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<dc:title xml:lang="fr">Modélisation et suivi de l'éclairement et de l'albédo de surface à partir de données satellitaires : le cas du Tibet</dc:title>
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<dc:subject xml:lang="fr">Bilan radiatif</dc:subject>
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<dc:subject xml:lang="fr">Topographie</dc:subject>
<dc:subject xml:lang="fr">Nébulosité</dc:subject>
<dc:subject xml:lang="fr">Eclairement</dc:subject>
<dc:subject xml:lang="en">Radiation budget</dc:subject>
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<dcterms:abstract xml:lang="fr">Le suivi journalier du bilan radiatif solaire est indispensable à l’étude des processus à l'interface sol-atmosphère, en particulier en climatologie et en hydrologie. Dans le cadre du projet CEOP-Aegis visant à étudier l'hydrologie du plateau du Tibet, cette thèse se concentre sur le développement d'une méthode permettant d’en estimer le bilan radiatif solaire de surface de façon quotidienne. Une série temporelle de flux radiatifs produite à partir de produits satellitaires existants met en évidence la nécessité d’intégrer la variabilité sous-pixel du terrain et des nuages pour les zones aussi hétérogènes que le Tibet. L’analyse de l’impact de la variabilité spatiale et temporelle des nuages sur le rayonnement solaire illustre le bénéfice lié à l’utilisation de la répartition des nuages plutôt que la fraction de nébulosité et l’importance d’une résolution temporelle élevée. Une méthode novatrice proposée pour la correction topographique sous-pixel montre que l’utilisation d’un modèle numérique de terrain à haute résolution spatiale améliore significativement l'estimation de l’éclairement ainsi que de l'albédo. Deux approches sont proposées pour améliorer l’estimation du bilan radiatif intégrant de manière adéquate l’hétérogénéité sous-pixel.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Monitoring the solar radiation budget on a daily basis is a prerequisite to study land surface processes, especially in climatology and hydrology. As part of the CEOP-Aegis project studying the hydrology of the Tibetan Plateau, this thesis focuses on developing a method to adequately estimate at-surface daily solar radiation budget over this particular area. A radiation budget time series produced based on existing satellite data products highlights the necessity to consider terrain and clouds sub-pixel variability when working over heterogeneous areas such as the Tibetan Plateau. The analysis of the impact of spatial and temporal variability of clouds on solar radiation demonstrates that the surface irradiance estimation would benefit from using cloud distribution instead of cloud fraction and the significance of high temporal resolution. A new sub-pixel topographic correction method is proposed and shows that using high resolution digital elevation model improves the irradiance as well as the albedo retrieval. Two approaches are proposed to improve solar radiation budget estimates taking into account adequately the sub-pixel heterogeneity.</dcterms:abstract>
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