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根据甘肃河西1958-2003年17个气象站的土壤冻结上、下限记录和最长连续冻结的初、终日资料,采用小波分析方法研究了甘肃河西季节冻结的年代际变化特征.结果表明:甘肃河西最大冻土冻结深度的变化存在8~10a的周期振荡,20世纪80年代中期是其变化的转折期,反映了甘肃河西冬季气候自80年代中期以来变暖的事实.气候成因分析说明,气候变暖对河西季节冻结影响显著.冬季最低气温与甘肃河西季节冻结深度和冻结时间关系密切,特别是冬季地气温差和气温日较差与其关系尤为密切.
According to the initial and final data of the upper and lower freezing records and the longest continuous freezing of 17 meteorological stations in Hexi from 1958 to 2003 in Gansu, the interdecadal variation characteristics of seasonal freezing in Hexi Gansu were studied by wavelet analysis. The results showed that: The maximum permafrost depth varies from 8 to 10a, and the mid-1980s is the turning point of the change, reflecting the fact that the winter climate in Hexi, Gansu has warmed since the mid-1980s. The analysis of climate causes shows that climate change The influence of warm on Hexi season freezing is remarkable, and the minimum winter air temperature is closely related to the season freezing depth and freezing time in Hexi, Gansu Province, especially the winter air temperature difference and the temperature day difference are closely related.