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Dynamics of freezing/thawing indices and frozen ground from 1900 to 2017 in the upper brahmaputra river basin, Tibetan Plateau

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Advances in Climate Change Research 2021年第1期12卷 6-17页

作者： LIU Lei LUO Dong-Liang WANG Lei HUANG Ya-Dong CHEN Fang-Fang State Key Laboratory of Frozen Soil Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of Sciences320 Donggang WestRoadLanzhou730000China University of Chinese Academy of Sciences Beijing100049China Institute of Tibetan Plateau Research Chinese Academy of Sciences16 Cuilin RoadChaoyang DistrictBeijing100101China CAS Center for Excellence in Tibetan Plateau Earth Sciences 16 Cuilin RoadChaoyang DistrictBeijing100101China

Dynamics of the frozen ground are key to understand the changes of eco-environment in cold regions,especially for areas with limited field *** this study,we analyzed the spatial and temporal variations of the ground surface freezing and thawing indices from 1900 to 2017 for the upper brahmaputra river(also called the Yarlung Zangbo river in China)basin(UBRB),southwestern Tibetan Plateau,with the air freezing and thawing indices using the University of Delaware(UDEL)monthly gridded air temperature *** abrupt change years for air freezing index(AH)and ground surface freezing index(GH)were detected in 1999 and 2002,respectively,and for both air thawing index(ATI)and ground surface thawing index(GTI)were *** the air temperature rising at a rate of 0.006℃ per year over 1900-2017,the AH and GH decreased at a rate of-0.1℃ d per year,while the ATI and GTI increased at rates of 0.3 and 0.5℃ d per year before the abrupt change year,respectively;all changing trends of freezing/thawing indices increased after the abrupt year,which was-2.9,-0.8,7.3,and 21.7℃ d per year for the AH,GFI,ATI,and GTI,*** utilized the surface frost number model to obtain the dynamics of the frozen ground over the *** the empirical coefficient of E was assigned to 1.2,the simulated frozen ground occupied about 53.2%of the whole UBRB in the 1990s,which agreed well with the existing permafrost map published in *** area of frozen ground accounts for 51.5%-54.5%of the UBRB during *** result may facilitate further studies of the multi-interactions among the frozen ground and relevant eco-environment,such as the air-ground surface energy exchange,hydrological cycles,and changes of the active layer thickness over the UBRB.

关键词： upper brahmaputra river basin Tibetan Plateau Surface frost number model Permafrost distribution Dynamics of frozen ground

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