Landscape evolution under the southern Laurentide Ice Sheet
Subglacial landscapes, revealed in regions of recent ice-sheet retreat, provide a window into ice-sheet dynamics and interactions with evolving subglacial topography. Here, we document landscape evolution beneath the southern Laurentide Ice Sheet of North America since the end of the Pliocene, 2.6 m...
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ftpubmed:oai:pubmedcentral.nih.gov:8612676 2023-05-15T16:39:35+02:00 Landscape evolution under the southern Laurentide Ice Sheet Naylor, Shawn Wickert, Andrew D. Edmonds, Douglas A. Yanites, Brian J. 2021-11-24 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8612676/ http://www.ncbi.nlm.nih.gov/pubmed/34818050 https://doi.org/10.1126/sciadv.abj2938 en eng American Association for the Advancement of Science http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8612676/ http://www.ncbi.nlm.nih.gov/pubmed/34818050 http://dx.doi.org/10.1126/sciadv.abj2938 Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. CC-BY Sci Adv Earth Environmental Ecological and Space Sciences Text 2021 ftpubmed https://doi.org/10.1126/sciadv.abj2938 2021-12-12T01:27:37Z Subglacial landscapes, revealed in regions of recent ice-sheet retreat, provide a window into ice-sheet dynamics and interactions with evolving subglacial topography. Here, we document landscape evolution beneath the southern Laurentide Ice Sheet of North America since the end of the Pliocene, 2.6 million years (Ma) ago, by reconstructing the isostatically adjusted preglacial surface and modern bedrock topography at 250 m horizontal resolution. We use flow routing to reconstruct drainage networks and river longitudinal profiles, revealing the pattern and extent of their glacially forced reorganization. The overall mean Quaternary (2.6 Ma ago to present) erosion rate is 27 m/Ma, rising within ice-streaming corridors to 35 m/Ma (and locally reaching 400 m/Ma) and falling to 22 m/Ma in non–ice-streaming regions. Our results suggest that subglacial erosion was sufficient to lower the southern Laurentide Ice Sheet into warmer environments, thereby enhancing ablation and reducing ice-sheet extent over time. Text Ice Sheet PubMed Central (PMC) Science Advances 7 48 |
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English |
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Earth Environmental Ecological and Space Sciences |
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Earth Environmental Ecological and Space Sciences Naylor, Shawn Wickert, Andrew D. Edmonds, Douglas A. Yanites, Brian J. Landscape evolution under the southern Laurentide Ice Sheet |
topic_facet |
Earth Environmental Ecological and Space Sciences |
description |
Subglacial landscapes, revealed in regions of recent ice-sheet retreat, provide a window into ice-sheet dynamics and interactions with evolving subglacial topography. Here, we document landscape evolution beneath the southern Laurentide Ice Sheet of North America since the end of the Pliocene, 2.6 million years (Ma) ago, by reconstructing the isostatically adjusted preglacial surface and modern bedrock topography at 250 m horizontal resolution. We use flow routing to reconstruct drainage networks and river longitudinal profiles, revealing the pattern and extent of their glacially forced reorganization. The overall mean Quaternary (2.6 Ma ago to present) erosion rate is 27 m/Ma, rising within ice-streaming corridors to 35 m/Ma (and locally reaching 400 m/Ma) and falling to 22 m/Ma in non–ice-streaming regions. Our results suggest that subglacial erosion was sufficient to lower the southern Laurentide Ice Sheet into warmer environments, thereby enhancing ablation and reducing ice-sheet extent over time. |
format |
Text |
author |
Naylor, Shawn Wickert, Andrew D. Edmonds, Douglas A. Yanites, Brian J. |
author_facet |
Naylor, Shawn Wickert, Andrew D. Edmonds, Douglas A. Yanites, Brian J. |
author_sort |
Naylor, Shawn |
title |
Landscape evolution under the southern Laurentide Ice Sheet |
title_short |
Landscape evolution under the southern Laurentide Ice Sheet |
title_full |
Landscape evolution under the southern Laurentide Ice Sheet |
title_fullStr |
Landscape evolution under the southern Laurentide Ice Sheet |
title_full_unstemmed |
Landscape evolution under the southern Laurentide Ice Sheet |
title_sort |
landscape evolution under the southern laurentide ice sheet |
publisher |
American Association for the Advancement of Science |
publishDate |
2021 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8612676/ http://www.ncbi.nlm.nih.gov/pubmed/34818050 https://doi.org/10.1126/sciadv.abj2938 |
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Ice Sheet |
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Ice Sheet |
op_source |
Sci Adv |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8612676/ http://www.ncbi.nlm.nih.gov/pubmed/34818050 http://dx.doi.org/10.1126/sciadv.abj2938 |
op_rights |
Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
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CC-BY |
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https://doi.org/10.1126/sciadv.abj2938 |
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Science Advances |
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7 |
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48 |
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