青河1957—2008年积温变化特征分析

Variation Characteristics of Accumulated Temperature during 1957-2008 in Qinghe

对青河1957—2008年积温变化特征进行分析,结果表明:农耕期>0℃正积温以94.0℃/10a的速度在增加,并在20世纪90年代中期开始发生了增加突变。夏日的增加是造成农耕期>0℃正积温增加的最主要原因。冬季<0℃负积温以105.4℃/10a的速度在减少,并在20世纪80年代后期开始发生了减少突变。寒冷日的减少是造成冬季<0℃负积温减少的最主要原因。寒冷日里极度严寒日的减少最为明显,对冬季<0℃负积温减少贡献最大。

The variation characteristics of accumulated temperature during 1957-2008 in Qinghe were analyzed.The results demonstrated that 0 ℃ positive accumulated temperature increased at the rate of 94.0 ℃/10a in farming time,and the abrupt increase came up in the middle of 1990s.The increase of summer days was the main reason for the increase of positive accumulated temperature of 0 ℃ in farming time.In winter,the negative accumulated temperature decreased at the rate of 105.4 ℃/10a,and the abrupt decrease occurred in the late of 1980s.The decrease of cold days in winter caused mainly negative accumulated temperature down.The decrease of extremely cold days in winter was obvious,which contributed most to the decrease of negative accumulated temperature of 0 ℃.