冰雹是影响我国的高影响天气，同时作为固态的降水，冰雹是全球水循环的一部分。在全球降水形势变化多端的气候背景下，了解我国冰雹频率和强度的气候特征及其变化机制对人们了解冰雹乃至极端降水的变化都有重要的科学意义。但是过去受到冰雹观测条件的限制，人们对冰雹发生频率以及代表其强度的尺度的长期变化规律认识有限。本项目将以中国历史观测的冰雹频率和强度资料为基础，配合卫星反演分析和高分辨率数值模式模拟诊断方法，研究1960年到现在冰雹发生频率和强度的气候特征和长期演变规律，建立不同环流天气型背景下影响冰雹频率与强度变化的物理模型，揭示我国冰雹形成和演变的物理机制，探索气候变化背景下我国未来冰雹频率和强度的可能变化趋势，为我国防灾减灾策略的制定提供重要的科学理论依据。

As solid precipitation, hail is a kind of high-impact weather in China and also play an important role in the hydrologic cycle in the world. Because recent observation show an increasing of extreme precipitation events under the global warming, the study of the climatology of hail and its long term trend will help us to understand the change of extreme precipitation. Hail frequency and intensity is poorly known in the past due to the limit of hail observation system in China. This project will provide new insight to hail climatology and its long term trend from 1960 to now, using the historical surface record, satellite observation and simulation with high-resolution mesoscale model. We plan to describe the detail climatology of hail frequency and intensity, try to understand how and why they change with the changing environment, and finally, to project their change in the future. This research will provide theoretical clue to the decision maker to prevent disaster of China in the future.