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Revision with unchanged content. Arctic sea ice plays an important role in the global climate system due to its high reflectivity of solar radiance, isolation effects and melting- and freezing pro cesses. Sea ice export through Fram Strait is the largest source of ice ex port from the Arctic into the North Atlantic Ocean. The author uses a global cli mate model to analyze Arctic climate variability with special focus on the Ar ctic sea ice export and its impact on northern hemispheric climate. The Fram Strait sea ice export shows pronounced interannual and decadal va ria bi lity, which is mainly caused by variations of wind stress and sea ice thickness in Fram Strait. The physical mechanisms of these variations are investigated. Large Fram Strait sea ice export events affect oceanic and atmospheric cli mate conditions in the Labrador Sea one and two years later. Hence, Fram Strait sea ice export shows a high potential for predictability of climate in the Labrador Sea. This book is addressed to readers with physical and ma the ma tical knowledge interested in Arctic climate.

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Dr. Torben Koenigk: diploma in meteorology at the University of Kiel, PhD in oceanography at the University of Hamburg, since 2005 postdoctoral position in the Sonderforschungsbereich 512 (Cyclones and Climate System of the North Atlantic Ocean) at the Max-Planck-Institute for Meteorology in Hamburg.

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