Total isostatic response to the complete unloading of the Greenland and Antarctic Ice Sheets.
Total isostatic response to the complete unloading of the Greenland and Antarctic Ice Sheets.
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DOI：
10.1038/s41598-022-15440-y
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发表时间：
2022-07-06
影响因子：
4.6
通讯作者：
Hollyday, Andrew
中科院分区：
文献类型：
--
作者：
Paxman, Guy J. G.;Austermann, Jacqueline;Hollyday, Andrew
格陵兰和南极冰盖下的陆地表面被覆盖在上面的大量冰均衡地压制着。在考虑区域地球动力学、地貌学和冰盖行为等因素时，在无冰情况下精确计算陆地海拔是很重要的。在这里，我们使用当代汇编的冰厚度和岩石圈有效弹性厚度计算完全重新平衡的均衡响应的固体地球的格陵兰岛和南极冰盖的完全删除。我们使用一个弹性板弯曲模型来计算均衡响应卸载的现代冰盖负载，和一个自引力粘弹性地球模型来调整剩余的均衡不平衡驱动的冰质量损失，因为末次冰盛。还考虑了冰盖移除后海平面以下地区水负荷产生的反馈。此外，我们量化的不确定性与一系列的弹性和粘弹性地球属性的总均衡响应。我们发现，床高程的最大变化后，充分的再平衡发生在中心的陆块和+783米在格陵兰岛和+936米在南极洲。相比之下，由于海平面上升、周边隆起塌陷和水负荷的综合作用，冰缘周围的区域经历了高达123米的下降。计算的均衡响应场是开放的，并有一些应用研究区域地球动力学，景观演变，冰冻圈动力学，相对海平面变化。
The land surface beneath the Greenland and Antarctic Ice Sheets is isostatically suppressed by the mass of the overlying ice. Accurate computation of the land elevation in the absence of ice is important when considering, for example, regional geodynamics, geomorphology, and ice sheet behaviour. Here, we use contemporary compilations of ice thickness and lithospheric effective elastic thickness to calculate the fully re-equilibrated isostatic response of the solid Earth to the complete removal of the Greenland and Antarctic Ice Sheets. We use an elastic plate flexure model to compute the isostatic response to the unloading of the modern ice sheet loads, and a self-gravitating viscoelastic Earth model to make an adjustment for the remaining isostatic disequilibrium driven by ice mass loss since the Last Glacial Maximum. Feedbacks arising from water loading in areas situated below sea level after ice sheet removal are also taken into account. In addition, we quantify the uncertainties in the total isostatic response associated with a range of elastic and viscoelastic Earth properties. We find that the maximum change in bed elevation following full re-equilibration occurs over the centre of the landmasses and is +783 m in Greenland and +936 m in Antarctica. By contrast, areas around the ice margins experience up to 123 m of lowering due to a combination of sea level rise, peripheral bulge collapse, and water loading. The computed isostatic response fields are openly accessible and have a number of applications for studying regional geodynamics, landscape evolution, cryosphere dynamics, and relative sea level change.
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影响因子：
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