中国暴雨中尺度系统发生与发展的诊断分析和数值模拟(Ⅱ)数值模拟

通过改进的MM4中尺度数值模式，对我国三次典型大暴雨过程的模拟，来探讨暴雨中尺度系统发生与发展的问题。主要结果指出:气旋性涡柱在不稳定暖湿气柱内生成和发展，以及与整个涡柱共存的上升运动的持续加强，对暴雨中尺度系统的发展具有重要的作用；地面热通量，凝结潜热释放对暴雨中尺度系统的发展有决定性的作用；各种不同的物理过程和参数化、青藏高原的构形造成的外强迫影响，以及模式空间分辨率等，对暴雨中尺度系统结构与演变以及降雨量的模拟结果均有重要的作用。

Diagnosis and Numerical Simulation for the Genesis and Development of Mesoscale Systems with Heavy Rainfall Part II: Numerical Simulation

Using a improved model of MM4,the genesis and development of the mesoscalesystems with the heavy rainfall are further discussed based on the three typical heavyrainfall events (81.7,81.8 and 91.7)in China.The principal findings are:It is important to the mesoscale systems that a column of cyclonic vorticity is gener-ated and developed within an unstable and warm air with moist,while a persistently in-tensive ascending motion is maintained with whole vorticity column.The effect of the condensation latent release on the mesoscale systems developmentis significant.The various physical processes,model parameterization,the configulationof the Qinghai-Xizang Plateau forming the external forcing influence and the model spa-tial resolution and so on are all important to the simulative results concerning the struc-ture,evolution and precipitation for the mesoscale systems producing heavy rainfall.