气候变化领域集成服务门户(CCPortal): An improved decomposition method to differentiate meteorological and anthropogenic effects on air pollution: A national study in China during the COVID-19 lockdown period

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DOI	10.1016/j.atmosenv.2021.118270
	An improved decomposition method to differentiate meteorological and anthropogenic effects on air pollution: A national study in China during the COVID-19 lockdown period
	Song Y.; Lin C.; Li Y.; Lau A.K.H.; Fung J.C.H.; Lu X.; Guo C.; Ma J.; Lao X.Q.
发表日期	2021
ISSN	1352-2310
卷号	250
英文摘要	Although the effects of meteorological factors on severe air pollution have been extensively investigated, quantitative decomposition of the contributions of meteorology and anthropogenic factors remains a big challenge. The novel coronavirus disease 2019 (COVID-19) pandemic affords a unique opportunity to test decomposition method. Based on a wind decomposition method, this study outlined an improved method to differentiate complex meteorological and anthropogenic effects. The improved method was then applied to investigate the cause of unanticipated haze pollution in China during the COVID-19 lockdown period. Results from the wind decomposition method show that weakened winds increased PM2.5 concentrations in the Beijing–Tianjin area and northeastern China (e.g., by 3.19 μg/m3 in Beijing). Using the improved decomposition method, we found that the combined meteorological effect (e.g., drastically elevated humidity levels and weakened airflow) substantially increased PM2.5 concentrations in northern China: the most substantial increases were in the Beijing–Tianjin–Hebei region (e.g., by 26.79 μg/m3 in Beijing). On excluding the meteorological effects, PM2.5 concentrations substantially decreased across China (e.g., by 21.84 μg/m3 in Beijing), evidencing that the strict restrictions on human activities indeed decreased PM2.5 concentrations. The unfavorable meteorological conditions, however, overwhelmed the beneficial effects of emission reduction, causing the severe haze pollution. These results indicate that the integrated meteorological effects should be considered to differentiate the meteorological and anthropogenic effects on severe air pollution. © 2021 Elsevier Ltd
关键词	Air pollution COVID-19 Humidity Meteorology Pollutant emission
语种	英语
scopus关键词	Emission control; Anthropogenic effects; Anthropogenic factors; Beneficial effects; Decomposition methods; Meteorological condition; Meteorological effects; Meteorological factors; PM2.5 concentration; Air pollution; air quality; anthropogenic effect; atmospheric pollution; concentration (composition); COVID-19; decomposition analysis; haze; meteorology; particle size; particulate matter; air pollution; air quality; airflow; Article; China; concentration (parameter); controlled study; coronavirus disease 2019; environmental temperature; haze; human; human activities; humidity; lockdown; meteorological phenomena; particulate matter 2.5; priority journal; quantitative analysis; statistical model; wind; wind decomposition method; wind speed; Beijing [China]; China; Tianjin; 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/248541
作者单位	Division of Environment and Sustainability, The Hong Kong University of Science and Technology, Hong Kong; Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen, China; Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong; Department of Mathematics, The Hong Kong University of Science and Technology, Hong Kong; Jockey Club School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong; Department of Urban Planning and Design, The University of Hong Kong, Hong Kong
推荐引用方式 GB/T 7714	Song Y.,Lin C.,Li Y.,et al. An improved decomposition method to differentiate meteorological and anthropogenic effects on air pollution: A national study in China during the COVID-19 lockdown period[J],2021,250.
APA	Song Y..,Lin C..,Li Y..,Lau A.K.H..,Fung J.C.H..,...&Lao X.Q..(2021).An improved decomposition method to differentiate meteorological and anthropogenic effects on air pollution: A national study in China during the COVID-19 lockdown period.ATMOSPHERIC ENVIRONMENT,250.
MLA	Song Y.,et al."An improved decomposition method to differentiate meteorological and anthropogenic effects on air pollution: A national study in China during the COVID-19 lockdown period".ATMOSPHERIC ENVIRONMENT 250(2021).