HighResMIP2 Tier 1b: spinup-1950

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This experiment is designed to provide a multidecadal spinup for coupled model simulations. Its final output will serve as initial conditions for the control-1950, hist-1950, and highres-4xCO2 scenarios. The setup follows the same design as HighResMIP1, typically run for 50 years starting from the initial conditions.

For solar and ozone forcing, we suggest using an 11-year climatology centered on 1950 to average the solar cycle. For greenhouse gases (GHG), concentrations can be set to 1950 values as defined in CMIP. A 10-year mean around 1950 (e.g., 1946–1955 or 1950–1959) is recommended for aerosols and volcanic forcing.

For further details, please refer to:
Roberts et al. (2025). High-Resolution Model Intercomparison Project Phase 2 (HighResMIP2) towards CMIP7. Geoscientific Model Development, 18, 1307–1332.

High-Resolution Model Intercomparison Project Phase 2 (HighResMIP2) towards CMIP7.pdf