CMIP6 Simulations With the CMCC Earth System Model (CMCC‐ESM2)

This article introduces the second generation CMCC Earth System Model (CMCC-ESM2) that extends a number of marine and terrestrial biogeochemical processes with respect to its CMIP5 predecessor. In particular, land biogeochemistry was extended wider set carbon pools plant functional types, along prognostic representation nitrogen cycle. The ecosystem reshaped toward an intermediate complexity lower trophic level interactions, including interactive benthic compartment new formulation heterotrophic bacterial population. Details are provided on model setup implementation for different experiments performed as contribution sixth phase Coupled Intercomparison Project. CMCC-ESM2 shows equilibrium climate sensitivity 3.57°C transient response 1.97°C which close CMIP6 multi-model averages. evaluation coupled climate-carbon in historical period against available observational datasets show consistent both physical quantities. However, sink is found be weaker than current global estimates simulated primary production slightly below satellite-based average over recent decades. Future projections coherently prominent warming northern hemisphere intensified precipitations at high latitudes. expected ranges variability oceanic pH oxygen, well soil storage, compare favorably those assessed from other models.