IMIS | Flanders Marine Institute
 

Flanders Marine Institute

Platform for marine research

IMIS

Publications | Institutes | Persons | Datasets | Projects | Maps
[ report an error in this record ]basket (0): add | show Print this page

The mechanism behind internally generated centennial-to-millennial scale climate variability in an earth system model of intermediate complexity
Friedrich, T.; Timmermann, A.; Menviel, L.; Timm, O.E.; Mouchet, A.; Roche, D.M. (2010). The mechanism behind internally generated centennial-to-millennial scale climate variability in an earth system model of intermediate complexity. Geosci. Model Dev. 3(2): 377-389. https://hdl.handle.net/10.5194/gmd-3-377-2010
In: Geoscientific Model Development. Copernicus Publications: Göttingen. ISSN 1991-959X; e-ISSN 1991-9603, more
Peer reviewed article  

Available in  Authors 

Authors  Top 
  • Friedrich, T.
  • Timmermann, A.
  • Menviel, L.
  • Timm, O.E.
  • Mouchet, A., more
  • Roche, D.M.

Abstract
    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 (similar to 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.

All data in the Integrated Marine Information System (IMIS) is subject to the VLIZ privacy policy Top | Authors