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

• Published in: Annals of Glaciology
• Main Authors: DURAND, Gaël, GAGLIARDINI, Olivier, ZWINGER, Thomas, LE MEUR, Emmanuel, HINDMARSH, Richard C.A.
• Format: Other/Unknown Material
• Language: English
• Published: International Glaciological Society 2009
• Subjects: Planète et Univers [physics]/Sciences de la Terre/Glaciologie; Terre Adélie; Terre-Adélie; Ice Sheet; Ice Shelf
• Online Access: https://oskar-bordeaux.fr/handle/20.500.12278/28991; https://doi.org/10.3189/172756409789624283

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. Dynamique des glaciers côtiers et rôle sur le bilan de masse global de l'Antarctique zone atelier du glacier de l'Astrolabe, Terre Adélie