  Planetary climates are strongly affected by planetary orbital parameters such
as obliquity, eccentricity, and precession. In exoplanetary systems,
exo-terrestrial planets should have various obliquities. High-obliquity planets
would have extreme seasonal cycles due to the seasonal change of the
distribution of the insolation. Here, we introduce the Non-hydrostatic
ICosahedral Atmospheric Model(NICAM), a global cloud-resolving model, to
investigate the climate of high-obliquity planets. This model can explicitly
simulate a three-dimensional cloud distribution and vertical transports of
water vapor. We simulated exo-terrestrial climates with high resolution using
the supercomputer FUGAKU. We assumed aqua-planet configurations with 1 bar of
air as a background atmosphere, with four different obliquities ($0^{\circ}$,
$23.5^{\circ}$, $45^{\circ}$, and $60^{\circ}$). We ran two sets of
simulations: 1) low-resolution (~ 220 km-mesh as the standard resolution of a
general circulation model for exoplanetary science) with parametrization for
cloud formation, and 2) high-resolution (~ 14 km-mesh) with an explicit cloud
microphysics scheme. Results suggest that high-resolution simulations with an
explicit treatment of cloud microphysics reveal warmer climates due to less low
cloud fraction and a large amount of water vapor in the atmosphere. It implies
that treatments of cloud-related processes lead to a difference between
different resolutions in climatic regimes in cases with high obliquities.
