An ice-sheet scale comparison of eskers with modelled subglacial drainage routes
Eskers record the signature of channelised meltwater drainage during deglaciation providing vital information on the nature and evolution of subglacial drainage. In this paper, we compare the spatial pattern of eskers beneath the former Laurentide Ice Sheet with subglacial drainage routes diagnosed...
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Elsevier
2015
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Online Access: | https://eprints.whiterose.ac.uk/87138/ https://eprints.whiterose.ac.uk/87138/7/WRRO_87138.pdf https://doi.org/10.1016/j.geomorph.2015.06.016 |
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ftleedsuniv:oai:eprints.whiterose.ac.uk:87138 2023-05-15T16:40:17+02:00 An ice-sheet scale comparison of eskers with modelled subglacial drainage routes Livingstone, S.J. Storrar, R.D. Hillier, J.K. Stokes, C.R. Clark, C.D. Tarasov, L. 2015-10 text https://eprints.whiterose.ac.uk/87138/ https://eprints.whiterose.ac.uk/87138/7/WRRO_87138.pdf https://doi.org/10.1016/j.geomorph.2015.06.016 en eng Elsevier https://eprints.whiterose.ac.uk/87138/7/WRRO_87138.pdf Livingstone, S.J., Storrar, R.D., Hillier, J.K. et al. (3 more authors) (2015) An ice-sheet scale comparison of eskers with modelled subglacial drainage routes. Geomorphology, 246. 104 - 112. ISSN 1872-695X Article PeerReviewed 2015 ftleedsuniv https://doi.org/10.1016/j.geomorph.2015.06.016 2023-01-30T21:33:26Z Eskers record the signature of channelised meltwater drainage during deglaciation providing vital information on the nature and evolution of subglacial drainage. In this paper, we compare the spatial pattern of eskers beneath the former Laurentide Ice Sheet with subglacial drainage routes diagnosed at discrete time intervals from the results of a numerical ice-sheet model. Perhaps surprisingly, we show that eskers predominantly occur in regions where modelled subglacial water flow is low. Eskers and modelled subglacial drainage routes were found to typically match over distances of < 10 km, and most eskers show a better agreement with the routes close to the ice margin just prior to deglaciation. This supports a time-transgressive esker pattern, with formation in short (< 10 km) segments of conduit close behind a retreating ice margin, and probably associated with thin, stagnant or sluggish ice. Esker-forming conduits were probably dominated by supraglacially fed meltwater inputs. We also show that modelled subglacial drainage routes containing the largest concentrations of meltwater show a close correlation with palaeo-ice stream locations. The paucity of eskers along the terrestrial portion of these palaeo-ice streams and meltwater routes is probably because of the prevalence of distributed drainage and the high erosion potential of fast-flowing ice. Article in Journal/Newspaper Ice Sheet White Rose Research Online (Universities of Leeds, Sheffield & York) Geomorphology 246 104 112 |
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Open Polar |
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White Rose Research Online (Universities of Leeds, Sheffield & York) |
op_collection_id |
ftleedsuniv |
language |
English |
description |
Eskers record the signature of channelised meltwater drainage during deglaciation providing vital information on the nature and evolution of subglacial drainage. In this paper, we compare the spatial pattern of eskers beneath the former Laurentide Ice Sheet with subglacial drainage routes diagnosed at discrete time intervals from the results of a numerical ice-sheet model. Perhaps surprisingly, we show that eskers predominantly occur in regions where modelled subglacial water flow is low. Eskers and modelled subglacial drainage routes were found to typically match over distances of < 10 km, and most eskers show a better agreement with the routes close to the ice margin just prior to deglaciation. This supports a time-transgressive esker pattern, with formation in short (< 10 km) segments of conduit close behind a retreating ice margin, and probably associated with thin, stagnant or sluggish ice. Esker-forming conduits were probably dominated by supraglacially fed meltwater inputs. We also show that modelled subglacial drainage routes containing the largest concentrations of meltwater show a close correlation with palaeo-ice stream locations. The paucity of eskers along the terrestrial portion of these palaeo-ice streams and meltwater routes is probably because of the prevalence of distributed drainage and the high erosion potential of fast-flowing ice. |
format |
Article in Journal/Newspaper |
author |
Livingstone, S.J. Storrar, R.D. Hillier, J.K. Stokes, C.R. Clark, C.D. Tarasov, L. |
spellingShingle |
Livingstone, S.J. Storrar, R.D. Hillier, J.K. Stokes, C.R. Clark, C.D. Tarasov, L. An ice-sheet scale comparison of eskers with modelled subglacial drainage routes |
author_facet |
Livingstone, S.J. Storrar, R.D. Hillier, J.K. Stokes, C.R. Clark, C.D. Tarasov, L. |
author_sort |
Livingstone, S.J. |
title |
An ice-sheet scale comparison of eskers with modelled subglacial drainage routes |
title_short |
An ice-sheet scale comparison of eskers with modelled subglacial drainage routes |
title_full |
An ice-sheet scale comparison of eskers with modelled subglacial drainage routes |
title_fullStr |
An ice-sheet scale comparison of eskers with modelled subglacial drainage routes |
title_full_unstemmed |
An ice-sheet scale comparison of eskers with modelled subglacial drainage routes |
title_sort |
ice-sheet scale comparison of eskers with modelled subglacial drainage routes |
publisher |
Elsevier |
publishDate |
2015 |
url |
https://eprints.whiterose.ac.uk/87138/ https://eprints.whiterose.ac.uk/87138/7/WRRO_87138.pdf https://doi.org/10.1016/j.geomorph.2015.06.016 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
https://eprints.whiterose.ac.uk/87138/7/WRRO_87138.pdf Livingstone, S.J., Storrar, R.D., Hillier, J.K. et al. (3 more authors) (2015) An ice-sheet scale comparison of eskers with modelled subglacial drainage routes. Geomorphology, 246. 104 - 112. ISSN 1872-695X |
op_doi |
https://doi.org/10.1016/j.geomorph.2015.06.016 |
container_title |
Geomorphology |
container_volume |
246 |
container_start_page |
104 |
op_container_end_page |
112 |
_version_ |
1766030672201252864 |