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| Titel |
Investigating the evolution of major Northern Hemisphere ice sheets during the last glacial-interglacial cycle |
| VerfasserIn |
S. Bonelli, S. Charbit, M. Kageyama, M.-N. Woillez, G. Ramstein, C. Dumas, A. Quiquet |
| 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 ; 5, no. 3 ; Nr. 5, no. 3 (2009-07-10), S.329-345 |
| Datensatznummer |
250002537
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| Publikation (Nr.) |
 copernicus.org/cp-5-329-2009.pdf |
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| Zusammenfassung |
A 2.5-dimensional climate model of intermediate complexity, CLIMBER-2, fully
coupled with the GREMLINS 3-D thermo-mechanical ice sheet model is
used to simulate the evolution of major Northern Hemisphere ice sheets
during the last glacial-interglacial cycle and to investigate the ice sheets
responses to both insolation and atmospheric CO2 concentration. This
model reproduces the main phases of advance and retreat of Northern
Hemisphere ice sheets during the last glacial cycle, although the amplitude
of these variations is less pronounced than those based on sea level
reconstructions. At the last glacial maximum, the simulated ice volume is
52.5×1015 m3 and the spatial distribution of both the American
and Eurasian ice complexes is in reasonable agreement with observations,
with the exception of the marine parts of these former ice sheets.
A set of sensitivity studies has also been performed to assess the
sensitivity of the Northern Hemisphere ice sheets to both insolation and
atmospheric CO2. Our results suggest that the decrease of summer
insolation is the main factor responsible for the early build up of the
North American ice sheet around 120 kyr BP, in agreement with benthic
foraminifera δ18O signals. In contrast, low insolation and low
atmospheric CO2 concentration are both necessary to trigger a
long-lasting glaciation over Eurasia. |
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