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commit dc57d5bcd3f00e53e7ec30d74f02c5fb2f5c5009 | |
parent 612e18e0f93f07412eec46fd695652d75ea808b3 | |
Author: Anders Damsgaard <[email protected]> | |
Date: Wed, 9 Dec 2020 11:04:28 +0100 | |
add post on commsenv paper, wait for publication | |
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+filename=commsenv.html | |
+title=New paper out on the coupled dynamics of ice, meltwater, and till | |
+description=A brief summary of my new paper published in Communications Earth … | |
+id=commsenv | |
+tags=science, glaciology, ice sheet | |
+created=2020-12-09 | |
+updated=2020-12-09 | |
diff --git a/pages/007-commsenv.html b/pages/007-commsenv.html | |
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+<p>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.</p> | |
+ | |
+<p>Today, the Nature-group journal <a | |
+href="https://www.nature.com/commsenv/">Communications Earth & | |
+Environment</a> 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 <a | |
+href="https://src.adamsgaard.dk/cngf-pf">cngf-pf</a> for the | |
+simulations.</p> | |
+ | |
+<h2>Abstract</h2> | |
+<blockquote> | |
+<b>Water pressure fluctuations control variability in sediment flux | |
+and slip dynamics beneath glaciers and ice streams</b> | |
+<br><br> | |
+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. | |
+</blockquote> | |
+ | |
+<h2>Metrics</h2> | |
+<p>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:</p> | |
+ | |
+<ul> | |
+ <li>Main article text: 239 commits</li> | |
+ <li>Supplementary information text: 35 commits</li> | |
+ <li>Experiments and figures: 282 commits</li> | |
+ <li>Simulation software: 354 commits</li> | |
+</ul> | |
+ | |
+<h2>Links and references:</h2> | |
+<ul> | |
+ <li><a href="">Publication on journal webpage</a></li> | |
+ <li><a href="">Article PDF</a> (?? MB)</li> | |
+ <li><a href="">Supplementary information PDF</a> (?? MB)</li> | |
+ <li><a href="https://src.adamsgaard.dk/cngf-pf-exp1">Source code for p… | |
+ <li><a href="https://src.adamsgaard.dk/cngf-pf">Simulation software</a… | |
+</ul> |