  We present results from the Met Office Unified Model (UM), a world-leading
climate and weather model, adapted to simulate a dry Martian climate. We detail
the adaptation of the basic parameterisations and analyse results from two
simulations, one with radiatively active mineral dust and one with radiatively
inactive dust. These simulations demonstrate how the radiative effects of dust
act to accelerate the winds and create a mid-altitude isothermal layer during
the dusty season. We validate our model through comparison with an established
Mars model, the Laboratoire de M\'et\'eorologie Dynamique planetary climate
model (PCM), finding good agreement in the seasonal wind and temperature
profiles but with discrepancies in the predicted dust mass mixing ratio and
conditions at the poles. This study validates the use of the UM for a Martian
atmosphere, highlighting how the adaptation of an Earth general circulation
model (GCM) can be beneficial for existing Mars GCMs and provides insight into
the next steps in our development of a new Mars climate model.
