Simulation of Influence of Qinghai-Xizang Plateau Uplifting on NW China Arid Climate Forming (II): Changing of atmosphere hydrological cycle and Dynamical and Thermal Effects of Plateau

The study of the influence of the QinghaiXizang Plateau uplifting on the NW China arid climate is benefit to the understanding of the arid climate and environment forming. In this paper, the differences of the atmosphere hydrological cycle of NW China and the dynamical and thermal effects of the Plateau among pre, during and post the QinghaiXizang Plateau uplifting are studied by using some numerical simulations. The results show that before the Plateau uplifting or when it is uplifted to the critical height, the net entering water vapor fluxes of the NW China area from the east, west, south and north boundaries are more than now. And the vorticity of 700 hPa level is greater. The ascending motion over the QinghaiXizang Plateau is weaker than now and the sinking motion over the NW China is also weakened. All of these are benefit to the precipitation of NW China.