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| Titel |
Sensitivity of a Greenland ice sheet model to atmospheric forcing fields |
| VerfasserIn |
A. Quiquet, H. J. Punge, C. Ritz, X. Fettweis, H. Gallée, M. Kageyama, G. Krinner, D. Salas y Melia, J. Sjolte |
| 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 ; 6, no. 5 ; Nr. 6, no. 5 (2012-09-18), S.999-1018 |
| Datensatznummer |
250003783
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| Publikation (Nr.) |
 copernicus.org/tc-6-999-2012.pdf |
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| Zusammenfassung |
Predicting the climate for the future and how it will impact ice sheet evolution requires coupling ice sheet
models with climate models. However, before we attempt to develop a realistic coupled setup, we propose, in this study,
to first analyse the impact of a model simulated climate on an ice sheet. We undertake this exercise for a set of
regional and global climate models. Modelled near surface air temperature and precipitation are
provided as upper boundary conditions to the GRISLI (GRenoble Ice Shelf and Land Ice model)
hybrid ice sheet model (ISM) in its Greenland configuration.
After 20 kyrs of simulation,
the resulting ice sheets
highlight the differences between the climate models.
While modelled ice sheet sizes are generally comparable to the observed one, there
are considerable deviations among the ice sheets on regional scales.
These deviations can be explained by biases in temperature and precipitation near the coast. This is especially true in
the case of global models. But the deviations between the climate models are also due to the differences
in the atmospheric general circulation.
To account for these differences in the context of
coupling ice sheet models with climate models, we conclude that appropriate
downscaling methods will be needed. In some cases, systematic corrections of the climatic variables at the
interface may be required to obtain realistic results
for the Greenland ice sheet (GIS). |
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