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Ocean tide loading (OTL) displacements from global and local grids: comparisons to GPS estimates over the shelf of Brittany, France / Stavros A. Melachroinos in Journal of geodesy, vol 82 n° 6 (June 2008)
[article]
Titre : Ocean tide loading (OTL) displacements from global and local grids: comparisons to GPS estimates over the shelf of Brittany, France Type de document : Article/Communication Auteurs : Stavros A. Melachroinos, Auteur ; Richard Biancale, Auteur ; Muriel Llubes, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 357 - 371 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] baie
[Termes IGN] Bretagne
[Termes IGN] Cotentin
[Termes IGN] marée océanique
[Termes IGN] modèle physique
[Termes IGN] Mont-Saint-Michel
[Termes IGN] plateau continental
[Termes IGN] positionnement par GPS
[Termes IGN] série temporelle
[Termes IGN] surcharge océanique
[Termes IGN] trajet multipleRésumé : (Auteur) In this paper we examine OTL displacements detected by GPS stations of a dedicated campaign and validate ocean tide models. Our area of study is the continental shelf of Brittany and Cotentin in France. Brittany is one of the few places in the world where tides provoke loading displacements of ?10–12 cm vertically and a few cm horizontally. Ocean tide models suffer from important discrepancies in this region. Seven global and regional ocean tide models were tested: FES2004 corrected for K2, TPXO.7.0, TPXO.6.2, GOT00.2, CSR4.0, NAO.99b and the most recent regional grids of the North East Atlantic (NEA2004). These gridded amplitudes and phases of ocean tides were convolved in order to get the predicted OTL displacements using two different algorithms. Data over a period of 3.5 months of 8 GPS campaign stations located on the north coast of Brittany are used, in order to evaluate the geographical distribution of the OTL effect. We have modified and implemented new algorithms in our GPS software, GINS 7.1. GPS OTL constituents are estimated based on 1-day batch solutions. We compare the observed GPS OTL constituents of M2, S2, N2 and K1 waves with the selected ocean tide models on global and regional grids. Large phase-lag and amplitude discrepancies over 20° and 1.5 cm in the vertical direction in the semi-diurnal band of M2 between predictions and GPS/models are detected in the Bay of Mont St-Michel. From a least squares spectral analysis of the GPS time-series, significant harmonic peaks in the integer multiples of the orbital periods of the GPS satellites are observed, indicating the existence of multipath effects in the GPS OTL constituents. The GPS OTL observations agree best with FES2004, NEA2004, GOT00.2 and CSR4.0 tide models. Copyright Springer Numéro de notice : A2008-315 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-007-0185-6 En ligne : https://doi.org/10.1007/s00190-007-0185-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29308
in Journal of geodesy > vol 82 n° 6 (June 2008) . - pp 357 - 371[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-08051 SL Revue Centre de documentation Revues en salle Disponible 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)
[article]
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]Retrieving ocean surface current by 4D variational assimilation of Sea Surface Temperature images / G. Korotaev in Remote sensing of environment, vol 112 n° 4 (15/04/2008)
[article]
Titre : Retrieving ocean surface current by 4D variational assimilation of Sea Surface Temperature images Type de document : Article/Communication Auteurs : G. Korotaev, Auteur ; E. Huot, Auteur ; F.X. Le Dimet, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 1295 - 1305 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] champ de vitesse
[Termes IGN] courant marin
[Termes IGN] image NOAA-AVHRR
[Termes IGN] température de surface de la mer
[Termes IGN] variation
[Termes IGN] visualisation 4DRésumé : (Auteur) In this article, we propose a new method to estimate ocean mesoscale structures of the surface current velocity by processing sea surface satellite images. Assuming that the intensity level can be described by a transport–diffusion equation, the proposed approach is based on variational assimilation of image observations within a simple transport–diffusion model. This approach permits to retrieve the current velocity field from a sequence of satellite images. Results of processing synthetic data and real NOAA-AVHRR satellite images are presented and commented. Copyright Elsevier Numéro de notice : A2008-094 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2007.04.020 En ligne : https://doi.org/10.1016/j.rse.2007.04.020 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29089
