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Climate Dynamics

, Volume 40, Issue 3–4, pp 983–995 | Cite as

Wind-stress feedback amplification of abrupt millennial-scale climate changes

  • Olivier Arzel
  • Matthew H. England
Article

Abstract

The influence of changes in surface wind-stress on the properties (amplitude and period) and domain of existence of thermohaline millennial oscillations is studied by means of a coupled model of intermediate complexity set up in an idealized spherical sector geometry of the Atlantic basin. Using the atmospheric CO2 concentration as the control parameter, bifurcation diagrams of the model are built to show that the influence of wind-stress changes on glacial abrupt variability is threefold. First, millennial-scale oscillations are significantly amplified through wind-feedback-induced changes in both northern sea ice export and oceanic heat transport. Changes in surface wind-stress more than double the amplitude of the strong warming events that punctuate glacial abrupt variability obtained under prescribed winds in the model. Second, the average duration of both stadials and interstadials is significantly lengthened and the temporal structure of observed variability is better captured under interactive winds. Third, the generation of millennial-scale oscillations is shown to occur for significantly colder climates when wind-stress feedback is enabled. This behaviour results from the strengthening of the negative temperature-advection feedback associated with stronger northward oceanic heat transport under interactive winds.

Keywords

Dansgaard-Oeschger events Atlantic Meridional Overturning Circulation Stability properties Wind-stress feedback 

Notes

Acknowledgments

We wish to thank Alain Colin de Verdière and Valérie Masson-Delmotte for comments on a first draft of this manuscript. 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. This study was supported in part by the Australian Research Council.

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  1. 1.Laboratoire de Physique des Océans (LPO)Université de Bretagne OccidentaleBrestFrance
  2. 2.Climate Change Research Centre (CCRC)The University of New South WalesSydneyAustralia

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