山西夏季层积云降水微物理特征分析

A Case Analysis on Microphysical Characteristics of Summer Stratocumulus Cloud Precipitation in Shanxi Province

利用Droplet Measureinent TeehnologY（DMT）资料，分析了山西2008年7月17日降水性层积云的云微物理结构，通过对云中粒子浓度、直径、二维图像以及谱型分布变化，并结合宏观记录特征，详细分析了飞机上升和下降阶段云系的垂直结构特征。结果表明：飞机上升阶段云系为高积云，飞机下降阶段云系为高积云一层积云结构，Cloud Droplet Probe（CDP）和Cloud Imaging Probe（CIP）测得粒子浓度偏大，最大浓度分别为236em。和9．74cm^-3。层积云云中微物理量水平分布特征具有明显的不均匀性。上升阶段降水的雨滴主要是冰粒子融化形成的，冷云过程占主导地位，在0℃层附近存在明显的融化层亮带。下降阶段降水机制为高积云冷云过程和层积云暖云过程相结合。

The cloud microphysical date measured by the airborne DMT probes in a precipitating stratocumulus cloud on July 17,2008 in Shanxi province are analyzed. The cloud microphysical characteristics in vertical direction during both ascent and decline stage are presented through analyzing number concentratio and size distribution of cloud particles. The results show that the cloud is Ac configuration n, mean diameter, shape during ascent stage and Ac-Sc configuration during decline stage. Number concentrations sampled by CDP and CIP are larger and maximum number concentrations are respectively 236cm-3 and 9.74 cm-3. Horizontal variety of stratocumulus cloud microphysical parameter shows obviously inhomogeneous features. During ascent stage, raindrops are mainly from ice particles melting. The cool cloud processes are dominant. The radar echoes exist 0℃ isotherm bright band. During decline stage, combination the cool cloud processes of ahocumulus and the warm cloud processes of stratocumulus are distinct.