the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Deglaciation and future stability of the Coats Land ice margin, Antarctica
Kelly Hogan
James M. Smith
James A. Smith
Claus-Dieter Hillenbrand
Alastair G. C. Graham
Peter Fretwell
Claire Allen
Vicky Peck
Jan-Erik Arndt
Boris Dorschel
Christian Hübscher
Andrew M. Smith
Robert Larter
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till extrusion, whereby deformable sediment is squeezed out from under the ice like toothpaste as it settles down at each low-tide position, as the most likely process.
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In Antarctica, supraglacial lakes often form near grounding lines due to surface melting. We model viscoelastic tidal flexure in these regions to assess its contribution to lake drainage via hydrofracturing. Results show that tidal flexure and lake-water pressure jointly control drainage near unconfined grounding lines. Sensitivity analysis indicates the importance of the Maxwell time of ice in modulating the tidal response.
We investigated the influence of several regional climate models on the Antarctic Ice Sheet when applied as forcing for the Parallel Ice Sheet Model (PISM). Our study shows that the choice of regional climate model forcing results in uncertainties of around a tenth of those in future sea level rise projections and also affects the extent of grounding line retreat in West Antarctica.