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permafrost region of northeast China
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permafrost region of northeast China
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中国的冻土
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permafrost region of northeast China
东北多年冻土区
位于欧亚大陆多年冻土区的南缘地带,面积约39万平方千米,介于北纬46°30′~53°30′,海拔几百米至1000米上下。冻土年均温度(指地温年变化层底部的温度)大多在-1.5~0℃,最低-4.2℃;地温年变化深度12~16米。冻土厚度亦随纬度降低而减小,大多在50米以下,最厚达百米。
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