Hydrospheric mass loading for Europe from GNSS vertical displacement and a hydrological model

The interpretation of hydrospheric changes in the context of climate change can be enhanced using Global Navigation Satellite System (GNSS) displacement time series (DTS) combined with the one of a hydrological model. Our methodology is based on a computationally filtering strategy called the Savitzky-Golay filter and applied to selected stations in Europe. We use the GNSS solutions provided by the International GNSS Service (IGS) and, for the first time, the Nevada Geodetic Laboratory (NGL). The new hybrid dataset shows a high correspondence with DTS derived from the Gravity Recovery and Climate Experiment (GRACE) gravity mission but allows the identification of local and station-specific effects. Prior to this analysis, we eliminate various effects such as non-tidal atmospheric and oceanic loadings, glacial isostatic adjustment, barystatic sea-level changes, or thermoelastic deformation from GNSS DTS.