Christmann, Julia ; Helm, Veit ; Khan, Shfaqat Abbas ; Kleiner, Thomas ; Müller, Ralf ; Morlighem, Mathieu ; Neckel, Niklas ; Rückamp, Martin ; Steinhage, Daniel ; Zeising, Ole ; Humbert, Angelika (2021)
Elastic deformation plays a non-negligible role in Greenland’s outlet glacier flow.
In: Communications Earth & Environment, 2 (1)
doi: 10.1038/s43247-021-00296-3
Article, Bibliographie
Abstract
Abstract Future projections of global mean sea level change are uncertain, partly because of our limited understanding of the dynamics of Greenland’s outlet glaciers. Here we study Nioghalvfjerdsbræ, an outlet glacier of the Northeast Greenland Ice Stream that holds 1.1 m sea-level equivalent of ice. We use GPS observations and numerical modelling to investigate the role of tides as well as the elastic contribution to glacier flow. We find that ocean tides alter the basal lubrication of the glacier up to 10 km inland of the grounding line, and that their influence is best described by a viscoelastic rather than a viscous model. Further inland, sliding is the dominant mechanism of fast glacier motion, and the ice flow induces persistent elastic strain. We conclude that elastic deformation plays a role in glacier flow, particularly in areas of steep topographic changes and fast ice velocities.
| Item Type: | Article |
|---|---|
| Erschienen: | 2021 |
| Creators: | Christmann, Julia ; Helm, Veit ; Khan, Shfaqat Abbas ; Kleiner, Thomas ; Müller, Ralf ; Morlighem, Mathieu ; Neckel, Niklas ; Rückamp, Martin ; Steinhage, Daniel ; Zeising, Ole ; Humbert, Angelika |
| Type of entry: | Bibliographie |
| Title: | Elastic deformation plays a non-negligible role in Greenland’s outlet glacier flow |
| Language: | English |
| Date: | December 2021 |
| Journal or Publication Title: | Communications Earth & Environment |
| Volume of the journal: | 2 |
| Issue Number: | 1 |
| DOI: | 10.1038/s43247-021-00296-3 |
| URL / URN: | https://www.nature.com/articles/s43247-021-00296-3 |
| Abstract: | Abstract Future projections of global mean sea level change are uncertain, partly because of our limited understanding of the dynamics of Greenland’s outlet glaciers. Here we study Nioghalvfjerdsbræ, an outlet glacier of the Northeast Greenland Ice Stream that holds 1.1 m sea-level equivalent of ice. We use GPS observations and numerical modelling to investigate the role of tides as well as the elastic contribution to glacier flow. We find that ocean tides alter the basal lubrication of the glacier up to 10 km inland of the grounding line, and that their influence is best described by a viscoelastic rather than a viscous model. Further inland, sliding is the dominant mechanism of fast glacier motion, and the ice flow induces persistent elastic strain. We conclude that elastic deformation plays a role in glacier flow, particularly in areas of steep topographic changes and fast ice velocities. |
| Identification Number: | 232 |
| Divisions: | 13 Department of Civil and Environmental Engineering Sciences 13 Department of Civil and Environmental Engineering Sciences > Mechanics 13 Department of Civil and Environmental Engineering Sciences > Mechanics > Continuum Mechanics |
| Date Deposited: | 03 May 2022 06:25 |
| Last Modified: | 03 May 2022 06:25 |
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