These data represent daily values (daily mean, instantaneous daily output) of selected variables for ENSEMBLES (http://www.ensembles-eu.org). List of output variables: http://ensembles.wdc-climate.de/output-variables. The model output corresponds to the IPCC AR4 "climate of the 20th Century experiment (20C3M)". The 20th century simulation (1870-2000) is forced with changes of greenhouse gas concentations (CO2, CH4, N2O, CFC-11* and CFC-12), ozone and sulfate aerosols. The datasets are available in netCDF format. The dataset names are composed of - centre/model acronym (INGVSX: Istituto Nazionale di Geofisica e Vulcanologia / SINTEX-G) - scenario acronym (20C3M) - run number (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. hus850: specific humidity, 850 hPa) example: INGVSX_20C3M_1_DM_hus850 For model output data in higher temporal resolution and more variables contact Antonella Sanna. Technical data to this experiment: The model, named SINTEX-G (SXG), is an evolution of the SINTEX-F model (Gualdi et al., 2003a, 2003b; Guilyardi et al., 2003, Luo et al. 2004). The ocean component is OPA 8.2 (Madec et al., 1999) with the ORCA2 configuration: 2x2 degrees cos(latitude) with increased meridional resolutions to 0.5 degree near the equator, 31 vertical levels. The evolution of the sea-ice is described by the LIM (Louvain-La-Neuve sea-ice model; Fichefet and Morales Maqueda, 1997, 1999), which is a thermodynamic-dynamic snow sea-ice model. The atmospheric component is ECHAM4 (Roeckner, 1996) with a T106 horizontal resolution (about 1.125x1.125 degrees) and 19 hybrid sigma-pressure levels. A mass flux scheme (Tiedtke, 1989) is applied for cumulus convection with modifications for penetrative convection according to Nordeng (1994). The coupling information, without flux corrections, is exchanged every 1.5 hours by means of the OASIS 2.4 coupler (Valcke et al., 2000).