【摘要】 本文利用河北省1961-2000年68个站点地面气象观测记录中的冻土资料,通过对河北省地面冻结日期、解冻日期、冻结日数及平均最大冻土深度的时空分布特征进行分析,以此来解释冻土对气候变化的响应。结果发现: 近40a来,地面冻结日期呈现略微推迟的态势;地面解冻日期呈明显提前的趋势;地面冻结日数相应减少;累年平均最大冻土深度由北到南逐渐减小;全省历年平均最大冻土深度变化呈减小趋势,各分区的变化趋势与全省的变化趋势基本相同,冀北高原区变化幅度最大。更多还原

【Abstract】 Based on the available observation data from 68 meteorological stations in Hebei Province from 1961to 2000, the climatic change characteristics of dates of frozen soil, of thaw soil, days of frozen soil and average maxmal depth of frozen soil in this area have been analyzed. The results showed that the trend of change of the dates of frozen soil is slightly defered in the Hebei Province, and the trend of change of the dates of thaw soil is earlier. The days of frozen soil are reduced. The maxmal depths of fro-zen soil are decreased from north to south. In the different area, the trends of change are similar, but the degree of charging is maximum in the north altiplano.更多还原