The sulphate aerosol (direct effect), greenhouse gas and ozone experiment (GSDIO): The forcing includes not only the greenhouse gas forcing described with the "greenhouse run" but also the direct radiative effect and the indirect cloud effect of historic sulphate aerosol concentrations from 1860 to 1990 and a scenario of sulphate aerosol concentrations from 1990 to 2049. The sulphate aerosol concentrations are calculated in the ECHAM4 model from the sulphur emissions in the IS92a scenario. Additionally the troposheric ozone has been modified according to IS92a. The model output raw-data can be found on schauer.dkrz.de:/pf/m/m214002/EXP700/run723/Yyyy/22723sul2_yyymm.01 (yyy year; mm month).