Local and regional controls on Holocene sea ice dynamics and oceanography in Nares Strait, Northwest Greenland
International audience Nares Strait is one of three channels that connect the Arctic Ocean to Baffin Bay. Unique sea-ice conditions in the strait lead to the formation of landfast ice arches at its northern and southern ends. These ice arches regulate Arctic sea-ice and freshwater export through the...
Published in: | Marine Geology |
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Main Authors: | , , , , , , |
Other Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2020
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Subjects: | |
Online Access: | https://hal.science/hal-02991666 https://hal.science/hal-02991666/document https://hal.science/hal-02991666/file/Georgiadis-et-al_2020-1.pdf https://doi.org/10.1016/j.margeo.2020.106115 |
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ftinsu:oai:HAL:hal-02991666v1 |
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openpolar |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Arctic Ocean and adjacent high latitudes Paleoceanography Micropaleontology (forams) Glacial sediments Sea-ice biomarkers [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] |
spellingShingle |
Arctic Ocean and adjacent high latitudes Paleoceanography Micropaleontology (forams) Glacial sediments Sea-ice biomarkers [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] Georgiadis, Eleanor Giraudeau, Jacques Jennings, Anne Limoges, Audrey Jackson, Rebecca Ribeiro, Sofia Massé, Guillaume Local and regional controls on Holocene sea ice dynamics and oceanography in Nares Strait, Northwest Greenland |
topic_facet |
Arctic Ocean and adjacent high latitudes Paleoceanography Micropaleontology (forams) Glacial sediments Sea-ice biomarkers [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] |
description |
International audience Nares Strait is one of three channels that connect the Arctic Ocean to Baffin Bay. Unique sea-ice conditions in the strait lead to the formation of landfast ice arches at its northern and southern ends. These ice arches regulate Arctic sea-ice and freshwater export through the strait and promote the opening of the North Water polynya. The present study addresses the paucity of pre-satellite records of environmental conditions in the Nares Strait area, and aims at reconstructing Holocene sea-ice conditions and ocean circulation in the strait. The investigation is based on a marine sediment core strategically retrieved from under the current ice arch in Kane Basin to the south of Nares Strait, and provides a continuous record spanning the past ca 9 kyrs. We use benthic foraminiferal assemblages and sea-ice biomarkers to infer changes in Holocene ocean circulation and sea-ice conditions in Kane Basin. The establishment of the modern ocean circulation in Kane Basin is related to ice sheet retreat and postglacial rebound, while changes in sea-ice cover concur with major shifts in the Arctic Oscillation (AO). Our results suggest that sea-ice cover in Kane Basin was highly variable between ca 9.0 and 8.3 cal. ka BP, before increasing, probably in link with the 8.2 cold event and the opening of Nares Strait. A short period of minimum sea-ice cover and maximum Atlantic bottom water influence occurred between ca 8.1 and 7.5 cal. ka BP, when Kane Basin was deeper than for the remaining of the Holocene. As atmospheric temperatures dropped, sea-ice cover intensified in Kane Basin between ca 7.5 and 5.5 cal. ka BP, but strong winds under prevailing positive-like AO conditions likely prevented the formation of ice arches in Nares Strait. During this time, our micro-paleontological data show that Atlantic water was progressively excluded from Kane Basin by the postglacial isostatic rebound. Increasingly cooler atmospheric temperatures and a shift towards more negative phases of the AO may have promoted ... |
author2 |
Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) Institute of Arctic Alpine Research University of Colorado Boulder (INSTAAR) University of Colorado Boulder University of New Brunswick (UNB) Geological Survey of Denmark and Greenland (GEUS) Takuvik International Research Laboratory Université Laval Québec (ULaval)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Georgiadis, Eleanor Giraudeau, Jacques Jennings, Anne Limoges, Audrey Jackson, Rebecca Ribeiro, Sofia Massé, Guillaume |
author_facet |
Georgiadis, Eleanor Giraudeau, Jacques Jennings, Anne Limoges, Audrey Jackson, Rebecca Ribeiro, Sofia Massé, Guillaume |
author_sort |
Georgiadis, Eleanor |
title |
Local and regional controls on Holocene sea ice dynamics and oceanography in Nares Strait, Northwest Greenland |
title_short |
Local and regional controls on Holocene sea ice dynamics and oceanography in Nares Strait, Northwest Greenland |
title_full |
Local and regional controls on Holocene sea ice dynamics and oceanography in Nares Strait, Northwest Greenland |
title_fullStr |
Local and regional controls on Holocene sea ice dynamics and oceanography in Nares Strait, Northwest Greenland |
title_full_unstemmed |
Local and regional controls on Holocene sea ice dynamics and oceanography in Nares Strait, Northwest Greenland |
title_sort |
