CAMEMBERT: A Mini-Neptunes General Circulation Model Intercomparison, Protocol Version 1.0.A CUISINES Model Intercomparison Project

Christie, Duncan A.; Lee, Elspeth K. H.; Innes, Hamish; Noti, Pascal Andreas; Charnay, Benjamin; Fauchez, Thomas J.; Mayne, Nathan J.; Deitrick, Russell; Ding, Feng; Greco, Jennifer J.; Hammond, Mark; Malsky, Isaac; Mandell, Avi; Rauscher, Emily; Roman, Michael T.; Sergeev, Denis E.; Sohl, Linda; Steinrueck, Maria E.; Turbet, Martin; Wolf, Eric T.; ... (2022). CAMEMBERT: A Mini-Neptunes General Circulation Model Intercomparison, Protocol Version 1.0.A CUISINES Model Intercomparison Project. The planetary science journal, 3(11), p. 261. IOP Publishing 10.3847/PSJ/ac9dfe

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With an increased focus on the observing and modeling of mini-Neptunes, there comes a need to better understand the tools we use to model their atmospheres. In this Paper, we present the protocol for the Comparing Atmospheric Models of Extrasolar Mini-Neptunes Building and Envisioning Retrievals and Transits, CAMEMBERT, project, an intercomparison of general circulation models (GCMs) used by the exoplanetary science community to simulate the atmospheres of mini-Neptunes. We focus on two targets well studied both observationally and theoretically with planned JWST cycle 1 observations: the warm GJ 1214b and the cooler K2-18b. For each target, we consider a temperature-forced case, a clear sky dual-gray radiative transfer case, and a clear sky multiband radiative transfer case, covering a range of complexities and configurations where we know differences exist between GCMs in the literature. This Paper presents all the details necessary to participate in the intercomparison, with the intention of presenting the results in future papers. Currently, there are eight GCMs participating (ExoCAM, Exo-FMS, FMS PCM, Generic PCM, MITgcm, RM-GCM, THOR, and the Unified Model), and membership in the project remains open. Those interested in participating are invited to contact the authors.

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