The Holocene History of Nares Strait: Transition from Glacial Bay to Arctic-Atlantic Throughflow
Retreat of glacier ice from Nares Strait and other straits in the Canadian Arctic Archipelago after the end of the last Ice Age initiated an important connection between the Arctic and the North Atlantic Oceans, allowing development of modern ocean circulation in Baffin Bay and the Labrador Sea. As...
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ftdoajarticles:oai:doaj.org/article:5921125a23cf4614a7cfa023d540c3b0 2023-05-15T14:28:56+02:00 The Holocene History of Nares Strait: Transition from Glacial Bay to Arctic-Atlantic Throughflow Anne E. Jennings Christina Sheldon Thomas M. Cronin Pierre Francus Joseph Stoner John Andrews 2011-06-01T00:00:00Z https://doaj.org/article/5921125a23cf4614a7cfa023d540c3b0 EN eng The Oceanography Society http://tos.org/oceanography/archive/24-3_jennings.pdf https://doaj.org/toc/1042-8275 1042-8275 https://doaj.org/article/5921125a23cf4614a7cfa023d540c3b0 Oceanography, Vol 24, Iss 3, Pp 26-41 (2011) Arctic Ocean International Polar Year IPY Nares Strait Oceanography GC1-1581 article 2011 ftdoajarticles 2022-12-31T03:38:00Z Retreat of glacier ice from Nares Strait and other straits in the Canadian Arctic Archipelago after the end of the last Ice Age initiated an important connection between the Arctic and the North Atlantic Oceans, allowing development of modern ocean circulation in Baffin Bay and the Labrador Sea. As low-salinity, nutrient-rich Arctic Water began to enter Baffin Bay, it contributed to the Baffin and Labrador currents flowing southward. This enhanced freshwater inflow must have influenced the sea ice regime and likely is responsible for poor calcium carbonate preservation that characterizes the Baffin Island margin today. Sedimentologic and paleoceanographic data from radiocarbon-dated core HLY03-05GC, Hall Basin, northern Nares Strait, document the timing and paleoenvironments surrounding the retreat of waning ice sheets from Nares Strait and opening of this connection between the Arctic Ocean and Baffin Bay. Hall Basin was deglaciated soon before 10,300 cal BP (calibrated years before present) and records ice-distal sedimentation in a glacial bay facing the Arctic Ocean until about 9,000 cal BP. Atlantic Water was present in Hall Basin during deglaciation, suggesting that it may have promoted ice retreat. A transitional unit with high ice-rafted debris content records the opening of Nares Strait at approximately 9,000 cal BP. High productivity in Hall Basin between 9,000 and 6,000 cal BP reflects reduced sea ice cover and duration as well as throughflow of nutrient-rich Pacific Water. The later Holocene is poorly resolved in the core, but slow sedimentation rates and heavier carbon isotope values support an interpretation of increased sea ice cover and decreased productivity during the Neoglacial period. Article in Journal/Newspaper Arctic Archipelago Arctic Arctic Ocean Baffin Bay Baffin Bay Baffin Island Baffin Canadian Arctic Archipelago Hall Basin International Polar Year IPY Labrador Sea Nares strait North Atlantic Sea ice Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean Baffin Bay Baffin Island Canadian Arctic Archipelago Hall Basin ENVELOPE(-62.992,-62.992,81.502,81.502) Nares ENVELOPE(158.167,158.167,-81.450,-81.450) Pacific |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Arctic Ocean International Polar Year IPY Nares Strait Oceanography GC1-1581 |
spellingShingle |
Arctic Ocean International Polar Year IPY Nares Strait Oceanography GC1-1581 Anne E. Jennings Christina Sheldon Thomas M. Cronin Pierre Francus Joseph Stoner John Andrews The Holocene History of Nares Strait: Transition from Glacial Bay to Arctic-Atlantic Throughflow |
topic_facet |
Arctic Ocean International Polar Year IPY Nares Strait Oceanography GC1-1581 |
