乌鲁木齐市区与南郊山区颗粒物污染特征对比分析

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Abstract Based on the observational data of PM₁₀, PM_2.5 and PM₁ concentrations from October 2017 to August 2018 as well as NCEP reanalysis data of meteorology, this paper analyzed the variations of particulate concentrations in the urban area and the mountainous area in the southern suburbs of Urumqi, combined with HYSPLIT backward trajectory modelling, potential source contribution factor analysis (PSCF) and concentration weight trajectory analysis (CWT) to analyze the potential sources of particulate matter in urban areas. The results show that: (1) In the urban area, PM_2.5 exceeded the standard for 26 days, while in the southern suburbs, no PM_2.5 exceeded the standard, and the number of days exceeding the standard for PM₁₀ in the urban area was 3.5 times higher than that in the southern suburbs, The daily and monthly mean PM₁₀ concentrations in urban area is 2~7 times that in the southern suburban area. The urban area presented the seasonal characteristics of high in winter and low in summer, while the southern suburban area observed the highest in spring. (2) The diurnal variation of PM₁₀ in Urumqi has three peak values, PM_2.5 and PM₁ have bimodal distribution in the urban area, and the southern mountainous areas presented the bimodal distribution in diurnal PM₁₀ change. There is seasonal weekend effect. (3) The trajectory of the long and short clusters of air flow has a great influence on the concentrations of particulate matter in Urumqi. Air flows in spring and summer is traced from Central Asia, and air flow in autumn and winter from the surrounding areas of northern Xinjiang. (4) The seasonal variations of potential sources of particulate matter are significant, and the high values are mainly in Changji, Bazhou, Turpan and other surrounding areas. The central Asian area in northwest China is also one of the important sources of particulate matter.

Key words： particulate matter Urumqi backward trajectory clustering analysis potential source area contribution analysis concentration weight trajectory analysis PM_2.5

Received: 22 February 2022

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X513

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	ZHU Cui-yun
	HE Qing
	ZHAO Zhu-jun
	LIU Xin-chun
	PU Zong-chao

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ZHU Cui-yun,HE Qing,ZHAO Zhu-jun等. Comparative analysis of particulate pollution characteristics between Urumqi urban area and southern mountainous area[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(9): 4073-4085.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I9/4073

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