乌鲁木齐逐月气温资料均一性检验和订正

Homogenization Examination and Corrections of Urumqi Monthly Air Temperature Data

选用1951—2008年乌鲁木齐市气象站逐月最高、最低及平均气温资料,用标准正态检验(SNHT)方法对逐月气温资料序列进行均一性检验,并选用差值法对因迁站引起的断点资料进行订正,检验结果显示,月气温序列断点所在的年份与年序列中检验出的断点基本相对应,即气温资料均在迁站距离较远的1975年产生了断点;各月的检验结果存在一定的差异,5—9月气温较高的月份资料受迁站的影响较大,而且产生了断点,并通过了0.05的显著性水平。用不同的权重比例对月序列进行订正,并选择累积距平方法对5—9月气温序列订正前后的变化趋势作了比较分析,发现订正前后趋势确有较显著的变化。

Monthly maximum, minimum and mean temperature data of Urumqi meteorological station from 1951 to 2008 were tested by using standard normal test （SNHT） method, and the breakpoint because of relocation was corrected using the D-value method. The results revealed that abrupt points in monthly sequences mainly corresponded to those in annual sequences, and those points of the temperature occurred in 1975, when the meteorological station relocated far from the original station. Monthly test results showed that temperature sequences from May to September were more influenced by relocation of the station, and there were some abrupt points at significant level of 0.05. Using the accumulative anomaly method to analyze the change trend of temperature sequences from May to September based on the different weights, it was found that there is a notable change after correction.