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For the first time we investigate the basal thermal condition in the upper area of Jima Yangzong Glacier, the headstream of Yarlung Zangbo River, using ground-penetrating radar techniques. With common offset and common mid-point surveys we analyze the radar velocities in ice with respect to cold-temperate ice transition surface(0.1751 ± 0.0028 m ns~(-1)) and ice-bedrock interface(0.1657 ± 0.0033 m ns~(-1)), indicating a radar velocity of 0.1410 ± 0.0154 m ns~(-1) for the temperate ice layer(16.6 ± 1.8 m). We estimate that the temperate ice layer has a water content of around 6 % ± 4 %, suggesting that the Jima Yangzong Glacier, previously known as continental-type, now possibly becomes polythermal.
With the first time we investigate the basal thermal condition in the upper area of Jima Yangzong Glacier, the headstream of Yarlung Zangbo River, using ground-penetrating radar techniques. With common offset and common mid-point surveys we analyze the radar velocities in ice with respect to cold-temperate ice transition surface (0.1751 ± 0.0028 m ns -1) and ice-bedrock interface (0.1657 ± 0.0033 m ns -1), indicating a radar velocity of 0.1410 ± 0.0154 m ns ~ ( -1) for the temperate ice layer (16.6 ± 1.8 m). We estimate that the temperate ice layer has a water content of around 6% ± 4%, suggesting that the Jima Yangzong Glacier, previously known as continental-type, now becomes polythermal.