The Max Planck Institute for Meteorology (MPI-M) Grand Ensemble (MPI-GE) is the largest ensemble of a single state-of-the-art comprehensive climate model currently available. The Grand Ensemble consists of five Large Ensembles of 100 simulations each under different forcing scenarios. This ensemble allows the separation of the forced signal from the model internal variability. It allows us to address questions that could not be answered in the past, such as: Does internal variability change under different forcing conditions? The Figure to the bottom shows many possible realisations of the Earth under multiple scenarios.
Figure credit: Michael Boettinger (DKRZ) and Jochem Marotzke (MPI-M)