气候变化领域集成服务门户(CCPortal): Disentangling the Impact of the COVID-19 Lockdowns on Urban NO2 From Natural Variability

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DOI	10.1029/2020GL089269
	Disentangling the Impact of the COVID-19 Lockdowns on Urban NO2 From Natural Variability
	Goldberg D.L.; Anenberg S.C.; Griffin D.; McLinden C.A.; Lu Z.; Streets D.G.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:17
英文摘要	TROPOMI satellite data show substantial drops in nitrogen dioxide (NO2) during COVID-19 physical distancing. To attribute NO2 changes to NOx emissions changes over short timescales, one must account for meteorology. We find that meteorological patterns were especially favorable for low NO2 in much of the United States in spring 2020, complicating comparisons with spring 2019. Meteorological variations between years can cause column NO2 differences of ~15% over monthly timescales. After accounting for solar angle and meteorological considerations, we calculate that NO2 drops ranged between 9.2% and 43.4% among 20 cities in North America, with a median of 21.6%. Of the studied cities, largest NO2 drops (>30%) were in San Jose, Los Angeles, and Toronto, and smallest drops (<12%) were in Miami, Minneapolis, and Dallas. These normalized NO2 changes can be used to highlight locations with greater activity changes and better understand the sources contributing to adverse air quality in each city. ©2020. The Authors.
英文关键词	Air quality; Drops; Los angeles; Meteorological patterns; Meteorological variation; Minneapolis; Natural variability; Nitrogen dioxides; NOx emissions; Satellite data; Nitrogen oxides; air quality; atmospheric pollution; emission; metropolitan area; nitrate; nitrogen dioxide; satellite data; urban area; urban atmosphere; California; Canada; Dallas; Florida [United States]; Los Angeles [California]; Miami; Minneapolis; Minnesota; North America; Ontario [Canada]; San Jose [California]; Texas; Toronto; United States
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/169800
作者单位	Department of Environmental and Occupational Health, George Washington University, Washington, DC, United States; Energy Systems Division, Argonne National Laboratory, Lemont, IL, United States; Air Quality Research Division, Environment and Climate Change Canada (ECCC), Toronto, ON, Canada
推荐引用方式 GB/T 7714	Goldberg D.L.,Anenberg S.C.,Griffin D.,et al. Disentangling the Impact of the COVID-19 Lockdowns on Urban NO2 From Natural Variability[J],2020,47(17).
APA	Goldberg D.L.,Anenberg S.C.,Griffin D.,McLinden C.A.,Lu Z.,&Streets D.G..(2020).Disentangling the Impact of the COVID-19 Lockdowns on Urban NO2 From Natural Variability.Geophysical Research Letters,47(17).
MLA	Goldberg D.L.,et al."Disentangling the Impact of the COVID-19 Lockdowns on Urban NO2 From Natural Variability".Geophysical Research Letters 47.17(2020).