宁夏引黄灌区气候变化特征分析

以8个气象站1955~2003年的气象观测数据为基础,研究该时段内宁夏引黄灌区的气候变化趋势,利用Mann-Kendall突变检验法,分析了灌区气候变化的阶段性和突变性特点.结果表明:从20世纪80年代中期开始,灌区经历了一个缓慢的增温过程,尤其是冬季平均气温发生显著突变;蒸发量从1955年开始出现了持续稳定的降低,且近3 a减少趋势明显;降水量变化呈现出先降后升的现象;ET0在1990年左右出现了明显的升高趋势.

The Characteristics Analysis of Climatic Change in Yellow River Irrigation Area of Ningxia Region

Taking the meteorological observation data of eight weather stations from 1955 to 2003 as a foundation,the trends and jumps of temperature are studied, Using the Mann-Kendall sudden change inspection method,the marquis changed gradualness and sudden change characteristic are analyzed.The result shows that,At the begin of the 80's intermediate stages,Yellow River irrigation area of Ningxia region has experienced a process of slow and stable warming,it is extremely remarkable that the average temperature in the winter has the sudden change in particular;The evaporation started from 1955 to appear has continued and stable depression,and the reduced tendency is obvious in the nearly three years;The precipitation of the irrigation area has changed from fall to rise;The ET0 has the obvious ascension tendency in 1990.