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Combining global hlSST and SLR to bridge the gap between GRACE and GRACE-Follow

Authors

Weigelt,  Matthias
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Jäggi,  Adrian
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Meyer,  Ulrich
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Arnold,  Daniel
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Mayer-Gürr,  Torsten
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Öhlinger,  Felix
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Sośnica,  Krzysztof
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ebadi,  Sahar
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Steffen,  Holger
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Weigelt, M., Jäggi, A., Meyer, U., Arnold, D., Mayer-Gürr, T., Öhlinger, F., Sośnica, K., Ebadi, S., Steffen, H. (2023): Combining global hlSST and SLR to bridge the gap between GRACE and GRACE-Follow, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3223


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020591
Abstract
GRACE and GRACE-Follow On time series suffer from a data gap of about one year and there is the need for an intermediate technique that will bridge the gap between the two missions. The combination of high-low satellite-to-satellite tracking (hlSST) of low-Earth orbiting satellites by GNSS in combination with SLR is the most promising candidate and will allow 1) for a continued and uninterrupted time series of mass observations and 2) to compare, cross-validate and link the two time series. SLR is known to provide highest quality time-variable gravity for the very low degrees (2-5) and hlSST is able to provides a higher spatial resolution at a lower precision in the very low degrees. Here, we present a complete series of time-variable gravity field solution based on high-low satellite-to-satellite tracking and satellite laser ranging that covers the time from 2003 till 2022 including the gap period between the end of the GRACE mission in 2017 and the first available solutions of GRACE-Follow On in 2018.