近40年我国降水量年际变化的区域性特征

REGIONAL FEATURES OF INTERANNUAL VARIATION OF RAINFALL OVER CHINA OVER THE PAST 4 DECADES

应用方差极大准则下的正文旋转因子分析，对我国近４０年标准化年降水量场序列进行客观区划。结果表明，全国降水量场可明显划分成十大区域，它们各自具有不同的旱涝变化特征。例如，华北区和黄河中上游区变干趋势最为显著；西北地区和淮河、长江中上游地区略有变湿；而长江中下游、东北及珠江流域、华南沿海地区长期趋势呈波动变化．８０年代年降水量略低于５ｏ年代。

The analysis of orthogonal rotational factor tinder maximum variance is made ofthe standardised annual rainfall series of China over the past 40 years for objective demarca-tion of regions. Results show that 10 regions can be found.each marked by a dryness/wetnesstrend typical of its own. For example,the drying treidis most noticeable in North China andthe mid to upper reaches of the Huanghe,some degree of wetting is found in NW China,theHuaihe and the mid to upper catchment of the Changjiang and.vibration occurs in the long-term trend of the mid-lower Changjiang. NE China, the Zhujiang basin and S China coastalareas.The rainfall in 1980s is a bit less than that of 1950s.