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Sci Total Environ

Title:		Ozone profile retrievals from TROPOMI: Implication for the variation of tropospheric ozone during the outbreak of COVID-19 in China
Author(s):		Zhao F; Liu C; Cai Z; Liu X; Bak J; Kim J; Hu Q; Xia C; Zhang C; Sun Y; Wang W; Liu J;
Address:		"Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230026, China. Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230026, China; Key Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei 230026, China; Anhui Province Key Laboratory of Polar Environment and Global Change, University of Science and Technology of China, Hefei 230026, China. Electronic address: chliu81@ustc.edu.cn. Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China. Electronic address: caizhaonan@mail.iap.ac.cn. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, United States. Pusan National University, Busan, Republic of Korea. Key Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China. School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China"
Journal Title:		Sci Total Environ
Year:		2021
Volume:		20201013
Issue:
Page Number:		142886 -
DOI:		10.1016/j.scitotenv.2020.142886
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Print) 0048-9697 (Linking)
Abstract:		"During the outbreak of the coronavirus disease 2019 (COVID-19) in China in January and February 2020, production and living activities were drastically reduced to impede the spread of the virus, which also caused a strong reduction of the emission of primary pollutants. However, as a major species of secondary air pollutant, tropospheric ozone did not reduce synchronously, but instead rose in some region. Furthermore, higher concentrations of ozone may potentially promote the rates of COVID-19 infections, causing extra risk to human health. Thus, the variation of ozone should be evaluated widely. This paper presents ozone profiles and tropospheric ozone columns from ultraviolet radiances detected by TROPOospheric Monitoring Instrument (TROPOMI) onboard Sentinel 5 Precursor (S5P) satellite based on the principle of optimal estimation method. We compare our TROPOMI retrievals with global ozonesonde observations, Fourier Transform Spectrometry (FTS) observation at Hefei (117.17 degrees E, 31.7 degrees N) and Global Positioning System (GPS) ozonesonde sensor (GPSO(3)) ozonesonde profiles at Beijing (116.46 degrees E, 39.80 degrees N). The integrated Tropospheric Ozone Column (TOC) and Stratospheric Ozone Column (SOC) show excellent agreement with validation data. We use the retrieved TOC combining with tropospheric vertical column density (TVCD) of NO(2) and HCHO from TROPOMI to assess the changes of tropospheric ozone during the outbreak of COVID-19 in China. Although NO(2) TVCD decreased by 63%, the retrieved TOC over east China increase by 10% from the 20-day averaged before the lockdown on January 23, 2020 to 20-day averaged after it. Because the production of ozone in winter is controlled by volatile organic compounds (VOCs) indicated by monitored HCHO, which did not present evident change during the lockdown, the production of ozone did not decrease significantly. Besides, the decrease of NO(x) emission weakened the titration of ozone, causing an increase of ozone"
Keywords:		*Air Pollutants/analysis Beijing *covid-19 China/epidemiology Communicable Disease Control Disease Outbreaks Environmental Monitoring Humans *Ozone/analysis SARS-CoV-2 Covid-19 Lockdown Ozone profile retrievals Soft calibration Tropomi;
Notes:		"MedlineZhao, Fei Liu, Cheng Cai, Zhaonan Liu, Xiong Bak, Juseon Kim, Jae Hu, Qihou Xia, Congzi Zhang, Chengxin Sun, Youwen Wang, Wei Liu, Jianguo eng Netherlands 2021/03/25 Sci Total Environ. 2021 Apr 10; 764:142886. doi: 10.1016/j.scitotenv.2020.142886. Epub 2020 Oct 13"