Enhanced formation of secondary organic aerosol from photochemical oxidation during the COVID-19 lockdown in a background site in Northwest China

doi:10.1016/j.scitotenv.2021.144947

CORC > 地球环境研究所 > 中国科学院地球环境研究所 > 粉尘与环境研究室

	Enhanced formation of secondary organic aerosol from photochemical oxidation during the COVID-19 lockdown in a background site in Northwest China
	Zhong, Haobin 1,2,3; Huang, Ru-Jin 1,2,4; Chang, Yunhua 5,6; Duan, Jing 1,2; Lin, Chunshui 1,2; Chen, Yang 7
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2021-07-15
卷号	778 页码:7
关键词	COVID-19 OOA aqSOA Lockdown Secondary formation
ISSN号	0048-9697
DOI	10.1016/j.scitotenv.2021.144947
通讯作者	Huang, Ru-Jin(rujin.huang@ieecas.cn)
英文摘要	The COVID-19 pandemic has drastically affected the economic and social activities, leading to large reductions in anthropogenic emissions on a global scale. Despite the reduction of primary emissions during the lockdown period, heavy haze pollution was observed unexpectedly in megacities in North and East China. In this study, we conducted online measurements of organic aerosol in a background site before and during the lockdown in Guanzhong basin, Northwest China. The oxygenated organic aerosol (OOA) increased from 24% of total OA (3.2 +/- 1.6 mu g m(-3)) before lockdown to 54% of total OA (4.5 +/- 1.3 mu g m(-3)) during lockdown, likely due to substantial decrease of NOx emissions during lockdown which resulted in large increase of O-3 and thus atmospheric oxidizing capacity. OOA showed higher mass concentrations and fractional contributions during lockdown than before lockdown, and increased with the increase of Ox in both periods. In comparison, aqueous secondary organic aerosol (aqSOA) showed high mass concentrations and fractional contributions in both polluted periods before and during lockdown with the increase of aerosol liquid water content (ALWC). The increase of aqSOA under high ALWC conditions is very likely the reason of pollution events during lockdown. Combined with trajectory analysis, the absence of Guanzhong cluster in polluted period during lockdown may play a key role in the OA variations between two polluted periods. In addition, when comparing the clusters from the same transmission directions between before lockdown and during lockdown, the OA fractions showed similar variations during lockdown in all clusters, suggesting the OA variations are widespread in northwest China. (C) 2021 Published by Elsevier B.V.
资助项目	National Natural Science Foundation of China (NSFC)[41925015] ; National Natural Science Foundation of China (NSFC)[91644219] ; National Natural Science Foundation of China (NSFC)[41877408] ; Chinese Academy of Sciences[ZDBSLYDQC001] ; Cross Innovative Team fund from the State Key Laboratory of Loess and Quaternary Geology[SKLLQGTD1801]
WOS关键词	CHEMICAL-COMPOSITION ; MULTILINEAR ENGINE ; HAZE EVENTS ; PHOTOOXIDATION ; PHOTOLYSIS ; MODEL
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000655719100011
资助机构	National Natural Science Foundation of China (NSFC) ; Chinese Academy of Sciences ; Cross Innovative Team fund from the State Key Laboratory of Loess and Quaternary Geology
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/16750]
专题	地球环境研究所_粉尘与环境研究室第四纪科学与全球变化卓越创新中心
通讯作者	Huang, Ru-Jin
作者单位	1.Chinese Acad Sci, State Key Lab Loess & Quaternary Geol SKLLQG, Ctr Excellence Quaternary Sci & Global Change, Inst Earth Environm, Xian 710061, Peoples R China 2.Chinese Acad Sci, Key Lab Aerosol Chem & Phys, Inst Earth Environm, Xian 710061, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Xi An Jiao Tong Univ, Inst Global Environm Change, Xian 710049, Peoples R China 5.Nanjing Univ Informat Sci & Technol, KLME, Nanjing, Peoples R China 6.Nanjing Univ Informat Sci & Technol, Yale NUIST Ctr Atmospher Environm, CIC FEMD, Nanjing, Peoples R China 7.Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China
推荐引用方式 GB/T 7714	Zhong, Haobin,Huang, Ru-Jin,Chang, Yunhua,et al. Enhanced formation of secondary organic aerosol from photochemical oxidation during the COVID-19 lockdown in a background site in Northwest China[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2021,778:7.
APA	Zhong, Haobin,Huang, Ru-Jin,Chang, Yunhua,Duan, Jing,Lin, Chunshui,&Chen, Yang.(2021).Enhanced formation of secondary organic aerosol from photochemical oxidation during the COVID-19 lockdown in a background site in Northwest China.SCIENCE OF THE TOTAL ENVIRONMENT,778,7.
MLA	Zhong, Haobin,et al."Enhanced formation of secondary organic aerosol from photochemical oxidation during the COVID-19 lockdown in a background site in Northwest China".SCIENCE OF THE TOTAL ENVIRONMENT 778(2021):7.