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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Acknowledgements
This study was supported by ECGS (European Center for Geodynamics and Seismology) (project title: Ground truth in gravity: a null test experiment in the Sahara to validate GRACE) and by French-Egyptian Imhotep program (project title: Continuous Gravity Observations Around Northern Western Part of Lake Nasser, Aswan, Egypt). This research was supported by CNES (Centre National des Etudes Spatiales), France (TOSCA grant).
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Hinderer, J. et al. (2017). Ground-Satellite Comparisons of Time Variable Gravity: Results, Issues and On-Going Projects for the Null Test in Arid Regions. In: Freymueller, J.T., Sánchez, L. (eds) International Symposium on Earth and Environmental Sciences for Future Generations. International Association of Geodesy Symposia, vol 147. Springer, Cham. https://doi.org/10.1007/1345_2017_266
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DOI: https://doi.org/10.1007/1345_2017_266
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