Ocean forced variability of Totten Glacier mass loss
Ocean forced variability of Totten Glacier mass loss
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DOI：
10.1144/sp461.6
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发表时间：
2018-01-01
期刊：
影响因子：
--
通讯作者：
Siegert, Martin J.
中科院分区：
文献类型：
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作者：
Roberts, Jason;Galton-Fenzi, Benjamin K.;Siegert, Martin J.
大量的东南极冰盖通过Totten冰川（TG）排出，被认为是未来几个世纪全球海平面大幅上升的潜在来源。研究表明，近20年来（1989-2011年），支撑接地部分的热重堆漂浮部分的表面速度和高度发生了很大变化，表面高度的变化与模拟的基础熔融速率呈强烈的反相关关系（r = 0.70, p < 0.05）。冰川-冰架耦合模拟证实，冰流和冰厚对冰架基底融化和床上障碍物接地都有响应。我们得出结论，观测到的热重变率主要是海洋驱动的。该地区的海洋变暖将导致冰盖动力增强和上游接地冰的损失。
A large volume of the East Antarctic Ice Sheet drains through the Totten Glacier (TG) and is thought to be a potential source of substantial global sea-level rise over the coming centuries. We show that the surface velocity and height of the floating part of the TG, which buttresses the grounded component, have varied substantially over two decades (1989-2011), with variations in surface height strongly anti-correlated with simulated basal melt rates (r = 0.70, p < 0.05). Coupled glacier-ice shelf simulations confirm that ice flow and thickness respond to both basal melting of the ice shelf and grounding on bed obstacles. We conclude the observed variability of the TG is primarily ocean-driven. Ocean warming in this region will lead to enhanced ice-sheet dynamism and loss of upstream grounded ice.