International Combination Service for Time-Variable Gravity Fields (COST-G)

Start of Operational Phase and Future Perspectives

authored by
Adrian Jäggi, Ulrich Meyer, Martin Lasser, Barbara Jenny, Teodolina Lopez, Frank Flechtner, Christoph Dahle, Christoph Förste, Torsten Mayer-Gürr, Andreas Kvas, Jean Michel Lemoine, Stéphane Bourgogne, Matthias Weigelt, Andreas Groh

The International Combination Service for Time-variable Gravity Fields (COST-G) is a new Product Center of IAG’s International Gravity Field Service (IGFS). COST-G provides consolidated monthly global gravity fields in terms of spherical harmonic coefficients and thereof derived grids of surface mass changes by combining existing solutions or normal equations from COST-G analysis centers (ACs) and partner analysis centers (PCs). The COST-G ACs adopt different analysis methods but apply agreed-upon consistent processing standards to deliver time-variable gravity field models, e.g. from GRACE/GRACE-FO low-low satellite-to-satellite tracking (ll-SST), GPS high-low satellite-to-satellite tracking (hl-SST) and Satellite Laser Ranging (SLR). The organizational structure of COST-G and results from the first release of combined monthly GRACE solutions covering the entire GRACE time period are discussed in this article. It is shown that by combining solutions and normal equations from different sources COST-G is taking advantage of the statistical properties of the various solutions, which results in a reduced noise level compared to the individual input solutions.

Institute of Geodesy
External Organisation(s)
University of Bern
Helmholtz Centre Potsdam - German Research Centre for Geosciences
Graz University of Technology
Centre national d’études spatiales (CNES)
Esplanade Compans Caffarelli
Technische Universität Dresden
Conference contribution
No. of pages
Publication date
Publication status
Peer reviewed
ASJC Scopus subject areas
Computers in Earth Sciences, Geophysics
Electronic version(s) (Access: Open)

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