青藏高原地表温度对一例高原涡影响的数值模拟

Numerical Simulation of the Effect of Surface Temperature on a Plateau Vortex over the Qinghai-Tibet Plateau

基于FNL再分析资料、FY-2D气象卫星黑体亮温数据以及多源融合降水数据,运用WRF模式模拟了2015年6月9~11日的一次高原涡过程,通过对比控制试验和6组青藏高原地表温度敏感性试验的差异,从高原涡生成位置、结构、强度、移动路径等多个方面研究了地表温度对其的影响,并探讨了相应的物理机制。结果表明:模式能够较好地模拟出高原涡生成、发展和成熟各阶段的位置、结构、移动路径、500 hPa环流形势以及降水情况;青藏高原地表温度对高原涡强度和降水有一定影响,对高原涡生成和移动影响不大;地表温度对高原涡的影响主要是通过改变地表感热通量和地表潜热通量来实现的。

Based on FNL reanalysis data,the blackbody brightness(TBB)data from FY-2D meteorological satellite and multi-source fusion precipitation data,the WRF model was used to simulate a plateau vortex process from June 9 to 11,2015.By comparing the differences between the control experiment and six groups of sensitivity experiments on the surface temperature of the Qinghai-Tibet Plateau,the influence of surface temperature on the generation location,structure,intensity and moving path of plateau vortex was studied,and the corresponding physical mechanism was discussed.The results show that the WRF model could well simulate the location,structure,moving path,circulation situation at 500 hPa height and precipitation at each stage of generation and development of the plateau vortex.The surface temperature of the Qinghai-Tibet Plateau had a certain influence on the intensity and precipitation of the plateau vortex,but had little effect on the generation and eastward movement of the plateau vortex.The influence of surface temperature on the plateau vortex was mainly achieved by affecting the surface sensible heat flux and surface latent heat flux.