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Rapid Holocene thinning of an East Antarctic outlet glacier driven by marine ice sheet instability

机译:海洋冰盖不稳定性驱动的南极东部出口冰川全新世快速变薄

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摘要

Outlet glaciers grounded on a bed that deepens inland and extends below sea level are potentially vulnerable to ‘marine ice sheet instability'. This instability, which may lead to runaway ice loss, has been simulated in models, but its consequences have not been directly observed in geological records. Here we provide new surface-exposure ages from an outlet of the East Antarctic Ice Sheet that reveal rapid glacier thinning occurred approximately 7,000 years ago, in the absence of large environmental changes. Glacier thinning persisted for more than two and a half centuries, resulting in hundreds of metres of ice loss. Numerical simulations indicate that ice surface drawdown accelerated when the otherwise steadily retreating glacier encountered a bedrock trough. Together, the geological reconstruction and numerical simulations suggest that centennial-scale glacier thinning arose from unstable grounding line retreat. Capturing these instability processes in ice sheet models is important for predicting Antarctica's future contribution to sea level change.
机译:立足于加深内陆并延伸至海平面以下的河床的出口冰川可能容易遭受“海洋冰盖不稳定”的威胁。在模型中模拟了这种不稳定性,可能导致失控的冰块流失,但其后果尚未在地质记录中直接观察到。在这里,我们提供了南极东部冰盖出口的新的地面暴露年龄,该年龄揭示了大约7,000年前发生的冰川快速变薄,而没有发生大的环境变化。冰川变薄持续了两个半多个世纪,导致数百米的冰块流失。数值模拟表明,当本来稳定地后退的冰川遇到基岩谷时,冰面降落加速。一起进行的地质重建和数值模拟表明,百年尺度的冰川变薄是由不稳定的接地线后退引起的。在冰盖模型中捕获这些不稳定过程对于预测南极洲未来对海平面变化的贡献非常重要。

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