Radiatively-Active Aerosols Within Mars' Atmosphere: Influences on the Weather and Climate as Simulated by the NASA ARC Mars GCM - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2010

Radiatively-Active Aerosols Within Mars' Atmosphere: Influences on the Weather and Climate as Simulated by the NASA ARC Mars GCM

Résumé

Upgrades to the NASA Ames Research Center (ARC) Mars general circulation model (GCM) include a modernized radiative-transfer package which permits radiative effects and interactions of suspended atmospheric aerosols (e.g., water ice clouds, water vapor, dust, and their mutual interactions) to influence the net diabatic heating within the atmosphere. Atmospheric aerosols are critically important in determining the nature of the mean thermal structure and circulation, and hence the overall climate of the planet. Recent GCM simulations indicate that radiatively-active water ice clouds profoundly affect the seasonal and annual mean climate in a variety of ways. Preliminary results suggest that the bulk thermal structure and resultant (i.e., balanced) circulation patterns are strongly modified near the surface and aloft. Generally speaking, we find a bulk warming of the atmosphere in upper layers, a cooling of the atmosphere in the lower and near-surface regions, and, increases in the mean pole-to-equator temperature contrasts (i.e., stronger mean "baroclinicity" and augmented zonal jets). This increased baroclinicity affects significantly the intensity and seasonality of synoptic weather systems. A variety of results from our baseline and control simulations (i.e., where the radiative/physical effects are examined in isolation and when combined) will be presented. Comparisons with MGS/TES and MRO/MCS measurements indicate better agreement between the model's simulated climate compared to that observed. Using a state-of-the-art Mars GCM, these results highlight important effects radiatively-active aerosols have on physical and dynamical processes active in the current climate of Mars.
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hal-04115183 , version 1 (02-06-2023)

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J. Hollingsworth, M. A. Kahre, R. M. Haberle, Franck Montmessin, R. Wilson, et al.. Radiatively-Active Aerosols Within Mars' Atmosphere: Influences on the Weather and Climate as Simulated by the NASA ARC Mars GCM. American Geophysical Union Fall 2010, Dec 2010, San Francisco California, United States. pp.abstract id.P53E-1575. ⟨hal-04115183⟩
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