  Interpretation of the ongoing efforts to simulate the atmospheres of
potentially-habitable terrestrial exoplanets requires that we understand the
underlying dynamics and chemistry of such objects to a much greater degree than
1D or even simple 3D models enable. Here, for the tidally-locked habitable-zone
planet TRAPPIST-1e, we explore one effect which can shape the dynamics and
chemistry of terrestrial planets: the inclusion of an Earth-like land-ocean
distribution with orography. To do this we use the Earth-system model
WACCM6/CESM2 to run a pair of TRAPPIST-1e models with N$_2$-O$_2$ atmospheres
and with the sub-stellar point fixed over either land or ocean. The presence of
orography shapes atmospheric transport, and in the case of Earth-like
orography, breaks the symmetry between the northern and southern hemispheres
which was previously found in slab ocean models. For example, peak zonal jet
speeds in the southern hemisphere are $50\rightarrow100\%$ faster than similar
jets in the northern hemisphere. This also affects the meridional circulation,
transporting equatorial material towards the south-pole. As a result we also
find significant changes in the atmospheric chemistry, including the
accumulation of potentially lethal quantities of ozone at both the south pole
and the surface. Future studies which investigate the effects of land-mass
distribution on the dynamics of exoplanetary atmospheres should pay close
attention to both the day-side land-fraction as well as the orography of the
land. Simply modelling a flat land-mass will not give a complete picture of its
dynamical impact.
