摘要
运用ＭＭ４中尺度动力学模式结合沙尘气溶胶传输模式，模拟分析了１９９２年４月１０日发生的一次沙尘暴天气及沙尘气溶胶（黄沙）输送过程。得出蒙古气旋冷锋后的大风是沙尘扬起的主要动力，地形抬升、白天混合层内的湍流扩散和锋区强烈的上升气流将沙尘输送到高层。沙尘气溶胶的水平输送主要通过对流层下层和上层两层向下游输送。低层沙尘随冷锋一起向下游输送，移速较慢；高层沙尘主要通过西风气流迅速输送到下游区域。
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.
出处
《大气科学》
CSCD
北大核心
1998年第6期905-912,共8页
Chinese Journal of Atmospheric Sciences
基金
国家自然科学基金
所长重点基金项目
