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| Titel |
Effect of rapid grounding line migration investigated with 3D ice sheet-ice shelf models (MISMIP3d) |
| VerfasserIn |
F. Pattyn, D. Docquier, G. Durand, L. Favier, O. Gagliardini, R. Hindmarsh, T. Zwinger, MISMIP3d participants |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250066390
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| Zusammenfassung |
| Understanding and attributing future sea-level changes demands serious efforts on the
development of efficient ice sheet—ice shelf models that capture the essential physics and
mechanics of grounding line behavior.
While semi-analytical solutions for grounding line behavior are available for the flowline
case, such solution fails to exist for more complex three-dimensional geometries. A way of
evaluating the quality of ice sheet models is to verify them against more complex model
solutions under controlled conditions (Marine Ice Sheet Model Intercomparison —
MISMIP).
Given the computational demands of such models, it is extremely attractive
from a computational point of view to use flux/thickness parameterizations in 3d
models. Here we investigated the transition between ice sheet and ice shelf with
series of different numerical models, ranging from full Stokes (Elmer/Ice) models,
pseudo-spectral methods to a 2d vertically integrated finite-difference ’shelfy-stream’
model, taking into account grounding line dynamics, and using parameterizations by
Schoof (2007) and Pollard and DeConto (2009). Rapid grounding line migration was
provoked by changing sliding at the grounding line, resulting in curved grounding
lines influenced by lateral effects. We tested whether flux parameterizations are
still valid under such conditions, especially when buttressing effects are taken into
account.
Results of other participants in the intercomparison exercise are presented alongside the
initial benchmark results. |
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