Late wisconsinan buildup and wastage of the innuitian Ice Sheet across southern Ellesmere Island, Nunavut
During the Late Wisconsinan, a precursor of the Prince of Wales Icefield, southern Ellesmere Island, formed a prodigious ice divide of the Innuitian Ice Sheet. Initial buildup occurred after 19 ka BP, when the icefield advanced west (inland) across Makinson Inlet from margins similar to present. Sub...
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ftuglasgow:oai:eprints.gla.ac.uk:11315 2024-06-02T08:03:49+00:00 Late wisconsinan buildup and wastage of the innuitian Ice Sheet across southern Ellesmere Island, Nunavut England, J. Atkinson, N. Dyke, A. Evans, D. Zreda, M. 2004 https://eprints.gla.ac.uk/11315/ unknown England, J., Atkinson, N., Dyke, A., Evans, D. and Zreda, M. (2004) Late wisconsinan buildup and wastage of the innuitian Ice Sheet across southern Ellesmere Island, Nunavut. Canadian Journal of Earth Sciences <https://eprints.gla.ac.uk/view/journal_volume/Canadian_Journal_of_Earth_Sciences.html>, 41, pp. 39-61. (doi:10.1139/E03-082 <https://doi.org/10.1139/E03-082>) Articles PeerReviewed 2004 ftuglasgow https://doi.org/10.1139/E03-082 2024-05-06T15:08:16Z During the Late Wisconsinan, a precursor of the Prince of Wales Icefield, southern Ellesmere Island, formed a prodigious ice divide of the Innuitian Ice Sheet. Initial buildup occurred after 19 ka BP, when the icefield advanced west (inland) across Makinson Inlet from margins similar to present. Subsequent reversal of flow to the east required ice divide migration to the west onto a plateau that is largely ice-free today. From this divide, a trunk glacier flowed eastward through Makinson Inlet to join the Smith Sound Ice Stream en route to nothern Baffin Bay. Westward flow from this divide filled Baumann Fiord, depositing a granite dispersal train that extends a further 600 km across the archipelago to the polar continental shelf. Deglaciation of most of Makinson Inlet occurred catastrophically at ~9.3 ka BP, forming a calving bay that thinned the Innuitian divide, thereby triggering deglaciation of most of Baumann Fiord by 8.5 ka BP. Ninety 14C dates on Holocene shells and driftwood constrain deglacial isochrones and postglacial emergence curves on opposite sides of the former Innuitian divide. Isobases drawn on the 8 ka BP shoreline rise northwest towards Eureka Sound, the axis of maximum former ice thickness. Ice margins on Ellesmere Island were similar to present from ~50�19 ka BP (spanning marine isotope stages 3 and 2). However, significant regional variation in ice extent during this interval is recorded by ice rafting from the Laurentide Ice Sheet into Baffin Bay. Later buildup of the Innuitian Ice Sheet occurred during the low global sea level that defines the last glacial maximum (18 ka BP). We also suggest that the Innuitian Ice Sheet was influenced by the buttressing and subsequent removal of the Greenland Ice Sheet along eastern Ellesmere Island. Article in Journal/Newspaper Baffin Bay Baffin Bay Baffin Baumann Fiord Ellesmere Island Eureka Eureka Sound glacier Greenland Ice Sheet Nunavut Smith sound University of Glasgow: Enlighten - Publications Baffin Bay Baumann Fiord ENVELOPE(-85.583,-85.583,77.668,77.668) Ellesmere Island Eureka ENVELOPE(-85.940,-85.940,79.990,79.990) Eureka Sound ENVELOPE(-84.999,-84.999,79.002,79.002) Greenland Makinson Inlet ENVELOPE(-79.665,-79.665,77.268,77.268) Nunavut Prince of Wales Icefield ENVELOPE(-78.998,-78.998,78.252,78.252) Smith Sound ENVELOPE(-73.996,-73.996,78.419,78.419) Canadian Journal of Earth Sciences 41 1 39 61 |
institution |
Open Polar |
collection |
University of Glasgow: Enlighten - Publications |
op_collection_id |
ftuglasgow |
language |
unknown |
description |
