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| Titel |
Modeling Northern Hemisphere ice-sheet distribution during MIS 5 and MIS 7 glacial inceptions |
| VerfasserIn |
F. Colleoni, S. Masina, A. Cherchi, A. Navarra, C. Ritz, V. Peyaud, B. Otto-Bliesner |
| 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. 1 ; Nr. 10, no. 1 (2014-02-07), S.269-291 |
| Datensatznummer |
250116910
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| Publikation (Nr.) |
 copernicus.org/cp-10-269-2014.pdf |
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| Zusammenfassung |
| The present manuscript compares Marine Isotope Stage 5 (MIS 5,
125–115 kyr BP) and MIS 7 (236–229 kyr BP) with the aim to investigate
the origin of the difference in ice-sheet growth over the Northern Hemisphere
high latitudes between these last two inceptions. Our approach combines a low
resolution coupled atmosphere–ocean–sea-ice general circulation model and a
3-D thermo-mechanical ice-sheet model to simulate the state of the ice sheets
associated with the inception climate states of MIS 5 and MIS 7. Our results
show that external forcing (orbitals and GHG) and sea-ice albedo feedbacks
are the main factors responsible for the difference in the land-ice initial
state between MIS 5 and MIS 7 and that our cold climate model bias impacts
more during a cold inception, such as MIS 7, than during a warm inception,
such as MIS 5. In addition, if proper ice-elevation and albedo feedbacks are
not taken into consideration, the evolution towards glacial inception is
hardly simulated, especially for MIS 7. Finally, results highlight that while
simulated ice volumes for MIS 5 glacial inception almost fit with
paleo-reconstructions, the lack of precipitation over high latitudes,
identified as a bias of our climate model, does not allow for a proper
simulation of MIS 7 glacial inception. |
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