吉林省旬降水量的客观分级方法探讨  

Discussion on the Objective Classification Method for Ten-day Rainfall of Jilin Province

作　　者：陈长胜[1] 王慧敏[2] 慕秀香[1] 汪秀清[1] 

机构地区：[1]吉林省气象台,长春130062 [2]黄淮学院数学系

出　　处：《气象》2007年第11期87-92,共6页Meteorological Monthly

摘　　要：根据吉林省现行旬降水量等级划分标准和办法,提出了一种基于降水概率分布函数的客观划分办法。该方法引入Z指数变换,将偏态分布的旬降水量序列转换为近于正态分布的Z序列,通过对Z指数的划分反算而得实际降水量的划分结果。该方法既考虑其自身概率分布,又避免了复杂的分布函数参数计算。将该方法的客观标准与现行标准的划分结果进行比较分析,发现前者结果稳定,随机性小,结果更为合理。Based on the current standard and method to classify the ten-day rainfall of Jilin Province at present, a new method, which is based on the probability distribution function, is presented. In view of the non-normal distribution of ten-day rainfall, Z index transformation is employed. The index can transform the non-normal distribution data into the normal one. The classification result of rainfall is based on classifying the Z index. The results of the new method are more stable and more rational than those of the original method.

关 键 词：旬降水量 客观分级 正态分布 Z指数 

分 类 号：S511.1[农业科学—作物学]