-19 period in Wuhan
	Huang C.; Wang T.; Niu T.; Li M.; Liu H.; Ma C.
发表日期	2021
ISSN	1352-2310
卷号	251
英文摘要	To prevent the spread of COVID-19 (2019 novel coronavirus), from January 23 to April 8 in 2020, the highest Class 1 Response was ordered in Wuhan, requiring all residents to stay at home unless absolutely necessary. This action was implemented to cut down all unnecessary human activities, including industry, agriculture and transportation. Reducing these activities to a very low level during these hard times meant that some unprecedented naturally occurring measures of controlling emissions were executed. Ironically, however, after these measures were implemented, ozone levels increased by 43.9%. Also worthy of note, PM2.5 decreased 31.7%, which was found by comparing the observation data in Wuhan during the epidemic from 8th Feb. to 8th Apr. in 2020 with the same periods in 2019. Utilizing CMAQ (The Community Multiscale Air Quality modeling system), this article investigated the reason for these phenomena based on four sets of numerical simulations with different schemes of emission reduction. Comparing the four sets of simulations with observation, it was deduced that the emissions should decrease to approximately 20% from the typical industrial output, and 10% from agriculture and transportation sources, attributed to the COVID-19 lockdown in Wuhan. More importantly, through the CMAQ process analysis, this study quantitatively analyzed differences of the physical and chemical processes that were affected by the COVID-19 lockdown. It then examined the differences of the COVID-19 lockdown impact and determined the physical and chemical processes between when the pollution increased and decreased, determining the most affected period of the day. As a result, this paper found that (1) PM2.5 decreased mainly due to the reduction of emission and the contrary contribution of aerosol processes. The North-East wind was also in favor of the decreasing of PM2.5. (2) O3 increased mainly due to the slowing down of chemical consumption processes, which made the concentration change of O3 pollution higher at about 4 p.m.–7 p.m. of the day, while increasing the concentration of O3 at night during the COVID-19 lockdown in Wuhan. The higher O3 concentration in the North-East of the main urban area also contributed to the increasing of O3 with unfavorable wind direction. © 2021 Elsevier Ltd
关键词	CMAQ COVID-19 PM2.5 and O3 Process analysis Unexpected air pollution
语种	英语
scopus关键词	Agricultural robots; Agriculture; Air quality; Emission control; Air pollutant concentrations; Chemical consumption; Community multi-scale air quality models; Concentration change; Emission reduction; Formation mechanism; Naturally occurring; Reduction of emissions; Chemical analysis; ozone; aerosol; atmospheric pollution; concentration (composition); COVID-19; emission control; epidemic; formation mechanism; ozone; wind direction; aerosol; agriculture; air pollutant; air pollution; air pollution control; air quality; Article; budget; chemical phenomena; China; community multiscale air quality modeling system; comparative study; coronavirus disease 2019; day length; environmental impact; industrial area; lockdown; meteorological phenomena; night; nonbiological model; observational study; particulate matter 2.5; physical phenomena; priority journal; quantitative analysis; simulation; toxic concentration; traffic and transport; urban area; wind; China; Hubei; Wuhan; Coronavirus
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248531
作者单位	School of Atmospheric Sciences, Nanjing University, Nanjing, 210023, China; State Key Laboratory of Severe Weather and Key Laboratory of Atmospheric Chemistry of CMA, Chinese Academy of Meteorological Sciences, Beijing, 100081, China
推荐引用方式 GB/T 7714	Huang C.,Wang T.,Niu T.,et al. Study on the variation of air pollutant concentration and its formation mechanism during the COVID-19 period in Wuhan[J],2021,251.
APA	Huang C.,Wang T.,Niu T.,Li M.,Liu H.,&Ma C..(2021).Study on the variation of air pollutant concentration and its formation mechanism during the COVID-19 period in Wuhan.ATMOSPHERIC ENVIRONMENT,251.
MLA	Huang C.,et al."Study on the variation of air pollutant concentration and its formation mechanism during the COVID-19 period in Wuhan".ATMOSPHERIC ENVIRONMENT 251(2021).