The external forcings for each simulation are held at the level they were at in a parent ScenarioMIP simulation at the time the simulations are branched off. In the case of GHGs, that corresponds to constant concentrations and for anthropogenic aerosols it corresponds to constant emissions. The vegetation is dynamic, but each grid cell has a prescribed crop and pasture fraction based on the conditions of their parent simulations at the point of branching-off. Solar and volcanic forcing are set to the forcings used in the pre-industrial control simulations. All simulations are branched from the first initial condition realisation of the parent ScenarioMIP experiment (r1i1p1f2 in CMIP6 nomenclature).