The TRAPPIST-1 Habitable Atmosphere Intercomparison (THAI). Part II: Moist Cases -- The Two Waterworlds
Denis E. Sergeev, Thomas J. Fauchez, Martin Turbet, Ian A. Boutle,, Kostas Tsigaridis, Michael J. Way, Eric T. Wolf, Shawn D. Domagal-Goldman,, Francois Forget, Jacob Haqq-Misra, Ravi K. Kopparapu, F. Hugo Lambert, James, Manners, Nathan J. Mayne

TL;DR
This study compares four different 3D climate models to understand the atmospheres of temperate exoplanets, revealing significant differences in their predictions but overall agreement on habitability potential.
Contribution
It provides a comprehensive intercomparison of GCMs for moist exoplanet atmospheres, highlighting model biases and the importance of multi-model approaches.
Findings
All models predict habitable, temperate climates.
Significant differences in surface temperature and cloud cover among models.
ExoCAM predicts the warmest and most humid conditions.
Abstract
To identify promising exoplanets for atmospheric characterization and to make the best use of observational data, a thorough understanding of their atmospheres is needed. 3D general circulation models (GCMs) are one of the most comprehensive tools available for this task and will be used to interpret observations of temperate rocky exoplanets. Due to parameterization choices made in GCMs, they can produce different results, even for the same planet. Employing four widely-used exoplanetary GCMs -- ExoCAM, LMD-G, ROCKE-3D and the UM -- we continue the TRAPPIST-1 Habitable Atmosphere Intercomparison by modeling aquaplanet climates of TRAPPIST-1e with a moist atmosphere dominated by either nitrogen or carbon dioxide. Although the GCMs disagree on the details of the simulated regimes, they all predict a temperate climate with neither of the two cases pushed out of the habitable state.…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Atmospheric Ozone and Climate · Astro and Planetary Science
