MPI-ESM model (T31 resolution) v. 1.2: ramp forcing experiment with 1% CO2 concentration increase every year until doubling with respect to pre-industrial values.

                A ramp forcing experiment with linear increase in CO2 concentrations by 1% every year, starting from t=0: when doubled concentration is achieved, the concentration is kept steady until the end of the run (1000 years). The experiment is performed with MPI-ESM model, coarse resolution (CR: T31). It consists of an ensemble with 20 runs, starting from a set of perturbed initial conditions representative of pre-industrial CO2 levels (same as for the 2xCO2abrupt experiment, see doi:10.26050/WDCC/2xCO2abrupt). The experiment is aimed as a testbed for the Green’s functions computed via the 2xCO2abrupt experiment. This is a model application of the linear response theory, as described in Lembo et al. 2020.