The CESM2 with CMIP5 forcing is a publicly available set of climate model simulations intended to disentangle the role of forcing versus model structure between CESM2 and CESM1 for pre-industrial, 20th and 21st centuries simulations.
The CESM2 has considerable changes relative to the CESM1 both in the model structure and in the forcing. In order to understand these changes and their impact on climate variability and change, simulations with CESM2 but with a forcing similar to CESM1 were performed.
Specifically, the available simulations include:
- A 500-year pre-industrial run
- 7 ensembles for the 1850-2099 period forced by historical/RCP8.5 datasets that are comparable to forcing used in the CESM1 Large Ensemble Simulations
Comparisons of these simulations with the CESM1 Large Ensemble (CESM1-LE) and CESM2 CMIP6 integrations will enable studies to disentangle the role of forcing versus structural model changes in the differences between CESM2 CMIP6 and CESM1-LE runs.
The list of the simulations and their location may be found in the Simulations section.
The Experiment Design section provide details of how to reproduce the simulations including tags, namelists and tuning.