西藏高原汛期降水类型的研究

利用西藏高原２６个测站２６年（１９７３￣１９９８年）汛期（５￣９月）降水量资料，采用主成分分析和旋转主成分分析方法，对高原汛期降水空间分布型进行了分析。结果表明，主成分分解得到的降水空间分布形式较为集中，前３个特征向量场的分布型具有十分明确的物理意义，可表示降水场部方差的６３．１４％。旋转主成分分解生前６个载荷向量的累积方差贡献达７６．６７％，可较好反映西藏高原汛期降水６个异常敏感区：东南部、东北

Analysis of Rainfall Patterns during Rainy Season over the Tibetan Plateau

With Principal Component (PC) and Rotated Principal Component (RPC) analysis,the spatial anomaly characteristics of flood season rainfall over the Tibetan Plateau were studied by using 26 observational stations precipitation data of rainy season (from May to September) over the Tibetan Plateau from 1973 to 1998.Results show that the first three loading vector field could reflect the whole wet season anomaly structures of rainfall over the Plateau,for example,wet (dry) in all area pattern, wet (dry) in north and dry (wet) in south pattern, wet (dry) in west and dry (wet) in east pattern.The first six rotated loading vector field represent six principal anomaly regions:Southeast part, northeast part, midwest region of Naqu, Yalu Zangbu River basin, the margin zone of south Plateau and northwest part.