摘要
利用1951—2004年共54a宁夏各气象站的年、季、月降水量资料,使用偏度与峰度检验方法和x2检验方法,对降水量分布的正态性进行了分析。结果表明:宁夏大多数气象站的年降水量服从正态分布。夏季18站降水通过正态性检验,秋季12站通过,春季和冬季各有7和4站通过正态性检验。夏、秋季的计算结果普遍比冬、春季更好。不同季节通过正态性检验的气象站地理分布具有明显的区域性特征。针对宁夏月降水总体分析表明,各站均不服从正态性分布。逐月降水检验结果是,9月、8月、10月通过正态性检验的站数最多,11月通过站数最少。六盘山站通过正态性检验的月份最多,全年有10个月的月降水量服从正态分布。另有7站各月降水均不服从正态分布。未能通过正态性检验的降水样本中,偏度系数存在强烈的偏向低值的情况。偏度系数未能达到阈值标准是非正态分布的根本原因。
We have analyzed the annual, seasonal and monthly precipitation data in Ningxia by using normal distribution test of x^2 , skewness and kurtosis methods. Results showed that （1） most of the weather stations in Ningxia passed the normal distribution test for annual precipitation; （2） 18 stations passed the normal distribution test for summer precipitation, 12 stations for autumn precipitation, 7 stations for spring precipitation and 4 stations for winter precipitation. There are obvious geographic differences of the stations that passed the test in different seasons. None of the stations passed the normal distribution test for monthly precipitation totality. The test for every month indicated that in September, August, and October the numbers of stations that passed the test are most, and in November are the least. The skewnesses of the precipitation samples that failed to pass the test are very low, and the skewness couldn＇ t meet the standard of the threshold is just the major reason of abnormal distribution.
出处
《中国沙漠》
CSCD
北大核心
2006年第6期963-968,共6页
Journal of Desert Research
基金
国家科技部项目(2004DIB3J121)资助
关键词
宁夏
降水量
正态性分析
Ningxia
precipitation
normality analysis
