Abstract: Data from Vaisala RS-92 GPS radiosonde, and observed by aircraft are analyzed to research the feature of one spring stratiform cloud precipitation of 2009 at Zhangjiakou. Analyses of quasi-saturation areas, potential instability districts and the evolution of the wind field show the weather characteristics of this event. The result shows the reason of the water vapor variation through its transportation, total content variation and uneven distribution along the altitude. Furthermore, comparison between the Vaisala RS-92 GPS radiosonde data and the aircraft observed cloud physics data shows they can complement each other.

Key words: GPS radiosonde, aircraft detection, stratiform cloud precipitation, Zhangjiakou

摘要： 利用Vaisala RS-92型GPS探空仪加密探测和飞机云物理探测资料, 对2009年春季张家口地区一次层积云降水过程进行了研究。从准饱和区、位势不稳定区以及风场的演变等方面探讨了降水的宏观天气学特征; 从水汽输送、水汽总含量变化, 各高度水汽分布等方面分析了降水的水汽变化特征。同时, 对GPS探空和飞机探测结果进行了对比分析。

关键词: GPS探空, 飞机探测, 层积云降水, 张家口