The control integration, in which the atmospheric forcing is kept constant, simulates a period over 240 years (1860-2099) in length. Control experiment (CTL): The control integration, in which the atmospheric forcing is kept constant, simulates a period over several 100 years in length. The IPCC Data Distribution Centre (DDC) distributes data of a 220-year period according to the length of the climate change experiments (the greenhouse gas and the greenhoue gas plus sulphate aerosol forcing runs) available from CSIRO. These data represent monthly averaged surface values of selected variables for the IPCC-Data Distribution Centre. (see also https://www.ipcc-data.org/ )