【摘要】 本研究经过对比各种降水非均匀性研究方法后,选择降水集中度作为降水非均匀性研究方法,结合正态分布函数、累积频率和百分位法,确定降水非均匀性等级评价指标,分析了1960-2013年中国降水非均匀性等级时空变化特征,并进行综合评价。研究结果表明:1结合正态分布函数、累积频率和百分位法,确定降水非均匀性等级评价指标,划分为7个等级:高度集中、中度集中、轻度集中、正常、轻度分散、中度分散和高度分散。2近54年来,中国降水年内分配趋于正常或分散的区域有所增加。更多还原

【Abstract】 Through comparisons of various methods, the method of precipitation concentration degree(PCD) was used to study precipitation heterogeneity. In addition to PCD, normal distribution functions, cumulative frequencies, and percentiles were used to establish a graded evaluation index of precipitation heterogeneity. A comprehensive evaluation of precipitation heterogeneity and its spatiotemporal variation in China in 1960- 2013 were analyzed. Results indicated that:(1) seven categories of precipitation heterogeneity could be identified: high centralization, moderate centralization, mild centralization, normal, mild dispersion, moderate dispersion, and high dispersion;(2) during the study period, the precipitation in more parts of China tended to be normal or dispersed, which is beneficial to human activities.更多还原