EGU General Assembly 2020
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Combination Service for Time-variable Gravity Fields (COST-G) – operations

Ulrich Meyer1, Adrian Jäggi1, Frank Flechtner2, Christoph Dahle2, Torsten Mayer-Gürr3, Andreas Kvas3, Jean-Michel Lemoine4, Stéphane Bourgogne5, Andreas Groh6, Annette Eicker7, and Benoit Meyssignac8
Ulrich Meyer et al.
  • 1University of Bern, Astronomical Institute, Bern, Switzerland (
  • 2GFZ German Research Centre for Geosciences, Germany
  • 3Graz University of Technology, Austria
  • 4Centre National d’Etudes Spatiales, France
  • 5Stellar Space Studies, France
  • 6Institute of planetary geodesy, Technical University of Dresden, Germany
  • 7HafenCity University Hamburg, Germany
  • 8Laboratoire d’Etudes en Geophysique et Oceanographie Spatiales, France

With the release of the combined GRACE monthly gravity field time-series COST-G RL01 the Combination Service for Time-variable Gravity fields (COST-G) of the International Association of Geodesy (IAG) became operational in July 2019. We present the COST-G RL01 time-series and provide validation in terms of orbit fit, ice mass trends, lake altimetry and sea level budget. We identify weak points in the combined monthly gravity fields and discuss possible improvements of the combination strategy for future combinations.

While COST-G RL01 is based on sets of re-processed GRACE monthly gravity fields, COST-G also provides combinations of monthly Swarm high-low satellite-to-satellite tracking (hl-SST) gravity fields on an operational basis with a latency of 3 months. Combinations of GRACE-FO monthly gravity fields are in the process of operationalization. We provide a status report and first results of GRACE-FO combinations. Combined GRACE, Swarm and GRACE-FO gravity fields complement each other to provide a long-term time-series of mass variation in the system Earth.

How to cite: Meyer, U., Jäggi, A., Flechtner, F., Dahle, C., Mayer-Gürr, T., Kvas, A., Lemoine, J.-M., Bourgogne, S., Groh, A., Eicker, A., and Meyssignac, B.: Combination Service for Time-variable Gravity Fields (COST-G) – operations, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-10380,, 2020.


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