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 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.
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
Related Publication:
Drews, R., Wild, C. T., Marsh, O. J., Rack, W., Ehlers, T. A., Neckel, N., & Helm, V. (2021). Grounding-zone flow variability of Priestley Glacier, Antarctica, in a diurnal tidal regime. Geophysical Research Letters, 48, e2021GL093853. https://doi.org/10.1029/2021GL093853
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- Date (Creation)
- 2021-09-13T09:27:00
- Date (Publication)
- 2021-09-13T09:27:00
Identifier
- Identifier
- https://doi.org/10.1594/PANGAEA.935702
- Status
- completed Completed
- Maintenance and update frequency
- Not planned
- Keywords
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- PRIESTLEY GLACIER
- DIFFERENTIAL INTERFEROMETRY
- TERRESTRIAL RADAR INTERFEROMETRY
- GCMD Earth Science and Earth Science Services Keywords
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- OCEANS
- GLACIERS
- TIDES
- GLACIER MOTION/ICE SHEET MOTION
- GCMD Platform/Sources Keywords
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- Global Positioning System (GPS)
- GCMD Instrument/Sensors Keywords
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- GPS
- GNSS
- Radar
- GCMD Locations Keywords
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- ANTARCTICA
- Use limitation
- This data set conforms to the CC BY Attribution License (https://creativecommons.org/licenses/by/4.0/)
- Hierarchy level
- Dataset
- Date
- Statement
- Creative Commons Attribution 4
- gmd:disseminationConstraints
- License
- Access constraints
- License
- Use constraints
- License
- Metadata language
- English
- Character set
- utf8 UTF8
- Topic category
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- Geoscientific information
- Begin date
- 2018-11-01T00:00:00
- End date
- 2018-11-01T12:00:00
- Distribution format
-