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Climate simulations with the global coupled atmosphere-ocean model ECHAM2/OPYC Part I: present-day climate and ENSO events
Authors:Frank Lunkeit  Robert Sausen  Josef M Oberhuber
Institution:(1) Meteorologisches Institut der Universität Hamburg, Bundesstraße 55, D-20146 Hamburg, Germany;(2) Deutsche Forschungsanstalt für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, D-82234 Weßling, Germany;(3) Deutsches Klimarechenzentrum (DKRZ), Bundesstraße 55, D-20146 Hamburg, Germany
Abstract:In this study the global coupled atmosphere-ocean general circulation model ECHAM2/OPYC and its performance in simulating the present-day climate is presented. The model consists of the T21-spectral atmosphere general circulation model ECHAM2 and the ocean general circulation model OPYC with a resolution corresponding to a T42 Gaussian grid, with increasing resolution towards the equator. The sea-ice is represented by a dynamic thermodynamic sea-ice model with rheology. Both models are coupled using the flux correction technique. With the coupled model ECHAM2/OPYC a 210-year integration under present-day greenhouse gas conditions has been performed. The coupled model simulates a realistic mean climate state, which is close to the observations. The model generates several ENSO events without external forcing. Using traditional and advanced (POP-technique) methods these ENSO events have been analyzed. The results are consistent with the ldquodelayed action oscillatorrdquo theory. The model simulates both a tropical and an extra-tropical response to ENSO, which are in good agreement with observations.
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