The atmosphere-ocean general circulation model ECHAM3/LSG is used for climate change and climate variability studies. For this climate change integration, the CO2 concentration from 1880 to 2084 were prescribed. Up to 1985 the concentration followswere taken from observation Schoenwiese et al., 1990) and for the following years the IPCC scenario A (Business as Usual, Houghton et al., 1990) was applied. The models ECHAM3 and LSG are described in the DKRZ reports No.6 and No.2, respectively. These data represent monthly averaged surface values of selected variables for the IPCC-Data Distribution Centre. (see also https://www.ipcc-data.org/ )