Analyzing the upper and lower limits of seasonal frozen ground depth, its main frozen period and ending date from 1958 to 2003 of 17 representative meteorological stations in Hexi Corridor of Gansu Province demonstrates that the change of seasonal maximum frozen ground depth has an 810 a period; There was a shift of the frozen ground depth in the mid 1980s, showing a winter temperature warming in Hexi Corridor of Gansu Province since the mid 1980s. The minimum air temperature in winter controls the seasonal...
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