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| Titel |
The mechanism behind internally generated centennial-to-millennial scale climate variability in an earth system model of intermediate complexity |
| VerfasserIn |
T. Friedrich, A. Timmermann, L. Menviel, O. Elison Timm, A. Mouchet, D. M. Roche |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 3, no. 2 ; Nr. 3, no. 2 (2010-08-25), S.377-389 |
| Datensatznummer |
250000946
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| Publikation (Nr.) |
 copernicus.org/gmd-3-377-2010.pdf |
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| Zusammenfassung |
| The mechanism triggering centennial-to-millennial-scale variability of the
Atlantic Meridional Overturning Circulation (AMOC) in the earth system model
of intermediate complexity LOVECLIM is investigated. It is found that for
several climate boundary conditions such as low obliquity values
(~22.1°) or LGM-albedo, internally generated
centennial-to-millennial-scale variability occurs in the North Atlantic
region. Stochastic excitations of the density-driven overturning circulation
in the Nordic Seas can create regional sea-ice anomalies and a subsequent
reorganization of the atmospheric circulation. The resulting remote
atmospheric anomalies over the Hudson Bay can release freshwater pulses into
the Labrador Sea and significantly increase snow fall in this region leading
to a subsequent reduction of convective activity. The millennial-scale AMOC
oscillations disappear if LGM bathymetry (with closed Hudson Bay) is
prescribed or if freshwater pulses are suppressed artificially. Furthermore,
our study documents the process of the AMOC recovery as well as the global
marine and terrestrial carbon cycle response to
centennial-to-millennial-scale AMOC variability. |
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