Elmer/Ice News

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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Basal traction mainly dictated by hard-bed physics over grounded regions of Greenland

On glaciers and ice sheets, identifying the relationship between velocity and traction is critical to constrain the bed physics that controls ice flow. We determine the spatial relationship between velocity and traction in all eight major drainage catchments of Greenland. We find the relationships are consistent with our current understanding of basal physics in each catchment.

We identify catchments that predominantly show Mohr–Coulomb-like behavior typical of deforming beds or significant cavitation, as well as catchments that predominantly show rate-strengthening behavior typical of Weertman-type hard-bed physics.

Overall, the traction relationships suggest that the flow field and surface geometry of the grounded regions in Greenland is mainly dictated by Weertman-type hard-bed physics up to velocities of approximately 450m/yr, except within the Northeast Greenland Ice Stream and areas near floatation.

The results and analysis serve as a first constraint on the physics of basal motion over the grounded regions of Greenland and provide unique insight into future dynamics and vulnerabilities in a warming climate.

 

 

Read More: Maier, N., Gimbert, F., Gillet-Chaulet, F., Gilbert, A., 2021. Basal traction mainly dictated by hard-bed physics over grounded regions of Greenland. The Cryosphere 15, 1435–1451. https://doi.org/10.5194/tc-15-1435-2021

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