【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 region from 1961to 2000,the climatic changecharacteristics of freezing day of soil,thawing days of soil,frozen days of soil and average maxmal depth of frozen soil in this area have been analyzed.It was shown that the trend of change of the freezing day of soil is slightly defer in the Hebei region,and the trend of change of the thawing day of soil is advance.The frozen days of the soil is decrease.The maxmal depths of frozen soil decreased from north to south.The maxmal depth of frozen soil generally decreased in the region,and in different area of this region,the trends of change are similar,but the degree of decrease is maximum in the altiplano of the north.更多还原