Drews, Reinhard; Wild, Christian T; Marsh, Oliver; Rack, Wolfgang; Ehlers, Todd A; Neckel, Niklas; Helm, Veit (2021): Differential Interferograms of the grounding zone at Priestley Glacier, Antarctica, aquired with Terrestrial Radar Interferometry [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.935707
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Abstract:
These data were aquired with a Terrestrial Radar Interferometer overlooking the grounding zone of Priestley Glacier, Antarctica. The time series contains differential interferograms with a 12h temporal baseline covering 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.
Keyword(s):
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:
Latitude: -74.400000 * Longitude: 163.500000
Minimum Elevation: 100.0 m * Maximum Elevation: 100.0 m
Comment:
Time series of unwrapped interferograms with a 12h temporal baseline taken with a Terrestrial Radar Interferometer in November 2018 near the grounding zone of Priestley Glacier, Antarctica
- The Zip Archive contains 252 Geotiff raster files in geographic project (EPSG 4326)
- Each raster has 8793 x 2593 entries
- All digits preceding the *_12.0h.diff.geo.tif file ending relate to time of the acquisition in terms of the decimal day of year 2018
- The differential interferograms were unwrapped and converted into line-of-sight displacement in meters
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Basic curation (CurationLevelB)
Size:
218 MBytes