山西地区一次层状云降水过程的微观特征观测分析

针对山西省2010年5月27日一次层状云降水过程，利用机载DMT探头和Parsivel激光降水粒子谱仪进行探测试验，分析了云微物理特征，并对空中和地面雨滴谱进行比较。结果显示：空中云垂直和水平结构分布不均匀，CDP、CIP探测最大粒子浓度分别为165．20、1．08cm^（-3）。地面雨滴微物理量的平均值说明本次降水是典型的层状云降水，雨强主要由雨滴数密度决定，雨滴微物理参量随时间分布不均匀。建立地面雨强，与雷达反射率因子Z、雨水含量W、雨滴数浓度N、Gamma分布的谱参数眠、A的相关关系，Z-I、W-I，相关性很好，N-I、N_0-I、λ-I，相关性较差。地面平均雨滴谱较空中平均雨滴谱窄、谱型陡。结合粒子图像和雨滴特征量分析空中雨滴谱随高度的分布发现，本次降水是冷云和暖云降水共存。

Observation and analysis of microphysical characteristics of stratiform cloud precipitation in Shanxi Province

The cloud microphysical properties of a stratiform cloud in Shanxi on 27 May 2010 were ana- lyzed based on the airbrone DMT probes and Parsivel laser precipitation particle spectrometer. The re- sults showed that the vertical and horizontal structure of clouds was uneven. The maximum concentra- tion values sampled by CDP and CIP were 165.20 cm-3 and 1.08 cm-3 respectively. Average value of microphysical features of surface raindrops indicated that it was a typical stratiform cloud precipitation. Rainfall intensity is mostly decided by raindrop concentration. Temporal distribution of raindrop micro- physical parameters was not even. The correlations between the rainfall intensity （I） and the radar re- flectivity （ Z）, the rainwater content （ W）, the raindrop concentration （ N）, parameter No and parameter A were established. There was a very good correlation between I and Z and W, but N, parameter NO and parameter A were poorly correlated to I. The surface raindrop size distributions were narrower and steep- er than the upper raindrop size distributions. The precipitation was the coexistence of cold cloud and warm cloud precipitation.