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| Titel |
Coupled regional climate-ice-sheet simulation shows limited Greenland ice loss during the Eemian |
| VerfasserIn |
M. M. Helsen, W. J. Berg, R. S. W. Wal, M. R. Broeke, J. Oerlemans  |
| 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 ; 9, no. 4 ; Nr. 9, no. 4 (2013-08-02), S.1773-1788 |
| Datensatznummer |
250085198
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| Publikation (Nr.) |
 copernicus.org/cp-9-1773-2013.pdf |
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| Zusammenfassung |
| During the last interglacial period (Eemian, 130–115 kyr BP)
eustatic global sea level likely peaked at > 6 m above the
present-day level, but estimates of the contribution of the Greenland Ice
Sheet vary widely. Here we use an asynchronously two-way-coupled regional
climate–ice-sheet model, which includes physically realistic feedbacks
between the changing ice sheet topography and climate forcing. Our simulation
results in a contribution from the Greenland Ice Sheet to the Eemian sea
level highstand between 1.2 and 3.5 m, with a most likely value of 2.1 m.
Simulated Eemian ice loss in Greenland is dominated by the rapid retreat of
the southwestern margin; two-thirds of the ice loss occurred south of
70° N. The southern dome survived the Eemian and remained connected
to the central dome. Large-scale ice sheet retreat is prevented in areas with
high accumulation. Our results broadly agree with ice-core-inferred elevation
changes and marine records, but it does not match with the ice-core-derived
temperature record from northern Greenland. During maximum Eemian summertime
insolation, Greenland mass loss contributed ~ 0.5 m kyr−1 to sea
level rise, 24% of the reconstructed total rate of sea level rise. Next to
that, a difference of > 3 m remains between our maximum estimate of the
Greenland contribution and the reconstructed minimum value of the global
eustatic Eemian highstand. Hence, the Antarctic Ice Sheet must also have
contributed significantly to this sea level highstand. |
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