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| Titel |
Hindcasting the continuum of Dansgaard-Oeschger variability: mechanisms, patterns and timing |
| VerfasserIn |
L. Menviel, A. Timmermann, T. Friedrich, M. H. England |
| 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. 1 ; Nr. 10, no. 1 (2014-01-14), S.63-77 |
| Datensatznummer |
250116895
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| Publikation (Nr.) |
 copernicus.org/cp-10-63-2014.pdf |
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| Zusammenfassung |
| Millennial-scale variability associated with Dansgaard–Oeschger events is
arguably one of the most puzzling climate phenomena ever discovered in
paleoclimate archives. Here, we set out to elucidate the underlying dynamics
by conducting a transient global hindcast simulation with a 3-D
intermediate complexity earth system model covering the period 50 to
30 ka BP. The model is forced by time-varying external boundary conditions
(greenhouse gases, orbital forcing, and ice-sheet orography and albedo) and
anomalous North Atlantic freshwater fluxes, which mimic the effects of
changing northern hemispheric ice volume on millennial timescales. Together
these forcings generate a realistic global climate trajectory, as
demonstrated by an extensive model/paleo data comparison. Our results are
consistent with the idea that variations in ice-sheet calving and subsequent
changes of the Atlantic Meridional Overturning Circulation were the main
drivers for the continuum of glacial millennial-scale variability seen in
paleorecords across the globe. |
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