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Erschienen in:
Simulation of VLBI Observations to Determine a Global TRF for GGOS Kapitel lesen Erstes Kapitel lesen

2018 | OriginalPaper | Buchkapitel

Ground-Satellite Comparisons of Time Variable Gravity: Results, Issues and On-Going Projects for the Null Test in Arid Regions

verfasst von : J. Hinderer, J.-P. Boy, R. Hamidi, A. Abtout, E. Issawy, A. Radwan, K. Zharan, M. Hamoudi

Erschienen in: International Symposium on Earth and Environmental Sciences for Future Generations

Verlag: Springer International Publishing

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Abstract

This paper is devoted to the problem of the ground-satellite comparison of time-variable gravity. We first review the different methods used to validate satellite gravity observations (ground truth experiment) and point out possible issues. We first show results obtained in Europe where a moderate amplitude hydrological signal exists using both satellite (GRACE) and surface gravity measurements from the GGP (Global Geodynamics Project) network of superconducting gravimeters. We show also the nice agreement between ground and GRACE observations in Djougou (West Africa) where hydrological changes due to monsoon are important. We finally present on-going projects for the so-called ‘null test’ which is related to observations in a region with no (or very small) hydrological contribution to gravity. First results for the Sahara (Algeria) are reported and future missions in Egypt and Saudi Arabia briefly introduced.

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Metadaten
Titel
Ground-Satellite Comparisons of Time Variable Gravity: Results, Issues and On-Going Projects for the Null Test in Arid Regions
verfasst von
J. Hinderer
J.-P. Boy
R. Hamidi
A. Abtout
E. Issawy
A. Radwan
K. Zharan
M. Hamoudi
Copyright-Jahr
2018
Verlag
Springer International Publishing
Buch
International Symposium on Earth and Environmental Sciences for Future Generations

Print ISBN: 978-3-319-69169-5

Electronic ISBN: 978-3-319-69170-1

Copyright-Jahr: 2018

DOI
https://doi.org/10.1007/1345_2017_266