【摘要】 本文用二维冰雹云模式，以实际探空资料作为初始场，对风切变在强对流降水中的影响，进行了数值模拟。采用的二维冰雹云模式包括水平动量方程、垂直运动方程、位温方程、气压预报方程和五个云内水物质转化方程，云内微物理过程都采用参数化方法。模拟强对流降水时，在离地1．75km处给一个位温扰动值。并对风切变情况做了三种处理：（1）不考虑风切变，（2）实际风切变，（3）适当强度低层风切变。结果表明，低层风切变能维持强对流云的发展，特别是能延长云体成熟阶段的生命史，并且会增加地面的累积总降水量。更多还原

【Abstract】 Based on a two-dimention hailstorm model, the numerical simulation of wind shear influence on strong convective cloud precipitaion is carried out using real rawinsonde data as input. This model contains horizontal momentun、 potential temperature、 vertical motion and pressure forecasting equations as well as 5 cloud water matter transformation equations. All cloud micro-physics processes are parameterized.A disturbed potenital temperature is given in the height of 1. 75km above ground beforesimulating, Wind shear is considered in three different conditions: (1) ignoring it ; (2)real one; (3)proper one in low atmosphere. The results show that low level wind shear is able to maintain the development of strong convective cloud, especially to extend the lifetime of mature cloud, thus to increase the total accumulative surface precipitation.更多还原