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Processes and modes of permafrost degradation on the Qinghai-Tibet Plateau

Science china.Earth sciences 2010年第11期53卷 150-158页

作者： wu jichun,sheng {3.,wu qingbai & WEN Zhi state key laboratory of frozen soil engineering,cold and {13. Regions environmental and engineering research institute,chinese academy of sciences,lanzhou 73.000,china 1. state key laboratory of {3. soil engineering Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 China

Climate warming must lead the mainly air temperature controlled permafrost to *** on the numerical simulation,the process of permafrost degradation can be divided into five stages,i.e.,starting stage,temperature rising stage,zero geothermal gradient stage,talic layers stage,and disappearing stage,according to the shape of ground temperature *** on the Qinghai-Tibet Plateau (QTP) is generally considered a relic from late Pleistocene,and has been degenerating as a whole during *** to spatial-temporal compensation,the present thermal {3. discrepancy of permafrost in different areas on the QTP may correspond with their degradation *** the QTP,permafrost in the high and middle mountains belongs to temperature rising stage,the permafrost thermal {3. is transiting from late rising temperature stage to zero geothermal gradient stage that is distributed in the *** that is in a zero gradient stage mainly appears in the high plateau and valley,whereas the transition from zero gradient stage to talic layers stage of permafrost is located in the vicinity of the lower limit of permafrost,and permafrost is disappearing from margin of perennially frozen *** are two modes of perennially frozen ground thawing,thawing from top to bottom and thawing from bottom to top *** the temperature rising stage,when the heat flux in the perennially frozen soil layer is less than that in the unfrozen soil underlying frozen soil layer,the geothermal flux is partly used to thaw the base of permafrost,and permafrost thaws from bottom to *** the decrease of thermal gradient in the perennially frozen ground,the heat that is used to thaw permafrost base increases,and geothermal heat will be entirely consumed to thaw the base of permafrost until the temperature gradient reaches zero thermal gradient *** the other hand,the disappearance of permafrost may be delayed by "thermal offset" and "seas

关键词： Qinghai-Tibet Plateau permafrost degradation process degradation stage degradation mode

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Discussion on possibilities of taking ground ice in permafrost as water sources on the Qinghai-Tibet Plateau during climate warming

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research in cold and arid Regions 2009年第4期1卷 322-328页

作者： jichun wu,yu sheng,qingbai wu,{3.,xiumin zhang state key laboratory of frozen soil engineering,cold and arid Regions environmental engineering research institute,chinese academy of sciences,lanzhou,{13.,china. state key laboratory of {3. soil engineering Cold and Arid Regions Environmental Engineering Research Institute Chinese Academy of Sciences cold and arid Regions environmental and {3. research institute Chinese Academy of Sciences

Large amounts of ground ice are born with permafrost on the Qinghai-Tibet *** of permafrost resulted from the climate warming will inevitably lead to melting of ground *** water released from the melting ground ice enters hydrologic cycles at various levels,and changes regional hydrologic regimes to various *** to difficulties in monitoring the perma-frost-degradation-release-water process,direct and reliable evidence is *** accumulative effect of releasing water,however,is remarkable in the macro-scale hydrologic *** the basis of the monitoring results of water-levels changes in some lakes on the Qinghai-Tibet Plateau,and combined with the previous results of the hydrologic changing trends at the regional scale,the authors preliminarily discussed the possibilities of the degrading permafrost on the Qinghai-Tibet Plateau as a potential water source during climate warming.

关键词： climate warming thawing permafrost melting ground ice potential water source

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Modeling Regional and Local-scale Permafrost Distribution in Qinghai-Tibet Plateau Using Equivalent-elevation Method

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chinese Geographical Science 2012年第3期22卷 278-287页

作者： li jing sheng {3. wu jichun WANG Jie zhang Bo YE Baisheng zhang xiumin QIN Xiang state key laboratory of {3. soil engineering Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 China yunnan institute of Water Resources and Hydropower research Kunming 650228 China state key laboratory of Cryospheric Science Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 China Qilian Shan Station of Glaciology and Ecologic Environment State Key Laboratory of Cryospheric Science Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 China

This study proposes an equivalent-elevation method to evaluate the integrated effects of latitude and elevation on regional and local-scale permafrost distribution in the Qinghai-Tibet Plateau,and to model the general permafrost-distribution patterns in regional and local-scale *** is found that the Gaussian curve―an empirical model describing the relation between variations of altitudinal permafrost lower limit (PLL) and latitude in the Northern Hemisphere―could be applied in regional-and local-scale areas in the Qinghai-Tibet Plateau in a latitude-sensitive interval of 3.°-50°*** curve was then used to evaluate the latitudinal effect on permafrost distribution through transforming the latitudinal effect into a kind of altitudinal difference of *** study then calculated the local equivalent-elevation value by overlaying the altitudinal difference of PLL onto real elevation at a certain *** equivalent-elevation method was verified in an experimental subwatershed of the Qinghai-Tibet ***,feasibility of the method should be further tested in order to extend for future *** use of equivalent-elevation values can build a platform for comparing the regional general permafrost distribution in the plateau,and for basing further evaluations of local factors' effects on regional permafrost distribution.

关键词： equivalent-elevation method permafrost distribution permafrost lower limit (PLL) Gaussian curve plat- form function Qinghai-Tibet Plateau

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