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  • Seierstad, I.A., and J. Bader, Impact of a Projected Future Arctic Sea Ice Reduction on Extratropical Storminess and the NAO. Climate Dynamics. Accepted.

The impact of a reduced Arctic sea ice cover on wintertime extratropical storminess is investigated by conducting atmospheric general circulation model (AGCM)
experiments. The AGCM ECHAM5 is forced by the present and a projected future seasonal cycle of Arctic sea ice. In the experiment with projected sea-ice concentrations
significant reductions in storminess were found during December and January in both midlatitudes and towards the Arctic. However, a substantially larger reduction in e
xtratropical storminess was found in March, despite a smaller change in surface energy fluxes in March than in the other winter months. The projected decrease in stor
miness is also related to the negative phase of the North Atlantic Oscillation (NAO). The March response is consistent with a forcing from transient and quasi-stationa
ry eddies associated with negative NAO events. The greater sensitivity to sea-ice anomalies in late winter sets this study apart from earlier ones.


Last Updated: 2008-08-21

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