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| Titel |
Enhanced 20th-century heat transfer to the Arctic simulated in the context of climate variations over the last millennium |
| VerfasserIn |
J. H. Jungclaus, K. Lohmann, D. Zanchettin |
| 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 ; 10, no. 6 ; Nr. 10, no. 6 (2014-12-15), S.2201-2213 |
| Datensatznummer |
250117086
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| Publikation (Nr.) |
 copernicus.org/cp-10-2201-2014.pdf |
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| Zusammenfassung |
| Oceanic heat transport variations, carried by the northward-flowing Atlantic
Water, strongly influence Arctic sea-ice distribution, ocean–atmosphere
exchanges, and pan-Arctic temperatures. Palaeoceanographic reconstructions
from marine sediments near Fram Strait have documented a dramatic increase
in Atlantic Water temperatures over the 20th century, unprecedented in
the last millennium. Here we present results from Earth system model
simulations that reproduce and explain the reconstructed exceptional
Atlantic Water warming in Fram Strait in the 20th century in the
context of natural variability during the last millennium. The associated
increase in ocean heat transfer to the Arctic can be traced back to changes
in the ocean circulation in the subpolar North Atlantic. An interplay
between a weakening overturning circulation and a strengthening subpolar
gyre as a consequence of 20th-century global warming is identified as the
driving mechanism for the pronounced warming along the Atlantic Water path
toward the Arctic. Simulations covering the late Holocene provide a
reference frame that allows us to conclude that the changes during the last
century are unprecedented in the last 1150 years and that they cannot be
explained by internal variability or natural forcing alone. |
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