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利用甘肃省河东地区55个站30a的主秋期降水量资料进行经验正交展开(EOF)和旋转经验正交展开(REOF),分析其空间分布特征和异常类型;以平凉站为例分析了主秋期降水的时间变化规律和周期性;将河东地区主秋期降水量分为8个气候片。分析表明,河东地区主秋期雨量变化规律较为一致,空间分布不均,具有南多北少和东西多中间少的特点;多雨中心和少雨中心的多年平均值相差近200mm;主秋期降水年际变化较大,容易出现不同程度的旱或涝,并有9a左右的周期;20世纪40、60年代为相对多雨期,50、90年代为相对少雨期,70、80年代与平均值持平。
Empirical Orthogonal Expansion (EOF) and Rotational Empirical Orthogonal Expansion (REOF) were used to analyze the spatial distribution and anomaly types of main stations in 55 stations in eastern Hedong, Gansu Province. Autumn precipitation time variation and periodicity; the main autumn precipitation in Hedong area is divided into eight climate patches. The analysis shows that the variation pattern of main autumn rainfall in Hedong area is consistent and the spatial distribution is uneven, with the features of less south and more north and less in east and west. The difference between years of rainy center and rainy center is almost 200mm; Larger, prone to varying degrees of drought or waterlogging, and a period of about 9a; the 20th century 40,60 period for the relatively rainy period, the 50,90 years for the relatively few rain periods, the 70,80 years and the average flat.