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dc.contributor.authorBerends, Constantijn J.
dc.contributor.authorGoelzer, Heiko
dc.contributor.authorvan de Wal, Roderik S.W.
dc.date.accessioned2021-07-05T11:19:53Z
dc.date.available2021-07-05T11:19:53Z
dc.date.created2021-06-26T09:59:39Z
dc.date.issued2021
dc.identifier.issn1991-959X
dc.identifier.urihttps://hdl.handle.net/11250/2763382
dc.description.abstractImproving our confidence in future projections of sea-level rise requires models that can simulate ice-sheet evolution both in the future and in the geological past. A physically accurate treatment of large changes in ice-sheet geometry requires a proper treatment of processes near the margin, like grounding line dynamics, which in turn requires a high spatial resolution in that specific region, so that small-scale topographical features are resolved. This leads to a demand for computationally efficient models, where such a high resolution can be feasibly applied in simulations of 105–107 years in duration. Here, we present and evaluate a new ice-sheet model that solves the hybrid SIA–SSA approximation of the stress balance, including a heuristic rule for the grounding-line flux. This is done on a dynamic adaptive mesh which is adapted to the modelled ice-sheet geometry during a simulation. Mesh resolution can be configured to be fine only at specified areas, such as the calving front or the grounding line, as well as specified point locations such as ice-core drill sites. This strongly reduces the number of grid points where the equations need to be solved, increasing the computational efficiency. A high resolution allows the model to resolve small geometrical features, such as outlet glaciers and sub-shelf pinning points, which can significantly affect large-scale ice-sheet dynamics. We show that the model reproduces the analytical solutions or model intercomparison benchmarks for a number of schematic ice-sheet configurations, indicating that the numerical approach is valid. Because of the unstructured triangular mesh, the number of vertices increases less rapidly with resolution than in a square-grid model, greatly reducing the required computation time for high resolutions. A simulation of all four continental ice sheets during an entire 120 kyr glacial cycle, with a 4 km resolution near the grounding line, is expected to take 100–200 wall clock hours on a 16-core system (1600–3200 core hours), implying that this model can be feasibly used for high-resolution palaeo-ice-sheet simulations.en_US
dc.language.isoengen_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.titleThe Utrecht Finite Volume Ice-Sheet Model: UFEMISM (version 1.0)en_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.rights.holder© 2021, Author(s)
dc.description.versionpublishedVersionen_US
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2
dc.identifier.doi10.5194/gmd-14-2443-2021
dc.identifier.cristin1918674
dc.source.journalGeoscientific Model Developmenten_US


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Navngivelse 4.0 Internasjonal
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