Abstract:Based on the hourly concentration data of PM2.5 and surface wind field data in winter of Jincheng and Changzhi from 2017 to 2019, combined with HYSPLIT trajectory model and mesoscale numerical model WRFV4.2, the characteristics and transmission characteristics of PM2.5 pollution in winter in Southeast Shanxi were analyzed. The results showed that the pollution degree of PM2.5 in Jincheng in winter was higher than that in Changzhi. Affected by the terrain, southerly wind, northerly wind and northwest wind prevail on the ground in Jincheng, and the pollution direction was mainly southerly wind and northerly wind; The southerly wind prevails near the ground in Changzhi, and this wind direction had the highest frequency of pollution. The potential pollution source areas affecting Jincheng and Changzhi were mainly distributed in the west, northeast and southeast. The westward airflow came from central Shaanxi Province, the northeast airflow came from southwestern Hebei Province, and the southeast airflow came from central and eastern Henan Province. Pollution passing through the southeastern part of Shanxi mainly affected the central and southern parts of Shanxi Province and the southern part of Beijing. Through the numerical simulation of flow field, combined with the analysis results of potential source area and influence area, under the weather situation behind the pressure equalizing field or high pressure, the pollution transport path in the southeast of Shanxi included:Airflow from the Northeast (southwest of Hebei Province), transporting pollutants along the Fukou Xing in the northeast of Changzhi to the southeast of Shanxi, and the same northeast air flow continued southward along the eastern foot of the Taihang Mountain and then turned to the Taihang Xing at the junction of Shanxi and Henan to transport pollutants to the southeast of Shanxi; Airflow from the southeast (northern and east of Henan) transported pollutants; And airflow from the west (central and southern Shaanxi) transported pollutants. The pollutants were transported northward to the central and southern Shanxi Province through the southeast of Shanxi Province, and some were transported to the south of Beijing through Jingxing in the Middle East of Shanxi Province.
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