北京城区PM<sub>2.5</sub>输送途径与潜在源区贡献的四季差异分析

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Abstract

Both HYSPLIT backward trajectory mode and Global Data Assimilation System (GDAS) meteorological data from the National Centers for Environmental Prediction (NCEP) were used to analyze the three-day backward trajectories of hourly airflow in Beijing urban from May 1^st, 2014 to April 30^st, 2015. Clustering analysis was used to classify the airflow backward trajectories of Beijing urban in different seasons. The hourly ground PM_2.5 observations were also used to analyze the spatial characteristics of different transport pathways and its contribution to the PM_2.5 concentration in Beijing urban. Potential source contribution function (PSCF) and concentration-weighted trajectory (CWT) were applied to identify the potential source-zones (PSZs) and its contribution to Beijing urban PM_2.5 in different seasons during the study period. This study revealed that the Beijing airflows were significantly characterized by monsoons, and the PTZs of Beijing urban PM_2.5 varied a lot in different seasons during the study period: a) in the spring, it mainly located in northwest China, North China Plain and YellowRiver-HuaiRiver plain; b) in the summer, it mainly located in Shandong, north Jiangsu and Yellow Sea; c) in the fall, it mainly located in south Hebei, west Shandong, central Shandong and the adjoining areas of Jiangsu, Shandong, Henan and Anhui Provinces; d) in the winter, it mainly located in south Hebei, northwest Shandong, north Shanxi, Shaanxi, central Inner Mongolia and south Mongolia. The airflows from Shandong and south Hebei carried high concentrations of PM_2.5 in all seasons, while the airflows from northwest China carried middle concentrations of PM_2.5 in winter and spring.

Key words： PM_2.5 concentration backward trajectory clustering analysis transport pathway potential source-zone (PSZ) Beijing urban

Received: 10 January 2016

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	Articles by authors
	REN Chuan-bin
	WU Li-xin
	ZHANG Yuan-yuan
	LI Jia-le
	CHAI Man
	XIANG Cheng-cheng

Cite this article:

REN Chuan-bin,WU Li-xin,ZHANG Yuan-yuan等. Analyze to the seasonal differences of transport pathways and potential source-zones of Beijing Urban PM_2.5[J]. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(9): 2591-2598.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2016/V36/I9/2591

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