绵阳站气温均一化检验及初步分析

为了对绵阳站气温序列进行细致的均一化检验，利用1961-2010年绵阳及周边共14个观测站的年平均气温观测资料，选取了与绵阳站水平距离近、海拔高度差异小、相关性高、气温序列完整并服从正态分布、无明显突变点的4个站点，通过差值法建立被检验序列，再采用标准正态检验方法对其进行均一性检验。结果表明：1961-2010年，绵阳站的年平均气温序列共有1962、1975、1992和2002年4个断点。其中1962年和2002年这2个断点均是由于绵阳站的迁站造成，1975年断点的产生可能是因其附近年份的每日定点观测次数由4次增加到5次，1992年断点则主要是由于该年1、2、3、6月的气温偏低所致。

Homogenization Test and Preliminary Analysis of the Temperature in Mianyang

Based on the method of standard normal homogeneity test （SNHT）, annual average temperature series from 1961 to 2010 of 14 weather stations which are in and around Mianyang are used to test the data homogeneity of Mianyang. In this method, the first step is to create a test sequence by using the checking station （Mianyang） and 4 elected reference stations. These reference stations have the same features, near to the checking station, small alti- tude difference, high correlation, complete and according to the normal distribution, and no apparent mutations. Then the second step is to test the heterogeneity of the sequence which has been created in the previous step with SNHT. The results suggest that during the testing period, the average annual temperature series of Mianyang has four breakpoints. They are 1962, 1975, 1992 and 2002. The breakpoints in 1962 and 2002 are because of the move- ment of Mianyang station. The breakpoint in 1975 may be due to the number of the daily fixed-point observation have been added to five times in the vicinity of the year. And the breakpoint in 1992 is mainly due to the lower tem- perature in January, February, March and June of that year.