These data represent 6 hourly and 12 hourly instantaneous values of selected variables for ENSEMBLES (http://www.ensembles-eu.org). The list of output variables can be found in: http://ensembles.wdc-climate.de/output-variablesThe model output was prepared for the IPCC Fourth Assessment climate of the 1%year CO2 increase experiment (to doubling). The simulation is initialized in the same year as experiment 20C_1, with an annual CO2 increase of 1% until doubling in 1930. Between 1931 and 2080 the CO2 concentration was held constant. All other concentrations remain at their preindustrial levels (nominally year 1860). These datasets are available in netCDF format. The dataset names are composed of - centre/model acronym (e.g. MPEH5: Max-Planck-Institute/Echam5) - scenario acronym (e.g. SRA2: SRES A2) - run number (e.g. 1: run 1) - time interval (MM:monthly mean, DM:daily mean, DC:diurnal cycle, 6H:6 hourly, 12h:12hourly) - variable acronym [with level value] (e.g. hur850: relative humidity, 850 hPa) --> example: MPEH5_SRA2_1_MM_hur850 For this experiment 3 ensemble runs were carried out. Model output data for CMIP3 in higher temporal resolutions and further variables are available in ESGF at https://esgf-node.llnl.gov/search/cmip3/. Technical data to this experiment: The experiment used ECHAM5.2.02a (T63L31) coupled to MPI-OM Vers. 1.0 (GR1.5L40) and was run on a NEC-SX (hurrikan). The output from the model run: hurrikan.dkrz.de:/ut/k/k204076/EXP000/run008