Simulation Analysis of the Local Land-Atmospheric Coupling under a Tibetan Plateau Vortex using the WRF_LES

     
A series of simulation experiments on the local atmosphere-land coupling characteristics under the Tibetan Plateau vortex weather system using the WRF_LES model has been conducted. The chosen event occurred on July 7, 2017, starting at 02:00 on July 7th with the vortex center located at 33°N, 87°E, and ending at 20:00 on July 8th with the vortex center at 32°N, 103°E. We conducted a control experiment and sensitivity experiments with different initial soil moisture to explore how surface conditions affect the thermal state of the boundary layer and the free atmosphere under the vortex weather system. Based on the control experiment, we investigated the movement path and influence range of the vortex center under the Tibetan Plateau vortex weather system and investigated the local atmosphere-land coupling characteristics in terms of soil moisture distribution affecting surface flux, boundary layer height, wet static energy, lifting condensation level, and LFC in the distances relative to the vortex center. In conjunction with sensitivity experiments, we further explored the influence of soil moisture on the key variables mentioned above, including its possible effects on the intensity and path of the Tibetan Plateau vortex, as well as the corresponding changes in local atmospheric coupling variables. Based on this, we further discussion of the possible processes and mechanisms through which soil moisture influences these variables. This study is not only beneficial for understanding the vertical transport of energy and water vapor on the surface conditions of the Tibetan Plateau vortex weather system but also holds significant importance in comprehending the role of thermodynamics in the development and evolution of the Tibetan Plateau vortex.