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| HAL : hal-00456001, version 1 |
| DOI : 10.1016/j.jog.2009.09.022 |
| Fiche détaillée |  Récupérer au format |
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| Journal of Geodynamics 48 (2009) 182-188 |
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| Modelling atmospheric and induced non-tidal oceanic loading contributions to surface gravity and tilt measurements |
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Jean-Paul Boy 1Laurent Longuevergne 2 |
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| (2009) |
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| We investigate the contribution of atmospheric and its induced non-tidal oceanic loading effects on surface time-varying gravity and tilt measurements for several stations in Western Europe. The ocean response to pressure forcing can be modelled accordingly to the inverted barometer, i.e. assuming that air pressure variations are fully compensated by static sea height changes, or using ocean general circulation models. We validate two runs of the HUGO-m barotropic ocean model by comparing predicted sea surface height variations with hundred tide-gauge measurements along the European coasts. We then show that global surface pressure field, as well as a barotropic high-resolution ocean model forced by air pressure and winds allow in most cases a significant reduction of the variance of gravity residuals and, to a smaller extends tilt residuals.;We finally show that precise gravity measurements with superconducting gravimeters allow the observation of large storm surges, occurring in the North Sea, even for inland stations. However, we also confirm that the continental hydrology contribution cannot be neglected. Thanks to their specific sensitivity feature, only tiltmeters closest to the coast can clearly detect the loading due to these storm surges. |
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| 1 : | Institut de physique du globe de Strasbourg (IPGS) |
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CNRS : UMR7516 – INSU – Université de Strasbourg |
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| 2 : | Bureau of Economic Geology, Jackson School of Geosciences, The University of Texas, Austin |
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inconnue |
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| 3 : | Géosciences Montpellier (GM) |
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CNRS : UMR5243 – Université Montpellier II - Sciences et techniques |
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| 4 : | Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) |
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CNRS : UMR5566 – Institut de recherche pour le développement [IRD] – CNES – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III |
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| 5 : | Institut de Physique du Globe de Paris (IPGP) |
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CNRS : UMR7154 – INSU – IPG PARIS – Université Pierre et Marie Curie (UPMC) - Paris VI – Université Paris VII - Paris Diderot – Université de la Réunion |
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| Domaine | : | Planète et Univers/Sciences de la Terre/Géophysique Physique/Physique/Géophysique Sciences de l'environnement/Milieux et Changements globaux |
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| Atmospheric loading – Non-tidal oceanic loading – Superconducting gravimeters – Hydrostatic tiltmeters – Storm surges |
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| hal-00456001, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00456001 | |
| oai:hal.archives-ouvertes.fr:hal-00456001 | |
| Contributeur : Gm Aigle | |
| Déposé pour le compte de : | |
| Soumis le : Jeudi 11 Février 2010, 15:13:02 | |
| Dernière modification le : Jeudi 11 Février 2010, 15:13:03 | |
