近55年来敦煌绿洲最高、最低气温的变化特征  

Characteristics of maximum and minimum temperature change in Dunhuang oasis in recent 55 years

作　　者：张克新[1] 刘普幸[1] 霍华丽[1] 张锐[1] 安建科[1] 

机构地区：[1]西北师范大学地理与环境科学学院,兰州730070

出　　处：《干旱区资源与环境》2010年第8期105-110,共6页Journal of Arid Land Resources and Environment

基　　金：甘肃省科技计划基金项目(0803RJZA094);甘肃省教育厅导师项目(0801-11);甘肃省级重点学科自然地理学共同资助

摘　　要：利用敦煌绿洲1951～2005年的逐月平均最高、最低气温资料,采用一元线性回归、Mann-Kendall等方法,对敦煌绿洲的年、季平均最高、最低气温的变化特征进行了分析。结果表明:近55年来,敦煌绿洲年平均最高气温、平均最低气温均呈增暖趋势,但平均最低气温的增暖幅度明显大于平均最高气温的增幅;最低气温的升温速率约为最高气温升温速率的13.24倍,故气温升高受最低气温升高的影响更显著。敦煌绿洲春、秋和冬季平均最高气温均呈上升趋势,夏季平均最高气温略有降低,而四季平均最低气温均呈上升趋势。敦煌绿洲年平均最低气温的增加是突变现象,突变点为1994年。Based on the monthly mean maximum and minimum temperatures data in Dunhuang oasis during 1951 ～2005,the change trend and characteristics of annual,seasonal mean maximum and minimum temperature in Dunhuang oasis were analyzed.The analysis result showed that both maximum and minimum temperatures were increasing for the period.The minimum temperature increased more than maximum temperature and the rate of increase of minimum temperature was 13.24 times higher than that of maximum temperature.So the minimum temperature has been greatly influencing the increasing of the whole temperatures.The mean maximum temperature was increasing in spring,autumn and winter,but it was slightly decreasing in summer in Dunhuang oasis.Anyway,the mean minimum temperature was increasing in all seasons.The increase of the mean minimum tem-peratures was a mutated phenomenon.The mean minimum temperature happened in 1994 in Dunhunag oasis.

关 键 词：最高气温 最低气温 变化特征 敦煌绿洲 

分 类 号：P423[天文地球—大气科学及气象学]