A dynamical link between the Arctic and the global climate system

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K. Dethloff, A. Rinke, A. Benkel, M. Køltzow, E. Sokolova, S. Kumar Saha, D. Handorf, W. Dorn, B. Rockel, H. von Storch, J. E. Haugen, L. P. Røed, E. Roeckner, J. H. Christensen, M. Stendel

By means of simulations with a global coupled AOGCM it is shown that changes in the polar energy sink region can exert a strong influence on the mid- and high-latitude climate by modulating the strength of the mid-latitude westerlies and storm tracks. It is found, that a more realistic sea-ice and snow albedo treatment changes the ice-albedo feedback and the radiative exchange between the atmosphere and the ocean-sea-ice system. The planetary wave energy fluxes in the middle troposphere of mid-latitudes between 30 and 50°N are redistributed, which induces perturbations in the zonal and meridional planetary wave trains from the tropics over the mid-latitudes into the Arctic. It is shown, that the improved parameterization of Arctic sea-ice and snow albedo can trigger changes in the Arctic and North Atlantic Oscillation pattern with strong implications for the European climate.

TidsskriftGeophysical Research Letters
Udgave nummer3
StatusUdgivet - 16 feb. 2006

ID: 186941985