气候变化领域集成服务门户(CCPortal): Changes in satellite retrievals of atmospheric composition over eastern China during the 2020 COVID-19 lockdowns

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DOI	10.5194/acp-21-18333-2021
	Changes in satellite retrievals of atmospheric composition over eastern China during the 2020 COVID-19 lockdowns
	Field R.D.; Hickman J.E.; Geogdzhayev I.V.; Tsigaridis K.; Bauer S.E.
发表日期	2021
ISSN	1680-7316
起始页码	18333
结束页码	18350
卷号	21 期号:24
英文摘要	We examined daily level-3 satellite retrievals of Atmospheric Infrared Sounder (AIRS) CO, Ozone Monitoring Instrument (OMI) SO2 and NO2, and Moderate Resolution Imaging Spectroradiometer (MODIS) aerosol optical depth (AOD) over eastern China to understand how COVID-19 lockdowns affected atmospheric composition. Changes in 2020 were strongly dependent on the choice of background period since 2005 and whether trends in atmospheric composition were accounted for. Over central east China during the 23 January-8 April lockdown window, CO in 2020 was between 3% and 12% lower than average depending on the background period. The 2020 CO was not consistently less than expected from trends beginning between 2005 and 2016 and ending in 2019 but was 3%-4% lower than the background mean during the 2017-2019 period when CO changes had flattened. Similarly for AOD, 2020 was between 14% and 30% lower than averages beginning in 2005 and 14%-17% lower compared to different background means beginning in 2016. NO2 in 2020 was between 30% and 43% lower than the mean over different background periods and between 17% and 33% lower than what would be expected for trends beginning later than 2011. Relative to the 2016-2019 period when NO2 had flattened, 2020 was 30%-33% lower. Over southern China, 2020 NO2 was between 23% and 27% lower than different background means beginning in 2013, the beginning of a period of persistently lower NO2. CO over southern China was significantly higher in 2020 than what would be expected, which we suggest was partly because of an active fire season in neighboring countries. Over central east and southern China, 2020 SO2 was higher than expected, but this depended strongly on how daily regional values were calculated from individual retrievals and reflects background values approaching the retrieval detection limit. Future work over China, or other regions, needs to take into account the sensitivity of differences in 2020 to different background periods and trends in order to separate the effects of COVID-19 on air quality from previously occurring changes or from variability in other sources. © 2021 Robert D. Field et al.
语种	英语
scopus关键词	AIRS; atmospheric circulation; COVID-19; LOCKDOWN; MODIS; optical depth; satellite imagery; source apportionment; trend analysis; China
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/246360
作者单位	Nasa Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025, United States; Department of Applied Physics and Applied Mathematics, Columbia University, 2880 Broadway, New York, NY 10025, United States; Center for Climate Systems Research, Columbia University, 2880 Broadway, New York, NY 10025, United States
推荐引用方式 GB/T 7714	Field R.D.,Hickman J.E.,Geogdzhayev I.V.,et al. Changes in satellite retrievals of atmospheric composition over eastern China during the 2020 COVID-19 lockdowns[J],2021,21(24).
APA	Field R.D.,Hickman J.E.,Geogdzhayev I.V.,Tsigaridis K.,&Bauer S.E..(2021).Changes in satellite retrievals of atmospheric composition over eastern China during the 2020 COVID-19 lockdowns.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(24).
MLA	Field R.D.,et al."Changes in satellite retrievals of atmospheric composition over eastern China during the 2020 COVID-19 lockdowns".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.24(2021).