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A 1260-year control integration with the coupled ECHAM1/LSG general circulation model

By J.S. von (Hamburg Univ. (Germany). Meteorologisches Inst.) Storch, BC (Canada)) Victoria V. (Canadian Climate Centre Kharin, E. (GKSS-Forschungszentrum Geesthacht GmbH (Germany). Inst. fuer Hydrophysik) Zorita, H. von Storch, Hamburg (Germany)) D. (Max-Planck-Institut fuer Meteorologie Schriever, G.C. Hegerl, Hamburg (Germany)) U. (Deutsches Klimarechenzentrum (DKRZ) Cubasch and Hamburg (Germany) Max-Planck-Institut fuer Meteorologie


A 1260-year integration generated by the ECHAM1/LSG coupled atmosphere-ocean general circulation model is analyzed in this paper. The analysis focuses on the time evolution of the model atmosphere and the model ocean, and on the variations of the final quasi-stationary atmosphere-ocean system. The evolution of the coupled system is affected by the globally integrated fluxes of heat and fresh water, the coupling shock induced by different types of fluxes prior to and after the coupling, and the insufficient spin-up of the deep ocean prior to the coupling. It is suggested that the flux correction with its unsatisfactory formulation over sea ice areas does not play the crucial role in causing the initial drift of the system. The main question concerning the atmospheric variations is whether the spatial structures of variations on short time scales are similar to those on long time scales. The answer to this question is yes. The questions concerning the oceanic variations are what are their dominant modes and to what extent are variations of different parts of the oceanic circulation related to each other. It is shown that the dominant oceanic variations are located in the North Pacific and at the southern flank of the mean position of the Antarctic Circumpolar Current and in the areas where deep water from three oceans meets the Antarctic Circumpolar Current. A correlation analysis indicates further that an anomalous outflow from (inflow into) the deep Atlantic is related to an anomalous outflow from (inflow into) the deep Indian Ocean and an anomalous eastward (westward) flow along the Antarctic coast. (orig.)Available from TIB Hannover: RR 1347(198) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Year: 1996
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