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| Titel |
An efficient regional energy-moisture balance model for simulation of the Greenland Ice Sheet response to climate change |
| VerfasserIn |
A. Robinson, R. Calov, 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 ; 4, no. 2 ; Nr. 4, no. 2 (2010-04-07), S.129-144 |
| Datensatznummer |
250001642
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| Publikation (Nr.) |
 copernicus.org/tc-4-129-2010.pdf |
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| Zusammenfassung |
| In order to explore the response of the Greenland ice sheet (GIS) to climate
change on long (centennial to multi-millennial) time scales, a regional
energy-moisture balance model has been developed. This model simulates
seasonal variations of temperature and precipitation over Greenland and
explicitly accounts for elevation and albedo feedbacks. From these fields,
the annual mean surface temperature and surface mass balance can be
determined and used to force an ice sheet model. The melt component of the
surface mass balance is computed here using both a positive degree day
approach and a more physically-based alternative that includes insolation
and albedo explicitly. As a validation of the climate model, we first
simulated temperature and precipitation over Greenland for the prescribed,
present-day topography. Our simulated climatology compares well to
observations and does not differ significantly from that of a simple
parameterization used in many previous simulations. Furthermore, the
calculated surface mass balance using both melt schemes falls within the
range of recent regional climate model results. For a prescribed, ice-free
state, the differences in simulated climatology between the regional
energy-moisture balance model and the simple parameterization become
significant, with our model showing much stronger summer warming. When
coupled to a three-dimensional ice sheet model and initialized with
present-day conditions, the two melt schemes both allow realistic
simulations of the present-day GIS. |
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