HR: 1340h
AN: A13E-1615    [Abstracts]
TI: Impact of the Projected Future Sea Ice Concentrations on the Atmospheric Circulation
AU: * Bader, J
EM: juergen.bader@bjerknes.uib.no
AF: Bjerknes Centre for Climate Research, Allegaten 55, Bergen, 5007, Norway
AU: Seierstad, I
EM: ivar@gfi.uib.no
AF: Geophysical Institute, Allegaten 70, Bergen, 5007, Norway
AB: The observed decline of Arctic sea ice cover and the projected future reduction raise the question of how reduced Artic sea ice will influence/feed back on the climate. Using the projected future sea ice concentration by the coupled atmosphere ocean sea ice model ECHAM5/MPI, we investigate the impact of the changed sea ice cover on the atmospheric circulation by conducting atmospheric general circulation model (AGCM) experiments. We force the AGCM ECHAM5 by the current seasonal cycle of arctic sea ice and the projected future arctic seasonal cycle. The goal of this experiment is to determine the impact of the Artic sea ice reduction - that is projected in the next 100 years - on the atmospheric circulation. We find a significant reduction in storminess. The response to sea ice concentration changes differs strongly even on intraseasonal time scales.
DE: 0750 Sea ice (4540)
DE: 3305 Climate change and variability (1616, 1635, 3309, 4215, 4513)
DE: 3337 Global climate models (1626, 4928)
DE: 3349 Polar meteorology
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting