|Paper title||GravIS Portal: User-friendly Global Mass Variations from GRACE and GRACE-FO|
|Form of presentation||Poster|
The German Research Centre for Geosciences (GFZ) maintains the “Gravity Information Service” (GravIS, gravis.gfz-potsdam.de) portal in collaboration with the Technische Universität Dresden and the Alfred-Wegener-Institute (AWI). The essential objective of this portal is the dissemination of user-friendly mass variation data in the Earth system based on observations of the German-US American satellite gravimetry missions GRACE (Gravity Recovery and Climate Experiment, 2002-2017) and its successor GRACE-FO (GRACE-Follow-On, since 2018).
The provided data sets comprise products of mass changes of the ice sheets in Greenland and Antarctica, terrestrial water storage (TWS) variations over the continents, and ocean bottom pressure (OBP) variations from which global mean barystatic sea-level rise can be estimated. All data sets are provided as time series of regular grids, as well as in the form of regional basin averages. The ice-mass change is provided either on a regular 50km by 50km stereographic grid or as basin averages which are accompanied by realistic uncertainties. The gridded continental TWS data, as well as the OBP data, are given on a 1° by 1° grid. For continental TWS data, the user can choose between river discharge basins and segmentation based on climatically similar regions. All regional mean time series of the TWS product are accompanied by realistic uncertainty estimates. The OBP data set is composed of a barystatic sea-level map and a map of the residual ocean circulation which was not reduced by background models in the data processing. These background models are also provided for all three data products.
The data sets of all domains can be interactively displayed at the portal and are freely available for download. This contribution aims to show the features and possibilities of the GravIS portal to researchers without a dedicated geodetic background in the fields of climatology, hydrology, cryosphere, or oceanography. The data provided on the portal will also be used within the GRACE-FO project of the ESA Third Party Mission Program.