银川市PM<sub>2.5</sub>的输送路径及潜在源解析

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Abstract The transport pathways and potential sources of PM_2.5 in Yinchuan City from 2015 to 2017 were investigated by backward trajectory clustering analysis, potential source contribution function (PSCF) and concentration weighted trajectory analysis (CWT) method, based on PM_2.5 hourly mass concentration and meteorological data in Yinchuan City from 2015 to 2017. The mass concentration of PM_2.5 trend in Yinchuan City firstly increased with the highest value of (54.25±20.91)μg/m³ in 2016, and then decreased from 2013 to 2018. The highest PM_2.5 concentration occurred in winter (75.11±29.21)μg/m³ and the lowest value showed in summer (31.83±7.09)μg/m³ among the four seasons. The major transport pathways were from the northwest of Yinchuan City for all seasons. The long-distance transportation of air masses mostly occurred in spring, autumn and winter, while the short-distance transportation of air masses was the main pathway in summer. PSCF and CWT showed that northwest and southeast channels were the largest potential source regions of PM_2.5 in winter, including the central and eastern Xinjiang, Northern Qinghai Province, Hexi Corridor Area, southwestern Inner Mongolia, southern Gansu Province and northwestern Ningxia. The main potential source regions in spring and autumn located in the border area between eastern Xinjiang and Gansu Province, the southeastern of Gansu Province, Northern Hubei, southwestern Shaanxi and northern Chongqing. The potential source region of PM_2.5 in Yinchuan was the smallest in summer, mainly in eastern Xinjiang and the Gansu border area. During the heavy pollution period, the main transport paths of PM_2.5 came from the northwest and the potential source regions were mainly located in eastern Xinjiang and Gansu border, southwestern Inner Mongolia and Gansu border, and the central and southern Gansu Province. Therefore, on the basis of wind prevention and sand fixation measures, enhancing regional environmental cooperation and pollution control are effective air pollution measures to alleviate Yinchuan as well as Beijing-Tianjin-Hebei region.

Key words： PM_2.5 mass concentration cluster analysis PSCF CWT Yinchuan

Received: 02 December 2020

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X513

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	YU Chuang
	ZHANG Yu-xiu
	CHEN Wei

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YU Chuang,ZHANG Yu-xiu,CHEN Wei. The transport pathways and potential source regions of PM_2.5 in Yinchuan, China[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(7): 3055-3065.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I7/3055

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