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Full Stokes modeling of marine ice sheets: influence of the grid size

By Gaël Durand, Olivier Gagliardini, Thomas Zwinger, Emmanuel Le Meur and Richard C.A. Hindmarsh

Abstract

Using the finite-element code Elmer, we show that the full Stokes modeling of the ice-sheet/ice-shelf transition we propose can give consistent predictions of grounding-line migration. Like other marine ice-sheet models our approach is highly sensitive to the chosen mesh resolution. However, with a grid size down to <5 km in the vicinity of the grounding line, predictions start to be robust because: (1) whatever the grid size (<5 km) the steady-state grounding-line position is sensibly the same (6 km standard deviation), and (2) with a grid-size refinement in the vicinity of the grounding line (200 m), the steady-state solution is independent of the applied perturbation in fluidity, provided this perturbation remains monotonic

Topics: Glaciology
Publisher: International Glaciological Society
Year: 2009
DOI identifier: 10.3189/172756409789624283
OAI identifier: oai:nora.nerc.ac.uk:10736
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