Impact of prescribed Arctic sea ice thickness in simulations of the present and future climate |
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| Authors: | Gerhard Krinner Annette Rinke Klaus Dethloff Irina V Gorodetskaya |
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| Institution: | 1. Alfred Wegener Institute for Polar and Marine Research, Potsdam, Germany
2. Laboratoire de Glaciologie et Géophysique de l’Environnement (LGGE), INSU-CNRS and UJF Grenoble, 54 rue Molière, BP 96, 38402, Saint Martin d’Hères Cedex, France
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| Abstract: | This paper describes atmospheric general circulation model climate change experiments in which the Arctic sea-ice thickness
is either fixed to 3 m or somewhat more realistically parameterized in order to take into account essentially the spatial
variability of Arctic sea-ice thickness, which is, to a first approximation, a function of ice type (perennial or seasonal).
It is shown that, both at present and at the end of the twenty-first century (under the SRES-A1B greenhouse gas scenario),
the impact of a variable sea-ice thickness compared to a uniform value is essentially limited to the cold seasons and the
lower troposphere. However, because first-year ice is scarce in the Central Arctic today, but not under SRES-A1B conditions
at the end of the twenty-first century, and because the impact of a sea-ice thickness reduction can be masked by changes of
the open water fraction, the spatial and temporal patterns of the effect of sea-ice thinning on the atmosphere differ between
the two periods considered. As a consequence, not only the climate simulated at a given period, but also the simulated Arctic
climate change over the twenty-first century is affected by the way sea-ice thickness is prescribed. |
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