Modelling The Radiation In The Martian Atmosphere At The Phoenix Lander Site.

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The temperature of the Martian atmosphere is dependent on the presence of gases, dust, water vapour, and ice particles. We are interested in the impacts on the radiation and chemistry to the first order that occur by changing the properties of these particles. More specifically, we are investigating the full nature of the effect of these particles on the heating and cooling rates, using a model developed in preparation for the 2007 Phoenix Mars Scout Mission. Our Mars Microphysical Model (MMM) is a one-dimensional version of our three-dimensional coupled Earth-based model, CARMA-SMVGEARII, that has been adapted to conditions associated with Mars. The model is run from the surface to an altitude of 100km, simulating radiative, chemical and microphysical processes in the northern polar region. Using input temperature profiles from the Thermal Emission Spectrometer, we are able to produce diurnal atmospheric temperature variations and net heating rates on the same order of magnitude as other studies. The dependence of the heating in the solar and infrared spectra on the presence of aerosols, dust and water ice will be presented at the meeting.

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