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首页> 外文OA文献 >Airborne radar sounding evidence for deformable sediments and outcropping bedrock beneath Thwaites Glacier, West Antarctica
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Airborne radar sounding evidence for deformable sediments and outcropping bedrock beneath Thwaites Glacier, West Antarctica

机译：机载雷达探测证据表明西极南特威斯冰川下有可变形的沉积物和露出的基岩

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摘要

The geologic and morphologic records of prior ice sheet configurations show evidence of rapid, back-stepping, meltwater intensive retreats. However, the potential for such a retreat in a contemporary glacier depends on the lithology of the current ice sheet bed, which lies beneath kilometers of ice, making its physical properties difficult to constrain. We use radar sounding and marine bathymetry data to compare the bed configuration of Thwaites Glacier to the bed of paleo-Pine Island Glacier. Using observed and modeled radar scattering, we show that the tributaries and upper trunk of Thwaites Glacier are underlain by ice flow-aligned bedforms consistent with deformable sediment and that the lower trunk is grounded on a region of high bed roughness consistent with outcropping bedrock. This is the same configuration as paleo-Pine Island Glacier during its retreat across the inner continental shelf.
机译：先前冰盖构造的地质和形态记录显示出迅速的，后退的，融化水密集型撤退的证据。然而，在当代冰川中进行此类退缩的可能性取决于当前冰盖层的岩性，该冰盖层位于几千米的冰之下，使其物理特性难以约束。我们使用雷达测深和海洋测深数据将Thwaites冰川的床构造与古松岛冰川的床进行比较。使用观察到的和模拟的雷达散射，我们显示，Thwaites冰川的支流和上部树干位于​​与可变形沉积物一致的与冰流对准的地层之下，下部树干则位于与露头基岩一致的高床糙度区域。这与古松岛冰川在内陆大陆架退缩期间的构造相同。

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