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STUDY OF PERMAFROST DEGRADATION IN THE QINGHAI XIZANG PLATEAU

WANG Shaoling (Observation and Research Station of Qinghai Xizang Plateau, LIGG, CAS 730000)  
The climate in the Qinghai Xizang plateau has been becoming warmer since the late 1970's ,that have resulted in a regional permafrost degradation in the plateau.The mean annual ground temperatures rose 0.1~0.5℃,uncoincidently frozen ground and residual thawed layers in the vertical profile have been forming in the fringe,the lower limit of permafrost distribution rose about 40~80 m,and the total area of permafrost has been disminished 10×10 4 km 2.
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