The quest for a consistent signal in ground and GRACE gravity time-series
- Author(s)
- Michel van Camp, Oliver de Viron, Laurent Metivier, Bruno Meurers, Olivier Francis
- Abstract
Recent studies show that terrestrial and space-based observations of gravity agree over Europe. In this paper, we compare time-series of terrestrial gravity (including the contribution due to surface displacement) as measured by superconducting gravimeters (SGs), space-based observations from Gravity Recovery and Climate Experiment (GRACE) and predicted changes in gravity derived from two global hydrological models at 10 SG stations in central Europe. Despite the fact that all observations and models observe a maximum in the same season due to water storage changes, there is little agreement between the SG time-series even when they are separated by distances smaller than the spatial resolution of GRACE. We also demonstrate that GRACE and the SG observations and the water storage models do not display significant correlation at seasonal periods nor at interannual periods. These findings are consistent with the fact that the SGs are sensitive primarily to mass changes in the few hundred metres surrounding the station.
- Organisation(s)
- Department of Meteorology and Geophysics
- External organisation(s)
- Royal Observatory of Belgium, Université de Paris, Institut Geographique National (IGN), University of Luxembourg
- Journal
- Geophysical Journal International
- Volume
- 197
- Pages
- 192-201
- No. of pages
- 10
- ISSN
- 0956-540X
- DOI
- https://doi.org/10.1093/gji/ggt524
- Publication date
- 04-2014
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 105206 Meteorology
- Keywords
- ASJC Scopus subject areas
- Geochemistry and Petrology, Geophysics
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/f832aae7-ae87-4b40-abc8-6c2003085d5d