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<publisher>HAL CCSD</publisher>
<title lang=en>GPS estimates of ocean tide loading in NW-France: determination of ocean tide loading constituents and comparison with a recent ocean tide model</title>
<creator>Vergnolle, Mathilde</creator>
<creator>Bouin, M.</creator>
<creator>Morel, L.</creator>
<creator>Masson, F.</creator>
<creator>Durand, S.</creator>
<creator>Nicolas, Jean-Marie</creator>
<creator>Melachroinos, S.</creator>
<contributor>Laboratoire de Géophysique Interne et Tectonophysique (LGIT) ; Observatoire des Sciences de l'Univers de Grenoble (OSUG) ; Université Joseph Fourier - Grenoble 1 (UJF) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS) - Université Joseph Fourier - Grenoble 1 (UJF) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS) - Laboratoire Central des Ponts et Chaussées (LCPC) - Institut des Sciences de la Terre (ISTerre) ; Université Joseph Fourier - Grenoble 1 (UJF) - Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR) - Institut national des sciences de l'Univers (INSU - CNRS) - Institut de recherche pour le développement [IRD] : UR219 - PRES Université de Grenoble - Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]) - Centre National de la Recherche Scientifique (CNRS) - Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR) - Institut de recherche pour le développement [IRD] : UR219 - PRES Université de Grenoble - Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>LAboratoire de Recherche en Géodésie [Champs-sur-Marne] (LAREG) ; Institut géographique national [IGN ]</contributor>
<contributor>Laboratoire de Géodésie et de Géomatique (L2G ESGT CNAM) ; École Supérieure des Géomètres et Topographes (ESGT CNAM) ; Conservatoire National des Arts et Métiers [CNAM] (CNAM) - Conservatoire National des Arts et Métiers [CNAM] (CNAM) - Conservatoire National des Arts et Métiers [CNAM] (CNAM)</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Groupement de Recherche en Géodésie Spatiale (GRGS) ; Centre National d'Etudes Spatiales (CNES)</contributor>
<description>International audience</description>
<source>ISSN: 0956-540X</source>
<source>EISSN: 1365-246X</source>
<source>Geophysical Journal International</source>
<publisher>Oxford University Press (OUP)</publisher>
<identifier>insu-00335909</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-00335909</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-00335909/document</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-00335909/file/Vergnolle_GJI_08_revised.pdf</identifier>
<source>https://hal-insu.archives-ouvertes.fr/insu-00335909</source>
<source>Geophysical Journal International, Oxford University Press (OUP), 2008, 173 (2), pp.444 à 458. 〈10.1111/j.1365-246X.2008.03734.x〉</source>
<identifier>DOI : 10.1111/j.1365-246X.2008.03734.x</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-246X.2008.03734.x</relation>
<language>en</language>
<subject lang=en>Time series analysis</subject>
<subject lang=en>Space geodetic surveys</subject>
<subject lang=en>Tides and planetary waves</subject>
<subject lang=en>Europe</subject>
<subject>[SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]</subject>
<subject>[PHYS.PHYS.PHYS-GEO-PH] Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Ocean loading effects cause 3-D displacements large enough to affect space geodesy measurements either at the subdiurnal periods or at longer time scales by the means of spurious signals. GPS measurements, in turn, could provide local improvements of the models in coastal areas if their ability to precisely monitor such rapid displacements is assessed. In this paper, we use 105 days of continuous GPS measurements collected in 2004 in the French Brittany and Cotentin region to investigate: (1) the precision achieved by the GPS analysis on measuring 3-D subdiurnal displacements and amplitude and phase of the tidal constituents, (2) the quality of the most recent ocean tide model FES2004 in such a complex coastal context. Indeed, in this area, tide amplitudes are among the largest in the world (up to 16 cm of loading displacements on the vertical component) and are believed to show strong shallow-water tides. From a state of the art GPS analysis using the scientific GAMIT software over 2-h sessions, we test two independent strategies for the realization of the reference frame. The position time series are then compared with the displacements predicted by the FES2004 model applied on an elastic Earth model. The two sets of results are consistent with each other at the same level of agreement than with the predicted displacements, namely 3–5 mm on the horizontal components, 10 mm on the vertical. This assesses the capability of this technique for measuring 3-D ocean tide loading deformation. We validate the FES2004 model in the Brittany area, even though it slightly (2–7 mm) underestimates the three components amplitudes. With a harmonic analysis of the observed position time series, we obtain nevertheless an agreement at a submillimetre level for the M2, N2, O1, Q1 tidal constituents and at a millimetre level for the K1 and S2 tidal constituents. Moreover, we can extract a significant M4 load signal at the 95 per cent confidence level from the GPS time series at the stations located in the Mont St Michel area. The detection of other shallow-water constituents would be helpful to understand the amplitude deficit between the FES2004 predicted and GPS observed displacements.</description>
<date>2008</date>
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