Impacts of degrading permafrost on streamflow in the source area of Yellow River on the Qinghai-Tibet Plateau,China  

作　　者：MA Qiang JIN Hui-Jun Victor F.BENSE LUO Dong-Liang Sergey S.MARCHENKO Stuart A.HARRIS LAN Yong-Chao 

机构地区：[1]State Key Laboratory of Frozen Soils Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou,730000,China [2]College of Resources and Environment,University of Chinese Academy of Sciences,Beijing,100049,China [3]School of Civil Engineering,Harbin Institute of Technology,Harbin,150090,China [4]Hydrology and Quantitative Water Management Group,Department of Environmental Sciences,Wageningen University,Wageningen,6708PB,the Netherlands [5]Geophysical Institute(GIPL),University of Alaska Fairbanks,Fairbanks,99775,USA [6]Department of Geography,University of Calgary,Calgary,T3A 1E4,Canada

出　　处：《Advances in Climate Change Research》2019年第4期225-239,共15页气候变化研究进展（英文版）

基　　金：the Chinese Academy of Sciences Strategic Priority Research Program(XDA20100103);Ministry of Science and Technology of China Key R&D Program(2017YFC0405704);CAS Overseas Professorships of Victor F Bense and Sergey S Marchenko at the former Cold and Arid Regions Environmental and Engineering Research Institute(now renamed to Northwest Institute of Eco-Environment and Resources),CAS during 2013-2016.

摘　　要：Many observations in and model simulations for northern basins have confirmed an increased streamflow from degrading permafrost,while the streamflow has declined in the source area of the Yellow River(SAYR,above the Tanag hydrological station)on the northeastern Qinghai-Tibet Plateau,West China.How and to what extent does the degrading permafrost change the flow in the SAYR?According to seasonal regimes of hydrological processes,the SAYR is divided intofour sub-basins with varied permafrost extents to detect impacts of permafrost degradation on the Yellow River streamflow.Results show that permafrost degradation may have released appreciable meltwater for recharging groundwater.The potential release rate of ground-ice melt-water in the Sub-basin 1(the headwater area of the Yellow River(HAYR),above the Huangheyan hydrological station)is the highest(5.6 mm per year),contributing to 14.4%of the annual Yellow River streamflow at Huangheyan.Seasonal/intra-and annual shifts of streamflow,a possible signal for the marked alteration of hydrological processes by permafrost degradation,is observed in the HAYR,but the shifts are minor in other sub-basins in the SAYR.Improved hydraulic connectivity is expected to occur during and after certain degrees of permafrost degradation.Direct impacts of permafrost degradation on the annual Yellow River streamflow in the SAYR at Tanag,i.e.,from the meltwater of ground-ice,is estimated at 4.9%that of the annual Yellow River discharge at Tanag,yet with a high uncertainty,due to neglecting of the improved hydraulic connections from permafrost degradation and the flow generation conditions for the ground-ice meltwater.Enhanced evapotranspiration,substantial weakening of the Southwest China Autumn Rain,and anthropogenic disturbances may largely account for the declined streamflow in the SAYR.

关 键 词：Streamflow Warming climate Permafrost degradation Streamflow patterns Source area of Yellow River(SAYR) 

分 类 号：P64[天文地球—地质矿产勘探]