Validation of the chemistry-transport model MOCAGE using satellite observations
Maud Martet(1) and Vincent-Henri Peuch(1)
(1) CNRM Météo France, 42, avenue Gaspard Coriolis, 31057 Toulouse, France
Due to their scattering and absorbing properties, aerosols affect solar and terrestrial radiations, modifying Earth’s radiative balance. Therefore, they may have an important role in climate change. In order to quantify the impact of aerosols on this change, it is important to consider aerosols in climatic simulations. The Chemistry-Transport Model of Météo-France MOCAGE reproduces the composition of atmosphere (three-dimensional gazes and aerosols concentrations). A validation of MOCAGE results is necessary if we want to couple it with a climatic model.
Thanks to satellites, global data are at our disposal: satellites measure backscattered radiation and calculate the aerosol optical thickness. Considering that the particles are spherical and determining the complex refractive index according to aerosol type (black carbon, desert dust…) and wavelength [Torres, 2002], this parameter is linked to aerosol concentrations. Using a Mie code, aerosol optical thickness is calculated by this model. Comparing measured and computed data, we can globally validate MOCAGE results. This study shows that three-dimensional aerosols fields calculated by MOCAGE are reliable and can be used by a climatic model.
Keywords: ESA European
Space Agency - Agence spatiale europeenne,
observation de la terre, earth observation,
satellite remote sensing,
teledetection, geophysique, altimetrie, radar,
chimique atmospherique, geophysics, altimetry, radar,