Mapping and Analyses of Permafrost Change in the Qinghai Plateau Using GIS
By using a mathematical statistic methods,geographical information system technology,the space-time evolution of permafrost in Qinghai province is analyzed,and some evidence of permafrost degradation is found. The area of seasonal frozen soils and permafrost is rather wide in the province. The monthly variation of seasonal frozen soils is significant. Usually,the thawing process of permafrost is more complicated than its freez-ing process,and has a very close relationship with soil characteristics and topographic factors. In the last 10 years,permafrost is in degradation due to distinct increasing of ground temperature,shortening of freezing period,decreasing of the maximum frozen depth,shrinking of permafrost area,enlarging of seasonal frozen soil area,and arising of permafrost base.
NETL
NSTL
万方数据
维普
