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DFG-SPP1889 Reconciling ocean mass change and GIA from satellite gravity and altimetry (OMCG)


01.10.2016 – 30.09.2022


DFG (Deutsche Forschungsgemeinschaft)


Prof. Dr.-Ing. Jürgen Kusche

M.Sc. Bernd Uebbing


The OMCG project aims to investigate variations in global (and regional) ocean mass change (OMC) which is part of the global sea level budget. GRACE has been instrumental for recent OMC estimates, and it is increasingly used in regional studies. Yet, published estimates of global OMC, from essentially the same GRACE data, vary from 1.2 to 2.0 mm/a. As part of the project we aim to investigate these differences especially with respect to 'direct' (GRACE only) and 'inverse' (joint inversion of GRACE and altimetry data) approaches. The central hypothesis of this project is that these discrepancies are mostly related to (1) method issues in the analysis of the GRACE data and (2) the unsolved problem of correcting for the effect of GIA. Consequently, we aim to resolve conflicting mass/steric sea level budget partitioning, as well as providing consolidated and consistent gridded OMC to the SPP and the community. More information at