【摘要】 针对在实际业务预报中经常遇到的北京地区降水的两种特殊性 (明显天气系统移来时 ,北京地区降水明显比周围偏多或偏少 ) ,选取一个实例利用中尺度非静力模式 (MM5)对降水比周围偏多情况进行了高分辨率数值模拟和敏感性试验。结果表明 ,该模式比较成功地模拟了此次天气过程及其相关的中尺度系统的发生发展 ,凝结潜热对天气过程的发生发展有重要作用 ,而地形在天气过程中也起着主要作用 ,低层潜在不稳定能量的储备和输送是暴雨发生不可缺少的条件。更多还原

【Abstract】 A special weather event over Beijing is simulated, and a series of sensitivity experiments are carried out using a nested grid version of PSU/NCAR’s mesoscale model(MM5) with a fine mesh grid size of 15km. It is shown that the MM5 model reproduces successfully the development of the weather process and its relevant mesoscale systems, that latent heat release acts a vital role in the development of the windward waves weather case, that responses to topographic forcing is rather sensitive; and that the store and transportation of the low-level potential unstable energy over Beijing are crucial conditions for the formation and intensification of convection.更多还原