Drews, Reinhard; Wild, Christian T; Marsh, Oliver; Rack, Wolfgang; Ehlers, Todd A; Neckel, Niklas; Helm, Veit (2021): GNSS Data collected at Priestley Glacier November 2018 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.936090
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Abstract:
This is GNSS data of four stations covering the grounding zone of Priestley Glacier Antarctica.
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.
Related to:
Drews, Reinhard; Wild, Christian T; Marsh, Oliver; Rack, Wolfgang; Ehlers, Todd A; Neckel, Niklas; Helm, Veit (accepted): Grounding-zone flow variability of Priestley Glacier, Antarctica, in a diurnal tidal regime. Geophysical Research Letters
Project(s):
Funding:
Horizon 2020 (H2020), grant/award no. 689443: The European network for observing our changing planet
Coverage:
Median Latitude: -74.438066 * Median Longitude: 163.441678 * South-bound Latitude: -74.526042 * West-bound Longitude: 163.418165 * North-bound Latitude: -74.393382 * East-bound Longitude: 163.458025
Date/Time Start: 2018-11-01T02:28:12 * Date/Time End: 2018-12-29T23:25:26
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
4 datasets
Download Data
Datasets listed in this publication series
- Drews, R; Wild, CT; Marsh, O et al. (2021): GNSS Data collected at Priestley Glacier November 2018, Blake. https://doi.org/10.1594/PANGAEA.936088
- Drews, R; Wild, CT; Marsh, O et al. (2021): GNSS Data collected at Priestley Glacier November 2018, Hillary. https://doi.org/10.1594/PANGAEA.935961
- Drews, R; Wild, CT; Marsh, O et al. (2021): GNSS Data collected at Priestley Glacier November 2018, Shirase. https://doi.org/10.1594/PANGAEA.936084
- Drews, R; Wild, CT; Marsh, O et al. (2021): GNSS Data collected at Priestley Glacier November 2018, Tuati. https://doi.org/10.1594/PANGAEA.936089