Transport pathways and potential source regions of PM2.5 in Wuhai City of northwest arid area

doi:10.7523/j.ucas.2020.0055

Abstract

Abstract: Wuhai was one of the major coal industry cities in northwest arid area of China, the concentration variation characteristics, transport pathways, and the potential source regions of PM_2.5 were unclear. The transport pathways and the potential source regions of PM_2.5 in Wuhai were discussed by cluster analysis, potential source contribution function (PSCF) and concentration-weighted trajectory (CWT) methods based on the hourly monitoring data of PM_2.5 mass concentration in Wuhai from 2016 to 2018. Results showed that the average annual concentration of PM_2.5 had a downward trend during 2016-2018, with the highest concentration in winter and the lowest in summer. Cluster analysis showed that the northwesterly pathways were the major transport pathway of PM_2.5 for all seasons. The long-distance transport airflow mostly occurred in spring, autumn, and winter, the concentration of PM_2.5 in four trajectories was about 97.96-151.33μg·m^-3, while the short-distance transport airflow was main pathway in summer, its concentration of PM_2.5 was about 87.11-96.88μg·m^-3. The PSCF and CWT analysis indicated that the potential source regions of PM_2.5 were the largest in winter, mainly occurred in Kumtag Desert, Qaidam Basin, Tengger Desert, Badain Jaran Desert, and Hexi Corridor Area. The main potential source regions in spring and autumn were located in Kumtag Desert, and Hexi Corridor Area. The potential source region was the smallest in summer, mainly came from Hexi Corridor Area. During the heavy pollution period, the main transport pathways of PM_2.5 came from northwest also, the potential source regions were mainly located in the border area of Qinghai and Gansu, parts of eastern Xinjiang and southern Wuhai. These results showed that the potential source regions of PM_2.5 in Wuhai were mainly located in the northwest arid desert area. Therefore, the implementation of wind prevention, sand fixation, and desertification control could effectively improve the air quality of Wuhai and the northwestern area of China.

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

CLC Number:

YU Chuang, CHEN Wei, ZHANG Yuxiu. Transport pathways and potential source regions of PM_2.5 in Wuhai City of northwest arid area[J]. Journal of University of Chinese Academy of Sciences, 2022, 39(1): 43-54.

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Transport pathways and potential source regions of PM_2.5 in Wuhai City of northwest arid area

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