初始扰动对冰雹云发展影响的数值研究

在水平均一的初始场中触发对流的发生可采用热力扰动和强迫抬升两种方法，但扰动的方式、强度和范围的不同对模拟的对流云的发展有着重要的影响。本文利用一次冰雹云发展前期的实测探空资料，对热力扰动的强度、范围进行了数值试验，结果表明：在同样的层结条件下，随着扰动强度、厚度的增加，所模拟的冰雹云的强度也增加，且以湿热泡扰动触发的冰雹云最强，其次是湿泡，而热泡扰动最弱。但无论以何种方式启动，只要模拟的冰雹云的云顶高度相当，云体的宏微观特征差异就不大。

NUMERICAL STUDY ON THE EFFECT OF THE INITIAL DISTURBANCE ON THE DEVELOPMENT OF HAILSTORM CLOUD

Thermal disturbance and forced uplifting are two methods to initiate a cumulus convection in the horizontal homogeneous initial fields. The effect of initial disturbance onthe development of hailstorm cloud is studied in this paper. The result shows that the morestrong the initial disturbance is,the more intensely the hailstorm cloud develops. The resultalso shows that if the heights of the modeled hailstorm cloud'S top are equal to each other,their dynamical and micro structures would be alike.