Ice sheet behavior is strongly influenced by the bed topography. However, the effect of the progressive temporal evolution of Antarctica's subglacial landscape on the sensitivity of the Antarctic Ice Sheet (AIS) to climatic and oceanic change has yet to be fully quantified. Here we investigate the evolving sensitivity of the AIS using a series of data‐constrained reconstructions of Antarctic paleotopography since glacial inception at the Eocene‐Oligocene transition. We use a numerical ice sheet model to subject the AIS to schematic climate and ocean warming experiments and find that bed topographic evolution causes a doubling in ice volume loss and equivalent global sea level rise. Glacial erosion is primarily responsible for enhanced ice sheet retreat via the development of increasingly low‐lying and reverse sloping beds over time, particularly within near‐coastal subglacial basins. We conclude that AIS sensitivity to climate and ocean forcing has been substantially amplified by long‐term landscape evolution.

中文翻译：

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床形演化驱动的南极冰盖脆弱性长期增加

冰盖的行为受床形的强烈影响。然而，南极冰下景观的逐步时间演变对南极冰盖（AIS）对气候和海洋变化的敏感性的影响尚未完全量化。在这里，我们从始新世-渐新世转变以来的冰期开始，使用一系列数据受限的南极古地形重建研究了AIS的演化敏感性。我们使用数值冰盖模型对AIS进行了示意性的气候和海洋变暖实验，结果发现床的地形演变导致冰量损失增加了一倍，全球海平面相应上升。随着时间的推移，冰层的退缩和低坡地层的形成越来越多，冰川侵蚀的主要原因是冰川退缩，特别是在近沿海冰河盆地内。我们得出结论，长期景观演变大大增强了AIS对气候和海洋强迫的敏感性。