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North Atlantic Oscillation response to anomalous Indian Ocean SST in a coupled GCM

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Geophysical Research Abstracts, Vol. 7, 08921, 2005 SRef-ID: 1607-7962/gra/EGU05-A-08921

© European Geosciences Union 2005

North Atlantic Oscillation response to anomalous Indian Ocean SST in a coupled GCM

J. Bader (1) and M. Latif (2)

(1) Max-Planck-Institute for Meteorology, Hamburg, Germany, (2) Leibniz-Institute for Marine Sciences at the University of Kiel, Kiel, Germany

The dominant pattern of atmospheric variability in the North Atlantic sector is the North Atlantic Oscillation (NAO). Since the 1970s the NAO is well characterized by a trend towards it’s positive phase. Recent atmospheric general circulation model studies have linked this trend to a progressive warming of the Indian Ocean. Unfortunately, a clear mechanism – responsible for the change of the NAO – could not be given.

This study provides further details of the NAO response to Indian Ocean sea surface temperature (SST) anomalies. We do this by conducting experiments with a coupled ocean-atmosphere general circulation model (OAGCM). We develop a hypothesis of how the Indian Ocean impacts the NAO.

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