Large scale surface loading signals from a GRACE, GPS and OBP combination

The movement of large masses, originating from hydrological and oceanographic variations, \ncauses detectable variations in gravity and surface deformation. These may be detected by \nsatellite gravimetry and a network of permanent GPS stations respectively. Alternatively, \nadditional information on ocean bottom pressure variations may be retrieved from simulations. \nWithin the JIGOG project (Surface mass redistribution from joint inversion of GPS site \ndisplacements, ocean bottom pressure models and GRACE global gravity models), we combine \nthe above data sources (GRACE, GPS and OBP) in order to retrieve improved surface loading \nestimates. This combination has the advantage that, for example, geocenter motion can be \nretrieved. Furthermore, the joint inversion also allows to mitigate datagaps to a certain extent. \nIn this study, we provide a brief overview of the methodology and results of the JIGOG project. \nWe discuss the estimated geocenter motion and focus on the use of GPS/OBP combinations in the \nevent of missing GRACE data. New simulation runs from the updated FESOM model are included \nin the discussion.