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In Antarctica, solid-earth deformation can be attributed to various processes such as surface load variations mainly caused by present-day (elastic deformation) and past ice-mass changes (glacial isostatic adjustment) or tectonic processes. Geodetic GNSS observations on bedrock provide a powerful tool to assess these deformations. Multiple studies have already utilized GNSS to derive bedrock motion for Antarctica, but were limited to specific regions and time periods.
The SCAR-endorsed project GIANT-REGAIN aims to re-process all available Antarctic GNSS data that have been acquired by episodic and permanent recordings at bedrock for more than 25 years. We succeeded to include more than 280 sites providing recordings between 1995 and 2021.
We will report on the data acquisition and on the treatment of metadata, which are indispensable for a correct assignment of the hardware setup. In the processing precise point positioning (PPP) and differential GNSS are applied using different scientific software packages (GIPSY, GAMIT, Bernese). As a major product, time series of consistent point coordinates will be inferred.
The comparison of the different processing solutions allows assessment of the uncertainty and to estimate the ‘software noise’.