干旱区生态环境知识资源中心(Arid): Impact of aerosol-boundary layer interactions on PM2.5 pollution during cold air pool events in a semi-arid urban basin

Arid

DOI	10.1016/j.scitotenv.2024.171225
	Impact of aerosol-boundary layer interactions on PM2.5 pollution during cold air pool events in a semi-arid urban basin
	Zhang, Min; Tian, Pengfei; Zhao, Yiyang; Song, Xin; Liang, Jiening; Li, Jiayun; Zhang, Zhida; Guan, Xu; Cao, Xianjie; Ren, Yan; Shi, Jinsen; Zhang, Lei
通讯作者	Tian, PF ; Zhang, L
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2024
卷号	922
英文摘要	Global emission reductions still must address winter fine particulate matter (PM2.5) pollution in urban basins with enclosed terrains and frequent cold air pool (CAP) events when the temperatures within the basin are colder than above it. The effects of urban basin aerosol-boundary layer interactions on PM2.5 pollution during CAP events remain unclear. Intensive boundary layer observations in January 2021 and numerical models were used to investigate this issue in the semi-arid urban Lanzhou Basin of China. The results showed that CAPs formed because of the synoptic weather system that exacerbated the warming over the basin. The CAPs in this experiment were characterized by stronger temperature inversion (TI) layers in the vertical direction and lower relative humidity, lower wind speed, and weaker turbulence at the bottom of the basin compared to other conditions. The strong TI layers below the top of the basin inhibited the vertical dispersion of pollutants in the basin and concentrated the PM2.5 within a height of 0.3 km from the bottom of the basin. During CAP events, the proportion of elemental carbon in PM2.5 increased, whereas that of secondary inorganic species decreased. Aerosol absorption increased faster than scattering during CAP events. Therefore, the mean single scattering albedo decreased from 0.85 during non-CAP periods to 0.81 during CAP events. Radiosonde-sounding observations and numerical simulations indicated that aerosols accumulating in the lower basin heated the atmosphere during the daytime and facilitated boundary layer development via the stove effect (absorption aerosol heats lower atmosphere to promote boundary layer development). No significant dome effect (absorption aerosol heats the upper boundary layer to suppress boundary layer development) occurred during the two CAP events. These findings provide a theoretical basis for scientifically -guided PM2.5 pollution control in winter in isolated urban basins.
英文关键词	Urban basin Cold air pools Aerosol -boundary layer interaction Winter PM 2.5 pollution Semi -arid region
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001199037500001
WOS关键词	FINE PARTICULATE MATTER ; SALT LAKE VALLEY ; BLACK CARBON ; AMMONIUM-NITRATE ; SURFACE-OZONE ; CITY ; EVOLUTION ; EPISODES ; TRENDS ; CHINA
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/405475
推荐引用方式 GB/T 7714	Zhang, Min,Tian, Pengfei,Zhao, Yiyang,et al. Impact of aerosol-boundary layer interactions on PM2.5 pollution during cold air pool events in a semi-arid urban basin[J],2024,922.
APA	Zhang, Min.,Tian, Pengfei.,Zhao, Yiyang.,Song, Xin.,Liang, Jiening.,...&Zhang, Lei.(2024).Impact of aerosol-boundary layer interactions on PM2.5 pollution during cold air pool events in a semi-arid urban basin.SCIENCE OF THE TOTAL ENVIRONMENT,922.
MLA	Zhang, Min,et al."Impact of aerosol-boundary layer interactions on PM2.5 pollution during cold air pool events in a semi-arid urban basin".SCIENCE OF THE TOTAL ENVIRONMENT 922(2024).