Seafloor evidence for ice shelf flow across the Alaska–Beaufort margin of the Arctic Ocean
Abstract New imagery of ∼14 100 km 2 of seafloor along a 640 km stretch of the Alaska and Beaufort margins (ABM) in water depths from 250 to 2800 m depicts a repetitive association of glaciogenic bedforms (lineations and iceberg scours), broad erosional bathymetric features and adjacent downslope tu...
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crwiley:10.1002/esp.1601 2024-09-30T14:27:24+00:00 Seafloor evidence for ice shelf flow across the Alaska–Beaufort margin of the Arctic Ocean Engels, Jennifer L. Edwards, Margo H. Polyak, Leonid Johnson, Paul D. 2007 http://dx.doi.org/10.1002/esp.1601 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fesp.1601 https://onlinelibrary.wiley.com/doi/pdf/10.1002/esp.1601 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Earth Surface Processes and Landforms volume 33, issue 7, page 1047-1063 ISSN 0197-9337 1096-9837 journal-article 2007 crwiley https://doi.org/10.1002/esp.1601 2024-09-17T04:46:29Z Abstract New imagery of ∼14 100 km 2 of seafloor along a 640 km stretch of the Alaska and Beaufort margins (ABM) in water depths from 250 to 2800 m depicts a repetitive association of glaciogenic bedforms (lineations and iceberg scours), broad erosional bathymetric features and adjacent downslope turbidite gullies. These bedforms have styles, depths and orientations similar to features discovered earlier on the Chukchi Borderland, up to 800 km northwest of the ABM. Lineations occur across the surface of a flattened bathymetric bench interpreted to have formed by an ice shelf sliding along the continental slope and scraping the seafloor at temporary grounding locations. The glacial geology of surrounding areas suggests that an ice shelf probably flowed from the mouths of overdeepened glacial troughs in the Canadian Arctic Archipelago westward along the ABM and across the Chukchi Borderland. This curved pathway indicates an obstruction to ice flow in the central Canada Basin, possibly caused by either a basin‐wide ice shelf or by a pile‐up of mega‐bergs originating from the Eurasian side of the Arctic Ocean. The ice shelf that affected the ABM may have formed between Oxygen Isotopic Stage 4 to 5b, possibly correlating to an inferred intra‐Stage 5 widespread Beringian glaciation. Evidence for glaciogenic features on the ABM corroborates suggestions that large ice volumes and extents existed in the Arctic during Pleistocene glacial periods. These findings have far‐reaching implications for Arctic climate studies, ocean circulation, sediment stratigraphy and the stability of circum‐Arctic continental ice masses. Copyright © 2007 John Wiley & Sons, Ltd. Article in Journal/Newspaper Archipelago Arctic Archipelago Arctic Arctic Ocean canada basin Canadian Arctic Archipelago Chukchi Ice Shelf Iceberg* Alaska Wiley Online Library Arctic Arctic Ocean Canadian Arctic Archipelago Canada Chukchi Borderland ENVELOPE(-165.000,-165.000,77.000,77.000) Earth Surface Processes and Landforms 33 7 1047 1063 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract New imagery of ∼14 100 km 2 of seafloor along a 640 km stretch of the Alaska and Beaufort margins (ABM) in water depths from 250 to 2800 m depicts a repetitive association of glaciogenic bedforms (lineations and iceberg scours), broad erosional bathymetric features and adjacent downslope turbidite gullies. These bedforms have styles, depths and orientations similar to features discovered earlier on the Chukchi Borderland, up to 800 km northwest of the ABM. Lineations occur across the surface of a flattened bathymetric bench interpreted to have formed by an ice shelf sliding along the continental slope and scraping the seafloor at temporary grounding locations. The glacial geology of surrounding areas suggests that an ice shelf probably flowed from the mouths of overdeepened glacial troughs in the Canadian Arctic Archipelago westward along the ABM and across the Chukchi Borderland. This curved pathway indicates an obstruction to ice flow in the central Canada Basin, possibly caused by either a basin‐wide ice shelf or by a pile‐up of mega‐bergs originating from the Eurasian side of the Arctic Ocean. The ice shelf that affected the ABM may have formed between Oxygen Isotopic Stage 4 to 5b, possibly correlating to an inferred intra‐Stage 5 widespread Beringian glaciation. Evidence for glaciogenic features on the ABM corroborates suggestions that large ice volumes and extents existed in the Arctic during Pleistocene glacial periods. These findings have far‐reaching implications for Arctic climate studies, ocean circulation, sediment stratigraphy and the stability of circum‐Arctic continental ice masses. Copyright © 2007 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Engels, Jennifer L. Edwards, Margo H. Polyak, Leonid Johnson, Paul D. |
spellingShingle |
Engels, Jennifer L. Edwards, Margo H. Polyak, Leonid Johnson, Paul D. Seafloor evidence for ice shelf flow across the Alaska–Beaufort margin of the Arctic Ocean |
author_facet |
Engels, Jennifer L. Edwards, Margo H. Polyak, Leonid Johnson, Paul D. |
author_sort |
Engels, Jennifer L. |
title |
Seafloor evidence for ice shelf flow across the Alaska–Beaufort margin of the Arctic Ocean |
title_short |
Seafloor evidence for ice shelf flow across the Alaska–Beaufort margin of the Arctic Ocean |
title_full |
Seafloor evidence for ice shelf flow across the Alaska–Beaufort margin of the Arctic Ocean |
title_fullStr |
Seafloor evidence for ice shelf flow across the Alaska–Beaufort margin of the Arctic Ocean |
title_full_unstemmed |
Seafloor evidence for ice shelf flow across the Alaska–Beaufort margin of the Arctic Ocean |
title_sort |
seafloor evidence for ice shelf flow across the alaska–beaufort margin of the arctic ocean |
publisher |
Wiley |
publishDate |
2007 |
url |
http://dx.doi.org/10.1002/esp.1601 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fesp.1601 https://onlinelibrary.wiley.com/doi/pdf/10.1002/esp.1601 |
long_lat |
ENVELOPE(-165.000,-165.000,77.000,77.000) |
geographic |
Arctic Arctic Ocean Canadian Arctic Archipelago Canada Chukchi Borderland |
geographic_facet |
Arctic Arctic Ocean Canadian Arctic Archipelago Canada Chukchi Borderland |
genre |
Archipelago Arctic Archipelago Arctic Arctic Ocean canada basin Canadian Arctic Archipelago Chukchi Ice Shelf Iceberg* Alaska |
genre_facet |
Archipelago Arctic Archipelago Arctic Arctic Ocean canada basin Canadian Arctic Archipelago Chukchi Ice Shelf Iceberg* Alaska |
op_source |
Earth Surface Processes and Landforms volume 33, issue 7, page 1047-1063 ISSN 0197-9337 1096-9837 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/esp.1601 |
container_title |
Earth Surface Processes and Landforms |
container_volume |
33 |
container_issue |
7 |
container_start_page |
1047 |
op_container_end_page |
1063 |
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1811633489783554048 |