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Sea ice induced changes in ocean circulation during the Eemian

Climate Dynamics volume 35, pages 1361–1371 (2010)Cite this article

Abstract

We argue that Arctic sea ice played an important role during early stages of the last glacial inception. Two simulations of the Institut Pierre Simon Laplace coupled model 4 are analyzed, one for the time of maximum high latitude summer insolation during the last interglacial, the Eemian, and a second one for the subsequent summer insolation minimum, at the last glacial inception. During the inception, increased Arctic freshwater export by sea ice shuts down Labrador Sea convection and weakens overturning circulation and oceanic heat transport by 27 and 15%, respectively. A positive feedback of the Atlantic subpolar gyre enhances the initial freshening by sea ice. The reorganization of the subpolar surface circulation, however, makes the Atlantic inflow more saline and thereby maintains deep convection in the Nordic Seas. These results highlight the importance of an accurate representation of dynamic sea ice for the study of past and future climate changes.

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Acknowledgments

We gratefully acknowledge Oliver Marti for technical assistance as well as discussions with Tor Eldevik, Bjørg Risebrobakken, Tore Furevik and Uwe Mikolajewicz. We further thank two anonymous referees whose reviews improved our earlier manuscript. A. Born was funded by the Marie Curie Actions project NICE (MRTN-CT-2006-036127). Computer time was provided by the Centre National de la Recherche Scientifique (IDRIS computing center) and the Commissariat à l’Energie Atomique (CCRT computing center). This work is a contribution to the French ANR blanc “PICC”. This is publication number A260 from the Bjerknes Centre for Climate Research.

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Authors and Affiliations

  1. Bjerknes Centre for Climate Research, Allegaten 55, 5007, Bergen, Norway

    Andreas Born & Kerim H. Nisancioglu

  2. Geophysical Institute, University of Bergen, Allegaten 70, Bergen, Norway

    Andreas Born

  3. IPSL/LSCE, Unité mixte CEA-CNRS-UVSQ, Gif sur Yvette, France

    Pascale Braconnot

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  1. Andreas Born
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  2. Kerim H. Nisancioglu
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Correspondence to Andreas Born.

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Born, A., Nisancioglu, K.H. & Braconnot, P. Sea ice induced changes in ocean circulation during the Eemian. Clim Dyn 35, 1361–1371 (2010). https://doi.org/10.1007/s00382-009-0709-2

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Keywords

  • Sea ice
  • Ocean circulation
  • Eemian
  • Glacial inception
  • Subpolar gyre
  • North Atlantic