Exploitation des observations satellitaires IASI couplées à un modèle régional pour l'amélioration de la prévision des épisodes de pollution en ozone

Anne Boynard 1
1 TROPO - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : Satellite observations now contribute to the monitoring of the tropospheric composition and the air quality forecasting by providing quantitative information on ozone and its precursors. The objective of this thesis was to exploit the coupling between IASI satellite observations, which was launched on board the MetOp platform in October 2006, and the model CHIMERE in order to document the improvement of the air quality forecasting. This thesis is based primarily on the retrieval of ozone concentrations from infrared spectra measured by the IASI instrument in order to retrieve total ozone columns and ozone partial columns especially in the troposphere. These measurements have been validated by independent observations: the total columns are compared to ultra-violet measurements provided by the satellite instrument GOME 2 (also on board the MetOp satellite) and the ground-based instruments of the Brewer-Dobson network but also infrared measurements (AIRS and TES). The partial columns are compared to ozonesonde measurements. Another component of my thesis was to prepare IASI data assimilation into the model CHIMERE, using a Kalman Filter Ensemble. This method allows the establishment of modelling error covariances from a set of different configurations of the model. In this context, work on the construction of an ensemble that best reflects the reality has been undertaken. The quality of the ensemble was evaluated in the vertical dimension and at the surface from different tools, which are all based on comparisons with observations.
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Submitted on : Monday, June 7, 2010 - 12:27:19 AM
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Anne Boynard. Exploitation des observations satellitaires IASI couplées à un modèle régional pour l'amélioration de la prévision des épisodes de pollution en ozone. Océan, Atmosphère. Université Pierre et Marie Curie - Paris VI, 2009. Français. ⟨tel-00489656⟩

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