河西走廊东部近52年热量资源变化特征

Variation Characteristics of Thermal Resources in East Hexi Corridor in Recent 50 Years

[目的]研究气候变暖背景下河西走廊东部热量资源的变化特征。[方法]利用1959～2010年河西走廊东部5个气象站日平均气温资料,得出各年代稳定通过10、0℃积温及其持续天数和起止日期分布的变化,进而分析了气候变暖背景下河西走廊东部热量资源的变化特征。[结果]河西走廊东部气温持续增暖,线性趋势达0.34℃/10a,较我国大部分地区更为显著,且与各热量资源指标有较好的相关性。气候变暖使得河西走廊东部稳定通过10、0℃积温显著升高,且稳定通过10、0℃积温的起始日期提前、终止日期延后,使得稳定通过10、0℃积温的持续天数显著增加,特别是0℃积温终止日期延后比起始日期提前更显著。[结论]河西走廊东部热量资源的增加有利于当地粮食产量的稳定提高。

[Objective] The aim was to study variation characteristics of thermal resources in east Hexi Corridor in recent 50 years.[Method] Using the daily average air temperature data from 5 meteorological stations in east Hexi corridor from 1959 to 2010,the variation of accumulated temperature steadily above 10 ℃ and 0 ℃,lasting days,the beginning and ending date were summarized,and then the variation characteristics of thermal resources under the background of climate warming were analyzed.[Result] The air temperature increased continuously in east Hexi corridor,and the climatic trend rate of the annual average air temperature was 0.34 ℃/10a,more significant than any other region in China.And it was well correlated with the thermal resource indexes such as the accumulated temperature steadily above 10 ℃ and 0 ℃,and their lasting days,and the beginning and ending date.Climate warming had made the accumulated temperature steadily above 10 ℃ and 0 ℃ increased significantly in east Hexi corridor widespread.The accumulated temperature steadily above 10 ℃ and 0 ℃ had increased significantly.The lasting days of accumulated temperature steadily above 10 ℃ and 0 ℃ increased significantly too.The delay of ending days was more significant than the advancing of beginning dates.[Conclusion] These changes in thermal resources were conductive to increase food production and maintain the stability of food production in east Hexi corridor.