Drews, Reinhard; Wild, Christian T; Marsh, Oliver; Rack, Wolfgang; Ehlers, Todd A; Neckel, Niklas; Helm, Veit (2021): Line-of-Sight Velocities of Priestley Glacier, Antarctica, aquired with Terrestrial Radar Interferometry [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.935702
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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 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.
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
Coverage:
Latitude: -74.400000 * Longitude: 163.500000
Minimum Elevation: 100.0 m * Maximum Elevation: 100.0 m
Comment:
Time series of line-of-sight flowfields averaged over approximately three hours.
Data were taken with a Terrestrial Radar Interferometer in November 2018 at the grounding zone of Priestley Glacier, Antarctica
– The Zip Archive contains 288 Geotiff in South polar stereographic projection
– Each raster has 4027 x 4746 entries
– The file name details the approximately 3h time inverval of aquisition with Stack_YYYYMMDD_HHMMSS_YYYYMMDD_HHMMSS marking the beginning and end of the time interval, respectively.
- The line of sight velocities are given in meters per year
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Basic curation (CurationLevelB)
Size:
1.5 GBytes