Characterization of the aerosol chemical composition during the COVID-19 lockdown period in Suzhou in the Yangtze River Delta,China

作     者：Honglei Wang Qing Miao Lijuan Shen Qian Yang Yezheng Wu Heng Wei Yan Yin Tianliang Zhao Bin Zhu Wen Lu Honglei Wang;Qing Miao;Lijuan Shen;Qian Yang;Yezheng Wu;Heng Wei;Yan Yin;Tianliang Zhao;Bin Zhu;Wen Lu

作者机构：Collaborative Innovation Center on Forecast and Evaluation of Meteorological DisastersKey Laboratory for Aerosol-Cloud-Precipitation of China Meteorological AdministrationNanjing University of Information Science&TechnologyNanjing 210044China Suzhou Environmental Monitoring CenterSuzhou 215000China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric ChemistryInstitute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2021年第33卷第4期

页      面：110-122页

核心收录：

学科分类：07[理学] 070602[理学-大气物理学与大气环境] 0706[理学-大气科学] 

基　　金：supported by the National Natural Science Foundation of China (Nos.91644224,41805096) the National Key Research and Development Program of China (No.2016YFA0602003) the China Postdoctoral Science Foundation (No.2018M640169) the Natural Science Research Project for Universities of Jiangsu Province,China (No.18KJB170011) 

主　　题：COVID-19 Lockdown Satellite data Chemical composition Diurnal variation 

摘      要：To control the spread of COVID-19,rigorous restrictions have been implemented in China,resulting in a great reduction in pollutant *** this study,we evaluated the air quality in the Yangtze River Delta during the COVID-19 lockdown period using satellite and ground-based data,including particle matter(PM),trace gases,water-soluble ions(WSIs) and black carbon(BC).We found that the impacts of lockdown policy on air quality cannot be accurately assessed using MODIS aerosol optical depth(AOD) data,whereas the tropospheric nitrogen dioxide(NO_(2)) vertical column density can well reflect the influences of these restrictions on human *** to the pre-COVID period,the PM_(2.5),PM_(10),NO_(2),carbon monoxide(CO),BC and WSIs during the lockdown in Suzhou were observed to decrease by 37.2%,38.3%,64.5%,26.1%,53.3% and 58.6%,respectively,while the sulfur dioxide(SO_(2)) and ozone(O_(3)) increased by 1.5% and 104.7%.The WSIs ranked in the order of NO_(3)~-NH_(4)^(+)SO_(4)^(2-)Cl~-Ca^(2+)K^(+)Mg^(2+)Na + during the lockdown *** comparisons with the ion concentrations during the pre-COVID period,we found that the ions NO 3-,NH 4 +,SO_(4)^(2-),Cl~-,Ca^(2+),K^(+) and Na^(+) decreased by 66.3%,48.8%,52.9%,56.9%,57.9% and 76.3%,respectively,during the lockdown,in contrast to Mg^(2+),which increased by 30.2%.The lockdown policy was found to have great impacts on the diurnal variations of Cl~-,SO_(4)^(2-),Na^(+) and Ca^(2+).