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| Titel |
Thermo-mechanically coupled, prognostic Simulations of Midtre Lovénbreen with a full Stokes model |
| VerfasserIn |
Thomas Zwinger, John C. Moore |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250035059
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| Zusammenfassung |
| Midtre Lovénbreen, Svalbard is an Arctic glacier with an extensive data set of geophysical
measurements available spanning several decades. On the basis of these excellent observation
records we set up a model for the digital elevation model (DEM) from the year 1977 in order
to get diagnostic results with the full Stokes FEM code Elmer/Ice. The effect of superimposed
ice formation as a contribution to the energy budget of the glacier is accounted for by the
model. Motivated by the occurrence of pronounced anomalies of the velocity field in under
determined parts of the DEM, a prognostic (transient) simulation forced by an averaged mass
balance and surface temperature distribution with an integration time of 53 years starting
from the diagnostic results was set up. The fact that the unphysical velocities were quickly
damped out by an adaption of the free surface within the first timesteps of this prognostic
run, leads to the conclusion that simulations based on DEM geometry are very
sensitive to errors, which are present even in this well studied glacier. This presents
certain obstacles with respect to the spin-up of simulations that start from DEM’s. |
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