The second release of COST-G GRACE-FO combined monthly gravity fields

The Combination Service for Time-variable Gravity fields (COST-G) provides monthly gravity fields of the GRACE, GRACE-FO and Swarm satellite missions, which are derived by combination of the individual time-series of the analysis centers around the world. The GRACE-FO combination has been operationalized and further developed in the frame of the Horizon 2020 project Global Gravity-based Groundwater Product (G3P). A significant reduction of noise could be achieved by the adaption of the weighting scheme, the inclusion of the new AIUB-GRACE-FO-RL02 time-series, which makes use of empirical noise modelling techniques, and the use of an alternative accelerometer transplant product, which improved the determination of the C30 gravity field coefficient, important for the derivation of ice mass change in polar regions. We present the new time-series of combined GRACE-FO monthly gravity fields and compare it in terms of signal and noise content to the original RL01 combination.