Long-Term Stability of AOD1B RL07

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.

To fully utilize the potential of geodetic data for climate applications, addressing long-term stability in background (or observation-reduction) models is critically important. In this contribution we assess the three hourly tendencies, trends and long-term variations of surface pressure as well as ocean bottom pressure in the new release 07 of AOD1B. Special focus is placed on the transition from ERA5 to ECMWF operational atmospheric data and the influence of model changes in the ECMWF data.