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Ajouter le résultat dans votre panier Affiner la recherche Interroger des sources externesIWV retrieval from ground and shipborne GPS receivers during NAWDEX [diaporama] / Pierre Bosser (2020)
Titre : IWV retrieval from ground and shipborne GPS receivers during NAWDEX [diaporama] Type de document : Article/Communication Auteurs : Pierre Bosser Editeur : Munich [Allemagne] : European Geosciences Union EGU Année de publication : 2020 Projets : 1-Pas de projet / Conférence : EGU 2020, General Assembly, Sharing Geoscience 04/05/2020 08/05/2020 en ligne Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes descripteurs IGN] coordonnées GPS
[Termes descripteurs IGN] données GPS
[Termes descripteurs IGN] données météorologiques
[Termes descripteurs IGN] teneur intégrée en vapeur d'eauRésumé : (auteur) For the documentation of time and space variations of water vapor in atmosphere during the Nawdex campaign (North Atlantic, Autumn 2016), a ground network of more than 1200 coastal continuously operation reference GNSS stations has been analyzed. This network spreads from Caribbeans to Morocco through Greenland. Retrieved IWV have been used to evaluate ERAI and ERA5 reanalysis and highlight improvements made by ERA5 (-0.2 +/- 1.6 kg/m2 vs -0.3 +/- 2.1 kg/m2 overall). They are also used to describe high impact weather events that took place during the experiment. The analysis of this ground GNSS network has been completed with the IWV retrieved from GPS data acquired by the French RV Atalante which cruises in the area during the experiment. IWV from shipborne receiver are consistent with both ERAI and ERA5 reanalysis (1.0 +/- 3.2 kg/m2 and 1.3 +/- 2.0 kg/m2 respectively) ; shipborne IWV also agree with IWV from nearby ground GNSS stations (-0.4 +/- 0.9 kg/m2). These results confirm the quality of shipborne IWV retrievals and opens up prospects for use in climatology and meteorology. Numéro de notice : C2020-021 Affiliation des auteurs : UMR IPGP-Géod+Ext (2020- ) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.5194/egusphere-egu2020-6956 date de publication en ligne : 16/10/2020 En ligne : https://doi.org/10.5194/egusphere-egu2020-6956 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=96578
Titre : IWV retrieval from shipborne GPS receiver on hydrographic ship Borda [diaporama] Type de document : Article/Communication Auteurs : Olivier Bock Editeur : Munich [Allemagne] : European Geosciences Union EGU Année de publication : 2020 Projets : 1-Pas de projet / Conférence : EGU 2020, General Assembly, Sharing Geoscience 04/05/2020 08/05/2020 en ligne Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes descripteurs IGN] données GPS
[Termes descripteurs IGN] données météorologiques
[Termes descripteurs IGN] image Aqua-MODIS
[Termes descripteurs IGN] modèle de simulation
[Termes descripteurs IGN] navire
[Termes descripteurs IGN] teneur intégrée en vapeur d'eauRésumé : (auteur) This work aims to provide a quick review of different experiments conducted in the past for the estimation of integrated water vapor content from shipborne GNSS receiver. This state of the art will be confronted with results obtained using GPS data acquired by the French Hydrographic Ship Borda on a cruise over Atlantic Ocean and Mediterranean Sea, from Brest to Toulon in August 2015; the estimated IWV are compared with satellite observations (MODIS) and outputs from numerical weather prediction models (ERAI, ERA5, Arpege, Arome); while differences between GPS and MODIS retrievals reach almost 4 kg/m2 in terms of RMS, agreement is generally much better with numerical models (2 up to 3 kg/m2 in terms of RMS). Use of real-time orbit and clocks product is also investigated in order to assess the performance of near real-time GPS-IWV estimation for NWP purposes. We will draw out the prospects in terms of possibilities and opportunities for the use of shipborne GNSS IWV for meteorology and climatology. Numéro de notice : C2020-022 Affiliation des auteurs : UMR IPGP-Géod+Ext (2020- ) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.5194/egusphere-egu2020-7518 date de publication en ligne : 16/10/2020 En ligne : https://doi.org/10.5194/egusphere-egu2020-7518 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=96580
Titre : GRACE gravitational signature of the 2011 Mw 9.0 Tohoku-oki earthquake Type de document : Article/Communication Auteurs : Isabelle Panet Editeur : Munich [Allemagne] : European Geosciences Union EGU Année de publication : 2018 Collection : Geophysical Research Abstracts, ISSN 1607-7962 num. 20 Conférence : EGU 2018, General Assembly 08/04/2018 13/04/2018 Vienne Autriche OA Abstracts only Note générale : EGU2018-9714 Langues : Anglais (eng) Résumé : (auteur) We present a analysis of the 2011 Mw 9.0 Tohoku-oki earthquake gravity variations in a wide space-time window surrounding the event. We identify earthquake-related gravity signals by searching for transient variations near the time of the earthquake in GRACE-reconstructed time series of gravity gradients at different spatial scales. The gravity gradients are expressed in spherical frames rotated along the radial axis in order to enhance gravity variations according to different orientations. Applied to different sets of gravity