云南降水正态分布特征的初探

利用适合性检验方法，对云南省125个测站1961年一2000年40a逐月降水资料是否符合正态分布进行了检验，并对云南降水正态分布做了区划。研究结果表明，云南在雨季(5—10月)通过显著性检验的测站数明显少于干季(11一次年4月)通过显著性检验的测站数，其中8月份仅4站次通过显著性检验，而12月份高达97站次，占全省总站次的77．6％；即云南雨季降水多符合正态分布，而在于季多符合非正态分布，8月份几乎全省符合正态分布，而12月份大部份测站都不符合正态分布。云南降水量的正态统计分布一方面具有一定的区域性特征，另一方面又具有较强的局地性，不同的月份同一测站降水量的正态性不同。因此，在做有关降水量的分析预报时，很有必要考虑其正态性的统计分布特征。

THE RESEARCH OF NORMAL DISTRIBUTION CHARACTERISTICS OF THE PRECIPITATION IN YUNNAN PROVINCE

We applied the fitting test method to research on the normal distribution characteristics of the precipitation in Yunnan province with 125 stations rainfall data from 1961 to 2000 month by month,and divide the Yunnan's precipitation normal distribution into three main regions.The results indicated that there is abviously less stations passed significance test in rainy season in Yunnan (from May to October) than in dry season (from November to April in next year).There are only four stations passed significance test on August,while there are 97 stations passed significance on December and it is 77.6 percent of the whole province.It means that the most of Yunnan's precipitation in rainy season belong to normal distribution,on the contrary,the most of Yunnan's precipitation in dry season do not belong to normal distribution.At the same time,the Yunnan's precipitation normal distribution has some regional features and local ones.The different month in same station has different normal distribution characteristics.So it is very important to consider the normal distribution characteristics when we make the forecast of precipitation in Yunnan province.