BOURDA, G.

doi:10.1007/S00190-007-0180-Y

Métadonnées

Licence d’utilisation du document

BOURDA, G.
Observatoire aquitain des sciences de l'univers [OASU]
Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]

Langue

Article de revue

Ce document a été publié dans

Journal of Geodesy. 2008, vol. 82, n° 4-5, p. 295-305

Springer Verlag

Résumé en anglais

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.< Réduire

Métadonnées

Licence d’utilisation du document

Length-of-day and space-geodetic determination of the Earth's variable gravity field

Langue

Ce document a été publié dans

Résumé en anglais

DOI

Origine

Unités de recherche