  The recent detections of temperate terrestrial planets orbiting nearby stars
and the promise of characterizing their atmospheres motivates a need to
understand how the diversity of possible planetary parameters affects the
climate of terrestrial planets. In this work, we investigate the atmospheric
circulation and climate of terrestrial exoplanets orbiting both Sun-like and
M-dwarf stars over a wide swath of possible planetary parameters, including the
planetary rotation period, surface pressure, incident stellar flux, surface
gravity, planetary radius, and cloud particle size. We do so using a general
circulation model (GCM) that includes non-grey radiative transfer and the
effects of clouds. The results from this suite of simulations generally show
qualitatively similar dependencies of circulation and climate on planetary
parameters as idealized GCMs, with quantitative differences due to the
inclusion of additional model physics. Notably, we find that the effective
cloud particle size is a key unknown parameter that can greatly affect the
climate of terrestrial exoplanets. We confirm a transition between low and high
dayside cloud coverage of synchronously rotating terrestrial planets with
increasing rotation period. We determine that this cloud transition is due to
eddy-driven convergence near the substellar point and should not be
parameterization-dependent. Finally, we compute full-phase light curves from
our simulations of planets orbiting M-dwarf stars, finding that changing
incident stellar flux and rotation period affect observable properties of
terrestrial exoplanets. Our GCM results can guide expectations for planetary
climate over the broad range of possible terrestrial exoplanets that will be
observed with future space telescopes.
