Converging flow and anisotropy cause large-scale folding in Greenland's ice sheet
The increasing catalogue of high-quality ice-penetrating radar data provides a unique insight in the internal layering architecture of the Greenland ice sheet. The stratigraphy, an indicator of past deformation, highlights irregularities in ice flow and reveals large perturbations without obvious li...
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ftleibnizopen:oai:oai.leibnizopen.de:ZfwjF4cBdbrxVwz60a4Q 2023-05-15T16:21:06+02:00 Converging flow and anisotropy cause large-scale folding in Greenland's ice sheet Bons, Paul D. Jansen, Daniela Mundel, Felicitas Bauer, Catherine C. Binder, Tobias Eisen, Olaf Jessell, Mark W. Llorens, Maria-Gema Steinbach, Florian Steinhage, Daniel Weikusat, Ilka 2016 https://repository.publisso.de/resource/frl:6408448 https://doi.org/10.1038/ncomms11427 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4855532/ https://www.nature.com/articles/ncomms11427#supplementary-information eng eng CC BY 4.0 Nature Communications, 7:11427 2016 ftleibnizopen https://doi.org/10.1038/ncomms11427 2023-03-26T23:08:29Z The increasing catalogue of high-quality ice-penetrating radar data provides a unique insight in the internal layering architecture of the Greenland ice sheet. The stratigraphy, an indicator of past deformation, highlights irregularities in ice flow and reveals large perturbations without obvious links to bedrock shape. In this work, to establish a new conceptual model for the formation process, we analysed the radar data at the onset of the Petermann Glacier, North Greenland, and created a three-dimensional model of several distinct stratigraphic layers. We demonstrate that the dominant structures are cylindrical folds sub-parallel to the ice flow. By numerical modelling, we show that these folds can be formed by lateral compression of mechanically anisotropic ice, while a general viscosity contrast between layers would not lead to folding for the same boundary conditions. We conclude that the folds primarily form by converging flow as the mechanically anisotropic ice is channelled towards the glacier. Other/Unknown Material glacier Greenland Ice Sheet North Greenland Petermann glacier LeibnizOpen (The Leibniz Association) Greenland Nature Communications 7 1 |
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Open Polar |
collection |
LeibnizOpen (The Leibniz Association) |
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ftleibnizopen |
language |
English |
description |
The increasing catalogue of high-quality ice-penetrating radar data provides a unique insight in the internal layering architecture of the Greenland ice sheet. The stratigraphy, an indicator of past deformation, highlights irregularities in ice flow and reveals large perturbations without obvious links to bedrock shape. In this work, to establish a new conceptual model for the formation process, we analysed the radar data at the onset of the Petermann Glacier, North Greenland, and created a three-dimensional model of several distinct stratigraphic layers. We demonstrate that the dominant structures are cylindrical folds sub-parallel to the ice flow. By numerical modelling, we show that these folds can be formed by lateral compression of mechanically anisotropic ice, while a general viscosity contrast between layers would not lead to folding for the same boundary conditions. We conclude that the folds primarily form by converging flow as the mechanically anisotropic ice is channelled towards the glacier. |
author |
Bons, Paul D. Jansen, Daniela Mundel, Felicitas Bauer, Catherine C. Binder, Tobias Eisen, Olaf Jessell, Mark W. Llorens, Maria-Gema Steinbach, Florian Steinhage, Daniel Weikusat, Ilka |
spellingShingle |
Bons, Paul D. Jansen, Daniela Mundel, Felicitas Bauer, Catherine C. Binder, Tobias Eisen, Olaf Jessell, Mark W. Llorens, Maria-Gema Steinbach, Florian Steinhage, Daniel Weikusat, Ilka Converging flow and anisotropy cause large-scale folding in Greenland's ice sheet |
author_facet |
Bons, Paul D. Jansen, Daniela Mundel, Felicitas Bauer, Catherine C. Binder, Tobias Eisen, Olaf Jessell, Mark W. Llorens, Maria-Gema Steinbach, Florian Steinhage, Daniel Weikusat, Ilka |
author_sort |
Bons, Paul D. |
title |
Converging flow and anisotropy cause large-scale folding in Greenland's ice sheet |
title_short |
Converging flow and anisotropy cause large-scale folding in Greenland's ice sheet |
title_full |
Converging flow and anisotropy cause large-scale folding in Greenland's ice sheet |
title_fullStr |
Converging flow and anisotropy cause large-scale folding in Greenland's ice sheet |
title_full_unstemmed |
Converging flow and anisotropy cause large-scale folding in Greenland's ice sheet |
title_sort |
converging flow and anisotropy cause large-scale folding in greenland's ice sheet |
publishDate |
2016 |
url |
https://repository.publisso.de/resource/frl:6408448 https://doi.org/10.1038/ncomms11427 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4855532/ https://www.nature.com/articles/ncomms11427#supplementary-information |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland Ice Sheet North Greenland Petermann glacier |
genre_facet |
glacier Greenland Ice Sheet North Greenland Petermann glacier |
op_source |
Nature Communications, 7:11427 |
op_rights |
CC BY 4.0 |
op_doi |
https://doi.org/10.1038/ncomms11427 |
container_title |
Nature Communications |
container_volume |
7 |
container_issue |
1 |
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1766009114331185152 |