The following results were derived from time-slice experiments with the ECHAM 4 model for 1 and 2 x CO2 conditions (Wild and Ohmura (1999)), and a transient integration of the MIT model (the REF case described in section 5.2) in 1990 and at the time of CO2 doubling. These runs are not equilibrium simulations and the ocean has not been given sufficient time to fully adjust to the changes in the overlying atmosphere. A more moderate warming than in a doubled CO2 equilibrium simulation can therefore be expected a priori.
The following results show the differences in response of the three melt models when they are subject to a forcing different from the current climate. Detailed results for the current climate and their comparison to observations can be found in Bugnion (1999).