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Article Dans Une Revue Quarterly Journal of the Royal Meteorological Society Année : 2004

Mars pathfinder: New data and new model simulations

Résumé

The diurnal cycle in the temperature and wind speed of the Mars Pathfinder lander (MPF) is compared with the results from a one-dimensional high-solution boundary-layer model. The radiation scheme of the model has been validated against line-by-line calculations in an average Martian case. The agreement with MPF observations is good. Strong daytime turbulent variability and steep vertical temperature gradients characterize the observations. A detailed look at the model physics reveals that the thin atmosphere responds strongly to thermal radiation. During the daytime, absorption of surface-emitted thermal radiation by CO2, water vapour and dust is the main heating agent below 200 m despite the fact that the surface layer is strongly convective and dust absorbs solar radiation. The night-time inversion is also transferred to the air mainly by long-wave processes, although turbulent cooling dominates very near the surface (below 40 m). The near-surface net heating/cooling displays a sensitive balance between several large and opposite physical processes, wherefore accurate algorithms and high resolution are needed for detailed model results. The modelled hydrologic cycle reveals a well-mixed layer of up to 5 km with thin icy fog and frost forming in the night-time. These sublimate back to the air soon after sunrise
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Dates et versions

hal-00559364 , version 1 (25-01-2011)

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Hannu Savijärvi, Anni Määttänen, Janne Kauhanen, Ari-Matti Harri. Mars pathfinder: New data and new model simulations. Quarterly Journal of the Royal Meteorological Society, 2004, 130 (597), pp.669-683. ⟨10.1256/qj.03.59⟩. ⟨hal-00559364⟩
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