Pliocene–Pleistocene megafloods as a mechanism for Greenlandic megacanyon formation
The Greenland ice sheet (GrIS) covers a complex network of canyons thought to be preglacial and fluvial in origin, implying that these features have influenced the ice sheet since its inception. The largest of these canyons terminates in northwest Greenland at the outlet of the Petermann Glacier. Ye...
Published in: | Geology |
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Online Access: | https://curis.ku.dk/portal/da/publications/pliocenepleistocene-megafloods-as-a-mechanism-for-greenlandic-megacanyon-formation(c33be04e-f304-4c9e-a0ac-db8847dab834).html https://doi.org/10.1130/G47253.1 |
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ftcopenhagenunip:oai:pure.atira.dk:publications/c33be04e-f304-4c9e-a0ac-db8847dab834 2024-04-28T08:19:52+00:00 Pliocene–Pleistocene megafloods as a mechanism for Greenlandic megacanyon formation Keisling, B.A. Nielsen, Lisbeth Tangaa Hvidberg, Christine Schøtt Nuterman, Roman DeConto, Robert M. 2020-04-29 https://curis.ku.dk/portal/da/publications/pliocenepleistocene-megafloods-as-a-mechanism-for-greenlandic-megacanyon-formation(c33be04e-f304-4c9e-a0ac-db8847dab834).html https://doi.org/10.1130/G47253.1 eng eng info:eu-repo/semantics/closedAccess Keisling , B A , Nielsen , L T , Hvidberg , C S , Nuterman , R & DeConto , R M 2020 , ' Pliocene–Pleistocene megafloods as a mechanism for Greenlandic megacanyon formation ' , Geology , vol. 48 , no. 7 , pp. 737-741 . https://doi.org/10.1130/G47253.1 article 2020 ftcopenhagenunip https://doi.org/10.1130/G47253.1 2024-04-11T00:22:40Z The Greenland ice sheet (GrIS) covers a complex network of canyons thought to be preglacial and fluvial in origin, implying that these features have influenced the ice sheet since its inception. The largest of these canyons terminates in northwest Greenland at the outlet of the Petermann Glacier. Yet, the genesis of this canyon, and similar features in northern Greenland, remains unknown. Here, we present numerical model simulations of early GrIS history and show that interactions among climate, the growing ice sheet, and preexisting topography may have contributed to the excavation of the canyon via repeated catastrophic outburst floods. Our results have implications for interpreting sedimentary and geomorphic features beneath the GrIS and around its marine margins, and they document a novel mechanism for landscape erosion in Greenland. Article in Journal/Newspaper glacier Greenland greenlandic Ice Sheet Petermann glacier University of Copenhagen: Research Geology 48 7 737 741 |
institution |
Open Polar |
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University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
description |
The Greenland ice sheet (GrIS) covers a complex network of canyons thought to be preglacial and fluvial in origin, implying that these features have influenced the ice sheet since its inception. The largest of these canyons terminates in northwest Greenland at the outlet of the Petermann Glacier. Yet, the genesis of this canyon, and similar features in northern Greenland, remains unknown. Here, we present numerical model simulations of early GrIS history and show that interactions among climate, the growing ice sheet, and preexisting topography may have contributed to the excavation of the canyon via repeated catastrophic outburst floods. Our results have implications for interpreting sedimentary and geomorphic features beneath the GrIS and around its marine margins, and they document a novel mechanism for landscape erosion in Greenland. |
format |
Article in Journal/Newspaper |
author |
Keisling, B.A. Nielsen, Lisbeth Tangaa Hvidberg, Christine Schøtt Nuterman, Roman DeConto, Robert M. |
spellingShingle |
Keisling, B.A. Nielsen, Lisbeth Tangaa Hvidberg, Christine Schøtt Nuterman, Roman DeConto, Robert M. Pliocene–Pleistocene megafloods as a mechanism for Greenlandic megacanyon formation |
author_facet |
Keisling, B.A. Nielsen, Lisbeth Tangaa Hvidberg, Christine Schøtt Nuterman, Roman DeConto, Robert M. |
author_sort |
Keisling, B.A. |
title |
Pliocene–Pleistocene megafloods as a mechanism for Greenlandic megacanyon formation |
title_short |
Pliocene–Pleistocene megafloods as a mechanism for Greenlandic megacanyon formation |
title_full |
Pliocene–Pleistocene megafloods as a mechanism for Greenlandic megacanyon formation |
title_fullStr |
Pliocene–Pleistocene megafloods as a mechanism for Greenlandic megacanyon formation |
title_full_unstemmed |
Pliocene–Pleistocene megafloods as a mechanism for Greenlandic megacanyon formation |
title_sort |
pliocene–pleistocene megafloods as a mechanism for greenlandic megacanyon formation |
publishDate |
2020 |
url |
https://curis.ku.dk/portal/da/publications/pliocenepleistocene-megafloods-as-a-mechanism-for-greenlandic-megacanyon-formation(c33be04e-f304-4c9e-a0ac-db8847dab834).html https://doi.org/10.1130/G47253.1 |
genre |
glacier Greenland greenlandic Ice Sheet Petermann glacier |
genre_facet |
glacier Greenland greenlandic Ice Sheet Petermann glacier |
op_source |
Keisling , B A , Nielsen , L T , Hvidberg , C S , Nuterman , R & DeConto , R M 2020 , ' Pliocene–Pleistocene megafloods as a mechanism for Greenlandic megacanyon formation ' , Geology , vol. 48 , no. 7 , pp. 737-741 . https://doi.org/10.1130/G47253.1 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1130/G47253.1 |
container_title |
Geology |
container_volume |
48 |
container_issue |
7 |
container_start_page |
737 |
op_container_end_page |
741 |
_version_ |
1797583118513733632 |