Line-of-Sight Velocities of Priestley Glacier, Antarctica, aquired with Terrestrial Radar Interferometry
These data were aquired with a Terrestrial Radar Interferometer overlooking the grounding zone of Priestley Glacier, Antarctica. The time series contains line-of-sight velocities averaged over 3 h over an approximately 8 day period in November 2018. Tidal modulation of ice streams and their adjacent...
| Main Authors: | , , , , , , |
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| Format: | Dataset |
| Language: | English |
| Published: |
PANGAEA
2021
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| Subjects: | |
| Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.935702 https://doi.org/10.1594/PANGAEA.935702 |
| Summary: | These data were aquired with a Terrestrial Radar Interferometer overlooking the grounding zone of Priestley Glacier, Antarctica. The time series contains line-of-sight velocities averaged over 3 h over an approximately 8 day period in November 2018. Tidal modulation of ice streams and their adjacent ice shelves is a real-world experiment to understand ice-dynamic processes. We observe the dynamics of Priestley Glacier, Antarctica, using Terrestrial Radar Interferometry (TRI) and GNSS. Ocean tides are predominantly diurnal but horizontal GNSS displacements oscillate also semi-diurnally. The oscillations are strongest in the ice shelf and tidal signatures decay near-linearly in the TRI data over >10 km upstream of the grounding line. Tidal flexing is observed >6 km upstream of the grounding line including cm-scale uplift. Tidal grounding line migration is small and <40 % of the ice thickness. The frequency doubling of horizontal displacements relative to the ocean tides is consistent with variable ice-shelf buttressing demonstrated with a visco-elastic Maxwell model. Taken together, this supports previously hypothesized flexural ice softening in the grounding-zone through tides and offers new observational constraints for the role of ice rheology in ice-shelf buttressing. |
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