Water pressure fluctuations control variability in sediment flux and slip dynamics beneath glaciers and ice streams
Water pressure fluctuations control variability in sediment flux and slip dynamics beneath glaciers and ice streams
复制标题
水压波动控制冰川和冰流下方沉积物通量和滑移动力学的变化
DOI:
10.1038/s43247-020-00074-7
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发表时间:
2020
影响因子:
7.9
通讯作者:
Suckale, Jenny
中科院分区:
文献类型:
--
作者:
Damsgaard, Anders;Goren, Liran;Suckale, Jenny
Rapid ice loss is facilitated by sliding over beds consisting of reworked sediments and erosional products, commonly referred to as till. The dynamic interplay between ice and till reshapes the bed, creating landforms preserved from past glaciations. Leveraging the imprint left by past glaciations as constraints for projecting future deglaciation is hindered by our incomplete understanding of evolving basal slip. Here, we develop a continuum model of water-saturated, cohesive till to quantify the interplay between meltwater percolation and till mobilization that governs changes in the depth of basal slip under fast-moving ice. Our model explains the puzzling variability of observed slip depths by relating localized till deformation to perturbations in pore-water pressure. It demonstrates that variable slip depth is an inherent property of the ice-meltwater-till system, which could help understand why some paleo-landforms like grounding-zone wedges appear to have formed quickly relative to current till-transport rates.
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影响因子:
3.4
作者:
Charles F. Raymond
通讯作者:
Charles F. Raymond
DOI:
--
发表时间:
2016
期刊:
影响因子:
--
作者:
A. Damsgaard;D. Egholm;L. Beem;S. Tulaczyk;N. K. Larsen;J. Piotrowski;M. Siegfried
通讯作者:
M. Siegfried
影响因子:
2.2
作者:
U. H. Fischer;G. Clarke
通讯作者:
G. Clarke
DOI:
--
发表时间:
2017
期刊:
影响因子:
--
作者:
A. Damsgaard;A. Cabrales;J. Suckale;L. Goren
通讯作者:
L. Goren
DOI:
--
发表时间:
2004
期刊:
影响因子:
--
作者:
N. Iverson;T. Hooyer
通讯作者:
T. Hooyer