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| Titel |
Enthalpy benchmark experiments for numerical ice sheet models |
| VerfasserIn |
T. Kleiner, M. Rückamp, J. H. Bondzio, A. Humbert |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 9, no. 1 ; Nr. 9, no. 1 (2015-02-06), S.217-228 |
| Datensatznummer |
250116746
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| Publikation (Nr.) |
 copernicus.org/tc-9-217-2015.pdf |
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| Zusammenfassung |
We present benchmark experiments to test the implementation of enthalpy and
the corresponding boundary conditions in numerical ice sheet models. Since we
impose several assumptions on the experiment design, analytical solutions can
be formulated for the proposed numerical experiments. The first experiment
tests the functionality of the boundary condition scheme and the basal melt
rate calculation during transient simulations. The second experiment
addresses the steady-state enthalpy profile and the resulting position of the
cold–temperate transition surface (CTS). For both experiments we assume ice
flow in a parallel-sided slab decoupled from the thermal regime.
We compare simulation results achieved by three different ice flow-models
with these analytical solutions. The models agree well to the analytical
solutions, if the change in conductivity between cold and temperate ice is
properly considered in the model. In particular, the enthalpy gradient on the
cold side of the CTS goes to zero in the limit of vanishing temperate-ice
conductivity, as required from the physical jump conditions at the CTS. |
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