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《Journal of Glaciology and Geocryology》 1982-01
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DISUSSION ON THE FORMATION AND THE TREND OF DEVELOPMENT OF THE PERENNIAL FROST ON SOUTHERN QINGHAI-NORTHERN XIZANG (TIBET) PLATEAU

Fan Ronghe, Yao Shangsen (First Hydrogeological Team, Geological Bureau of Qinghai)  
The perennial frost in the Southern Qinghai-Northern Xizang area belongs to a kind of low to middle latitude and high elevation type. Its formation is the result of numereous factors over a long period. The essential factor is new tectonic movement, and the next is the variation of quaternary climate. Recently preserved perennial frost of this area is formed in the beginning of the early Zhajia-zangbu Glacial epoch of late pleistocene. Afterwards, although the climate returns to warm here as well as over the world, but the variation is not so sensitive as the low latitude area. Simultaneously because of the continuous uplifting of the plateau which may reduce the value of high temperature in interglacial epoch, and then the warm tendency may be relatively decreased. Therefore the perennial frost only varied quantitatively. At late Basge-Cuo glacial epoch of Late Pleistocene, the perennial frost of Southern Qinghai-Northern Tibet plateau possessed larger amplitude of progression Duriug post glacial epoch there were more regressions and progressions of different amplitudes, with traces in the seams of perennial frost. Many Palaeo-periglacial phynomena identified this view point. The result of some natural phynomena and the determination of C14 show that the general trend of perennial frost in the recent ten thousand years is in regression. How is the development in the future ? It is determined by the regularity of the climatic variation. If only the fact of fast uplifting of the plateau is considered, the climate must be more and more dry and cold, and the periglaciation would spread continuously over a wide area. Therefore on the basis of continuous uplifting of plateau, the perennial frost is possible to develope further in the future.
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