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| Titel |
Simulating the Dansgaard-Oeschger Continuum - mechanisms, patterns, timing |
| VerfasserIn |
Axel Timmermann, Laurie Menviel, Tobias Friedrich |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250093493
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| Publikation (Nr.) |
 EGU/EGU2014-8270.pdf |
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| Zusammenfassung |
| This presentation will discuss new insights into dynamics of Dansgaard-Oeschger variability
by analyzing a recently performed transient global 3-dimensional intermediate complexity
Earth system model hindcast simulation which covers the period 50kaB.P. to 30kaB.P.
The model was 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 Hemisphere ice-volume on
millennial timescales. Together these forcing generate a realistic global climate
trajectory, as will be demonstrated by an extensive model/paleo data comparison.
The results presented in this talk are consistent with the notion 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
(Dansgaard-Oeschger and Heinrich events) seen in paleorecords across the globe. |
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