Elmer/Ice News

2013 Summary

Cloud Elmer lowA short summary of this very productive year:
- more than 10 papers using the ice sheet/ice flow model Elmer/Ice were published from a much larger community than ever, a community paper summarizing the previous developments was published in GMD,
- 9 papers including results from the ice sheet/ice flow model Elmer/Ice were cited by the 5th IPCC report,
- 3 beginner courses (Univ. of Washington, USA, Univ. of Alberta, Canada and LGGE, France) and a first advanced course (CSC, Finland) were organized,
- the fist Elmer/Ice users meeting took place during EGU 2013.

Thanks all for contributing and making Elmer/Ice one of the most alive ice-sheet/ice flow model around the world! And thanks for the CSC for its continuous support in developing Elmer!

For 2014:
- the second Elmer/Ice users meeting will take place during EGU 2014 (Tuesday 29 May, 12:15-15:00, Room Y3)
- the examples on the svn will be soon replaced by a series of tests that can be launched automatically to verify a new installation or new developments. 
- and certainly many more news to come later!

Merry Christmas and Happy New Year 2014!

A subglacial hydrological model dedicated to glacier sliding

hydro basileThe flow of glaciers and ice-streams is strongly influenced by the presence of water at the interface between ice and bedrock. In this paper, a hydrological model evaluating the subglacial water pressure is developed with the final aim of estimating the sliding velocities of glaciers. The global model fully couples the subglacial hydrology and the ice dynamics through a water-dependent friction law. The hydrological part of the model follows a double continuum approach which relies on the use of porous layers to compute water heads in inefficient and efficient drainage systems. This method has the advantage of a relatively low computational cost that would allow its application to large ice bodies such as Greenland or Antarctica ice-streams. The hydrological model has been implemented in the finite element code Elmer/Ice, which simultaneously computes the ice flow. Herein, we present an application to the Haut Glacier d'Arolla for which we have a large number of observations, making it well suited to the purpose of validating both the hydrology and ice flow model components. The selection of hydrological, under-determined parameters from a wide range of values is guided by comparison of the model results with available glacier observations. Once this selection has been performed, the coupling between subglacial hydrology and ice dynamics is undertaken throughout a melt season. Results indicate that this new modelling approach for subglacial hydrology is able to reproduce the broad temporal and spatial patterns of the observed subglacial hydrological system. Furthermore, the coupling with the ice dynamics shows good agreement with the observed spring speed-up.

Reference: de Fleurian, B., O. Gagliardini, T. Zwinger, G. Durand, E. Le Meur, D. Mair, and P. Råback, 2013. A double continuum hydrological model for glacier applicationsThe Cryosphere, 8, 137-153, doi:10.5194/tc-8-137-2014. [link to paper]

Elmer/Ice in the 5th IPCC report

cover IPCCPresented as part of an international press conference in Stockholm on September 27 and officially released this Monday, September 30, 2013, the fifth IPCC assessment report marks a new stage in the world's scientific contribution to the understanding and awareness of impact of man on our climate. Results obtained from numerical experiments conducted with the ice sheet/ice flow model Elmer/Ice are largely included in this new report. The 9 cited references including results from Elmer/Ice are:

Bindschadler, R. A. et al., 2013. Ice-sheet model sensitivities to environmental forcing and their use in projecting future sea level (the SeaRISE project), Journal of Glaciology, Vol. 59(214), p. 195-224, doi:10.3189/2013JoG12J125. [link to paper]

Durand G. et al., 2009. Full Stokes modeling of marine ice sheets: influence of the grid size, Ann. Glaciol., 50(52), 109–114.

Favier L. et al., 2012. A three-dimensional full Stokes model of the grounding line dynamics: effect of a pinning point beneath the ice shelf, The Cryosphere, 6, 101-112, doi:10.5194/tc-6-101-2012. [link to paper]

Gillet-Chaulet, F. et al., 2012. Greenland ice sheet contribution to sea-level rise from a new-generation ice-sheet model, The Cryosphere, 6, 1561-1576, doi:10.5194/tc-6-1561-2012. [link to paper]

Gudmundsson, G. H. et al., 2012. The stability of grounding lines on retrograde slopes, The Cryosphere, 6, 1497-1505, doi:10.5194/tc-6-1497-2012. [link to paper]

Nowicki, S. et al., 2013. Insights into spatial sensitivities of ice mass response to environmental change from the SeaRISE ice sheet modeling project II: Greenland. Journal of Geophysical Research: Earth Surface 118 (2), 1025-1044, doi:10.1002/jgrf.20076. [link to paper]

Pattyn, F. et al., 2013. Grounding-line migration in plan-view marine ice-sheet models: results of the ice2sea MISMIP3d intercomparison, J. Glaciol., 59, doi:10.3189/2013JoG12J129.

Seddik H., R. Greve, T. Zwinger, F. Gillet-Chaulet and O. Gagliardini, 2012. Simulations of the Greenland ice sheet 100 years into the future with the full Stokes model Elmer/Ice, J. Glaciol., 58(209), 427-440. [link to paper]

Shannon, S. R., et al., 2013. Enhanced basal lubrication and the contribution of the Greenland ice sheet to future sea-level rise, PNAS, 110(35), 14156--14161, doi:10.1073/pnas.1212647110.

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