气候变化领域集成服务门户(CCPortal): Quantitative assessment of changes in surface particulate matter concentrations and precursor emissions over China during the COVID-19 pandemic and their implications for Chinese economic activity

CCPortal

DOI	10.5194/acp-21-10065-2021
	Quantitative assessment of changes in surface particulate matter concentrations and precursor emissions over China during the COVID-19 pandemic and their implications for Chinese economic activity
	Kim H.C.; Kim S.; Cohen M.; Bae C.; Lee D.; Saylor R.; Bae M.; Kim E.; Kim B.-U.; Yoon J.-H.; Stein A.
发表日期	2021
ISSN	1680-7316
起始页码	10065
结束页码	10080
卷号	21 期号:13
英文摘要	Sixty days after the lockdown of Hubei Province, where the coronavirus was first reported, China's true recovery from the pandemic remained an outstanding question. This study investigates how human activity changed during this period using observations of surface pollutants. By combining surface data with a three-dimensional chemistry model, the impacts of meteorological variations and variations in yearly emission control are minimized, demonstrating how pollutant levels over China changed before and after the Lunar New Year from 2017 to 2020. The results show that the reduction in NO2 concentrations, an indicator of emissions in the transportation sector, was clearly greater and longer in 2020 than in normal years and started to recover after 15 February. By contrast, PM2.5 emissions had not yet recovered by the end of March, showing a reduction of around 30% compared with normal years. SO2 emissions were not affected significantly by the pandemic. An additional model study using a top-down emission adjustment still confirms a reduction of around 25% in unknown surface PM2.5 emissions over the same period, even after realistically updating SO2 and NOx emissions. This evidence suggests that different economic sectors in China may be recovering at different rates, with the fastest recovery in transportation and a slower recovery likely in agriculture. The apparent difference between the recovery timelines of NO2 and PM2.5 implies that monitoring a single pollutant alone (e.g., NOx emissions) is insufficient to draw conclusions on the overall recovery of the Chinese economy. © 2021 Hyun Cheol Kim et al.
语种	英语
scopus关键词	atmospheric pollution; concentration (composition); COVID-19; epidemic; particulate matter; pollution monitoring; quantitative analysis; China; Hubei; Coronavirus; Indicator indicator
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/246759
作者单位	Air Resources Laboratory, National Oceanic and Atmospheric Administration, College Park, MD, United States; Cooperative Institute for Satellite Earth System Studies, University of Maryland, College Park, MD, United States; Department of Environmental and Safety Engineering, Ajou University, Suwon, South Korea; National Air Emission Inventory and Research Center, Sejong, South Korea; School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology, Gwangju, South Korea; Georgia Environmental Protection Division, Atlanta, GA, United States; Division of ClimateandEnvironmental Research, Seoul Institute of Technology, Seoul, South Korea
推荐引用方式 GB/T 7714	Kim H.C.,Kim S.,Cohen M.,et al. Quantitative assessment of changes in surface particulate matter concentrations and precursor emissions over China during the COVID-19 pandemic and their implications for Chinese economic activity[J],2021,21(13).
APA	Kim H.C..,Kim S..,Cohen M..,Bae C..,Lee D..,...&Stein A..(2021).Quantitative assessment of changes in surface particulate matter concentrations and precursor emissions over China during the COVID-19 pandemic and their implications for Chinese economic activity.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(13).
MLA	Kim H.C.,et al."Quantitative assessment of changes in surface particulate matter concentrations and precursor emissions over China during the COVID-19 pandemic and their implications for Chinese economic activity".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.13(2021).