GNSS Data collected at Priestley Glacier November 2018

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 R...

Full description

Bibliographic Details
Main Authors: Drews, Reinhard, Wild, Christian T, Marsh, Oliver, Rack, Wolfgang, Ehlers, Todd A, Neckel, Niklas, Helm, Veit
Format: Other/Unknown Material
Language:English
Published: PANGAEA 2021
Subjects:
Antarctica
ERA-PLANET
GNSS
GPS
Grounding Line
The European network for observing our changing planet
Antarc*
Ice Shelf
Ice Shelves
Priestley Glacier
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.936090
https://doi.org/10.1594/PANGAEA.936090
Description
Summary: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.

Similar Items