field models, our analysis allows us to evidence anomalous gravity signals starting a few months before the rupture across the regional subduction system, which cannot be explained by mass redistributions from water cycle sources around Japan nor by GRACE striping. After the rupture, the gravity variations propagate far within the Pacific and the Philippine Sea plates interiors.We further test the presence of the pre-seismic signals by also applying a statistical analysis of the gravity gradient time series, without knowledge on the consecutive rupture. Our findings show that satellite gravity brings unique information to monitor major plate boundaries, which could be used in seismic hazard assessment. Numéro de notice : C2018-070 Affiliation des auteurs : LaSTIG LAREG+Ext (2012-mi2018) Thématique : POSITIONNEMENT Nature : Poster nature-HAL : Poster-avec-CL DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91462
Titre : ITRF and seasonal station motions Type de document : Article/Communication Auteurs : Zuheir Altamimi Editeur : Munich [Allemagne] : European Geosciences Union EGU Année de publication : 2018 Collection : Geophysical Research Abstracts, ISSN 1607-7962 num. 20 Conférence : EGU 2018, General Assembly 08/04/2018 13/04/2018 Vienne Autriche OA Abstracts only Note générale : EGU2018-5103 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes descripteurs IGN] International Terrestrial Reference Frame
[Termes descripteurs IGN] variation saisonnièreRésumé : (auteur) By definition, the International Terrestrial reference Frame (ITRF) is a secular frame providing station positions at a reference epoch and linear velocities. Considering the requirements of some scientific applications, such as precise orbit determination, it becomes however important to develop corrective models that can be added to the ITRF coordinates to account for non-linear station motions, with respect to the Earth Center of Mass (CM). It is in this perspective that post-seismic deformation models were, for instance, provided with the ITRF2014 solution. The next most important non-linear effect to be taken into account would be seasonal station motions. Seasonal station motions were estimated during the ITRF2014 construction, independently for each space geodetic technique. No attempt was made, however, to combine the seasonal signals estimated for the different techniques, and seasonal corrections were therefore not provided with the ITRF2014 solution. We explore here the feasibility of deriving meaningful combined seasonal corrections in the CM frame using two possible approaches: (1) combining the seasonal signals estimated for the different techniques during the ITRF2014 construction, (2) accumulating the time series of input solutions from the four techniques all together, with properly weighted equality constraints on seasonal signals at co-location sites. Results of the two approaches will be confronted and analyzed in order to evaluate the level of consistency of the technique seasonal signals at co-location sites. Conclusion will be drawn on the possible ways of providing seasonal corrections consistent with the next ITRF release. Numéro de notice : C2018-063 Affiliation des auteurs : LaSTIG LAREG (2012-mi2018) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComSansActesPubliés-Unpublished DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91397
Titre : ITRF2014 and Earth figure changes: evidence of global viscous relaxation in recent ice melting Earth’s response? Type de document : Article/Communication Auteurs : Laurent Métivier Editeur : Munich [Allemagne] : European Geosciences Union EGU Année de publication : 2018 Collection : Geophysical Research Abstracts, ISSN 1607-7962 num. 20 Conférence : EGU 2018, General Assembly 08/04/2018 13/04/2018 Vienne Autriche OA Abstracts only Note générale : EGU2018-7567 Langues : Anglais (eng) Résumé : (auteur) The latest solution of the International Terrestrial Reference Frame, entitled ITRF2014, presents particularly large vertical velocities across Greenland, South East Alaska and the Antarctic Peninsula, compared with the previous solution ITRF2008. We investigate here the geophysical origin of this evolution of the ITRF velocity field. From a selection of ITRF2014 GNSS vertical velocities we determine solid Earth figure changes and Earth’s geocenter motion at different dates. By exploring various geophysical models, we show that our estimations can be well explained by the deformation due to Glacial Isostatic Adjustment (GIA) and Recent Ice Melting (RIM). However, we also show that the obtained solid Earth oblateness is not consistent with J2-rate observations if we assume purely elastic RIM deformations.We explore here different rheological scenarios that may explain this discrepancy, including low viscosities in the asthenosphere and/or the D” layer, or possible phase transitions in the mantle transition zone. Numéro de notice : C2018-071 Affiliation des auteurs : LaSTIG LAREG (2012-mi2018) Thématique : POSITIONNEMENT Nature : Poster nature-HAL : Poster-avec-CL DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91463 PermalinkPermalinkPermalinkPermalinkGeoscientific instrumentation methods and data systems (2012 -)
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