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| Titel |
Sensitivity of the North Atlantic climate to Greenland Ice Sheet melting during the Last Interglacial |
| VerfasserIn |
P. Bakker, C. J. Meerbeeck, H. Renssen |
| 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 ; 8, no. 3 ; Nr. 8, no. 3 (2012-06-01), S.995-1009 |
| Datensatznummer |
250005590
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| Publikation (Nr.) |
 copernicus.org/cp-8-995-2012.pdf |
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| Zusammenfassung |
| During the Last Interglacial (LIG; ~130 000 yr BP), part of the
Greenland Ice Sheet (GIS) melted due to a warmer than present-day climate.
However, the impact of this melting on the LIG climate in the North Atlantic
region is relatively unknown. Using the LOVECLIM Earth system model of
intermediate complexity, we have systematically tested the sensitivity of the
LIG climate to increased freshwater runoff from the GIS. In addition,
experiments have been performed to investigate the impact of an idealized
reduction of both surface elevation and extent of the GIS on the LIG
climate. Based on changes in the maximum sea-ice cover and the strength of
the overturning circulation, three regimes have been identified, which are
characterized by a specific pattern of surface temperature change in the
North Atlantic region. By comparing the simulated deep ocean circulation with
proxy-based reconstructions, the most realistic simulated climate could be
discerned. The resulting climate is characterized by a shutdown of deep
convection and a subsequent ~4 °C cooling in the Labrador
Sea. Furthermore, a cooling of ~1 °C over the North
Atlantic Ocean between 40° N and 70° N is seen. The
prescribed reduction in surface elevation and extent of the GIS results in a
local warming of up to 4 °C and amplifies the freshwater-forced reduction in deep convection and the resultant cooling in the Nordic
Seas. A further comparison of simulated summer temperatures with both
continental and oceanic proxy records reveals that the partial melting of
the GIS during the LIG could have delayed maximum summer temperatures in the
western part of the North Atlantic region relative to the insolation
maximum. |
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