Centre de documentation
scientifique

Dépouillements

Densification of the ground-based GNSS observation network in the Southwest Indian Ocean: current status, perspectives, and examples of applications in meteorology and geodesy / Olivier Bousquet in Frontiers in Earth Science, vol 8 (September 2020)  

Public [article]  inFrontiers in Earth Science > vol 8 (September 2020) . - n° 566105 Titre : Densification of the ground-based GNSS observation network in the Southwest Indian Ocean: current status, perspectives, and examples of applications in meteorology and geodesy Type de document : Article/Communication Auteurs : Olivier Bousquet, Auteur ; Edouard Lees, Auteur ; Jonathan Durand, Auteur ; Aline Peltier, Auteur ; Anne Duret , Auteur ; Dominique Mekies, Auteur ; Patrice Boissier, Auteur ; Thomas Donal, Auteur ; Frauke Fleischer-Dogley, Auteur ; Lova Zakariasy, Auteur Année de publication : 2020 Projets : IOGA4MET-EI / Bousquet, Olivier Article en page(s) : n° 566105 Note générale : bibliographie project “IOGA4MET-EI” funded by the research consortium “Iles Eparses” 2017–2020 Langues : Anglais (eng) Résumé : (auteur) In the frame of the research project IOGA4MET, a new ground-based GNSS network is being deployed in the Southwest Indian Ocean (SWIO) since November 2017. This new network opens up for new research opportunities in geodesics and atmospheric sciences in this area regularly exposed to natural hazards, and significantly expands the International GNSS System (IGS) network, which only includes eight stations so far in the SWIO. After a description of the current status of IOGA4MET, several examples of regional applications in meteorology (climatology and numerical modeling) and geodesy (monitoring of ground deformations) are presented using data collected in northern Madagascar and small neighboring islands in 2018–2020. The observed water vapor cycle is shown to exhibit different characteristics and important variability at all locations. At the seasonal scale, maximum IWV values are similar everywhere, minimum values decrease away from the equator and a sharp IWV gradient can be noticed during the wet–dry transition period. At this time scale, the seasonal IWV cycle analyzed with the high-resolution NWP system AROME-IO matches observations with little discrepancies. At the diurnal scale, IWV characteristics show different behavior on each side of Madagascar, which emphasizes the important role of this island in driving the regional circulation. Finally, examination of ground displacements measured by GNSS stations in relationship with the ongoing Mayotte seismic-volcanic crisis indicates that ground deformation associated with the current off-shore volcanic activity east of Mayotte does not extend up to 250 km, or is currently too low to be detected in very far field. Numéro de notice : A2020-334 Affiliation des auteurs : IGN+Ext (2020- ) Autre URL associée : correction de l'article Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.3389/feart.2020.566105 Date de publication en ligne : 04/09/2020 En ligne : https://doi.org/10.3389/feart.2020.566105 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=96884 [article]