Abstract:Due to the small spatiotemporal scale and large change rate of turbulence, and the lack of large-scale field observation, there is little research on the characteristics of atmospheric turbulence in China. Since 2011, China has begun to store second level high-resolution soundings data, which makes it possible to deeply study the characteristics of turbulence in various parts of China. When using radiosonde data to diagnose and analyze the characteristics of turbulence, it is necessary to consider the impact of instrument noise on the analysis results. Firstly, this paper analyzes the impact of instrument noise on the analysis results in China, proves that noise will reduce the average turbulent dissipation rate in the troposphere, and proves the necessity of removing noise. On this basis, Thorpe analysis method is used to analyze the relationship between the intensity of turbulence (turbulence dissipation rate) and the type of underlying surface in detail. Results in the troposphere, the annual average grassland turbulence was the strongest, followed by dryland crops, paddy crops, shrubs and wasteland. In the lower stratosphere, it is still affected by the underlying surface, and the annual average turbulence of grassland is still the strongest, followed by dry land crops. The turbulence shows obvious seasonality on different underlying surfaces, and the intensity and frequency of the upper troposphere are the highest in summer. The results of this paper will help to understand the characteristics of turbulence and provide reference information for aircraft flight safety and the improvement of turbulence parameterization scheme.