2015~2021年景洪市PM<sub>2.5</sub>的传输路径及潜在源区

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Abstract This study analyzed the characteristics of air pollutants in Jinghong City from 2015 to 2021, and obtained the months when the daily PM_2.5 exceeded the Class-2limit values of the National Ambient Air Quality Standard (NAAQS). Based on Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) model, 72-hour daily backward trajectories in those months were calculated, combined with PM_2.5 concentration, the transport pathways and potential source regions during those months in Jinghong city were determined through the methods of analysing cluster, potential source contribution factor and concentration weighted trajectory factor. The results shown that the months of PM_2.5 exceeding standard were concentrated on February, March, April and May in Jinghong City. The transport pathways of PM_2.5 during February to May in Jinghong City mainly originate from west, southwest and south, with medium and short-range, and low-altitude transports corresponded to high concentration of PM_2.5 pollution. The potential source regions of PM_2.5 in Jinghong during February to May were mainly located in the central region of Myanmar, the northwest region of Laos and the northern region of Thailand. The results of normalized concentration weighted trajectory factor exhibited that the source regions of PM_2.5 in Jinghong City during February to May were concentrated in Myanmar, accounting for 41%~50%, with Thailand and Laos accounting for 21%~27%, 5%~12%, 2% and 2%, respectively. To further investigate the sources of the PM_2.5 in Jinghong, the distribution of fires counts in the indo-China and its correlation with PM_2.5 in Jinghong from 2015 to 2021 were analyzed. Further results demonstrated that the main source of PM_2.5 in Jinhong city during February to May was open biomass burning from Myanmar. These results in this study have guiding significance for Jinghong city to establish cross-border regional joint prevention and control measures and to study future climate change.

Key words： PM_2.5 Jinghong City cluster analysis potential source contribution function concentration weighted trajectory

Received: 15 April 2022

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X513

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	LIU Xu-yan
	HAN Xiu-zhen
	LIANG Lin-lin
	ZHU Lin

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LIU Xu-yan,HAN Xiu-zhen,LIANG Lin-lin等. Analysis of transport pathways and potential source regions of PM_2.5 in Jinghong from 2015 to 2021[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(11): 5023-5035.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I11/5023

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