SLR, GRACE and SWARM gravity field determination and combination

Meyer, Ulrich; Sosnica, Krzsztof; Andritsch, Florian; Dach, Rolf; Jäggi, Adrian; König, Daniel; Thaller, Daniela (April 2019). SLR, GRACE and SWARM gravity field determination and combination (Unpublished). In: EGU General Assembly 2019. Vienna, Austria. April 08-12, 2019.

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At the Astronomical Institute of the University of Bern (AIUB) long time-series (1995 - 2017) of low resolution (spherical harmonic degree/order 6) gravity field coefficients have been determined from a combination of LAGEOS and geodetic SLR satellites in low Earth orbit, namely: Beacon-C, Ajisai, Starlette, Stella, Larets, and Lares. Monthly gravity fields, excluding degree 1 terms, are co-estimated with orbits (10-day LAGEOS and 1-day LEO arcs), station coordinates, range biases, geocenter variations and Earth orientation parameters. For the period 2003-2016 also GRACE monthly gravity fields were produced at AIUB with a significantly higher resolution (degree/order 90). After truncation of the gravity field corresponding to SLR the derived mass variations match well in selected areas with strong mass transport signals and SLR can thus serve to shed light on mass transport in the pre-GRACE period. Finally monthly gravity fields have been determined from high-low tracking data of the three SWARM satellites and are combined with SLR at normal equation level. The combined gravity fields turn out to be well suited for Greenland ice mass observation at low spatial resolution and therefore bridge the gap between GRACE and GRACE-FO.

Item Type:

Conference or Workshop Item (Speech)

Division/Institute:

08 Faculty of Science > Institute of Astronomy

UniBE Contributor:

Meyer, Ulrich; Andritsch, Florian; Dach, Rolf and Jäggi, Adrian

Subjects:

500 Science > 520 Astronomy

Language:

English

Submitter:

Pierre Fridez

Date Deposited:

31 Jul 2019 16:31

Last Modified:

31 Jul 2019 16:31

Additional Information:

Presentation

BORIS DOI:

10.7892/boris.132229

URI:

https://boris.unibe.ch/id/eprint/132229

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