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首页> 外文期刊>Geophysical Research Letters >Leveraging the Rapid Retreat of the Amundsen Gulf Ice Stream 13,000 Years Ago to Reveal Insight Into North American Deglaciation
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Leveraging the Rapid Retreat of the Amundsen Gulf Ice Stream 13,000 Years Ago to Reveal Insight Into North American Deglaciation

机译：13,000年前，利用Amundsen Gulf Ice Stream的迅速撤退，揭示对北美谴责的洞察力

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摘要

We examine the influence of different deglacial histories of the North American ice saddle, which connected the Cordilleran ice sheet and western Laurentide ice sheet, on the stability of the fast-flowing Amundsen Gulf Ice Stream, located in the northwestern Laurentide ice sheet. We use a simplified marine-terminating ice stream model to simulate grounding line retreat and compare our predictions to geologic evidence for the rapid collapse of the Amundsen Gulf Ice Stream at 13 ka. We show that observations of ice stream retreat can be used to distinguish between past ice unloading histories, and that the rapid retreat of the Amundsen Gulf Ice Stream near 13 ka is most dynamically consistent with substantial deglaciation of the North American ice saddle from 13 to 11.5 ka, during the Younger Dryas cooling episode. These results suggest that short-lived changes in ice stream behavior may be used to reveal larger-scale and longer-duration ice sheet dynamics.
机译：我们研究了北美冰鞍的不同夜光历史的影响，该北美冰骑兵与西部劳伦德冰盖上的北美冰盖冰盖的稳定性，位于洛塞德冰床西北部的快速流动的Amundsen海湾冰流。 我们使用简化的海洋终端冰流模型来模拟接地线退行，并将我们的预测与13 ka的Amundsen海湾冰流快速崩溃的地质证据进行比较。 我们表明，冰流撤退的观察可用于区分过去的冰卸座历史，而Amundsen海湾冰流的快速撤退近13 kA最多是动态的一致，北美冰鞍从13到11.5的大量下降 KA，在较年轻的Dryas冷却发作期间。 这些结果表明，冰流行为的短暂变化可用于揭示大规模和更长持续时间的冰片动态。

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