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首页> 外文期刊>Journal of Glaciology >Ice flow velocities over Vostok Subglacial Lake, East Antarctica, determined by 10 years of GNSS observations
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Ice flow velocities over Vostok Subglacial Lake, East Antarctica, determined by 10 years of GNSS observations

机译：南极东部Vostok冰川湖上的冰流速度由GNSS观测10年确定

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摘要

Repeated Global Navigation Satellite Systems (GNSS) observations were carried out at 50 surface markers in the Vostok Subglacial Lake (East Antarctica) region between 2001 and 2011. The horizontal ice flow velocity vectors were derived with accuracies of 1 cma~(-1) and 0.5°, representing the first reliable information on ice flow kinematics in the northern part of the lake. Within the lake area, ice flow velocities do not exceed 2ma~(-1). The ice flow azimuth is southeast in the southern part of the lake and turns gradually to east-northeast in the northern part. In the northern part, as the ice flow enters the lake at the western shore, the velocity decreases towards the central lake axis, then increases slightly past the central axis. In the southern part, a continued acceleration is observed from the central lake axis across the downstream grounding line. Based on the observed flow velocity vectors and ice thickness data, mean surface accumulation rates are inferred for four surface segments between Ridge B and Vostok Subglacial Lake and show a steady increase towards the north.
机译：在2001年至2011年之间，在Vostok冰河湖（南极东部）地区的50个表面标记上进行了全球导航卫星系统（GNSS）的重复观测。得出的水平冰流速度矢量的精度为1 cma〜（-1）， 0.5°，代表该湖北部冰流运动的第一个可靠信息。在湖区内，冰流速度不超过2ma〜（-1）。冰流的方位角在该湖的南部向东南，并在北部逐渐向东北偏东。在北部，当冰流进入西海岸的湖泊时，速度朝着湖的中心轴线减小，然后略微上升超过中心轴线。在南部，从中心湖轴线到下游接地线的加速度持续增加。根据观测到的流速矢量和冰厚数据，可以推断出B脊和沃斯托克冰河湖之间的四个地表部分的平均地表蓄积率，并向北逐渐增加。

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