干旱区生态环境知识资源中心(Arid): Changes in physical and chemical properties of urban atmospheric aerosols and ozone during the COVID-19 lockdown in a semi-arid region

Arid

DOI	10.1016/j.atmosenv.2022.119270
	Changes in physical and chemical properties of urban atmospheric aerosols and ozone during the COVID-19 lockdown in a semi-arid region
	Chang, Yi; Du, Tao; Song, Xin; Wang, Wenfang; Tian, Pengfei; Guan, Xu; Zhang, Naiyue; Wang, Min; Guo, Yumin; Shi, Jinsen; Zhang, Lei
通讯作者	Tian, PF
来源期刊	ATMOSPHERIC ENVIRONMENT
ISSN	1352-2310
EISSN	1873-2844
出版年	2022
卷号	287
英文摘要	The synergistic response of urban atmospheric aerosols and ozone (O-3) to reduction of anthropogenic emissions is complicated and still needs further study. Thus, the changes in physical and chemical properties of urban atmospheric aerosols and O-3 during the Coronavirus Disease 2019 (COVID-19) lockdown were investigated at three urban sites and one rural site in Lanzhou with semi-arid climate. Fine particulate matter (PM2.5) decreased at four sites by similar to 20% while O-3 increased by >100% at two urban sites during the COVID-19 lockdown. Both primary emissions and secondary formation of PM2.5 decreased during the lockdown. Significant increase in both sulfur and nitrogen oxidation ratios was found in the afternoon, which accounted for 48.7% of the total sulfate and 40.4% of the total nitrate, respectively. The positive matrix factorization source apportionment revealed increased contribution of secondary formation and decreased contribution of vehicle emissions. Aerosol scattering and absorption decreased by 33.6% and 45.3%, resulting in an increase in visibility by 30% and single scattering albedo (SSA) at 520 nm slightly increased by 0.02. The enhanced O-3 production was explained by increased volatile organic compounds to nitrogen oxides ratio, decreased aerosol, as well as increased SSA. The primary emissions of secondary aerosol precursors significantly decreased while Ox (i.e., NO2 and O-3) exhibited little change. Consequently, Ox to CO ratio, PM2.5 to elemental carbon (EC) ratio, secondary inorganic aerosols to EC ratio, and secondary organic carbon to EC ratio increased, confirming enhanced secondary aerosol production efficiency during the lockdown. Positive feedback among O-3 concentration, secondary aerosol formation, and SSA was revealed to further promote O-3 production and secondary aerosol formation. These results provide scientific guidance for collaborative management of O-3 and particulate matter pollution for cities with semi-arid climate.
英文关键词	Atmospheric aerosols Ozone Single scattering albedo Collaborative management
类型	Article
语种	英语
开放获取类型	Green Published
收录类别	SCI-E
WOS记录号	WOS:000861237100001
WOS关键词	YANGTZE-RIVER DELTA ; NORTH CHINA PLAIN ; PARTICULATE MATTER ; SURFACE-OZONE ; AIR-QUALITY ; VERTICAL-DISTRIBUTION ; OPTICAL-PROPERTIES ; PM2.5 ; POLLUTION ; IMPACT
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/391944
推荐引用方式 GB/T 7714	Chang, Yi,Du, Tao,Song, Xin,et al. Changes in physical and chemical properties of urban atmospheric aerosols and ozone during the COVID-19 lockdown in a semi-arid region[J],2022,287.
APA	Chang, Yi.,Du, Tao.,Song, Xin.,Wang, Wenfang.,Tian, Pengfei.,...&Zhang, Lei.(2022).Changes in physical and chemical properties of urban atmospheric aerosols and ozone during the COVID-19 lockdown in a semi-arid region.ATMOSPHERIC ENVIRONMENT,287.
MLA	Chang, Yi,et al."Changes in physical and chemical properties of urban atmospheric aerosols and ozone during the COVID-19 lockdown in a semi-arid region".ATMOSPHERIC ENVIRONMENT 287(2022).