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A study of airborne dust behaviour on Mars and its effect on albedo from the MGS-TES data

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A study of airborne dust behaviour on Mars and its effect on albedo from the MGS-TES data
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  A study of airborne dust behavior on Mars and its effect on albedo from the MGS-TES data Zinzi A. 1,2 , Palomba E.  2 , Rinaldi G.  2 , D’Aoe  M.  2 1. CETEMP“, Uiesità degli studi di L’Auila, Italy  2.Istituto di Fisica dello Spazio Interplanetario (IFSI-INAF), Rome, Italy European Planetary Science Congress 2009 13  –  18 September 2009, Potsdam, Germany  Introduction Albedo observations by orbiting instruments are crucial for the study of the Martian surface They can be used to infer the soil type and are the basis to compute other surface properties (e.g. themal inertia) However the atmospheric dust opacity ( t dust ) in the Martian atmosphere may influence the observations Zinzi et al. A study of airborne dust behavior on Mars and its effect on albedo from the MGS-TES data EPSC 2009  Single scattering approximation For low opacities: A ( t ) = A s  + a  · t (single scattering approx.  –  Erard et al., 1994) Dark regions brighten, while high albedo regions tend to become darker. Zinzi et al. A study of airborne dust behavior on Mars and its effect on albedo from the MGS-TES data EPSC 2009  Open issues • The defiitio of lo opacities is ot ell defined • No accurate study has been performed for high opacities Hence to accurately use observations of surface properties acquired by orbiting instruments an in depth study of these properties is needed Zinzi et al. A study of airborne dust behavior on Mars and its effect on albedo from the MGS-TES data EPSC 2009  Work objectives 1)Determine the limit of validity of the single scattering approximation 2)Find the behaviour of the observed albedo with t  for high opacities 3)Determine the main dust grain size that causes this behaviour Zinzi et al. A study of airborne dust behavior on Mars and its effect on albedo from the MGS-TES data EPSC 2009
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