EGU21-2416, updated on 12 Jan 2022
https://doi.org/10.5194/egusphere-egu21-2416
EGU General Assembly 2021
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Combination Service for Time-variable Gravity Fields (COST-G): operational GRACE-FO combination and validation of Chinese GRACE time-series

Ulrich Meyer1, Martin Lasser1, Adrian Jäggi1, Christoph Dahle2, Frank Flechtner2, Andreas Kvas3, Saniya Behzadpour3, Torsten Mayer-Gürr3, Jean-Michel Lemoine4, Igor Koch5, Jakob Flury5, Stephane Bourgogne6, Andreas Groh7, Annette Eicker8, Christoph Förste2, Zhicai Luo10, Jiangjun Ran11, Yunzhong Shen12, Qile Zhao13, Wei Feng14,15, and the COST-G Team*
Ulrich Meyer et al.
  • 1University of Bern, Astronomical Institute, Bern, Switzerland (ulrich.meyer@aiub.unibe.ch)
  • 2GFZ German Research Centre for Geosciences, Germany
  • 3Graz University of Technology, Austria
  • 4Centre National d’Etudes Spatiales, France
  • 5Leibniz University Hannover, Germany
  • 6Stellar Space Studies, France
  • 7Institute of planetary geodesy, Technical University of Dresden, Germany
  • 8HafenCity University Hamburg, Germany
  • 10Institute of Geophysics, School of Physics, Huazhong University of Science and Technology, China
  • 11Department of Earth and Space Sciences, Southern University of Science and Technology, China
  • 12College of Surveying and Geo-informatics, Tongji University, Shanghai, China
  • 13GNSS Research Center, Wuhan University, China
  • 14Institute of Geodesy and Geophysics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, China
  • 15School of Geospatial Engineering and Science, Sun Yat-sen University, China
  • *A full list of authors appears at the end of the abstract

The Combination Service for Time-variable Gravity Fields (COST-G) of the International Association of Geodesy (IAG) provides combined monthly gravity fields of its associated and partner Analysis Centers (ACs). In November 2020, the combination of monthly GRACE-FO gravity fields started its operational mode, providing consolidated L2 (spherical harmonics) and L3 (gridded and post- processed) products with a latency of currently 3 months. We present an overview and quality assessment of the available products.

COST-G aims at the extension of its service to include further GRACE and GRACE-FO analysis centers. In January 2020 a collaboration with representatives of five Chinese ACs was initiated, who provided GRACE time-series according to the COST-G requirements. We present the results of a test combination with the Chinese AC models, including comparison and quality assessment of all contributing time-series and validation of the combined gravity fields.

COST-G Team:

Ulrich Meyer, Martin Lasser, Adrian Jäggi: University of Bern, Astronomical Institute, Bern, Switzerland; Frank Flechtner, Christoph Dahle, Christoph Förste: GFZ German Research Centre for Geosciences, Germany; Torsten Mayer- Gürr, Andreas Kvas, Saniya Behzadpour: Graz University of Technology, Austria; Jean-Michel Lemoine: Centre National d’Etudes Spatiales, France; Igor Koch, Jakob Flury: Leibniz University Hannover, Germany; Stéphane Bourgogne: Stellar Space Studies, France; Andreas Groh: Institute of planetary geodesy, Technical University of Dresden, Germany; Annette Eicker: HafenCity University Hamburg, Germany; Benoit Meyssignac: Laboratoire d’Etudes en Geophysique et Oceanographie Spatiales, France; Hao Zhou, Zhicai Luo: Institute of Geophysics, School of Physics, Huazhong University of Science and Technology, China; Zhengwen Yan, Jiangjun Ran: Department of Earth and Space Sciences, Southern University of Science and Technology, China; Qiujie Chen, Yunzhong Shen: College of Surveying and Geo-informatics, Tongji University, Shanghai, China; Xiang Guo, Qile Zhao: GNSS Research Center, Wuhan University, China; Changqing Wang, Min Zhong: Institute of Geodesy and Geophysics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, China; Wei Feng: Institute of Geodesy and Geophysics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, and China School of Geospatial Engineering and Science, Sun Yat-sen University, China

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