  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. Nevertheless, the inter-model
spread in the global mean surface temperature is non-negligible: 14 K and 24 K
in the nitrogen and carbon dioxide dominated case, respectively. We find
substantial inter-model differences in moist variables, with the smallest
amount of clouds in LMD-Generic and the largest in ROCKE-3D. ExoCAM predicts
the warmest climate for both cases and thus has the highest water vapor content
and the largest amount and variability of cloud condensate. The UM tends to
produce colder conditions, especially in the nitrogen-dominated case due to a
strong negative cloud radiative effect on the day side of TRAPPIST-1e. Our
study highlights various biases of GCMs and emphasizes the importance of not
relying solely on one model to understand exoplanet climates.
