气候变化领域集成服务门户(CCPortal): Chemistry of Atmospheric Fine Particles During the COVID-19 Pandemic in a Megacity of Eastern China

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DOI	10.1029/2020GL091611
	Chemistry of Atmospheric Fine Particles During the COVID-19 Pandemic in a Megacity of Eastern China
	Liu L.; Zhang J.; Du R.; Teng X.; Hu R.; Yuan Q.; Tang S.; Ren C.; Huang X.; Xu L.; Zhang Y.; Zhang X.; Song C.; Liu B.; Lu G.; Shi Z.; Li W.
发表日期	2021
ISSN	0094-8276
卷号	48 期号:2
英文摘要	Air pollution in megacities represents one of the greatest environmental challenges. Our observed results show that the dramatic NOx decrease (77%) led to significant O3 increases (a factor of 2) during the COVID-19 lockdown in megacity Hangzhou, China. Model simulations further demonstrate large increases of daytime OH and HO2 radicals and nighttime NO3 radical, which can promote the gas-phase reaction and nocturnal multiphase chemistry. Therefore, enhanced NO3− and SO42− formation was observed during the COVID-19 lockdown because of the enhanced oxidizing capacity. The PM2.5 decrease was only partially offset by enhanced aerosol formation with its reduction reaching 50%. In particular, NO3− decreased largely by 68%. PM2.5 chemical analysis reveals that vehicular emissions mainly contributed to PM2.5 under normal conditions in Hangzhou. Whereas, stationary sources dominated the residual PM2.5 during the COVID-19 lockdown. This study provides evidence that large reductions in vehicular emissions can effectively mitigate air pollution in megacities. © 2020. The Authors.
英文关键词	Air pollution; Atmospheric chemistry; Chemical reactions; Phase interfaces; Aerosol formation; Air pollution in megacities; Atmospheric fine particles; Environmental challenges; Gas-phase reactions; Oxidizing capacity; Stationary sources; Vehicular emission; Chemical analysis
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/169215
作者单位	Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province, Department of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou, China; Hangzhou Meteorological Bureau, Hangzhou, China; School of Environment, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, China; School of Atmospheric Sciences, Nanjing University, Nanjing, China; State Key Laboratory of Severe Weather/Key Laboratory of Atmospheric Chemistry of China Meteorological Administration, Chinese Academy of Meteorological Sciences, Beijing, China; School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, United Kingdom; Department of Economics, University of Birmingham, Birmingham, United Kingdom
推荐引用方式 GB/T 7714	Liu L.,Zhang J.,Du R.,et al. Chemistry of Atmospheric Fine Particles During the COVID-19 Pandemic in a Megacity of Eastern China[J],2021,48(2).
APA	Liu L..,Zhang J..,Du R..,Teng X..,Hu R..,...&Li W..(2021).Chemistry of Atmospheric Fine Particles During the COVID-19 Pandemic in a Megacity of Eastern China.Geophysical Research Letters,48(2).
MLA	Liu L.,et al."Chemistry of Atmospheric Fine Particles During the COVID-19 Pandemic in a Megacity of Eastern China".Geophysical Research Letters 48.2(2021).