摘要
利用1957～2008年(共52年)河南省48个气象站月、年降水量资料,利用标准偏态系数和峰度系数检验方法,对降水量的正态性进行了分析。结果表明,河南省大多数气象站的月和年降水量不服从正态分布,但对降水量序列进行开平方或开立方处理后,降水量序列的正态性得到明显的改善。半数台站的年降水量原始序列服从正态分布。对各站偏态系数进行平均,可以发现,所有站月序列的偏态系数均为原序列的最大,立方根序列的偏态系数最小。原序列均为正偏,平方根序列以正偏为主,立方根序列则以负偏为主。所有站月原序列的峰度系数均为正数,平方根或立方根的峰度系数则正负相间。
Based on monthly and annual precipitation at 48 stations from 1957 to 2008 in Henan Province,the normality of the precipitation was analyzed by using the skewness and sharpness coefficient methods. The results show that the monthly and annual precipitation at most of the stations do not obey the normal distribution,however,their square/cube root obey the normal distribution better. For half of the stations,their original series of annual precipitation obey the normal distribution. The biggest skewness coefficient occurs in the original series,and the smallest in the cube root series,which is applicable for all stations and months. The positive bias is found in all the original series and most of the square root series,and the negative bias is found in most of the cube root series. The sharpness coefficients are all positive for the original series,which is positive or negative for square and cube root series.
出处
《气候与环境研究》
CSCD
北大核心
2010年第4期522-528,共7页
Climatic and Environmental Research
基金
国家科技支撑计划课题2007BAC03A01和2007BAC29B02
关键词
河南
降水量
正态性
概率分布
Henan
precipitation
normality
probability distribution