in Remote sensing of environment > vol 112 n° 4 (15/04/2008) . - pp 1295 - 1305[article]GOCE : obtaining a portrait of Earth's most intimate features / M. Drinkwater in ESA bulletin, n° 133 (February 2008)
[article]
Titre : GOCE : obtaining a portrait of Earth's most intimate features Type de document : Article/Communication Auteurs : M. Drinkwater, Auteur ; Roger Haagmans, Auteur ; M. Kern, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 4 - 13 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Missions spatiales
[Termes IGN] circulation océanique
[Termes IGN] données GOCE
[Termes IGN] géoïde
[Termes IGN] GOCE
[Termes IGN] gradiomètre
[Termes IGN] levé gravimétrique
[Termes IGN] nivellement
[Termes IGN] satellite d'observation de la TerreRésumé : (Auteur) Known as ESA's "Gravity Mission", GOCE represent a blend of revolutionary new technology, designed to open a new chapter in what has historically been one of the most intriguing issues confronting science. Scheduled for launch in mid-2008, Goce will deliver data about the fundamental force of nature, which will benefit a broad range of applications in Earth sciences. Copyright European Space Agency Numéro de notice : A2008-124 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article DOI : sans En ligne : http://www.esa.int/esapub/bulletin/bulletin133/bul133b_drinkwater.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29119
in ESA bulletin > n° 133 (February 2008) . - pp 4 - 13[article]GOCE's measurements of the gravity field and beyond / R. Floberghaben in ESA bulletin, n° 133 (February 2008)
[article]
Titre : GOCE's measurements of the gravity field and beyond Type de document : Article/Communication Auteurs : R. Floberghaben, Auteur ; M. Drinkwater, Auteur ; Roger Haagmans, Auteur ; M. Kern, Auteur Année de publication : 2008 Article en page(s) : pp 24 - 31 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] circulation océanique
[Termes IGN] GOCE
[Termes IGN] gradient de gravitation
[Termes IGN] levé gravimétrique
[Termes IGN] niveau moyen des mersRésumé : (Auteur) Ocean circulation, sea level rise and the ocean's role as a regulator of climate are just some of the critical phenomena that can be further studied with the help of GOCE's gravity field products. But how do the spacecraft's measurements become part of this new information source? Copyright European Space Agency Numéro de notice : A2008-125 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans En ligne : http://www.esa.int/esapub/bulletin/bulletin133/bul133d_floberghagen.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29120
in ESA bulletin > n° 133 (February 2008) . - pp 24 - 31[article]Tsunami detection by GPS: how ionospheric observations might improve the global warning system / Giovanni Occhipinti in GPS world, vol 19 n° 2 (February 2008)PermalinkEstimation of storm surge in the bay of Bengal / John Fiske (2008)PermalinkLa modélisation numérique : un outil majeur pour les risques naturels / E. Foerster in Géosciences, n° 6 (01/10/2007)PermalinkCharacterizing patterns of plant distribution in a southern California salt marsh using remotely sensed topographic and hyperspectral data and local tidal fluctuations / S. Sadro in Remote sensing of environment, vol 110 n° 2 (28/09/2007)PermalinkInundation distances and run-up measurements from ASTER, QuickBird and SRTM data, Aceh coast, Indonesia / B.G. Mcadoo in International Journal of Remote Sensing IJRS, vol 28 n° 13-14 (July 2007)PermalinkMapping of the 26 December disaster by using Formosat-2 images / M.D. Yang in International Journal of Remote Sensing IJRS, vol 28 n° 13-14 (July 2007)PermalinkThe 26 December 2004 tsunami measured by satellite altimetry / J. Gower in International Journal of Remote Sensing IJRS, vol 28 n° 13-14 (July 2007)PermalinkTidal analysis experiments with sun-synchronous satellite altimeter data / R.D. Ray in Journal of geodesy, vol 81 n° 4 (April 2007)PermalinkDetermination of the free core nutation period from tidal gravity observations of the GGP superconducting gravimeter network / B. Ducarme in Journal of geodesy, vol 81 n° 3 (March 2007)PermalinkRTE [Réseau Terre et Espace] : les satellites font leurs preuves / Françoise de Blomac in SIG la lettre, n° 85 (mars 2007)Permalink