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Modelling the Stratosphere in Coupled Atmosphere Ocean Models: Systematic Changes in Mean Climate

Modelling the Stratosphere in Coupled Atmosphere Ocean Models: Systematic Changes in Mean Climate

Manzini, E.
(INGV-CMCC, Bologna, Italy; manzini@bo.ingv.it)

M.A. Giorgetta, E. Roeckner, and M. Esch
(MPI, Hamburg, Germany)

The systematic influence of the stratosphere on the modelling of the coupled atmosphere ocean climate system is investigated by analyzing two sets of simulations. The first set consists of two AMIP simulations, one with a low top (ECHAM5) and the other with a high top (MAECHAM5) atmospheric general circulation model. For the second set, two simulations are considered: one with the low and the other with the high top atmosphere model, respectively coupled to an ocean general circulation model. The AMIP simulations are 21 years long. The coupled simulations are each 100 year long. By intercomparing the AMIP and coupled simulations, a general increase in the tropospheric temperature is found for the high top model. The causes and the direct and indirect (via the coupling to the ocean) effects of the atmospheric model top on the simulated mean climate are thereafter assessed.