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| Titel |
Coupled ice sheet–climate modeling under glacial and pre-industrial boundary conditions |
| VerfasserIn |
F. A. Ziemen, C. B. Rodehacke, U. Mikolajewicz |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 10, no. 5 ; Nr. 10, no. 5 (2014-10-07), S.1817-1836 |
| Datensatznummer |
250117057
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| Publikation (Nr.) |
 copernicus.org/cp-10-1817-2014.pdf |
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| Zusammenfassung |
In the standard Paleoclimate Modelling Intercomparison
Project (PMIP) experiments, the Last Glacial Maximum (LGM) is modeled in
quasi-equilibrium with atmosphere–ocean–vegetation general circulation
models (AOVGCMs) with prescribed ice sheets. This can lead to inconsistencies
between the modeled climate and ice sheets. One way to avoid this problem
would be to model the ice sheets explicitly. Here, we present the first
results from coupled ice sheet–climate simulations for the pre-industrial
times and the LGM.
Our setup consists of the AOVGCM ECHAM5/MPIOM/LPJ bidirectionally coupled
with the Parallel Ice Sheet Model (PISM) covering the Northern Hemisphere.
The results of the pre-industrial and LGM simulations agree reasonably well
with reconstructions and observations. This shows that the model system
adequately represents large, non-linear climate perturbations.
A large part of the drainage of the ice sheets occurs in ice streams. Most
modeled ice stream systems show recurring surges as internal
oscillations. The Hudson Strait Ice Stream surges with an ice volume
equivalent to about 5 m sea level and a recurrence interval of about
7000 yr. This is in agreement with basic expectations for Heinrich events.
Under LGM boundary conditions, different ice sheet configurations imply
different locations of deep water formation. |
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