EGU22-5820, updated on 28 Mar 2022
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Bridging the gap between GRACE and GRACE-Follow On by the combination of HLSST and SLR

Matthias Weigelt1, Adrian Jäggi2, Ulrich Meyer2, Daniel Arnold2, Torsten Meyer-Gürr3, Bramha Dutt Vishwakarma4, Balaji Devaraju5, Holger Steffen6, Krzysztof Sosnica7, and Sahar Ebadi1
Matthias Weigelt et al.
  • 1Leibniz Universität Hannover, Institut für Erdmessung, Hannover, Germany (
  • 2Astronomical Institute, University Bern, Bern, Switzerland
  • 3Institute for Geodesy, Graz University of Technology, Graz, Austria
  • 4Indian Institute of Sciences, Bangalore, India
  • 5Department of Civil Engineering, IIT Kanpur, Kalyanpur, Uttar Pradesh, India
  • 6Lantmäteriet, Gävle, Sweden
  • 7Institute of Geodesy and Geoinformatics, Wroclaw University of Environmental and Life Sciences, Wroclaw, Poland

GRACE has been undoubtedly one of the most important sources to observe mass transport at global and regional scales. Within the COST-G project, GRACE and GRACE-Follow On gravity field solutions from various processing centers are being combined to further increase the spatial and temporal resolution. However, the GRACE and GRACE-Follow On time series suffer from a data gap of about one year. Thus, there is a need for an intermediate technique that will bridge the gap between the two missions 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. Here, we present a complete series that covers the gap period between the end of the GRACE mission in 2017 and the first available solutions of GRACE-Follow On in 2018. We will focus on the combination of high-low satellite-to-satellite tracking (hlSST) of low-Earth orbiting satellites by GNSS in combination with SLR. SLR is known to provide highest quality time-variable gravity for the very low degrees (2-5) and hlSST is able to provide a higher spatial resolution at a lower precision in the very low degrees. We discuss also the achievable spatial and temporal resolutions and possible applications in GIA and in interseasonal variation analysis. 

How to cite: Weigelt, M., Jäggi, A., Meyer, U., Arnold, D., Meyer-Gürr, T., Vishwakarma, B. D., Devaraju, B., Steffen, H., Sosnica, K., and Ebadi, S.: Bridging the gap between GRACE and GRACE-Follow On by the combination of HLSST and SLR, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-5820,, 2022.


Display file