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Grounding-line migration in plan-view marine ice-sheet models: results of the ice2sea MISMIP3d intercomparison

  • Predictions of marine ice-sheet behaviour require models able to simulate grounding-line migration. We present results of an intercomparison experiment for plan-view marine ice-sheet models. Verification is effected by comparison with approximate analytical solutions for flux across the grounding line using simplified geometrical configurations (no lateral variations, no buttressing effects from lateral drag). Perturbation experiments specifying spatial variation in basal sliding parameters permitted the evolution of curved grounding lines, generating buttressing effects. The experiments showed regions of compression and extensional flow across the grounding line, thereby invalidating the boundary layer theory. Steady-state grounding-line positions were found to be dependent on the level of physical model approximation. Resolving grounding lines requires inclusion of membrane stresses, a sufficiently small grid size (<500 m), or subgrid interpolation of the grounding line. The latter still requires nominal grid sizes of <5 km. ForPredictions of marine ice-sheet behaviour require models able to simulate grounding-line migration. We present results of an intercomparison experiment for plan-view marine ice-sheet models. Verification is effected by comparison with approximate analytical solutions for flux across the grounding line using simplified geometrical configurations (no lateral variations, no buttressing effects from lateral drag). Perturbation experiments specifying spatial variation in basal sliding parameters permitted the evolution of curved grounding lines, generating buttressing effects. The experiments showed regions of compression and extensional flow across the grounding line, thereby invalidating the boundary layer theory. Steady-state grounding-line positions were found to be dependent on the level of physical model approximation. Resolving grounding lines requires inclusion of membrane stresses, a sufficiently small grid size (<500 m), or subgrid interpolation of the grounding line. The latter still requires nominal grid sizes of <5 km. For larger grid spacings, appropriate parameterizations for ice flux may be imposed at the grounding line, but the short-time transient behaviour is then incorrect and different from models that do not incorporate grounding-line parameterizations. The numerical error associated with predicting grounding-line motion can be reduced significantly below the errors associated with parameter ignorance and uncertainties in future scenarios.show moreshow less

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Metadaten
Author:Frank Pattyn, Laura Perichon, Gael Durand, Lionel Favier, Olivier Gagliardini, Richard C. A. Hindmarsh, Thomas Zwinger, Torsten AlbrechtGND, Stephen Cornford, David Docquier, Johannes J. Furst, Daniel Goldberg, G. Hilmar Gudmundsson, Angelika Humbert, Moritz Huetten, Philippe Huybrechts, Guillaume Jouvet, Thomas Kleiner, Eric Larour, Daniel Martin, Mathieu Morlighem, Anthony J. Payne, David Pollard, Martin Rueckamp, Oleg Rybak, Helene Seroussi, Malte Thoma, Nina Wilkens
DOI:https://doi.org/10.3189/2013JoG12J129
ISSN:0022-1430 (print)
Parent Title (English):Journal of glaciology
Publisher:International Glaciological Society
Place of publication:Cambridge
Document Type:Article
Language:English
Year of first Publication:2013
Year of Completion:2013
Release Date:2017/03/26
Volume:59
Issue:215
Pagenumber:13
First Page:410
Last Page:422
Funder:ice2sea project from the European Union 7th Framework Programme [226375]; NASA Cryospheric Sciences Program; NASA Modeling Analysis and Prediction Program; NASA
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
Peer Review:Referiert