酒泉市50a气候变化特征及突变分析

Characteristics and Abrupt Analysis of Climate Changes During Last 50 Years in Jiuquan City

利用酒泉市所属6个站点1959—2008年的气温和降水资料,采用滑动平均、趋势分析和Mann-Kendall等方法,分析该地区的气候变化的特征.结果表明:在全球变暖背景下,酒泉市的气温突变明显,而降水突变不明显.50a中,酒泉市年平均气温和各个季节的平均气温呈显著变暖趋势,其中90年代中后期的年平均气温发生了突变,酒泉市东部的突变年份早于西部;酒泉市年降水量呈微弱增长趋势,酒泉市东部的增长幅度略小于西部.这表明,气候突变在酒泉市不同的地区会有不同的体现,突变时间不同步.

Based on the observed data of the temperature and precpitation from 1959 to 2008 in six weather station of Jiuquan City,the main features of climate change and abrupt changes are analyzed with a multiyear trend line,variation curve of five-year running mean,Mann-Kendall abrupt change test.The results indicate that the abrupt change of temperature is more obvious than precipitation under the background of global warming in Jiuquan City.In the past 50 years,annual average temperature and average temperature in each season showed a significant warming trend in Jiuquan City,and the annual average temperature in the late 90＇s is mutated,and the abrupt years in eastern is earlier than in western of JiuQuan.The annual precipitation showed weak growth trend in Jiuquan City,and the growth of eastern is slightly smaller than the west.This shows that the abrupt change of climate in different areas of Jiuquan have different expressions and mutation time.