Basal processes beneath an Arctic glacier and their geomorphic imprint after a surge, Elisebreen, Svalbard
The foreground of Elisebreen, a retreating valley glacier in West Svalbard, exhibits a well-preserved assemblage of subglacial landforms including ice-flow parallel ridges (flutings), ice-flow oblique ridges (crevasse-fill features), and meandering ridges (infill of basal meltwater conduits). Other...
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Language: | English |
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2005
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ftuniaarhuspubl:oai:pure.atira.dk:publications/b31f92c6-a9b2-4286-ad74-800d1e9cd110 2023-12-31T10:01:52+01:00 Basal processes beneath an Arctic glacier and their geomorphic imprint after a surge, Elisebreen, Svalbard Christoffersen, Poul Piotrowski, Jan A. Larsen, Nicolaj K. 2005-09-01 https://pure.au.dk/portal/da/publications/basal-processes-beneath-an-arctic-glacier-and-their-geomorphic-imprint-after-a-surge-elisebreen-svalbard(b31f92c6-a9b2-4286-ad74-800d1e9cd110).html https://doi.org/10.1016/j.yqres.2005.05.009 http://www.scopus.com/inward/record.url?scp=24144481790&partnerID=8YFLogxK eng eng https://pure.au.dk/portal/da/publications/basal-processes-beneath-an-arctic-glacier-and-their-geomorphic-imprint-after-a-surge-elisebreen-svalbard(b31f92c6-a9b2-4286-ad74-800d1e9cd110).html info:eu-repo/semantics/restrictedAccess Christoffersen , P , Piotrowski , J A & Larsen , N K 2005 , ' Basal processes beneath an Arctic glacier and their geomorphic imprint after a surge, Elisebreen, Svalbard ' , Quaternary Research , vol. 64 , no. 2 , pp. 125-137 . https://doi.org/10.1016/j.yqres.2005.05.009 Flutings Landforms Subglacial processes Surge Svalbard Till article 2005 ftuniaarhuspubl https://doi.org/10.1016/j.yqres.2005.05.009 2023-12-07T00:03:55Z The foreground of Elisebreen, a retreating valley glacier in West Svalbard, exhibits a well-preserved assemblage of subglacial landforms including ice-flow parallel ridges (flutings), ice-flow oblique ridges (crevasse-fill features), and meandering ridges (infill of basal meltwater conduits). Other landforms are thrust-block moraine, hummocky terrain, and drumlinoid hills. We argue in agreement with geomorphological models that this landform assemblage was generated by ice-flow instability, possibly a surge, which took place in the past when the ice was thicker and the bed warmer. The surge likely occurred due to elevated pore-water pressure in a thin layer of thawed and water-saturated till that separated glacier ice from a frozen substratum. Termination may have been caused by a combination of water drainage and loss of lubricating sediment. Sedimentological investigations indicate that key landforms may be formed by weak till oozing into basal cavities and crevasses, opening in response to accelerated ice flow, and into water conduits abandoned during rearrangement of the basal water system. Today, Elisebreen may no longer have surge potential due to its diminished size. The ability to identify ice-flow instability from geomorphological criteria is important in deglaciated terrain as well as in regions where ice dynamics are adapting to climate change. Article in Journal/Newspaper Arctic Arctic Climate change glacier Svalbard Aarhus University: Research Quaternary Research 64 2 125 137 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
Flutings Landforms Subglacial processes Surge Svalbard Till |
spellingShingle |
Flutings Landforms Subglacial processes Surge Svalbard Till Christoffersen, Poul Piotrowski, Jan A. Larsen, Nicolaj K. Basal processes beneath an Arctic glacier and their geomorphic imprint after a surge, Elisebreen, Svalbard |
topic_facet |
Flutings Landforms Subglacial processes Surge Svalbard Till |
description |
The foreground of Elisebreen, a retreating valley glacier in West Svalbard, exhibits a well-preserved assemblage of subglacial landforms including ice-flow parallel ridges (flutings), ice-flow oblique ridges (crevasse-fill features), and meandering ridges (infill of basal meltwater conduits). Other landforms are thrust-block moraine, hummocky terrain, and drumlinoid hills. We argue in agreement with geomorphological models that this landform assemblage was generated by ice-flow instability, possibly a surge, which took place in the past when the ice was thicker and the bed warmer. The surge likely occurred due to elevated pore-water pressure in a thin layer of thawed and water-saturated till that separated glacier ice from a frozen substratum. Termination may have been caused by a combination of water drainage and loss of lubricating sediment. Sedimentological investigations indicate that key landforms may be formed by weak till oozing into basal cavities and crevasses, opening in response to accelerated ice flow, and into water conduits abandoned during rearrangement of the basal water system. Today, Elisebreen may no longer have surge potential due to its diminished size. The ability to identify ice-flow instability from geomorphological criteria is important in deglaciated terrain as well as in regions where ice dynamics are adapting to climate change. |
format |
Article in Journal/Newspaper |
author |
Christoffersen, Poul Piotrowski, Jan A. Larsen, Nicolaj K. |
author_facet |
Christoffersen, Poul Piotrowski, Jan A. Larsen, Nicolaj K. |
author_sort |
Christoffersen, Poul |
title |
Basal processes beneath an Arctic glacier and their geomorphic imprint after a surge, Elisebreen, Svalbard |
title_short |
Basal processes beneath an Arctic glacier and their geomorphic imprint after a surge, Elisebreen, Svalbard |
title_full |
Basal processes beneath an Arctic glacier and their geomorphic imprint after a surge, Elisebreen, Svalbard |
title_fullStr |
Basal processes beneath an Arctic glacier and their geomorphic imprint after a surge, Elisebreen, Svalbard |
title_full_unstemmed |
Basal processes beneath an Arctic glacier and their geomorphic imprint after a surge, Elisebreen, Svalbard |
title_sort |
basal processes beneath an arctic glacier and their geomorphic imprint after a surge, elisebreen, svalbard |
publishDate |
2005 |
url |
https://pure.au.dk/portal/da/publications/basal-processes-beneath-an-arctic-glacier-and-their-geomorphic-imprint-after-a-surge-elisebreen-svalbard(b31f92c6-a9b2-4286-ad74-800d1e9cd110).html https://doi.org/10.1016/j.yqres.2005.05.009 http://www.scopus.com/inward/record.url?scp=24144481790&partnerID=8YFLogxK |
genre |
Arctic Arctic Climate change glacier Svalbard |
genre_facet |
Arctic Arctic Climate change glacier Svalbard |
op_source |
Christoffersen , P , Piotrowski , J A & Larsen , N K 2005 , ' Basal processes beneath an Arctic glacier and their geomorphic imprint after a surge, Elisebreen, Svalbard ' , Quaternary Research , vol. 64 , no. 2 , pp. 125-137 . https://doi.org/10.1016/j.yqres.2005.05.009 |
op_relation |
https://pure.au.dk/portal/da/publications/basal-processes-beneath-an-arctic-glacier-and-their-geomorphic-imprint-after-a-surge-elisebreen-svalbard(b31f92c6-a9b2-4286-ad74-800d1e9cd110).html |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.yqres.2005.05.009 |
container_title |
Quaternary Research |
container_volume |
64 |
container_issue |
2 |
container_start_page |
125 |
op_container_end_page |
137 |
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1786807498033856512 |