We will focus on the development of global background models of atmosphere and ocean dynamics that are applicable to gravity records taken anywhere at the Earth’s surface. The background models will be split into

- deformation effects that also consider the laterally heterogeneous rheology of the Earth’s crust;
- regional-to-global attraction effects of both atmospheric and oceanic mass variability along the strategy outlined by; and
- the local effects from the direct vicinity of the sensor that are most sensible to the local topographic roughness and that might benefit most from a possible augmentation with barometric observations taken around the gravity sensor.

We will also consider the requirements on geophysical signal separation of any new technology developed in TerraQ sensitive to time-variable gravity changes (e.g., clock comparisons via optical fibres over large distances; new satellite concepts; VLBAI) and provide prototype correction models for atmospheric effects in those measurements as well. Specific attention will be paid to the long-term consistency of the background models to allow for the low-frequency signal separation over many decades.