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Introduction

Aspects of the middle atmosphere circulation as simulated by the MAECHAM/CHEM climate system model are evaluated. The model extends form the surface to about 80 km, it consists of the MAECHAM4 general circulation model, GCM, (Manzini and McFarlane, 1998; Manzini and Feichter, 1999) for the thermodynamics and physics of the atmosphere and the CHEM chemical model (Steil et al. 1998, 2000) for the evolution of ozone, H2O as a chemical species, and other relevant chemical species. The CHEM model includes heterogeneous chemistry. The transport scheme for the chemical species is the mass flux SPITFIRE (Rash and M. Lawrence, 1998). Process interactions include the photolysis rate computation (physics to chemistry), the transport of chemical species (dynamics to chemistry), the evolution of radiative active trace gases as ozone, water vapor, CH4 and N20 (chemistry to radiative forcing).