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<dc:title xml:lang="fr">Détermination des variations saisonnières de la charge en Europe par inversion des déplacements GNSS calculés avec le logiciel GINS</dc:title>
<dcterms:alternative xml:lang="en">Determination of seasonal loading in Europe by inverting GNSS displacements computed with GINS software</dcterms:alternative>
<dc:subject xml:lang="fr">Géodésie spatiale</dc:subject>
<dc:subject xml:lang="fr">Charges hydrologiques</dc:subject>
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<dc:subject xml:lang="fr">Visco-élasticité</dc:subject>
<dc:subject xml:lang="fr">Régularisation de Tikhonov</dc:subject>
<dc:subject xml:lang="en">Spatial geodesy</dc:subject>
<dc:subject xml:lang="en">Hydrological loading</dc:subject>
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<dcterms:abstract xml:lang="fr">Cette étude porte sur la détermination des charges hydrologiques saisonnières en Europe. L'objectifest d'autant plus difficile que les zones tempérées possèdent un signal hydrologique saisonnierparticulièrement faible, compte tenu du bruit des mesures géodésiques. L'utilisation du GNSSpermet d'améliorer sensiblement la résolution spatiale avec laquelle nous calculons ces chargeslocalement grâce à la forte densité de station, par rapport aux solutions issues de la gravimétriespatiale (missions GRACE). Nous avons mis en place une méthodologie permettant d'inverser lesdéplacements saisonniers GNSS pour retrouver la charge équivalente, et ce en utilisant lesdéplacements de plus de 1000 stations GNSS dont les solutions ont été calculées avec le logicielGINS. Dans un même temps, nous avons développé une méthode permettant le calcul desdéformations visco-élastiques de la Terre solide, dans un nouveau formalisme utilisant latransformée de Fourier.</dcterms:abstract>
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