The MPI-ESM1.2-ER configuration is designed to facilitate research on ocean eddies that are explicitly resolved. The 1950-control simulation, spans 200 years for ocean and 100 years for the atmosphere, forced by fixed-1950 GHG-forcing. This includes fixed orbital parameters, solar irradiance averaged over a solar cycle, greenhouse gas concentrations, and ozone concentrations. The simulation excludes volcanic aerosol forcing and focuses on tropospheric natural aerosols.

                The MPI-ESM1.2-ER climate model includes the following components: 
                aerosol: none, 
                prescribed MACv2-SP, 
                atmos: ECHAM6.3 (spectral T127/L95; 384 × 192 longitude/latitude; 95 levels; top level 0.01 hPa), 
                land: none, 
                landIce: none/prescribed, 
                ocean: MPIOM1.63 (TP6M, approximately 0.1deg; 3602x2394 longitude/latitude; 40 levels; top grid cell 0-6 m), 
                ocnBgchem: none, 
                seaIce: unnamed (thermodynamic (Semtner zero-layer) dynamic (Hibler 79) sea ice model).

                The model was run by the Max Planck Institute for Meteorology, Hamburg 20146, Germany (MPI-M) in native nominal resolutions: 
                aerosol: 100 km, 
                atmos: 100 km, 
                land: none, 
                landIce: none, 
                ocean: 10 km, 
                ocnBgchem: none, 
                seaIce: 10 km.

                MPI-ESM-ER is a coupled climate model that is conducted following the HighResMIP protocol. Atmospheric component (ECHAM6.3) and ocean component (MPIOM) of the MPI-ESM-ER are coupled with a coupling frequency of 1hr (via OASIS3 coupler). MPI-ESM-ER includes dynamic vegetation, and interactive carbon cycle, as well as advanced representations of atmosphere and ocean processes (Stevens et al., 2013).