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

Meyer, U.; Lasser, M.; Jäggi, A.; 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.; Meyssignac, B.; Zhou, H.; Yan, Z.; Chen, Q.; ... (April 2021). Combination Service for Time-variable Gravity Fields: operational GRACE-FO combination and validation of Chinese GRACE time-series (Unpublished). In: EGU 2021. online. Apr 19-30, 2021.

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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.

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