Elmer/Ice is an open-source high-fidelity ice dynamic code developed at CSC-IT Center of Science. It utilizes the Finite Element Method and doesn’t apply any simplifications in terms of neglected stress components, which makes it applicable to glaciological problems where common ice-sheet codes are unable to capture the physics of steeply inclined or marine terminated glaciers.
Animation of temporal evolution (=retreat) of Midtre Lovénbreen from 1977 to 2050. Credits CSC/Artic Centre (T. Zwinger,/J.C.Moore, simulation/data), CSC (J.Hokkanen, visualisation)
Gagliardini, O., T. Zwinger, F. Gillet-Chaulet, G. Durand, L. Favier, B. de Fleurian, R. Greve, M. Malinen, C. Martín, P. Råback, J. Ruokolainen, M. Sacchettini, M. Schäfer, H. Seddik, and J. Thies, 2013. Capabilities and performance of Elmer/Ice, a new-generation ice sheet model, Geosci. Model Dev., 6, 1299-1318, doi:10.5194/gmd-6-1299-2013.
Elmer/Ice support for continuation and finalization of SVALI projects
eSTICC contributed to unfinished activities from the NCoE SVALI by continuing and finalizing the projects listed below. Those activities were mainly focused around the high-fidelity ice sheet model Elmer/Ice. Most of these projects helped to finalize the PhD studies of students that either were working within or were supported by SVALI.
eSTICC contributed to two publications for the PhD thesis of Dorothée Vallot, an associated SVALI-student. Bith focused on the fasted outlet glacier on Svalbard, Kronebreen. The studies used Elmer/Ice and Elmer/Ice amongst other models that were constrained and driven by field and remote sensing data. Papers published are
Vallot, D., J. Åström, T. Zwinger, R. Pettersson, A. Everett, D.I. Benn, A. Luckman, W.J.J. van Pelt, F. Nick, and J. Kohler, 2018. Effects of undercutting and sliding on calving: a global approach applied to Kronebreen, Svalbard. The Cryosphere, 12, 609-625, doi:10.5194/tc-12-609-2018
Vallot, D., R. Pettersson, A. Luckman, D. Benn, T. Zwinger, W.J.J. van Pelt, J. Kohler, M. Schäfer, B. Claremar and N.R.J. Hulton, 2017. Basal dynamics of Kronebreen, a fast-flowing tidewater glacier in Svalbard: Non-local spatio-temporal response to water input, Journal of Glaciology, 1-13, doi:doi:10.1017/jog.2017.69.
The sub-glacial laboratory at Engabreen, Norway was a major study site in the SVALI-NCoE project. SVALI PhD-student Pierre-Marie Lefeuvre investigated stress distribution changes using Elmer/Ice linking those to data recorded with the pressure sensors installed at the lab, resulting in the following publication
Lefeuvre P.-M., T. Zwinger, M. Jackson, O. Gagliardini, G. Lappegard and J.O. Hagen, 2018. Stress Redistribution Explains Anti-correlated Subglacial Pressure Variations. Front. Earth Sci. 5:110. doi:10.3389/feart.2017.00110
This was a project study on calving law parametrization using a combined model approach of Elmer/Ice (continuum model) and a discrete particle model, HiDEM. This was performed in order to find out calving parametrisations for continuum models. The corresponding publication is
Benn, D.I., J. Åström, T. Zwinger, J. Todd, F.M. Nick, S. Cook, N.R.J. Hulton, and A. Luckman, 2017. Melt-under-cutting and buoyancy-driven calving from tidewater glaciers: new insights from discrete element and continuum model simulations, Journal of Glaciology, 1-12, doi:10.1017/jog.2017.41.
This is a study on interaction of sudden subglacial water drainage (jökulhlaup) on ice mechanics based on a real case in Iceland, combining in a nice way data that was obtained during SVALI NCoE and modelling using Elmer/Ice. This was in direct support of the PhD thesis from SVALI student Bergur Einarson. The corresponding publication is
Einarsson, B., T. Jóhannesson, T. Thorsteinsson, E. Gaidos, and T. Zwinger, 2017. Subglacial flood path development during a rapidly rising jökulhlaup from the western Skaftá cauldron, Vatnajökull, Iceland, Journal of Glaciology, 1-13, doi:10.1017/jog.2017.33.
This is a study on inverse determination of past surface mass balance from a series of digital elevation models using the ice flow model Elmer/Ice, thus a combination of data and modelling. It is a direct contribution to the PhD thesis of SVALI student Ilona Välisuo. The corresponding publication is
Välisuo, I., T. Zwinger and J. Kohler, 2017. Inverse solution of surface mass balance of Midtre Lovénbreen, Svalbard, Journal of Glaciology, 1-10, doi:10.1017/jog.2017.26.
A detailed study on the processes that lead to the surge of Basin 3 on Austfonna, Svalbard using Elmer/Ice in combination with other models (BISICLES and HiDEM) resulted in two publications that contributed to the successful PhD thesis of SVALI student Yongmei Gong
Gong, Y., T. Zwinger, S. Cornford, R. Gladstone, M. Schäfer, and J.C. Moore, 2016. Importance of basal boundary conditions in transient simulations: case study of a surging marine-terminating glacier on Austfonna, Svalbard, Journal of Glaciology, pp. 1–12, doi:10.1017/jog.2016.121.
Gong, Y., Zwinger, T., Åström, J., Altena, B., Schellenberger, T., Gladstone, R., and Moore, J. C., 2018. Simulating the roles of crevasse routing of surface water and basal friction on the surge evolution of Basin 3, Austfonna ice cap. The Cryosphere, 12, 1563-1577, doi:10.5194/tc-12-1563-2018
A SVALI-supported study of a special hybrid ice-sheet algorithm combining shallow ice approximation (SIA) and unaltered Stokes (full Stokes = FS) solution. The corresponding publication is
Ahlkrona, J., P. Lötstedt, N. Kirchner, and T. Zwinger, 2016. Dynamically coupling the non-linear Stokes equations with the shallow ice approximation in glaciology: Description and first applications of the ISCAL method. J. Comp. Phys., 308, 1-19, doi:.