Atmospheric Chemistry on Mars Using the Global Mars Multiscale Model (G3M)

The chemical stability of the atmosphere of Mars appears to be determined by HOx chemistry which in turn is related to the distributions of water and ozone. Using the G3M (Global Mars Multiscale Model) as a host we have added chemistry and dust modules. The dynamical model is based on a SL/SI dynamical framework employed in the Canadian Meteorological Service of Canada's weather forecast model, GEM (Global Environmental Multiscale) model. The model includes comprehensive physics and has been extended to over 150 km and been run in global uniform (at 1.3^o~horizontal resolution) and zoom mode with an interior resolution of 10 km). The version that we will present has a top at 150 km with uniform horizontal resolution. The chemistry added includes photolysis of CO₂ and water vapour and related products and also includes ozone chemistry. Long-lived chemical species are subject to transport by the resolved circulation and by diffusion within the PBL. At present we have not included heterogeneous chemistry. We will present seasonal distributions of CO and ozone and compare with available observations.