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

Journal article


Publication Details

Author(s): Pattyn F, Perichon L, Durand G, Favier L, Gagliardini O, Hindmarsh R, Zwinger T, Albrecht T, Cornford S, Docquier D, Fürst J, Goldberg D, Gudmundsson H, Humbert A, Hütten M, Huybrechts P, Jouvet G, Kleiner T, Larour E, Martin D, Morlighem M, Payne T, Pollard D, Rückamp M, Rybak O, Seroussi H, Thoma M, Wilkens N
Journal: Journal of Glaciology
Publisher: CAMBRIDGE UNIV PRESS
Publication year: 2013
Volume: 59
Journal issue: 215
Pages range: 410-422
ISSN: 0022-1430
Language: English


Abstract

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. 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.


FAU Authors / FAU Editors

Fürst, Johannes Dr.
Institut für Geographie


External institutions with authors

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung (AWI)
California Institute of Technology (Caltech)
Pennsylvania State University (Penn State)
Swansea University
Universität Hamburg
Université libre de Bruxelles (ULB)
University of Bristol
University of California Irvine


How to cite

APA:
Pattyn, F., Perichon, L., Durand, G., Favier, L., Gagliardini, O., Hindmarsh, R.,... Wilkens, N. (2013). Grounding-line migration in plan-view marine ice-sheet models: results of the ice2sea MISMIP3d intercomparison. Journal of Glaciology, 59(215), 410-422. https://dx.doi.org/10.3189/2013JoG12J129

MLA:
Pattyn, Frank, et al. "Grounding-line migration in plan-view marine ice-sheet models: results of the ice2sea MISMIP3d intercomparison." Journal of Glaciology 59.215 (2013): 410-422.

BibTeX: 

Last updated on 2018-02-11 at 22:10