Elmer/Ice News

A new calving rate parameterization for ice-cliffs

Picture of deforming/calving ice-cliff  (from Nature Com.)Using HiDEM and Elmer/Ice to investigate the modes through which ice cliffs can structurally fail, this article contributes a conservative ice-cliff failure retreat rate parameterization that can easily be included in ice-sheet models. Results show the importance of viscous deformation, shear-band formation, and brittle-tensile failure in the context of marine ice-cliff instability. The findings also include possible mechanisms to inhibit a runaway situation by two major contributions, namely, the backforce exhibited by iceberg mélange as well as viscous flow deformation changing the cliff's shape.

Read more: Crawford, A.J., Benn, D.I., Todd, J, Åström, J.A, Bassis, J.N. and Zwinger, T., 2021. Marine ice-cliff instability modeling shows mixed-mode ice-cliff failure and yields calving rate parameterization. Nat Commun 12, 2701, doi:10.1038/s41467-021-23070-7

 

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Improved projections of land ice contributions

An article with the titleAntarctic Ice flow simulated by Elmer/Ice ( Image: Rupert Gladstone) Projected land ice contributions to twenty-first-century sea level rise published in Nature explores the contribution to sea level in the 21st century arising from the world’s glaciers and the Greenland as well as the Antarctic ice sheet.  The study is a synthesis of the research of more than 80 authors from 38 international research groups and brings together both computer models and statistical techniques to make predictions for the latest socio-economic scenarios. It includes results obtained with Elmer/Ice for the Antarctic ice sheet (the only full-Stokes contribution to the study).   Results from this research shall inform the Intergovernmental Panel on Climate Change and contribute its Sixth Assessment report, due to be published later this year.

Read more: Edwards, T.L, and 81 others, 2021. Projected land ice contributions to twenty-first-century sea level rise, Nature, 593, 74–82, doi:10.1038/s41586-021-03302-y.

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Elmer/Ice @ vEGU2021

egu plainHere is a list of the 12 presentations using Elmer/Ice that will be presented during the next vEGU 2021, 19-30 April 2021

Monday 26 April
Eliot Jager, Fabien Gillet-Chaulet, and Jérémie Mouginot, 
Data assimilation and ensemble method applied to Upernavik Isstrom, Mon, 26 Apr, 14:07–14:09
Anna Derkacheva, Fabien Gillet-Chaulet, and Jeremie Mouginot, Modeling of the Russell glacier's basal conditions at seasonal time scale using the satellite observations of surface ice speed, Mon, 26 Apr, 14:09–14:11

Tuesday 27 April
Nanna Bjørnholt Karlsson, Anne M Solgaard, Kenneth D Mankoff, Fabien Gillet-Chaulet, Joseph A. MacGregor, Douglas I. Benn, Ian Hewitt, and Robert S. Fausto, 
Subglacial Discharge of the Greenland Ice Sheet from Basal Melt, Tue, 27 Apr, 09:08–09:10
Felicity Holmes, Eef van Dongen, and Nina Kirchner, Modelling calving at Kronebreen, Svalbard using Elmer/Ice, Tue, 27 Apr, 13:41–13:43
Yu Wang, Chen Zhao, Rupert Gladstone, and Ben Galton-Fenzi, Thermal structure of the Amery Ice Shelf from borehole observations and simulations, Tue, 27Apr, 14.03–14:05

Wednesday 28 April
Olivier Gagliardini, Fabien Gillet-Chaulet, and Florent Gimbert, Relative control of bedrock roughness versus topography on global glacier bed friction, Wed, 28 Apr, 14:09–14:11
Nathan Maier, Florent Gimbert, Fabien Gillet-Chaulet, and Adrien Gilbert, Constraints on the relationship between velocity and basal traction over the grounded regions of Greenland, Wed, 28 Apr, 14:17–14:19
Chen Zhao, Rupert Gladstone, Ben Galton-Fenzi, David Gwyther, Representation of basal melting in idealised coupled ice sheet ocean models, Wed, 28 April, 15:54-15:56

Thursday 29 April
Samuel Cook and Fabient Gillet-Chaulet, 2D sequential data assimilation in Elmer/Ice with Stokes, Thu, 29 Apr, 09:37–09:39
Rupert Gladstone, Yufang Zhang, Thomas Zwinger, Fabien Gillet-Chaulet, Michael Wolovick, John Moore, Chen Zhao, Yu Wang, and Mauro Werder, Optimising a regional Antarctic Ice Sheet model to investigate basal conditions and initialise transient experiments, Thu, 29 Apr, 09:35–09:37
Tryggvi Unnsteinsson, Gwenn Flowers, and Glyn Williams-Jones, Modelling the formation and evolution of glaciovolcanic caves and chimneys, Thu, 29 Apr, 11:49–11:51

Friday 30 April
Urruty Benoît, Gagliardini Olivier, and Gillet-Chaulet Fabien, Stability of current Antarctica grounding lines, Fri, 30 Apr, 09:25–09:27

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