非均匀下垫面局地气候效应的数值模拟

Numerical Simulation of Local Climatic Effect ofHeterogeneous Underlying Surface

使用美国NCAR非静力平衡模式MM 5V3,模拟了黑河地区非均匀下垫面局地小气候效应 ,再现了山谷风环流及夏季“绿洲效应”、沙漠上的“逆湿”和由于地表热力分布不均匀引起的绿洲—沙漠垂直环流等绿洲—沙漠相互作用的典型特征 ,较全面地揭示了非均匀地表大气边界层内的风、温、湿度场与陆面相互作用的物理机理 。

The local climatic effect of heterogeneous underlying surface was simulated through the MM5V3 meso-scale model. The simulations reappear the some typical characteristics of the oasis-desert interaction such as mountain valley wind, 'oasis effect' in the summer, and 'inverse humidity' on desert and oasis-desert vertical circulation which are caused by the thermodynamic distinctions of different underlying surfaces and reveal the physical mechanicsm of the interaction between the land surface and wind field, temperature and humidity in atmospheric boundary layer over heterogeneous land surface. Namely, the results of the numerical simulations in the paper have well tested the ones in field experiments.