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| Titel |
A volcanically triggered regime shift in the subpolar North Atlantic Ocean as a possible origin of the Little Ice Age |
| VerfasserIn |
C. F. Schleussner, G. Feulner |
| 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. 3 ; Nr. 9, no. 3 (2013-06-25), S.1321-1330 |
| Datensatznummer |
250018069
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| Publikation (Nr.) |
 copernicus.org/cp-9-1321-2013.pdf |
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| Zusammenfassung |
| Among the climatological events of the last millennium, the Northern
Hemisphere Medieval Climate Anomaly succeeded by the Little Ice Age are of
exceptional importance. The origin of these regional climate anomalies
remains a subject of debate and besides external influences like solar and
volcanic activity, internal dynamics of the climate system might have also
played a dominant role. Here, we present transient last millennium
simulations of the fully coupled model of intermediate complexity Climber
3α forced with stochastically reconstructed wind-stress fields. Our
results indicate that short-lived volcanic eruptions might have triggered a
cascade of sea ice–ocean feedbacks in the North Atlantic, ultimately
leading to a persistent regime shift in the ocean circulation. We find that
an increase in the Nordic Sea sea-ice extent on decadal timescales as a
consequence of major volcanic eruptions in our model leads to a spin-up of
the subpolar gyre and a weakened Atlantic meridional overturning circulation,
eventually causing a persistent, basin-wide cooling. These results highlight
the importance of regional climate feedbacks such as a regime shift in the
subpolar gyre circulation for understanding the dynamics of past and future
climate. |
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