长治市沙尘天气污染特征及传输路径解析

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Abstract Three dust pollution processes in Changzhi were investigated. Typical pollution characteristics and transmission paths of dust weather in Changzhi were studied through analyzing the PM_2.5 and PM₁₀ concentrations, water-soluble ion components, meteorological conditions and aerosol optical characteristics. There were 8 days of dust weather in Changzhi in 2018. April was the most serious polluted month with 5days of dust weather and this was related to the adjustment of atmospheric circulation in spring and the frequent activities of warm and cold air. Before the occurrence of dust weather, atmosphere in Changzhi was affected by the cold air from west or northwest. The atmospheric stratification was unstable and the atmospheric circulation turned into meridional circulation, with an average wind speed of more than 4m/s. During the dust pollution process, the ratio of PM_2.5/PM₁₀ was lower than 0.3. The coarse particles made up a large part in the ambient air. The proportion of total water-soluble ions in PM_2.5 was decreased, and the concentration of Ca²⁺ was 4times higher than that before dust pollution. The dust was transported near the ground in winter, while transported at high altitude in spring and summer. The important potential sources of dust in Changzhi city were desert areas in Mongolia, central Kazakhstan and central and northern Xinjiang. The transmission paths were generally northwest path and northern path. There were two routes in the northwest path:Kazakhstan-north central Xinjiang-west Inner Mongolia-Changzhi and north central Xinjiang-west Inner Mongolia-Changzhi. The northern route was Mongolia-central Inner Mongolia-northern Shanxi-Changzhi.

Key words： dust pollution day particulate matter Changzhi potential source area transmission path

Received: 06 March 2020

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X513

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	Articles by authors
	DENG Meng-jie
	YAN Yu-long
	HU Dong-mei
	DUAN Xiao-lin
	LIU Zhuo-cheng
	PENG Lin

Cite this article:

DENG Meng-jie,YAN Yu-long,HU Dong-mei等. Analysis of dust weather pollution characteristics and transmission paths in Changzhi, China[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(10): 4275-4283.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I10/4275

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