These data represent monthly averaged values of selected variables for the Data Distribution Centre (DDC) of the Intergovernmental Panel on Climate Change (IPCC). (see also http://www.ipcc-data.org/) _ The model output prepared for IPCC Fourth Assessment climate of the 1 percent year CO2 increase experiment (to doubling). _ These datasets are available in netCDF and GRIB format. _ Spinup: 5y coupled spinup with ocean restart file from end of year 305 of a coupled control run (expid c04). GHGs constant: CO2=1.01**(y-1990)*353 ppmv CH4=310 ppb N2O=280pptv CFC11=484pptv CFC12=60pptv HCFC113=15pptv CFC115=5pptv HCFC22=122pptv CCL4=146pptv , (ipcc/sacc values for 1990), solar constant of 1365 W/m**2. CO2 constant after 2060. _ For this experiment there is only one run available. _ Model output data for CMIP3 in higher temporal resolutions and further variables are available in ESGF at https://esgf-node.llnl.gov/search/cmip3/.