Greenland ice stream dynamics: Short-lived and agile?
Reliable knowledge of ice discharge dynamics for the Greenland ice sheet via its ice streams is essential if we are to understand its stability under future climate scenarios as well as their dynamics in the past. Currently, active ice streams in Greenland have been well mapped using remote-sensing...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5016260 2023-10-29T02:36:38+01:00 Greenland ice stream dynamics: Short-lived and agile? Eisen, O. radar consortium, E. 2023 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016260 eng eng info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-0205 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016260 XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) info:eu-repo/semantics/conferenceObject 2023 ftgfzpotsdam https://doi.org/10.57757/IUGG23-0205 2023-10-01T23:43:19Z Reliable knowledge of ice discharge dynamics for the Greenland ice sheet via its ice streams is essential if we are to understand its stability under future climate scenarios as well as their dynamics in the past. Currently, active ice streams in Greenland have been well mapped using remote-sensing data while past ice-stream paths in what are now deglaciated regions can be reconstructed from the landforms they left behind. However, little is known about possible former and now defunct ice streams in areas still covered by ice. Here, we use radio-echo sounding data to decipher the regional ice-flow history of the northeastern Greenland ice sheet on the basis of its internal stratigraphy. Based on the same data set we also establish age-depth distributions in the ice stream and determine the physical properties of the ice, notably the distribution of anisotropy. By creating a three-dimensional reconstruction of time-equivalent horizons, we map folds deep below the surface that we then attribute to the deformation caused by now-extinct ice streams. We propose that locally this ancient ice-flow regime was much more focused and reached much farther inland than today’s and was deactivated when the main drainage system was reconfigured and relocated southwards. The insight that major ice streams in Greenland might start, shift or abruptly disappear will affect future approaches to understanding and modelling the response of Earth’s ice sheets to global warming. EGRIP radar consortium: Daniela Jansen, Steven Franke, Tobias Binder, Paul D. Bons, Dorthe Dahl-Jensen, Reinhard Drews, Graeme Eagles, Olaf Eisen, Reza Ershadi, Tamara Annina Gerber, Prasad Gogineni, Aslak Grinsted, Veit Helm, Angelika Humbert, Christine Hvidberg, David Lilien, Heinrich Miller, Charles O'Neill, John D. Paden, Nicholas Rathmann, Daniel Steinhage, Nicolas Stoll, Kyra Streng, Fernando Valero-Delgado, Ilka Weikusat, Julien Westhoff, Tun Jan Young, Ole Zeising Conference Object Greenland Ice Sheet GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
English |
description |
Reliable knowledge of ice discharge dynamics for the Greenland ice sheet via its ice streams is essential if we are to understand its stability under future climate scenarios as well as their dynamics in the past. Currently, active ice streams in Greenland have been well mapped using remote-sensing data while past ice-stream paths in what are now deglaciated regions can be reconstructed from the landforms they left behind. However, little is known about possible former and now defunct ice streams in areas still covered by ice. Here, we use radio-echo sounding data to decipher the regional ice-flow history of the northeastern Greenland ice sheet on the basis of its internal stratigraphy. Based on the same data set we also establish age-depth distributions in the ice stream and determine the physical properties of the ice, notably the distribution of anisotropy. By creating a three-dimensional reconstruction of time-equivalent horizons, we map folds deep below the surface that we then attribute to the deformation caused by now-extinct ice streams. We propose that locally this ancient ice-flow regime was much more focused and reached much farther inland than today’s and was deactivated when the main drainage system was reconfigured and relocated southwards. The insight that major ice streams in Greenland might start, shift or abruptly disappear will affect future approaches to understanding and modelling the response of Earth’s ice sheets to global warming. EGRIP radar consortium: Daniela Jansen, Steven Franke, Tobias Binder, Paul D. Bons, Dorthe Dahl-Jensen, Reinhard Drews, Graeme Eagles, Olaf Eisen, Reza Ershadi, Tamara Annina Gerber, Prasad Gogineni, Aslak Grinsted, Veit Helm, Angelika Humbert, Christine Hvidberg, David Lilien, Heinrich Miller, Charles O'Neill, John D. Paden, Nicholas Rathmann, Daniel Steinhage, Nicolas Stoll, Kyra Streng, Fernando Valero-Delgado, Ilka Weikusat, Julien Westhoff, Tun Jan Young, Ole Zeising |
format |
Conference Object |
author |
Eisen, O. radar consortium, E. |
spellingShingle |
Eisen, O. radar consortium, E. Greenland ice stream dynamics: Short-lived and agile? |
author_facet |
Eisen, O. radar consortium, E. |
author_sort |
Eisen, O. |
title |
Greenland ice stream dynamics: Short-lived and agile? |
title_short |
Greenland ice stream dynamics: Short-lived and agile? |
title_full |
Greenland ice stream dynamics: Short-lived and agile? |
title_fullStr |
Greenland ice stream dynamics: Short-lived and agile? |
title_full_unstemmed |
Greenland ice stream dynamics: Short-lived and agile? |
title_sort |
greenland ice stream dynamics: short-lived and agile? |
publishDate |
2023 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016260 |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-0205 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016260 |
op_doi |
https://doi.org/10.57757/IUGG23-0205 |
_version_ |
1781060697679986688 |