Complex Characteristic of the Upper Permafrost as a Soilgeological Layer(The European North-East of Russia)

摘要

Present-day climate change causing permafrost degradation is most expressed in a zone of discontinuous permafrost with relatively warm temperatures (-1-2℃).Still we observe rather gradual permafrost degradation because of specific structure of upper permafrost layer.Shur(2005)developed the concept of the transient layer,i.e.a layer of ground between soil active layer and permafrost that cycles