Analysis of Meteorological Conditions for Regional Haze Weather in Jiangxi and Research on the Forecasting Model

Liu Bo; Zhang Juanjuan

doi:10.16765/j.cnki.1673-7148.2025.03.010

Abstract：Based on the conventional surface observation data,sounding data and Final(FNL)rean-alysis data in Jiangxi Province from 2011 to 2022,417 regional haze weather processes are statistically analyzed in this paper.The characteristics of regional haze,such as high-and low-level synoptic situa-tion,surface wind speed,high-and low-level relative humidity,inversion and mixed layer height are ob-tained,and also compared with those of regional fog events.The results show that:(1)The Jiangxi re-gional haze events tend to occur in the winter December and January,more in the north and less in the south of the province.(2)The surface wind speeds during the regional haze processes are generally in the range of 1-3 m·s-1,and can reach 6 m·s-1 in cold frontal zones.Most of the relative humidity values below 925 hPa in the lower troposphere are below 75％,and those at 500 hPa in the upper air are less than 40％.(3)The regional haze processes are often accompanied by single-layer inversion,with high frequency of inversion appearing near the surface.The mixed layer is below the height of 800 m.(4)The surface situation is mainly composed of high pressure,low pressure and uniform pressure,of which the high-pressure bottom type is the most,followed by the cold frontal zone type.The upper air is mostly controlled by westerly or northwesterly winds.(5)Compared to regional fog,the surface wind speed con-ditions are similar in both fog and haze events,but the inversion intensity and low-level water vapor dur-ing regional haze processes are weaker.In addition,on the basis of these analyses,a synoptic conceptual model of regional haze weather of high pressure bottom type is established.