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首页> 外文期刊>Journal of Glaciology >Weak bed control of the eastern shear margin of Thwaites Glacier, West Antarctica
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Weak bed control of the eastern shear margin of Thwaites Glacier, West Antarctica

机译：西南极洲Thwaites冰川东切变边缘的弱层控制

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摘要

Recent acceleration and thinning of Thwaites Glacier, West Antarctica, motivates investigation of the controls upon, and stability of, its present ice-flow pattern. Its eastern shear margin separates Thwaites Glacier from slower-flowing ice and the southern tributaries of Pine Island Glacier. Troughs in Thwaites Glacier's bed topography bound nearly all of its tributaries, except along this eastern shear margin, which has no clear relationship with regional bed topography along most of its length. Here we use airborne ice-penetrating radar data from the Airborne Geophysical Survey of the Amundsen Sea Embayment, Antarctica (AGASEA) to investigate the nature of the bed across this margin. Radar data reveal slightly higher and rougher bed topography on the slower-flowing side of the margin, along with lower bed reflectivity. However, the change in bed reflectivity across the margin is partially explained by a change in bed roughness. From these observations, we infer that the position of the eastern shear margin is not strongly controlled by local bed topography or other bed properties. Given the potential for future increases in ice flux farther downstream, the eastern shear margin may be vulnerable to migration. However, there is no evidence that this margin is migrating presently, despite ongoing changes farther downstream.
机译：西南极洲Thwaites冰川最近的加速和变薄，促使人们对其目前的冰流模式进行控制和保持稳定性。它的东部切缘将Thwaites冰川与流动较慢的冰和Pine Island Glacier的南部支流隔开。 Thwaites冰川的河床地貌槽几乎限制了它的所有支流，除了这个东部切变边缘，它在大部分长度上都与区域河床地貌没有明确的关系。在这里，我们使用来自南极洲阿蒙森海堤的机载地球物理勘测的机载冰穿透雷达数据（AGASEA）来调查该边缘的床层性质。雷达数据显示，在边界流动较慢的一侧，床层的地形略高一些，而床层的反射率较低，因此地形较粗糙。但是，床边缘上床反射率的变化部分由床粗糙度的变化来解释。从这些观察结果，我们可以推断出，东部剪切裕度的位置不受局部地层地形或其他地层性质的强烈控制。考虑到未来可能进一步向下游增加冰通量，东部切变边缘可能很容易迁移。但是，没有证据表明，尽管下游有进一步的变化，但这一边际目前正在迁移。

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