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Climate Dynamics

, Volume 39, Issue 1–2, pp 259–275 | Cite as

Abrupt millennial variability and interdecadal-interstadial oscillations in a global coupled model: sensitivity to the background climate state

  • Olivier Arzel
  • Matthew H. England
  • Alain Colin de Verdière
  • Thierry Huck
Article

Abstract

The origin and bifurcation structure of abrupt millennial-scale climate transitions under steady external solar forcing and in the absence of atmospheric synoptic variability is studied by means of a global coupled model of intermediate complexity. We show that the origin of Dansgaard-Oeschger type oscillations in the model is caused by the weaker northward oceanic heat transport in the Atlantic basin. This is in agreement with previous studies realized with much simpler models, based on highly idealized geometries and simplified physics. The existence of abrupt millennial-scale climate transitions during glacial times can therefore be interpreted as a consequence of the weakening of the negative temperature-advection feedback. This is confirmed through a series of numerical experiments designed to explore the sensitivity of the bifurcation structure of the Atlantic meridional overturning circulation to increased atmospheric CO2 levels under glacial boundary conditions. Contrasting with the cold, stadial, phases of millennial oscillations, we also show the emergence of strong interdecadal variability in the North Atlantic sector during warm interstadials. The instability driving these interdecadal-interstadial oscillations is shown to be identical to that found in ocean-only models forced by fixed surface buoyancy fluxes, that is, a large-scale baroclinic instability developing in the vicinity of the western boundary current in the North Atlantic. Comparisons with modern observations further suggest a physical mechanism similar to that driving the 30–40 years time scale associated with the Atlantic multidecadal oscillation.

Keywords

Millennial and interdecadal variability paleoclimate Dansgaard-Oeschger events Atlantic meridional overturning circulation 

Notes

Acknowledgments

We are grateful to V. Masson-Delmotte for her helpful comments on the manuscript. This research was supported by the Australian Research Council. The authors are grateful to the University of Victoria for supplying us the model. All computations were done on the Linux cluster Tensor at the University of New South Wales in Sydney, Australia. Use of these computing facilities is gratefully acknowledged.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Olivier Arzel
    • 1
    • 2
  • Matthew H. England
    • 1
  • Alain Colin de Verdière
    • 2
  • Thierry Huck
    • 2
  1. 1.Climate Change Research Centre (CCRC)The University of New South WalesSydneyAustralia
  2. 2.Laboratoire de Physique des Océans (LPO)Université de Bretagne OccidentaleBrestFrance

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