Temporal Gravity Variations in GOCE Gradiometric Data

verfasst von
F. Jarecki, J. Müller, S. Petrovic, P. Schwintzer
Abstract

The accuracy and spatial resolution expected from GOCE gravity gradiometry might deteriorate due to temporal gravity variations, which are mainly induced by mass redistributions in the System Earth. These mass redistributions occur in the atmosphere at various time scales, in the oceans as ocean tides and currents and on the continents as solid Earth tides, loading and hydrological effects. Opposite to GRACE, GOCE is developed to measure the static gravity field. Therefore, any time variable effects have to be removed from the measured data prior to further processing in a dealiasing step. In this report the effects mentioned above are analysed by means of available models in order to investigate if they deliver significant contributions to the GOCE gradiometer measurements. Simulations of the different system parts (Atmosphere, Hydrosphere, Cryosphere and Solid Earth) are run. The gravitational effect of the simulated mass changes is expanded into spherical harmonics from which gravitational gradients are computed along a simulated GOCE orbit. The resulting gradients are compared with the specifications of the GOCE gradiometer. Furthermore, the residual (i.e. atmospheric and oceanic parts removed) time variable part of the gravity field as detected by GRACE is discussed with respect to its impact on GOCE gradiometry.

Organisationseinheit(en)
Institut für Erdmessung
Externe Organisation(en)
Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum (GFZ)
Typ
Artikel
Journal
International Association of Geodesy Symposia
Band
129
Seiten
333-338
Anzahl der Seiten
6
ISSN
0939-9585
Publikationsdatum
09.2005
Publikationsstatus
Veröffentlicht
Peer-reviewed
Ja
ASJC Scopus Sachgebiete
Computer in den Geowissenschaften, Geophysik
Elektronische Version(en)
https://doi.org/10.1007/3-540-26932-0_58 (Zugang: Unbekannt)
 

Details im Forschungsportal „Research@Leibniz University“