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last modified Jul 02, 2020 09:41 AM
CNRM-ESM model of CNRM-CERFACS (National Centre for Meteorological Research and Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique)

CNRM-ESM2-1 is the Earth system model of CNRM of second generation as developped by the CNRM/CERFACS modelling group. It derives from the physical-dynamical core of the ocean-atmosphere coupled climate model CNRM-CM6-1. CNRM-ESM2-1 accounts for a range of couplings, between ‘physical’ and ‘Earth system (ES)’ components. As shown in Figure 1, these latter are enabled by the inclusion of interactive atmospheric chemistry (REPROBUS) and aerosols (TACTIC) as well as interactive land and ocean carbon cycles (ISBA-CTRIP and PISCES, respectively).

CNRM-ESM2-1 provides a first attempt to bound the global carbon cycle by resolving the exchange of carbon not only between the atmosphere, land and ocean but also between land and ocean though the aquatic continuum as simulated by ISBA-CTRIP. As a consequence, CNRM-ESM2-1 can be run either with prescribed atmospheric CO2 concentrations or with anthropogenic CO2 emissions. The other important couplings include for example the dependance of dust emissions (TACTIC) to land cover change (ISBA-CTRIP), influencing the aerosols and radiation processes in the atmosphere. Finally, atmospheric concentrations of key greenhouse gases such as ozone or methane are simulated by REPROBUS in CNRM-ESM2-1 are coupled with the model radiation parameterization. These couplings increase the realism (and degrees of freedom) of the model, which allows to further investigate the role of Earth system feedbacks in future climate projections.

Results from CNRM-ESM2-1 will serve several model intercomparison projects of CMIP6, in particular C4MIP, LUMIP, GeoMIP and ScenarioMIP. The forthcoming paper of Séférian et al. (in prep) details the modelling setup use for CMIP6 (including the use of recommended forcing and the spin-up strategy) and evaluates the performance of CNRM-ESM2-1 with respect to CNRM-CM6-1.

Main model components

The following figure illustrates the main model components:

 CNRM-ESM2 components

    ES-DOC model descriptions