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首页> 外文期刊>Geophysical Research Letters >Continued retreat of Thwaites Glacier, West Antarctica, controlled by bed topography and ocean circulation
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Continued retreat of Thwaites Glacier, West Antarctica, controlled by bed topography and ocean circulation

机译：Thwaites冰川的持续撤退，西南极洲，由床上地形和海洋循环控制

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摘要

The Amundsen Sea sector is experiencing the largest mass loss, glacier acceleration, and grounding line retreat in Antarctica. Enhanced intrusion of Circumpolar Deep Water onto the continental shelf has been proposed as the primary forcing mechanism for the retreat. Here we investigate the dynamics and evolution of Thwaites Glacier with a novel, fully coupled, ice-ocean numerical model. We obtain a significantly improved agreement with the observed pattern of glacial retreat using the coupled model. Coupled simulations over the coming decades indicate a continued mass loss at a sustained rate. Uncoupled simulations using a depth-dependent parameterization of sub-ice-shelf melt significantly overestimate the rate of grounding line retreat compared to the coupled model, as the parameterization does not capture the complexity of the ocean circulation associated with the formation of confined cavities during the retreat. Bed topography controls the pattern of grounding line retreat, while oceanic thermal forcing impacts the rate of grounding line retreat. The importance of oceanic forcing increases with time as Thwaites grounding line retreats farther inland.
机译：Amundsen海部门正在经历南极洲的最大的大规模损失，冰川加速和接地线。提出了将Circumpolar深水的侵入到大陆架上，作为撤退的主要迫使机制。在这里，我们调查Thwaites冰川的动态和演变，具有新颖，完全耦合的冰海数量模型。我们利用耦合模型获得了与观察到的冰川撤退模式的协议。未来几十年的耦合模拟表示以持续速度的持续大规模损失。使用亚冰货架的深度依赖性参数化的解耦模拟显着高估了与耦合模型相比的接地线撤退速率，因为参数化不会捕获与在内侧腔内相关的海洋循环的复杂性撤退。床上地形控制接地线撤退的模式，而海洋热迫使会影响接地线撤退的速度。随着地下线撤退进一步的内陆，海洋迫使海洋强迫的重要性随着时间的推移而增加。

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