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Author: Anders Damsgaard <[email protected]> | |
Date: Wed, 9 Dec 2020 11:09:29 +0100 | |
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+The majority of glaciers and ice sheets flow on a bed of loose and | |
+thawed sediments. These sediments are weakened by pressurized glacial | |
+meltwater, and their lubrication accelerates the ice movement. In | |
+formerly-glaciated areas of the world, for example Northern Europe, | |
+North America, and in the forelands of the Alps, the landscape is | |
+reshaped and remolded by past ice moving the sediments along with | |
+its flow. The sediment movement is also observed under current | |
+glaciers, both the fast-moving ice streams of the Greenland and | |
+Antarctic ice sheets, as well as smaller glaciers in the mountainous | |
+areas of Alaska, northern Sweden, and elsewhere. The movement of | |
+sediment could be important for the past progression of glaciations, | |
+and how resilient marine-terminating ice streams are against sea-level | |
+rise. | |
+ | |
+Today, the Nature-group journal Communications Earth & Environment | |
+published my paper on sediment beneath ice. Together with co-authors | |
+Liran Goren, University of the Negev (Israel), and Jenny Suckale, | |
+Stanford University (California, USA), we present a new computer | |
+model that simulates the coupled mechanical behavior of ice, sediment, | |
+and meltwater. We calibrate the model against real materials, and | |
+provide a way forward for including sediment transport in ice-flow | |
+models. We also show that water-pressure variations with the right | |
+frequency can create create very weak sections inside the bed, and | |
+this greatly enhances sediment transport. I designed the freely-available | |
+program cngf-pf for the simulations. | |
+ | |
+ | |
+## Abstract | |
+ | |
+ Water pressure fluctuations control variability in sediment | |
+ flux and slip dynamics beneath glaciers and ice streams | |
+ | |
+ 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. | |
+ | |
+ | |
+## Metrics | |
+ | |
+It is a substantial task to prepare a scientific publication. The | |
+commit counts below mark the number of revisions done during | |
+preparation of this paper: | |
+ | |
+ - Main article text: 239 commits | |
+ - Supplementary information text: 35 commits | |
+ - Experiments and figures: 282 commits | |
+ - Simulation software: 354 commits | |
+ | |
+ | |
+## Links and references: | |
+ | |
+ - Publication on journal webpage: | |
+ - Article PDF (?? MB): | |
+ - Supplementary information PDF (?? MB): | |
+ - Source code for producing figures: git://src.adamsgaard.dk/cngf-pf-exp1 | |
+ - Simulation software: git://src.adamsgaard.dk/cngf-pf |