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Combination Service for Time-variable Gravity Fields (COST-G) – operations

Urheber*innen

Meyer,  Ulrich
External Organizations;

Jäggi,  Adrian
External Organizations;

/persons/resource/flechtne

Flechtner,  Frank
1.2 Global Geomonitoring and Gravity Field, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/dahle

Dahle,  C.
1.2 Global Geomonitoring and Gravity Field, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Mayer-Gürr,  Torsten
External Organizations;

Kvas,  Andreas
External Organizations;

Lemoine,  Jean-Michel
External Organizations;

Bourgogne,  Stéphane
External Organizations;

Groh,  Andreas
External Organizations;

Eicker,  Annette
External Organizations;

Meyssignac,  Benoit
External Organizations;

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Zitation

Meyer, U., Jäggi, A., Flechtner, F., Dahle, C., Mayer-Gürr, T., Kvas, A., Lemoine, J.-M., Bourgogne, S., Groh, A., Eicker, A., Meyssignac, B. (2020): Combination Service for Time-variable Gravity Fields (COST-G) – operations - Abstracts, EGU General Assembly 2020 (Online 2020).
https://doi.org/10.5194/egusphere-egu2020-10380


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5002490
Zusammenfassung
With the release of the combined GRACE monthly gravity field time-series COST-G RL01 the Combination Service for Time-variable Gravity fields (COST-G) of the International Association of Geodesy (IAG) became operational in July 2019. We present the COST-G RL01 time-series and provide validation in terms of orbit fit, ice mass trends, lake altimetry and sea level budget. We identify weak points in the combined monthly gravity fields and discuss possible improvements of the combination strategy for future combinations. While COST-G RL01 is based on sets of re-processed GRACE monthly gravity fields, COST-G also provides combinations of monthly Swarm high-low satellite-to-satellite tracking (hl-SST) gravity fields on an operational basis with a latency of 3 months. Combinations of GRACE-FO monthly gravity fields are in the process of operationalization. We provide a status report and first results of GRACE-FO combinations. Combined GRACE, Swarm and GRACE-FO gravity fields complement each other to provide a long-term time-series of mass variation in the system Earth.