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| Titel |
Modelling the Isotopic Response to Antarctic Ice Sheet Change During the Last Interglacial |
| VerfasserIn |
Max Holloway, Louise Sime, Joy Singarayer, Julia Tindall, Paul Valdes |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250107065
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| Publikation (Nr.) |
 EGU/EGU2015-6755.pdf |
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| Zusammenfassung |
| Ice sheet changes can exert major control over spatial water isotope variations in Antarctic
surface snow. Consequently a significant mass loss or gain of the West Antarctic Ice Sheet
(WAIS) would be expected to cause changes in the water isotope record across Antarctic ice
core sites. Analysis of sea level indicators for the last interglacial (LIG), around 125 to 128
ka, suggest a global sea level peak 6 to 9 m higher than present. Recent NEEM
Greenland ice core results imply that Greenland likely provided a modest ~2m
contribution towards this global sea level rise. This implies that a WAIS contribution
is necessary to explain the LIG sea level maxima. In addition, Antarctic ice core
records suggest that Antarctic air temperatures during the LIG were up to 6°C
warmer than present. Climate models have been unable to recreate such warmth
when only orbital and greenhouse gas forcing are considered. Thus changes to
the Antarctic ice sheet and ocean circulation may be required to reconcile model
simulations with ice core data. Here we model the isotopic response to differing WAIS
deglaciation scenarios, freshwater hosing, and sea ice configurations using a fully
coupled General Circulation Model (GCM) to help interpret Antarctic ice core
records over the LIG. This approach can help isolate the contribution of individual
processes and feedbacks to final isotopic signals recorded in Antarctic ice cores. |
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