中文摘要：

microphysical 三层的模型为层状阴郁在西北中国的一个 midlatitude 地点被在在空中的粒子测量系统公司(下午) ，雷达大小，和 NCAR/Penn 说的 situ 联合调查 Mesoscale 模型版本 5 (MM5 ) 有一个二时刻的微视物理学计划的模拟。测量 supercooled 液体水和小冰粒子的共存在第二层在云顶下面生产雪粒子。山峰数字集中和云水和雨点的吝啬的直径出现在第三温暖的层。就在融化的层下面的薄干燥的层也被观察。预言的降水被公平威胁分数测试。融化的层清楚地在雷达图象被定义，模型雷达反射率输出是对观察的同意。模型结果在 Yanan 车站为三层的模型的每层提供 microphysical 结构的特征。为观察和模型模拟，三层的模型完全并且包括地解释层状的降水形成。

英文摘要：

The microphysical ＂three-layer＂ model for stratiform clouds over a midlatitude location in Northwest China is investigated by combining in situ airborne Particle Measuring Systems, Inc. （PMS）, radar measurements, and the NCAR/Penn State Mesoscale Model Version 5 （MM5） simulation with a two-moment microphysics scheme. The coexistence of measured supercooled liquid water and small ice particles produces snow particles below the cloud top in the second layer. Peak number concentration and mean diameter of cloud water and raindrop appear in the third warm layer. A thin dry layer just below the melting layer is also observed. The predicted precipitation is tested by equitable threat score. The melting layer is clearly defined in the radar image and model radar reflectivity output is agreement with the observations. The model results provide features of the microphysical structure for every layer of ＂three-layer＂ model at Yan＇an station. For both observation and model simulation, the ＂three-layer＂ model explains the stratiform precipitation formation completely and comprehensively.