ИСТИНА

Gravity Recovery and Climate Experiment (GRACE) satellites, launched 17.03.2002 from Plesetsk, finished their work 10.2017. 05.2018 GRACE-Follow-on mission was launched, it is providing a set of monthly Earth’s gravity field observations. They present a big interest for hydrological studies. Gravity data reflect changes, related to the groundwater redistribution, ice melting, and precipitation accumulation. However, de-stripping/filtering is required to use the GRACE data products. We apply Multichannel Singular Spectrum Analysis (MSSA, or extended EOF) technique to filter GRACE data and separate the principal components (PCs) of different periods. We performed data averaging over the large river basins of Russia and present some comparisons with ground measurements by absolute gravimeter and water level gauge stations.