层状云的雨滴谱分档数值模拟研究

The Raindrop Category Model Study on Raindrop Distribution of Stratiform Clouds

通过建立雨滴分档模式，结合部分观测资料，对中国北方常见的三类典型层状云系：强锋面抬升层状云系、气旋尺度辐合层状云系及弱锋面抬升层状云系的云中水成物总比含水量、降水强度及地面雨滴谱进行了数值模拟，并与观测值进行了比较分析。结果表明，雨滴分档模式较一般使用的单参数 Ｍａｒｓｈａｌｌ － Ｐａｌｍｅｒ（ Ｍ － Ｐ） 分布的参数化模式更能反映雨滴的自然演变特征。

Based on raindrop category model and compared with observation, the precipitation intensity and raindrop spectrum are analyzed for three typical stratiform clouds: stratiform cloud system formed by strong front, cyclonic scale convergence and weak front system in the northern China. The results show that raindrop category model performs well in describing raindrop spectrum and precipitation intensity of stratiform cloud compared with Marshall-Palmer distribution in parameterization model, specially for clouds formed by strong and weak front system.