Spectral assessment of isostatic gravity models against CHAMP, GRACE, GOCE satellite-only and combined gravity models

The availability of digital elevation databases representing the topographic and bathymetric relief with global homogeneous coverage and increasing resolution permits the computation of crust-related Earth gravity models, the so-called topographic/isostatic Earth gravity models (henceforth T/I model...

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Bibliographic Details
Published in:Acta geophysica 2014-08, Vol.62 (4), p.679-698
Main Authors: Tsoulis, Dimitrios, Patlakis, Konstantinos
Format: Article
Language:English
Subjects:
Assessments
CHAMP-only models
combined gravity models
Compensation
Earth
Earth and Environmental Science
Earth Sciences
Geophysics
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
GOCE (experiment)
GOCE-only models
GRACE (experiment)
GRACE-only models
Gravitation
Gravity
Mathematical models
Research Article
Spectra
Structural Geology
Topographic databases
topographic/isostatic gravity models
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Summary:The availability of digital elevation databases representing the topographic and bathymetric relief with global homogeneous coverage and increasing resolution permits the computation of crust-related Earth gravity models, the so-called topographic/isostatic Earth gravity models (henceforth T/I models). Although expressing the spherical harmonic content of the topographic masses, the interpretation purpose of T/I models has not been given the attention it deserves, apart from the fact that they express some degree of compensation to the observed spectrum of the topographic heights, depending on the kind of the applied compensation mechanism. The present contribution attempts to improve the interpretation aspects of T/I Earth gravity models. To this end, a rigorous spectral assessment is performed to a standard Airy/Heiskanen T/I model against different CHAllenging Minisatellite Payload (CHAMP), Gravity Recovery and Climate Experiment (GRACE), Gravity field and steadystate Ocean Circulation Explorer (GOCE) satellite-only, and combined gravity models. Different correlation bandwidths emerge for these four groups of satellite-based gravity models. The band-limited forward computation of the models using these bandwidths reproduces nicely the main features of the applied T/I model.
ISSN:1895-6572
1895-7455
DOI:10.2478/s11600-013-0176-3