Abstract
<p>The Atmosphere and Ocean non-tidal De-aliasing Level-1B (AOD1B) product is widely used in satellite gravimetry to correct for transient effects of atmosphere-ocean mass variability that would otherwise alias into monthly-mean global gravity fields. The most recent release is based on the global ERA5 reanalysis and ECMWF operational data together with simulations from the general ocean circulation model MPIOM consistently forced with fields of the same atmospheric data-set.</p><p>While the newly released AOD1B RL07 improves over its predecessors in several aspects, residual uncertainties in the modelled mass variations remain. Especially for the oceanic component the poorly developed ocean observing system for rapid wind-driven flow results in larger uncertainties compared to the atmospheric component. In addition, the last uncertainty assessment of AOD1B is based on data from RL05 which is now believed to be too pessimistic.<br>We present results from an MPIOM based ensemble study that varies the atmospheric forcing by using the ERA5, MERRA2 and JRA55 reanalyses, as well as the initial conditions of the simulation. This will allow for an assessment of the residual errors in the oceanic component of AOD1B RL07 and can be used in the computation of spatial error covariance matrices for the rigorous incorporation of stochastic information into the gravity field estimation process. </p>
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