Numerical Analyses of a Dust Storm and Dust Transportation
一次黄沙输送过程的数值模拟研究

A dust storm occured in April,1992 was simulated using MM4 (NCAR/PSU) combined with an aerosol transportation model. The simulations showed that the strong wind produced by cold front of Mongolian cyclone was the main force for dust-lifting, the dust was transported to the upper layer through the daytime vertical turbulent diffusion in PBL and the upward current in front zone. The horizontal transportation of dust chiefly occurred in two layers, in the lower layer (below 4 km),dust was moved by the cold front, and in the upper layer (above 4 km), the dust was transported in the westerly belt, which was more efficient and faster than that in the lower layer.