中文摘要：

在 CloudSat 上介绍雷达(CPR ) 的云是明确地奉献遮蔽察觉的一个活跃传感器。比作被动遥远的传感器， CPR 在调查多层的云的出现并且描绘云的内部垂直结构起一个唯一的作用。由于从地面喧嚷的污染，然而， CPR 反射率信号是无效的在最低在表面上面的 1 km，导致温暖的云的众多的错过的察觉。在这学习，由使用 1 年的 CPR 和 MODIS (中等分辨率成像分光辐射函数) 同步数据，被 MODIS 作为多云识别的那些错过 CPR 的海洋的温暖的云被检验。CPR 严重地低估海洋的温暖的云的出现，这被表明，与大约 0.43 的全球一般水准的失误率。在热带、副热带的海洋上，错过 CPR 的云趋于与相对低的海表面温度发生在区域。有云顶的几乎所有温暖的云比 1 km，和失误与增加评估还原剂的降低的 CPR 失误遮蔽顶。至于有比 2 km 高的云顶的云，捕获 CPR 的温暖的云出现的否定偏爱低于 3% 掉落。从 0.6 ～ 1.2 km 的错过 CPR 的温暖的云范围的云顶高度，和这些云主要有显然小的光深度和微滴有效半径。错过 CPR 的温暖的云的垂直地综合的云液体水内容比 50 g m ² 小。CPR 错过有小光深度或小微滴尺寸的一些温暖的云，这也被揭示，除在在由于地面喧嚷的大约 1 km 下面的边界层限制的那些以外。

英文摘要：

The Cloud Profiling Radar （CPR） onboard CloudSat is an active sensor specifically dedicated to cloud detection. Compared to passive remote sensors, CPR plays a unique role in investigating the occurrence of multi-layer clouds and depicting the internal vertical structure of clouds. However, owing to contamination from ground clutter, CPR reflectivity signals are invalid in the lowest 1 km above the surface, leading to numerous missed detections of warm clouds. In this study, by using 1-yr CPR and MODIS （Moderate Resolution Imaging Spectroradiometer） synchronous data, those CPR-missed oceanic warm clouds that are identified as cloudy by MODIS are examined. It is demonstrated that CPR severely underestimates the occurrence of oceanic warm clouds, with a global-average miss rate of about 0.43. Over the tropical and subtropical oceans, the CPR-missed clouds tend to occur in regions with relatively low sea surface temperature. CPR misses almost all warm clouds with cloud tops lower than 1 km, and the miss rate reduces with increasing cloud top. As for clouds with cloud tops higher than 2 kin, the negative bias of CPR-captured warm cloud occurrence falls below 3%. The cloud top height of CPR-missed warm clouds ranges from 0.6 to 1.2 kin, and these clouds mostly have evidently small optical depths and droplet effective radii. The vertically integrated cloud liquid water content of CPR-missed warm clouds is smaller than 50 g m 2 It is also revealed that CPR misses some warm clouds that have small optical depths or small droplet sizes, besides those limited in the boundary layer below about 1 km due to ground clutter.