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Length-of-day and space-geodetic determination of the Earth's variable gravity field / G. Bourda in Journal of geodesy, vol 82 n° 4-5 (April - May 2008)  

Public [article]  inJournal of geodesy > vol 82 n° 4-5 (April - May 2008) . - pp 295 - 305 Titre : Length-of-day and space-geodetic determination of the Earth's variable gravity field Type de document : Article/Communication Auteurs : G. Bourda, Auteur Année de publication : 2008 Article en page(s) : pp 295 - 305 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] analyse comparative [Termes IGN] champ de pesanteur terrestre [Termes IGN] données GRACE [Termes IGN] données TLS (télémétrie) [Termes IGN] GRACE [Termes IGN] télémétrie laser sur satellite [Termes IGN] variation Résumé : (Auteur) The temporal variations of the Earth’s gravity field, nowadays routinely determined from satellite laser ranging (SLR) and GRACE (Gravity Recovery And Climate Experiment), are related to changes in the Earth’s rotation rate through the Earth’s inertia tensor. We study this connection from actual data by comparing the traditional length-of-day (LOD) measurements provided by the International Earth Rotation and Reference Systems Service (IERS) to the variations of the degree-2 and order-0 Stokes coefficient of the gravity field determined from fitting the orbits of the LAGEOS-1 and -2 satellites since 1985. The two series show a good correlation (0.62) and similar annual and semi-annual signals, indicating that the gravity-field-derived LOD is valuable. Our analysis also provides evidence for additional signals common to both series, especially at a period near 120 days, which could be due to hydrological effects. Copyright Springer Numéro de notice : A2008-171 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-007-0180-y En ligne : https://doi.org/10.1007/s00190-007-0180-y Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29166 [article]

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