(member 2 of 3 ensemble simulations, the original) This ensemble of 3 simulations was performed with the first version of the coupled global model CGCMI. The model is forced by an effective greenhouse forcing corresponding to that observed from 1850 to the present, and a forcing corresponding to an increase of CO2 at a rate of 1% per year thereafter until year 2100. The direct effect of sulphate aerosols is also included by increasing the surface albedo as in Reader and Boer (1998). Details of the model and an analysis of this simulation are given in Boer et al. (1998). These data represent monthly averaged surface values of selected variables for the IPCC-Data Distribution Centre. (see also https://www.ipcc-data.org/ )