During the Late Wisconsinan, a precursor of the Prince of Wales Icefield, southern Ellesmere Island, formed a prodigious ice divide of the Innuitian Ice Sheet. Initial buildup occurred after 19 ka BP, when the icefield advanced west (inland) across Makinson Inlet from margins similar to present. Subsequent reversal of flow to the east required ice divide migration to the west onto a plateau that is largely ice-free today. From this divide, a trunk glacier flowed eastward through Makinson Inlet to join the Smith Sound Ice Stream en route to nothern Baffin Bay. Westward flow from this divide filled Baumann Fiord, depositing a granite dispersal train that extends a further 600 km across the archipelago to the polar continental shelf. Deglaciation of most of Makinson Inlet occurred catastrophically at ~9.3 ka BP, forming a calving bay that thinned the Innuitian divide, thereby triggering deglaciation of most of Baumann Fiord by 8.5 ka BP. Ninety 14C dates on Holocene shells and driftwood constrain deglacial isochrones and postglacial emergence curves on opposite sides of the former Innuitian divide. Isobases drawn on the 8 ka BP shoreline rise northwest towards Eureka Sound, the axis of maximum former ice thickness. Ice margins on Ellesmere Island were similar to present from ~50�19 ka BP (spanning marine isotope stages 3 and 2). However, significant regional variation in ice extent during this interval is recorded by ice rafting from the Laurentide Ice Sheet into Baffin Bay. Later buildup of the Innuitian Ice Sheet occurred during the low global sea level that defines the last glacial maximum (18 ka BP). We also suggest that the Innuitian Ice Sheet was influenced by the buttressing and subsequent removal of the Greenland Ice Sheet along eastern Ellesmere Island. |
format |
Article in Journal/Newspaper |
author |
England, J. Atkinson, N. Dyke, A. Evans, D. Zreda, M. |
spellingShingle |
England, J. Atkinson, N. Dyke, A. Evans, D. Zreda, M. Late wisconsinan buildup and wastage of the innuitian Ice Sheet across southern Ellesmere Island, Nunavut |
author_facet |
England, J. Atkinson, N. Dyke, A. Evans, D. Zreda, M. |
author_sort |
England, J. |
title |
Late wisconsinan buildup and wastage of the innuitian Ice Sheet across southern Ellesmere Island, Nunavut |
title_short |
Late wisconsinan buildup and wastage of the innuitian Ice Sheet across southern Ellesmere Island, Nunavut |
title_full |
Late wisconsinan buildup and wastage of the innuitian Ice Sheet across southern Ellesmere Island, Nunavut |
title_fullStr |
Late wisconsinan buildup and wastage of the innuitian Ice Sheet across southern Ellesmere Island, Nunavut |
title_full_unstemmed |
Late wisconsinan buildup and wastage of the innuitian Ice Sheet across southern Ellesmere Island, Nunavut |
title_sort |
late wisconsinan buildup and wastage of the innuitian ice sheet across southern ellesmere island, nunavut |
publishDate |
2004 |
url |
https://eprints.gla.ac.uk/11315/ |
long_lat |
ENVELOPE(-85.583,-85.583,77.668,77.668) ENVELOPE(-85.940,-85.940,79.990,79.990) ENVELOPE(-84.999,-84.999,79.002,79.002) ENVELOPE(-79.665,-79.665,77.268,77.268) ENVELOPE(-78.998,-78.998,78.252,78.252) ENVELOPE(-73.996,-73.996,78.419,78.419) |
geographic |
Baffin Bay Baumann Fiord Ellesmere Island Eureka Eureka Sound Greenland Makinson Inlet Nunavut Prince of Wales Icefield Smith Sound |
geographic_facet |
Baffin Bay Baumann Fiord Ellesmere Island Eureka Eureka Sound Greenland Makinson Inlet Nunavut Prince of Wales Icefield Smith Sound |
genre |
Baffin Bay Baffin Bay Baffin Baumann Fiord Ellesmere Island Eureka Eureka Sound glacier Greenland Ice Sheet Nunavut Smith sound |
genre_facet |
Baffin Bay Baffin Bay Baffin Baumann Fiord Ellesmere Island Eureka Eureka Sound glacier Greenland Ice Sheet Nunavut Smith sound |
op_relation |
England, J., Atkinson, N., Dyke, A., Evans, D. and Zreda, M. (2004) Late wisconsinan buildup and wastage of the innuitian Ice Sheet across southern Ellesmere Island, Nunavut. Canadian Journal of Earth Sciences <https://eprints.gla.ac.uk/view/journal_volume/Canadian_Journal_of_Earth_Sciences.html>, 41, pp. 39-61. (doi:10.1139/E03-082 <https://doi.org/10.1139/E03-082>) |
op_doi |
https://doi.org/10.1139/E03-082 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
41 |
container_issue |
1 |
container_start_page |
39 |
op_container_end_page |
61 |
_version_ |
1800748427663900672 |