塔克拉玛干沙漠腹地晴天与沙尘暴天气大气边界层对比分析OACSTPCD

Based on GPS sounding and ground observation data from July 2017 and 2019 in the hinterland of the Taklimakan Desert,the characteristics of atmospheric boundary layer structure changes during summer sunny days and sandstorms in the desert hinterland were compared and analyzed by using methods such as potential temperature profile.The results indicate that there are significant differences in the structural characteristics of the atmospheric boundary layer between sunny days and sandstorms.On sunny days,the vertical distribution of various meteorological elements in the atmospheric boundary layer is relatively uniform.During the day,the convective boundary layer is deep,with a height of nearly 5 000 m,and the stable boundary layer is generally around 500 m at night.During sandstorms,the vertical variation of potential temperature and specific humidity in the boundary layer is relatively small,with a high wind speed of up to 24.0 m/s.The convective boundary layer during the day is around 1 500 m,and the stable boundary layer at night is around 1 000 m.The strong radiation on sunny days,rapid surface warming,and strong turbulence are the main factors that form the deep convective boundary layer on sunny days.The dynamic conditions of cold advection in large-scale weather systems,as well as the weakening of radiation intensity reaching the surface by clouds and dust,are the main factors contributing to the unique atmospheric boundary layer structure of sandstorm weather.