中文摘要：

利用美国NASA Langley研究中心提供的云和地球辐射能量系统（CERES），单个卫星视场大气顶／地面通量和云（SSF）的Aqua卫星2002年7月至2004年6月的云水路径和冰水路径资料，分析中国西北地区降水效率和人工增雨潜力。选取天山、祁连山、南疆沙漠和东南部季风区4片有代表性的地域，按该资料的云分类。分别计算低层云和高层云区域月平均值，结合相应时期和地区的降水量，分析不同云层与月降水量的相关。结果表明，西部干旱区降水与高层云相关较好，而东南部季风区则与低层云相关好。整个西北区以低云的云水路径与降水量相关系数最高，平均砰R^2=0．8459。定义月降水效率为月平均降水强度（mm／h）除以总的云水路径，结果表明。不论低层云或高层云的降水效率都是东南部季风区最大，祁连山区略大于天山区，南疆沙漠最小。其年变化低层云除南疆7月最高外，其余地区8月最高。高层云的降水效率东南部季风区8月最大，其余3片7月最高。取（LWWIWP—C）×LWP作为人工降水最大可能增（减）雨的度量，则4片中祁连山区最大，其次是天山，东南部季风区最小，年平均为负值。人工增雨潜力的年变化表明，高层云的峰值A区和C区在8月，D区则在9月，其余峰值均出现在6或7月。本文重点研究天山、祁连山区地形云人工增雨潜力，为今后人工增雨（雪）。开发山区云水资源提供科学依据。

英文摘要：

By using the cloud liquid water path and cloud ice water path data of CERES/SSF from Aqua provided by NASA Langley research center from July 2002 to June 2004, the precipitation efficiency and latent capacity of artificial precipitation over Northwest China were analyzed. The monsoon regions of southeast part of Northwest China A, the Qilian Mountains B, the Tianshan Mountains C and the deserts of south Xinjiang D have been selected for four representative regions. The regional averages of monthly cloud liquid water path and cloud ice water path divided into lower and upper layers clouds have been evaluated, respectively. The correlations between different clouds and monthly precipitation over region A, B, C, D have been estimated. The results show that the monthly precipitations had close relationship with upper layer clouds over the arid regions （ region B, C, D）, but they were in good correlation with lower layer clouds over the monsoon regions （region A）. The averaged square correlation coefficient between cloud liquid water path of lower layer clouds and precipitations was the maximum of R^2 = 0. 8459 in the whole of Northwest China. The precipitation efficiency was defined as the ratio of monthly averaged precipitation to total cloud liquid water path. Results show that the maximal value of precipitation efficiency of lower and upper layers clouds was located in the region A, it was slight more in the Qilian Mountains than that in the Tianshan Mountains, and it was the minimum in the deserts of south Xinjiang. The annual variations of precipitation efficiency of lower layer clouds presented the maximal value in August except for the region D in July, while that of upper layer clouds presented the maximal value in July except for the region A in August. The latent capacity of artificial precipitation was given as the formula of （ LWP/IWP - C） × LWP as the maximal potential enhancement, it was the maximal in the Qilian Mountains among four regions and the second is in the Tianshan Mountains, and