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Abstract:
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.
As background models are inevitably imperfect, residual errors due to aliasing remain. Accounting for the uncertainties of the background model data has, however, proven to be a useful approach to mitigate the impact of residual aliasing. In light of the changes made in the new release of AOD1B, previous uncertainty assessments are deemed too pessimistic and need to be revisited. We here present a new time-series of true errors adapted for AOD1B RL07 for the application in satellite gravity field processing and simulation studies. It is based on model differences between state-of-the-art atmospheric reanalysis and an oceanic ensemble simulation using MPIOM to account for differences in forced as well as intrinsic oceanic variability.
