Abstract
A GWR superconducting gravimeter of the new generation (OSG-60) has been installed in July 2010 in sub-humid West Africa, at the Djougou station in Benin. This station is located in the AMMA-CATCH long term hydrological observing system. We present the first results in terms of instrumental drift as well as the calibration results using FG5 absolute gravity measurements. We show that geophysical contributions due to hydrological load can bias the initial drift estimate. The noise level is compared to the Strasbourg SG as well as to the reference New Low Noise Model (NLNM) used in seismology. We also investigate the gravity response to atmospheric pressure changes and show that, because of the presence of large thermal tides, the gravity response to mass changes in the atmosphere is more complex than in the simple case of a constant barometric admittance.
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Acknowledgments
The installation of the SG in Benin was funded by the French Agence Nationale de la Recherche (ANR) during the 4 year (2008–2011) GHYRAF project and by CNRS- INSU (Institut National des Sciences de l’Univers). We also acknowledge financial support from the Centre National d’Etudes Spatiales (CNES). The GLDAS data used in this study were acquired as part of the mission of NASA Earth Science Division and archived and distributed by the Goddard Earth Sciences (GES) Data and Information Services Center (DISC). We thank the Institut de Recherche pour le Développement (IRD) and the Direction Générale de l’Eau (Ministry of Mines, Energy and Water) in Benin for the strong logistic and manpower support.
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Hinderer, J. et al. (2014). Preliminary Results from the Superconducting Gravimeter SG-060 Installed in West Africa (Djougou, Benin). In: Rizos, C., Willis, P. (eds) Earth on the Edge: Science for a Sustainable Planet. International Association of Geodesy Symposia, vol 139. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-37222-3_55
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DOI: https://doi.org/10.1007/978-3-642-37222-3_55
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