太原市大气PM<sub>2.5</sub>季节传输路径和潜在源分析

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Abstract In order to study the transmission paths and pollution source areas of atmospheric PM_2.5 in different seasons in Taiyuan City, the cluster analysis of daily 48-hour airflow backward trajectories during 2017 to 2018 was conducted, based on the Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) model and global data assimilation system (GDAS) meteorological element data from National Centers for Environmental Prediction (NCEP), and weighted potential source contribution function (WPSCF) and weighted concentration-weighted trajectory (WCWT) were calculated by combining with hourly pollutant concentration data. The results showed that the sort orders of the average mass concentrations of PM_2.5 in different seasons of Taiyuan city were as follows:winter (77.56μg/m³) > autumn (69.89μg/m³) > spring (63.78μg/m³) > summer (45.51μg/m³). It seemed to exist the same source and the secondary conversion process between PM_2.5 and SO₂, NO₂ and CO. The dominant pollutant transport trajectories of spring, autumn and winter were short distance and slow moving speed of airflow in the west and northwest directions; and the dominant transport trajectories of summer was in the south and east directions. The potential source areas of PM_2.5 presented the obvious seasonal variations:in the summer, Taiyuan local and Jinzhong areas contributed greatly to the PM_2.5 pollutions in Taiyuan City, while the PM_2.5 pollutions of spring, autumn and winter were mainly affected by the central and northern Shanxi, Luliang, Linfen and Jinzhong areas.

Key words： PM_2.5 backward trajectories cluster analysis potential source contribution function (PSCF) concentration-weighted trajectory (CWT)

Received: 26 December 2018

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X513

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	Articles by authors
	REN Pu-hui
	XIE Jing-fang
	JIANG Hong-jin
	WANG Shu-nan
	LIU Rui-qing

Cite this article:

REN Pu-hui,XIE Jing-fang,JIANG Hong-jin等. Transport p athways and p otential s ources of PM_2.5 in different seasons in Taiyuan city[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(8): 3144-3151.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I8/3144

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