EGU22-2976, updated on 02 Jan 2024
EGU General Assembly 2022
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

COST-G: Status and recent developments

Adrian Jaeggi1, Ulrich Meyer1, Heike Peter10, Joao Teixeira Encarnacao11, Martin Lasser1, Frank Flechtner2, Christoph Dahle2, Eva Boergens2, Christoph Förste2, Torsten Mayer-Gürr3, Andreas Kvas3, Saniya Behzadpour3, Jean-Michel Lemoine4, Stéphane Bourgogne5, Igor Koch6, Jakob Flury6, Andreas Groh7, Annette Eicker8, Alejandro Blazquez9, and Benoit Meyssignac9
Adrian Jaeggi et al.
  • 1University of Bern, Astronomical Institute, Berne, Switzerland
  • 2German Research Centre for Geosciences, Germany
  • 3Graz University of Technology, Austria
  • 4Centre National d’Etudes Spatiales, France
  • 5Stellar Space Studies, France
  • 6Leibniz University Hannover, Germany
  • 7Technical University of Dresden, Germany
  • 8HafenCity University Hamburg, Germany
  • 9Laboratoire d’Etudes en Geophysique et Oceanographie Spatiales, France
  • 10PosiTim UG, Germany
  • 11Delft University of Technology, the Netherlands

Three years after its inauguration we draw a very positive résumé of the work of IAG’s Combination Service for Time-variable Gravity Fields (COST-G). The operational combination of GRACE-FO monthly gravity fields runs flawlessly. All seven associated and partner analysis centres timely provide high quality gravity fields, the COST-G quality control returns reliable noise and signal assessment based on meanwhile almost 4 years of GRACE-FO data, and the evaluation confirms the robustness and low noise level of the combined products.

COST-G is a highly dynamic service that is further developed in the frame of the Horizon2020 project Global Gravity-Based Groundwater Product (G3P) project, where an alternative accelerometer transplant product was developed, which in COST-G test combinations showed a very positive effect on the C30 gravity field coefficient and led to a general noise reduction in the medium to high degree range. Moreover, a deterministic signal model based on the monthly combinations has been released for the first time in September 2021 as a new COST-G product. It is updated quarterly with the most recent GRACE-FO data and aims to support operational precise orbit determination of low Earth orbiters. For the near future an extension of COST-G to also include analysis centres from China is envisaged and plans go to a revised combination of the reprocessed GRACE time-series.

How to cite: Jaeggi, A., Meyer, U., Peter, H., Teixeira Encarnacao, J., Lasser, M., Flechtner, F., Dahle, C., Boergens, E., Förste, C., Mayer-Gürr, T., Kvas, A., Behzadpour, S., Lemoine, J.-M., Bourgogne, S., Koch, I., Flury, J., Groh, A., Eicker, A., Blazquez, A., and Meyssignac, B.: COST-G: Status and recent developments, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-2976,, 2022.