description |
Retreat of glacier ice from Nares Strait and other straits in the Canadian Arctic Archipelago after the end of the last Ice Age initiated an important connection between the Arctic and the North Atlantic Oceans, allowing development of modern ocean circulation in Baffin Bay and the Labrador Sea. As low-salinity, nutrient-rich Arctic Water began to enter Baffin Bay, it contributed to the Baffin and Labrador currents flowing southward. This enhanced freshwater inflow must have influenced the sea ice regime and likely is responsible for poor calcium carbonate preservation that characterizes the Baffin Island margin today. Sedimentologic and paleoceanographic data from radiocarbon-dated core HLY03-05GC, Hall Basin, northern Nares Strait, document the timing and paleoenvironments surrounding the retreat of waning ice sheets from Nares Strait and opening of this connection between the Arctic Ocean and Baffin Bay. Hall Basin was deglaciated soon before 10,300 cal BP (calibrated years before present) and records ice-distal sedimentation in a glacial bay facing the Arctic Ocean until about 9,000 cal BP. Atlantic Water was present in Hall Basin during deglaciation, suggesting that it may have promoted ice retreat. A transitional unit with high ice-rafted debris content records the opening of Nares Strait at approximately 9,000 cal BP. High productivity in Hall Basin between 9,000 and 6,000 cal BP reflects reduced sea ice cover and duration as well as throughflow of nutrient-rich Pacific Water. The later Holocene is poorly resolved in the core, but slow sedimentation rates and heavier carbon isotope values support an interpretation of increased sea ice cover and decreased productivity during the Neoglacial period. |
format |
Article in Journal/Newspaper |
author |
Anne E. Jennings Christina Sheldon Thomas M. Cronin Pierre Francus Joseph Stoner John Andrews |
author_facet |
Anne E. Jennings Christina Sheldon Thomas M. Cronin Pierre Francus Joseph Stoner John Andrews |
author_sort |
Anne E. Jennings |
title |
The Holocene History of Nares Strait: Transition from Glacial Bay to Arctic-Atlantic Throughflow |
title_short |
The Holocene History of Nares Strait: Transition from Glacial Bay to Arctic-Atlantic Throughflow |
title_full |
The Holocene History of Nares Strait: Transition from Glacial Bay to Arctic-Atlantic Throughflow |
title_fullStr |
The Holocene History of Nares Strait: Transition from Glacial Bay to Arctic-Atlantic Throughflow |
title_full_unstemmed |
The Holocene History of Nares Strait: Transition from Glacial Bay to Arctic-Atlantic Throughflow |
title_sort |
holocene history of nares strait: transition from glacial bay to arctic-atlantic throughflow |
publisher |
The Oceanography Society |
publishDate |
2011 |
url |
https://doaj.org/article/5921125a23cf4614a7cfa023d540c3b0 |
long_lat |
ENVELOPE(-62.992,-62.992,81.502,81.502) ENVELOPE(158.167,158.167,-81.450,-81.450) |
geographic |
Arctic Arctic Ocean Baffin Bay Baffin Island Canadian Arctic Archipelago Hall Basin Nares Pacific |
geographic_facet |
Arctic Arctic Ocean Baffin Bay Baffin Island Canadian Arctic Archipelago Hall Basin Nares Pacific |
genre |
Arctic Archipelago Arctic Arctic Ocean Baffin Bay Baffin Bay Baffin Island Baffin Canadian Arctic Archipelago Hall Basin International Polar Year IPY Labrador Sea Nares strait North Atlantic Sea ice |
genre_facet |
Arctic Archipelago Arctic Arctic Ocean Baffin Bay Baffin Bay Baffin Island Baffin Canadian Arctic Archipelago Hall Basin International Polar Year IPY Labrador Sea Nares strait North Atlantic Sea ice |
op_source |
Oceanography, Vol 24, Iss 3, Pp 26-41 (2011) |
op_relation |
http://tos.org/oceanography/archive/24-3_jennings.pdf https://doaj.org/toc/1042-8275 1042-8275 https://doaj.org/article/5921125a23cf4614a7cfa023d540c3b0 |
_version_ |
1766303062165553152 |