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| Titel |
Simulating the Greenland ice sheet under present-day and palaeo constraints including a new discharge parameterization |
| VerfasserIn |
R. Calov, A. Robinson, M. Perrette, A. Ganopolski |
| 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 (2015-02-05), S.179-196 |
| Datensatznummer |
250116744
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| Publikation (Nr.) |
 copernicus.org/tc-9-179-2015.pdf |
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| Zusammenfassung |
| In this paper, we propose a new sub-grid scale parameterization for the ice
discharge into the ocean through outlet glaciers and inspect the role of
different observational and palaeo constraints for the choice of an optimal
set of model parameters. This parameterization was introduced into the
polythermal ice-sheet model SICOPOLIS, which is coupled to the regional
climate model of intermediate complexity REMBO. Using the coupled model, we
performed large ensemble simulations over the last two glacial cycles by
varying two major parameters: a melt parameter in the surface melt scheme of
REMBO and a discharge scaling parameter in our parameterization of ice
discharge. Our empirical constraints are the present-day Greenland ice sheet
surface elevation, the surface mass balance partition (ratio between total
ice discharge and total precipitation) and the Eemian interglacial elevation
drop relative to present day in the vicinity of the NEEM ice core. We show
that the ice discharge parameterization enables us to simulate both the
correct ice-sheet shape and mass balance partition at the same time without
explicitly resolving the Greenland outlet glaciers. For model verification,
we compare the simulated total and sectoral ice discharge with other
estimates. For the model versions that are consistent with the range of
observational and palaeo constraints, our simulated Greenland ice sheet
contribution to Eemian sea-level rise relative to present-day amounts to
1.4 m on average (in the range of 0.6 and 2.5 m). |
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