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Recovery mechanisms of Arctic summer sea ice

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Tietsche,  Steffen
Director’s Research Group OES, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;
IMPRS on Earth System Modelling, MPI for Meteorology, Max Planck Society;

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Notz,  D.
Max Planck Research Group The Sea Ice in the Earth System, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

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Jungclaus,  J. H.
Director’s Research Group OES, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

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Marotzke,  J.
Director’s Research Group OES, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;
C 2 - Climate Change, Predictions, and Economy, Research Area C: Climate Change and Social Dynamics, The CliSAP Cluster of Excellence, External Organizations;

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Citation

Tietsche, S., Notz, D., Jungclaus, J. H., & Marotzke, J. (2011). Recovery mechanisms of Arctic summer sea ice. Geophysical Research Letters, 38: L02707. doi:10.1029/2010GL045698.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-F53F-5
Abstract
We examine the recovery of Arctic sea ice from prescribed ice-free summer conditions in simulations of 21st century climate in an atmosphere-ocean general circulation model. We find that ice extent recovers typically within two years. The excess oceanic heat that had built up during the ice-free summer is rapidly returned to the atmosphere during the following autumn and winter, and then leaves the Arctic partly through increased longwave emission at the top of the atmosphere and partly through reduced atmospheric heat advection from lower latitudes. Oceanic heat transport does not contribute significantly to the loss of the excess heat. Our results suggest that anomalous loss of Arctic sea ice during a single summer is reversible, as the ice-albedo feedback is alleviated by large-scale recovery mechanisms. Hence, hysteretic threshold behavior (or a "tipping point") is unlikely to occur during the decline of Arctic summer sea-ice cover in the 21st century.