local and regional controls on holocene sea ice dynamics and oceanography in nares strait, northwest greenland |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-02991666 https://hal.science/hal-02991666/document https://hal.science/hal-02991666/file/Georgiadis-et-al_2020-1.pdf https://doi.org/10.1016/j.margeo.2020.106115 |
long_lat |
ENVELOPE(-63.038,-63.038,-73.952,-73.952) ENVELOPE(158.167,158.167,-81.450,-81.450) |
geographic |
Arctic Arctic Ocean Baffin Bay Greenland Kane Nares |
geographic_facet |
Arctic Arctic Ocean Baffin Bay Greenland Kane Nares |
genre |
Arctic Arctic Ocean Baffin Bay Baffin Bay Baffin Foraminifera* Greenland Ice Sheet Kane Basin Nares strait Sea ice |
genre_facet |
Arctic Arctic Ocean Baffin Bay Baffin Bay Baffin Foraminifera* Greenland Ice Sheet Kane Basin Nares strait Sea ice |
op_source |
ISSN: 0025-3227 Marine Geology https://hal.science/hal-02991666 Marine Geology, 2020, 422, pp.106115. ⟨10.1016/j.margeo.2020.106115⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.margeo.2020.106115 hal-02991666 https://hal.science/hal-02991666 https://hal.science/hal-02991666/document https://hal.science/hal-02991666/file/Georgiadis-et-al_2020-1.pdf doi:10.1016/j.margeo.2020.106115 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.margeo.2020.106115 |
container_title |
Marine Geology |
container_volume |
422 |
container_start_page |
106115 |
_version_ |
1769003971580526592 |
spelling |
ftinsu:oai:HAL:hal-02991666v1 2023-06-18T03:39:10+02:00 Local and regional controls on Holocene sea ice dynamics and oceanography in Nares Strait, Northwest Greenland Georgiadis, Eleanor Giraudeau, Jacques Jennings, Anne Limoges, Audrey Jackson, Rebecca Ribeiro, Sofia Massé, Guillaume Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) Institute of Arctic Alpine Research University of Colorado Boulder (INSTAAR) University of Colorado Boulder University of New Brunswick (UNB) Geological Survey of Denmark and Greenland (GEUS) Takuvik International Research Laboratory Université Laval Québec (ULaval)-Centre National de la Recherche Scientifique (CNRS) 2020 https://hal.science/hal-02991666 https://hal.science/hal-02991666/document https://hal.science/hal-02991666/file/Georgiadis-et-al_2020-1.pdf https://doi.org/10.1016/j.margeo.2020.106115 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.margeo.2020.106115 hal-02991666 https://hal.science/hal-02991666 https://hal.science/hal-02991666/document https://hal.science/hal-02991666/file/Georgiadis-et-al_2020-1.pdf doi:10.1016/j.margeo.2020.106115 info:eu-repo/semantics/OpenAccess ISSN: 0025-3227 Marine Geology https://hal.science/hal-02991666 Marine Geology, 2020, 422, pp.106115. ⟨10.1016/j.margeo.2020.106115⟩ Arctic Ocean and adjacent high latitudes Paleoceanography Micropaleontology (forams) Glacial sediments Sea-ice biomarkers [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2020 ftinsu https://doi.org/10.1016/j.margeo.2020.106115 2023-06-05T22:29:15Z International audience Nares Strait is one of three channels that connect the Arctic Ocean to Baffin Bay. Unique sea-ice conditions in the strait lead to the formation of landfast ice arches at its northern and southern ends. These ice arches regulate Arctic sea-ice and freshwater export through the strait and promote the opening of the North Water polynya. The present study addresses the paucity of pre-satellite records of environmental conditions in the Nares Strait area, and aims at reconstructing Holocene sea-ice conditions and ocean circulation in the strait. The investigation is based on a marine sediment core strategically retrieved from under the current ice arch in Kane Basin to the south of Nares Strait, and provides a continuous record spanning the past ca 9 kyrs. We use benthic foraminiferal assemblages and sea-ice biomarkers to infer changes in Holocene ocean circulation and sea-ice conditions in Kane Basin. The establishment of the modern ocean circulation in Kane Basin is related to ice sheet retreat and postglacial rebound, while changes in sea-ice cover concur with major shifts in the Arctic Oscillation (AO). Our results suggest that sea-ice cover in Kane Basin was highly variable between ca 9.0 and 8.3 cal. ka BP, before increasing, probably in link with the 8.2 cold event and the opening of Nares Strait. A short period of minimum sea-ice cover and maximum Atlantic bottom water influence occurred between ca 8.1 and 7.5 cal. ka BP, when Kane Basin was deeper than for the remaining of the Holocene. As atmospheric temperatures dropped, sea-ice cover intensified in Kane Basin between ca 7.5 and 5.5 cal. ka BP, but strong winds under prevailing positive-like AO conditions likely prevented the formation of ice arches in Nares Strait. During this time, our micro-paleontological data show that Atlantic water was progressively excluded from Kane Basin by the postglacial isostatic rebound. Increasingly cooler atmospheric temperatures and a shift towards more negative phases of the AO may have promoted ... Article in Journal/Newspaper Arctic Arctic Ocean Baffin Bay Baffin Bay Baffin Foraminifera* Greenland Ice Sheet Kane Basin Nares strait Sea ice Institut national des sciences de l'Univers: HAL-INSU Arctic Arctic Ocean Baffin Bay Greenland Kane ENVELOPE(-63.038,-63.038,-73.952,-73.952) Nares ENVELOPE(158.167,158.167,-81.450,-81.450) Marine Geology 422 106115 |