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Auteur J. Nicolas |
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GPS estimates of ocean tide loading in NW-France: Determination of ocean tide loading constituents and comparison with a recent ocean tide model / Mathilde Vergnolle in Geophysical journal international, vol 173 n° 2 (May 2008)
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Titre : GPS estimates of ocean tide loading in NW-France: Determination of ocean tide loading constituents and comparison with a recent ocean tide model Type de document : Article/Communication Auteurs : Mathilde Vergnolle, Auteur ; Marie-Noëlle Bouin , Auteur ; Laurent Morel, Auteur ; F. Masson, Auteur ; S. Durand, Auteur ; J. Nicolas, Auteur ; Stavros A. Melachroinos, Auteur Année de publication : 2008 Article en page(s) : pp 444 - 458 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] amplitude
[Termes IGN] analyse harmonique
[Termes IGN] effet de charge
[Termes IGN] France (administrative)
[Termes IGN] marée océanique
[Termes IGN] série temporelleRésumé : (auteur) 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. Numéro de notice : A2008-616 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1365-246X.2008.03734.x Date de publication en ligne : 01/05/2008 En ligne : https://doi.org/10.1111/j.1365-246X.2008.03734.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102899
in Geophysical journal international > vol 173 n° 2 (May 2008) . - pp 444 - 458[article]The role of Laser ranging for calibrating Jason-1: The Corsica tracking campaign / Pierre Exertier in Marine geodesy, vol 27 n°1-2 (January - June 2004)
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Titre : The role of Laser ranging for calibrating Jason-1: The Corsica tracking campaign Type de document : Article/Communication Auteurs : Pierre Exertier, Auteur ; J. Nicolas, Auteur ; Philippe Berio, Auteur ; David Coulot , Auteur ; Pascal Bonnefond, Auteur ; Olivier Laurain, Auteur Année de publication : 2004 Article en page(s) : pp 333 - 340 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] campagne d'observations
[Termes IGN] Jason
[Termes IGN] Station laser ultra-mobileRésumé : (auteur) The French Transportable Laser Ranging System (FTLRS), a highly transportable Satellite Laser Ranging (SLR) instrument, was set up in Corsica (from January to September 2002) for participating to the JASON-1 altimeter verification phase. In addition to the tracking of oceanographic satellite missions and in order to perform an accurate positioning, the FTLRS also acquired laser ranging data on geodetic satellites, STARLETTE and STELLA essentially. The paper describes the analysis strategy mainly based on the use of a short-arc orbit technique to compute accurate 1 cm local orbits, and then the geocentric positioning (2–3 mm relative to GPS). Finally, we established the JASON-1 absolute calibration value, based on 9 SLR short-arcs (between cycles 1 and 26), at 108.2 ± 8.7 mm; the 10-day repeatability is of 26.1 mm showing that a great accuracy has been reached. Numéro de notice : A2004-581 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01490410490476272 Date de publication en ligne : 10/08/2010 En ligne : https://doi.org/10.1080/01490410490476272 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103045
in Marine geodesy > vol 27 n°1-2 (January - June 2004) . - pp 333 - 340[article]Réservation
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