近55年来河西走廊荒漠绿洲区季节开始日及其长短变化特征分析

Analysis of Change Characteristic of Beginning Dates and Average Length of Four Seasons in Hexi Corridor Desert Oasis in Recent 55 Years

利用河西走廊荒漠绿洲区的4个气象站点1955—2009年日平均气温资料,采用5d滑动平均、气候倾向率和滑动t检验等方法,分析其四季开始日及其长度的变化特征。结果表明:近55a来,河西走廊荒漠绿洲区四季开始日主要表现为春、夏和秋季提早,冬季推迟的变化趋势,并以夏季提早最显著。平均四季长短变化特征为:冬季>夏季>春季>秋季。突变分析表明:春季在1969年和2001年发生了突变,夏季在1970年和1998年发生突变,秋季在1985年发生突变,冬季在1987年发生了突变;秋冬季发生突变的时间较春、夏两季较早。显然,秋冬季对气候变化的响应更敏感。

Based on the daily average temperature data of the 4 weather stations of the desert oasis in Hexi Corridor from 1955 to 2009 and using the methods of climate trending rate, 5 days running mean tempera- ture, slide t detected method, the average beginning dates and length of four seasons were analyzed. The re- sults showed that the beginning days of spring, summer and autumn came earlier in the study area in recent 55 years, especially in summer, but winter came later. It was more obvious at the beginning of the 21st century. The characteristics of changes in the average length in four seasons were as the order of winter〉 summer 〉 spring〉autumn. The analysis result of the abrupt change of the beginning days of four seasons indi- cated that spring was in 1969 and 2001, summer was in 1998, autumn was in 1985 , and winter was in 1987. Obviously, the research area had a more significant response to its climate change.