气候变化领域集成服务门户(CCPortal): NOx Emission Changes Over China During the COVID-19 Epidemic Inferred From Surface NO2 Observations

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DOI	10.1029/2020GL090080
	NOx Emission Changes Over China During the COVID-19 Epidemic Inferred From Surface NO2 Observations
	Feng S.; Jiang F.; Wang H.; Wang H.; Ju W.; Shen Y.; Zheng Y.; Wu Z.; Ding A.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:19
英文摘要	The COVID-19 epidemic has substantially limited human activities and affected anthropogenic emissions. In this work, daily NOx emissions are inferred using a regional data assimilation system and hourly surface NO2 measurement over China. The results show that because of the coronavirus outbreak, NOx emissions across the whole mainland China dropped sharply after 31 January, began to rise slightly in certain areas after 10 February, and gradually recover across the country after 20 February. Compared with the emissions before the outbreak, NOx emissions fell by more than 60% and ~30% in many large cities and most small to medium cities, respectively. Overall, NOx emissions were reduced by 36% over China, which were mainly contributed by transportation. Evaluations show that the inverted changes over eastern China are credible, whereas those in western China might be underestimated. These findings are of great significance for exploring the reduction potential of NOx emissions in China. ©2020. The Authors.
英文关键词	Earth sciences; Geophysics; Anthropogenic emissions; Coronaviruses; Data assimilation systems; Eastern China; Human activities; Mainland chinas; Reduction potential; Western China; Nitrogen oxides; anthropogenic effect; emission; epidemic; human activity; nitrogen oxides; observational method; traffic emission; China; Coronavirus
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169643
作者单位	Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, International Institute for Earth System Science, Nanjing University, Nanjing, China; Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing, China; School of Atmospheric Sciences, Nanjing University, Nanjing, China; Chongqing Institute of Meteorological Sciences, Chongqing, China
推荐引用方式 GB/T 7714	Feng S.,Jiang F.,Wang H.,et al. NOx Emission Changes Over China During the COVID-19 Epidemic Inferred From Surface NO2 Observations[J],2020,47(19).
APA	Feng S..,Jiang F..,Wang H..,Wang H..,Ju W..,...&Ding A..(2020).NOx Emission Changes Over China During the COVID-19 Epidemic Inferred From Surface NO2 Observations.Geophysical Research Letters,47(19).
MLA	Feng S.,et al."NOx Emission Changes Over China During the COVID-19 Epidemic Inferred From Surface NO2 Observations".Geophysical Research Letters 47.19(2020).