气候变化领域集成服务门户(CCPortal): Enhancement of nanoparticle formation and growth during the COVID-19 lockdown period in urban Beijing

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DOI	10.5194/acp-21-7039-2021
	Enhancement of nanoparticle formation and growth during the COVID-19 lockdown period in urban Beijing
	Shen X.; Sun J.; Yu F.; Wang Y.; Zhong J.; Zhang Y.; Hu X.; Xia C.; Zhang S.; Zhang X.
发表日期	2021
ISSN	1680-7316
起始页码	7039
结束页码	7052
卷号	21 期号:9
英文摘要	Influenced by the spread of the global 2019 novel coronavirus (COVID-19) pandemic, primary emissions of particles and precursors associated with anthropogenic activities decreased significantly in China during the Chinese New Year of 2020 and the lockdown period (24 January-16 February 2020). The 2-month measurements of the number size distribution of neutral particles and charged ions showed that during the lockdown (LCD) period, the number concentration of particles smaller than 100 nm decreased by approximately 40% compared to the pre-LCD period in January. However, the accumulation mode particles increased by approximately 20% as several polluted episodes contributed to secondary aerosol formation. In this study, new particle formation (NPF) events were found to be enhanced in the nucleation and growth processes during the LCD period, as indicated by the higher formation rate of 2 nm particles (J2) and the subsequent growth rate (GR). The relevant precursors, e.g., SO2 and NO2, showed a clear reduction, and O3 increased by 80%during LCD period, as compared with pre- LCD. The volatile organic vapors showed different trends due to their sources. The proxy sulfuric acid during the LCD period increased by approximately 26 %, as compared with pre-LCD. The major oxidants (O3, OH, and NO3) of VOCs were also found to be elevated during LCD. That indicated higher J2 and GR (especially below 5 nm) during the LCD period were favored by the increased concentration level of condensing vapors and decreased condensation sink. Several heavy haze episodes have been reported by other studies during the LCD period; however, the increase in nanoparticle number concentration should also be considered. Some typical NPF events produced a high number concentration of nanoparticles that intensified in the following days to create severe aerosol pollution under unfavorable meteorological conditions. Our study confirms a significant enhancement of the nucleation and growth process of nanoparticles during the COVID-19 LCD in Beijing and highlights the necessity of controlling nanoparticles in current and future air quality management. © Author(s) 2021.
语种	英语
scopus关键词	aerosol formation; air quality; atmospheric pollution; concentration (composition); COVID-19; nanoparticle; nucleation; particle size; size distribution; urban atmosphere; Beijing [Beijing (ADS)]; Beijing [China]; China; Coronavirus
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/246911
作者单位	State Key Laboratory of Severe Weather and Key Laboratory of Atmospheric Chemistry of CMA, Chinese Academy of Meteorological Sciences, Beijing, 100081, China; Atmospheric Sciences Research Center, State University of New York at Albany, 251 Fuller Road, Albany, NY 12203, United States; College of Earth Science, University of Chinese Academy of Sciences, Beijing, 100049, China; School of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing, 210044, China
推荐引用方式 GB/T 7714	Shen X.,Sun J.,Yu F.,et al. Enhancement of nanoparticle formation and growth during the COVID-19 lockdown period in urban Beijing[J],2021,21(9).
APA	Shen X..,Sun J..,Yu F..,Wang Y..,Zhong J..,...&Zhang X..(2021).Enhancement of nanoparticle formation and growth during the COVID-19 lockdown period in urban Beijing.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(9).
MLA	Shen X.,et al."Enhancement of nanoparticle formation and growth during the COVID-19 lockdown period in urban Beijing".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.9(2021).