利用云廓线雷达数据分析云光谱结构特征

云在地气系统中扮演着非常重要的角色，当前气候模式的模拟仍然缺乏云体内部精细结构的数据。而用传统的被动卫星辐射计遥感，则会丢失大量的云层垂直分布的信息。正是基于这些原因，NASA提出了CloudSat的发射项目，提供必要的观测以使我们更好的理解云的内部结构。CloudSat于2006年4月28日发射成功，搭载第一个W带(94 GHz)云廓线雷达(cloud profile radar, CPR)，可提供连续地、全球时间序列的云的垂直结构和特征。利用CloudSat卫星数据对2009年第8号台风云系“莫拉克”和2009年的第15号台风云系“巨爵”进行分析，根据云检测的结果，获取了雷达反射率、云类型以及云层光学厚度的连续变化特征。这将为我们后续台风云系光学特性的研究提供参考。

Analysis of Cloud Spectral Structure Characteristics Based on Cloud Profile Radar Data

Cloud plays a very important role in the earth-atmosphere system. However, the current climate models are still lacking data about internal fine structure of cloud. And when the traditional passive satellite radiometer is used for remote sense, a plentiful information of the vertical distribution of cloud layer will be lost. For these reasons, NASA proposed the launch project of CloudSat, Whose purpose is to provide the necessary observation, and then allow us to understand better the internal structure of the cloud. CloudSat was successfully launched on April 28, 2006. It carried the first cloud profile radar (CPR) with W band (94 GHz), which can provide continuous and global time sequence vertical structure and characteristics of cloud. In the present paper, using CloudSat satellite data, we analyzed the 8th “Morakot” and 15th “ Koppu” typhoon cloud systems. According to the “typhoon” cloud detection results, the radar reflectivity, cloud types and optical thickness successive variation of cloud layer were gotten, which will provide a reference for studying optical properties of typhoon cloud system.