气候变化领域集成服务门户(CCPortal): An observation approach in evaluation of ozone production to precursor changes during the COVID-19 lockdown

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DOI	10.1016/j.atmosenv.2021.118618
	An observation approach in evaluation of ozone production to precursor changes during the COVID-19 lockdown
	Qi J.; Mo Z.; Yuan B.; Huang S.; Huangfu Y.; Wang Z.; Li X.; Yang S.; Wang W.; Zhao Y.; Wang X.; Wang W.; Liu K.; Shao M.
发表日期	2021
ISSN	1352-2310
卷号	262
英文摘要	The increase of surface ozone during the Corona Virus Disease 2019 (COVID-19) lockdown in China has aroused great concern. In this study, we combine 1.5 years of measurements for ozone, volatile organic compounds (VOCs), and nitrogen oxide (NOX) at four sites to investigate the effect of COVID-19 lockdown on surface ozone in Dongguan, an industrial city in southern China. We show that the average concentrations of NOX and VOCs decreased by 70%–77% and 54%–68% during the lockdown compared to pre-lockdown, respectively. Based on the source apportionment of VOCs, the contribution of industrial solvent use reduced significantly (86%–94%) during the lockdown, and climbed back slowly along with the re-opening of the industry after lockdown. A slight increase in mean ozone concentration (3%–14%) was observed during the lockdown. The rise of ozone was the combined effect of substantial increase at night (58%–91%) and small reduction in the daytime (1%–17%). These conflicting observations in ozone response between day and night to emission change call for a more detailed approach to diagnostic ozone production response with precursor changes, rather than directly comparing absolute concentrations. We propose that the ratio of daily Ox (i.e. ozone + NO2) enhancement to solar radiation can provide a diagnostic parameter for ozone production response during the lockdown period. Smaller ratio of daily OX (ozone + NO2) enhancement to solar radiation during the lockdown were observed from the long-term measurements in Dongguan, suggesting significantly weakened photochemistry during the lockdown successfully reduces local ozone production. Our proposed approach can provide an evaluation of ozone production response to precursor changes from restrictions of social activities during COVID-19 epidemic and also other regional air quality abatement measures (e.g. public mega-events) around the globe. © 2021 Elsevier Ltd
关键词	COVID-19 lockdown NOX Ozone Solar radiation VOCs
语种	英语
scopus关键词	Air quality; Diagnosis; Nitrogen oxides; Ozone; Quality control; Solar radiation; Viruses; Corona virus disease 2019 lockdown; Dongguan; NO $-2$; NO$-x$; Organic nitrogen; Ozone production; Production response; Surface ozone; Virus disease; Volatile organics; Volatile organic compounds; nitrogen oxide; ozone; solvent; volatile organic compound; air quality; COVID-19; epidemic; photochemistry; solar radiation; source apportionment; volatile organic compound; air quality; Article; China; controlled study; coronavirus disease 2019; epidemic; lockdown; photochemistry; social behavior; solar radiation; China; Dongguan; Guangdong; Coronavirus
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248299
作者单位	Institute for Environmental and Climate Research, Jinan University, Guangzhou, 511443, China; Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou, 511443, China; Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz, 55128, Germany; Bureau of Ecology and Environment of Dongguan, Dongguan, 523099, China
推荐引用方式 GB/T 7714	Qi J.,Mo Z.,Yuan B.,et al. An observation approach in evaluation of ozone production to precursor changes during the COVID-19 lockdown[J],2021,262.
APA	Qi J..,Mo Z..,Yuan B..,Huang S..,Huangfu Y..,...&Shao M..(2021).An observation approach in evaluation of ozone production to precursor changes during the COVID-19 lockdown.ATMOSPHERIC ENVIRONMENT,262.
MLA	Qi J.,et al."An observation approach in evaluation of ozone production to precursor changes during the COVID-19 lockdown".ATMOSPHERIC ENVIRONMENT 262(2021).