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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Subglacial Lake Whillans - Ice-penetrating radar and GPS observations of a shallow active reservoir beneath a West Antarctic ice stream
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Subglacial Lake Whillans - Ice-penetrating radar and GPS observations of a shallow active reservoir beneath a West Antarctic ice stream

机译：冰川下的Whillans湖-在南极西部冰流之下的一个浅水活跃储层的透冰雷达和GPS观测

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摘要

Ice-penetrating radar and kinematic GPS observations from Subglacial Lake Whillans (SLW), West Antarctica, reveal a shallow lake that is confined by steep basal topographic features. Radar imaging of SLW, although indicating wet basal conditions, is consistent with a water column depth of only ~. 6. m or less during the near low-stand state at the time of the survey. Kinematic GPS profiles reveal that SLW is generally defined by a ~. 15. m surface depression centered at S 84.237° W 153.614°. This point coincides with the area of lowest hydropotential in the lake basin and also the largest surface elevation range in ICESat data. Therefore this location appears to be an opportune site for subglacial access drilling of this active subglacial lake. A distinct basal topographic ridge on the grid south side of the basin is coincident with a strong contrast in relative basal reflectivity (~. 6. dB), which we interpret as the lake boundary. Mapped hydropotential (calculated assuming hydrostatic equilibrium) shows that water enters the lake from the upstream direction and drains downstream. We hypothesize that a lake-level rise of ~. 5. m plus flexural effects is sufficient to overtop a drainage divide. Thus SLW acts as a temporary storage basin for water beneath Whillans Ice Stream.
机译：来自南极西部的西冰河Whillans湖（SLW）的穿透冰雷达和运动学GPS观测揭示了一个浅湖，其被陡峭的基础地形所限制。 SLW的雷达成像虽然指示了潮湿的基础条件，但与水柱深度只有〜一致。进行调查时，在接近低水位的状态下为6. m以下。运动学GPS剖面显示SLW通常由〜定义。 15. m表面凹陷，中心为S 84.237°W 153.614°。这一点与湖盆中最低的水势区域以及ICESat数据中最大的地面高度范围相吻合。因此，该位置似乎是该活跃的冰下湖进行冰下进入钻探的合适地点。盆地南侧网格上明显的基础地形脊与相对基础反射率（〜。6. dB）的强烈反差重合，我们将其解释为湖泊边界。映射的水势（假设静水力平衡计算得出）表明水从上游方向进入湖泊，向下游排放。我们假设〜的湖水位上升。 5. m加上挠曲作用足以使排水沟超过上限。因此，SLW充当了Whillans冰流下方水的临时存储盆地。

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