tadd post on commsenv paper, wait for publication - adamsgaard.dk - my academic webpage
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(HTM) Author: Anders Damsgaard <anders@adamsgaard.dk>
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 & Environment
+id=commsenv
+tags=science, glaciology, ice sheet
+created=2020-12-09
+updated=2020-12-09
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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 producing figures</a></li>
+ <li><a href="https://src.adamsgaard.dk/cngf-pf">Simulation software</a></li>
+</ul>