A.Enzian would like to thank the members of the Edinburgh Parallel Computing Centre for their hospitality during a research visit funded by the European Union (programme Human Capital and Mobility). Many useful suggestions from G. Smith led to an improvement of the parallelisation of the model. The computation of this work were performed on the CRAY T3D of the Institut du Développement des Ressources en Informatique Scientifique (Orsay/France) of CNRS. Part of this work was supported by the French Programme National de Planétologie and the Centre National d'Etudes Spatiales. The authors acknowledge useful comments from the referee Dr. G. Tancredi.
© European Southern Observatory (ESO) 1997
Online publication: July 3, 1998