汾渭平原吕梁市颗粒物潜在源及输送通道分析

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Abstract Based on the particulate matter concentration and surface meteorological observation data of Lüliang city in Fenwei Plain from 2017 to 2019, this paper used backward trajectory cluster analysis and potential source contribution function (PSCF) methods to study the characteristics of PM₁₀ and PM_2.5 pollution and their potential source areas in winter in Lüliang city. Combining trajectory density analysis (TDA) and trajectory dwell time analysis (RTA) to supplement the classification of polluted transmission channels obtained by trajectory clustering analysis, and analyzed the transport characteristics of different transmission channels. This study found that the annual average concentration of particulate matter in Lüliang City decreased year by year from 2017 to 2019. Among them, PM₁₀ decreased by 28μg/m³, PM_2.5 decreased by 17μg/m³, and the decline was the largest in winter. The statistical analysis of the three-year winter wind direction, wind speed and concentration showed that the concentration of particulate matter in Lüliang was most significantly affected by the northeast and southwest winds because of the local topography of the Sanchuan River valley. The potential source area of PM₁₀ pollution in Lüliang was mainly located in the southwest, and the potential source areas of PM_2.5 pollution were mainly located in the southwest, east and southeast. The particulate pollution transmission channels can be summarized as: northwest, southwest and east (east and southeast) channels. The airflow in the northwest channel moved fast, passing through Xinjiang, Inner Mongolia, Gansu, and northern Shaanxi; The airflow in the southwest channel moved slowly, mainly passing through heavily polluted areas such as the Weihe Plain in central and southern Shaanxi. The airflow in the east channel moved slowly, it first traveled south along the eastern foot of the Taihang Mountains, and turned into Shanxi when passing through the valleys(Taihangxing, Jingxing, etc.) of the Taihang Mountains. When PM₁₀ pollution occurred, the northwest channel contributed the most, and the eastern channel contributed the least, and the majority of these two channels was lightly polluted, accounting for about 90%. When PM_2.5 pollution occurred, the proportion of light pollution under the three types of channels was lower than that of PM₁₀. The proportion of moderate pollution and above under the southwest and east channels were about 50%, the areas passed by the southwest and east channels were exactly the potential source locations calculated by PSCF, which also showed that the southwest and easterly airflows were likely to transport pollutants to Lvliang. Finally, the three transportation channels were verified by the wind field simulation results of the WRF model, which shows that the transportation channel results obtained in this study are valid, and the complex terrain and variable airflow are an important factor in the transmission channel. The wind field simulation of the WRF model intuitively explains the three types of pollution transmission channels, and the complex terrain is an important factor in the formation of pollution transmission channels. The pollution transport channels in the northwest and southwest are mainly affected by the Lüliang Mountains, and the eastward pollution transport channel is mainly affected by the Taihang Mountains and its Henggu.

Key words： trajectory clustering transmission channel particulate matter RTA TDA

Received: 01 December 2022

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X513

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	GAO Xing-ai
	PEI Kun-ning
	WANG Shu-min
	YAN Shi-ming
	WANG Yan
	JIANG Yun-sheng

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GAO Xing-ai,PEI Kun-ning,WANG Shu-min等. Analysis on the potential source and transmission channel of particulate matter in Lüliang City, Fenwei Plain[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(7): 2988-2999.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I7/2988

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