- 1University of Bern, Astronomical Institute, Bern, Switzerland (ulrich.meyer@unibe.ch)
- 2German Research Centre for Geosciences, Germany
- 3Graz University of Technology, Institute of Geodesy, Austria
- 4Centre National d’Etudes Spatiales, Department of Terrestrial and Planetary Geodesy, France
- 5Stellar Space Studies, France
- 6Technical University of Dresden, Institute of Planetary Geodesy, Germany
- 7Huazhong University of Science and Technology, Institute of Geophysics, China
- 8Southern University of Science and Technology, Department of Earth and Space Sciences, China
- 9Tongji University, College of Surveying and Geo-informatics, China
- 10Chinese Academy of Sciences, Innovation Academy for Precision Measurement Science and Technology
- 11Sun Yat-sen University, School of Geospatial Engineering and Science, China
The Combination Service for Time-variable Gravity fields (COST-G) of the IAG looks back at an eventful and very successful year. The operational combination of the monthly GRACE-FO gravity fields now comprises eight analysis centers, providing high-quality solutions with short latency on a regular basis. When the new release 06.3 of the GRACE-FO Science Data System (SDS) time-series became available in September 2024, COST-G generated test combinations and could confirm the quality gain compared to the former release 06.2. Meanwhile, release 06.3 is routinely incorporated in the operational combination.
The number of analysis centers providing complete time-series of monthly gravity fields of the GRACE mission to COST-G has more than doubled compared to the original COST-G GRACE RL01, published in 2019. The current COST-G GRACE RL02 is a
weighted combination of 11 time-series, where the weighting scheme was adapted to be consistent with the operational GRACE-FO combination. The quality gain of the new combination is most pronounced during the early and late GRACE mission period, when data quality issues and environmental conditions were challenging.
How to cite: Meyer, U., Jäggi, A., Lasser, M., Dahle, C., Flechtner, F., Boergens, E., Foerste, C., Öhlinger, F., Mayer-Gürr, T., Lemoine, J.-M., Bourgogne, S., Döhne, T., Zhou, H., Ran, J., Chen, Q., Wan, C., and Feng, W.: COST-G: Status and new developments, EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-15499, https://doi.org/10.5194/egusphere-egu25-15499, 2025.
