Assessing the stability of AOD1B atmosphere–ocean non-tidal background modelling for climate applications of satellite gravity data: long-term trends and 3-hourly tendencies

SUMMARY The GRACE Atmosphere and Ocean Level-1B (AOD1B) product is routinely applied in the processing of satellite gravimetry data to mitigate impact temporal aliasing. Spurious trends, low-frequency signals or bias jumps background model can, if unaccounted for, introduce biases into global gravity solutions which might be interpreted erroneously subsequent geophysical analyses. Here, we examine most recent release, RL07, AOD1B for such artefacts. A focus placed on transition from atmospheric re-analysis ERA5 operational weather data, January 2018, coincides with gap between missions GRACE-FO. We find that linear trends computed 1975 2020 are well below 30 Pa a–1 all components RL07. assessment 3-hourly tendencies gives no indication shows does not have an adverse effect consistency conclude a comparison variability both RL06 RL07 context their application gravimetry.