Ventilation History of the Nordic Seas Deduced From Pelagic‐Benthic Radiocarbon Age Offsets
Abstract Changes in ocean circulation are considered a major driver of centennial‐to‐millennial scale climate variability during the last deglaciation. Using four sediment records from the Nordic Seas, we studied radiocarbon ventilation ages in subsurface and bottom waters to reconstruct past variat...
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ftdoajarticles:oai:doaj.org/article:8fcbae0003c84fbc8332912ab1c9eada 2023-12-03T10:23:27+01:00 Ventilation History of the Nordic Seas Deduced From Pelagic‐Benthic Radiocarbon Age Offsets Maciej M. Telesiński Mohamed M. Ezat Francesco Muschitiello Henning A. Bauch Robert F. Spielhagen 2021-04-01T00:00:00Z https://doi.org/10.1029/2020GC009132 https://doaj.org/article/8fcbae0003c84fbc8332912ab1c9eada EN eng Wiley https://doi.org/10.1029/2020GC009132 https://doaj.org/toc/1525-2027 1525-2027 doi:10.1029/2020GC009132 https://doaj.org/article/8fcbae0003c84fbc8332912ab1c9eada Geochemistry, Geophysics, Geosystems, Vol 22, Iss 4, Pp n/a-n/a (2021) Deglaciation foraminifera Nordic Seas ocean circulation radiocarbon ventilation Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 article 2021 ftdoajarticles https://doi.org/10.1029/2020GC009132 2023-11-05T01:35:59Z Abstract Changes in ocean circulation are considered a major driver of centennial‐to‐millennial scale climate variability during the last deglaciation. Using four sediment records from the Nordic Seas, we studied radiocarbon ventilation ages in subsurface and bottom waters to reconstruct past variations in watermass overturning. Planktic foraminiferal ages show significant spatial variability over most of the studied period. These differences suggest that the ventilation of the shallower subsurface waters is strongly influenced by local conditions such as sea‐ice and meltwater input, changes in mixed‐layer depth, and/or variable contributions of water masses with different 14C signatures. Despite covering a significant water depth range, the benthic foraminiferal records show common long‐term patterns, with generally weaker ventilation during stadials and stronger during interstadials. The Greenland Sea record differs the most from the other records, which can be explained by the greater depth and the geographical distance of this site. The benthic records reflect regional shifts in deep convection and suggest that the deep Nordic Seas have been generally bathed by a single, though changing, deep‐water mass analogous to the present‐day Greenland Sea Deep Water. Since significant offsets in ventilation ages are yielded by different taxonomic or ecological groups of benthic foraminifera, the use of uniform material seems a prerequisite to reconstruct bottom water ventilation histories. Article in Journal/Newspaper Greenland Greenland Sea Nordic Seas Sea ice Directory of Open Access Journals: DOAJ Articles Greenland Geochemistry, Geophysics, Geosystems 22 4 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Deglaciation foraminifera Nordic Seas ocean circulation radiocarbon ventilation Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 |
spellingShingle |
Deglaciation foraminifera Nordic Seas ocean circulation radiocarbon ventilation Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 Maciej M. Telesiński Mohamed M. Ezat Francesco Muschitiello Henning A. Bauch Robert F. Spielhagen Ventilation History of the Nordic Seas Deduced From Pelagic‐Benthic Radiocarbon Age Offsets |
topic_facet |
Deglaciation foraminifera Nordic Seas ocean circulation radiocarbon ventilation Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 |
description |
Abstract Changes in ocean circulation are considered a major driver of centennial‐to‐millennial scale climate variability during the last deglaciation. Using four sediment records from the Nordic Seas, we studied radiocarbon ventilation ages in subsurface and bottom waters to reconstruct past variations in watermass overturning. Planktic foraminiferal ages show significant spatial variability over most of the studied period. These differences suggest that the ventilation of the shallower subsurface waters is strongly influenced by local conditions such as sea‐ice and meltwater input, changes in mixed‐layer depth, and/or variable contributions of water masses with different 14C signatures. Despite covering a significant water depth range, the benthic foraminiferal records show common long‐term patterns, with generally weaker ventilation during stadials and stronger during interstadials. The Greenland Sea record differs the most from the other records, which can be explained by the greater depth and the geographical distance of this site. The benthic records reflect regional shifts in deep convection and suggest that the deep Nordic Seas have been generally bathed by a single, though changing, deep‐water mass analogous to the present‐day Greenland Sea Deep Water. Since significant offsets in ventilation ages are yielded by different taxonomic or ecological groups of benthic foraminifera, the use of uniform material seems a prerequisite to reconstruct bottom water ventilation histories. |
format |
Article in Journal/Newspaper |
author |
Maciej M. Telesiński Mohamed M. Ezat Francesco Muschitiello Henning A. Bauch Robert F. Spielhagen |
author_facet |
Maciej M. Telesiński Mohamed M. Ezat Francesco Muschitiello Henning A. Bauch Robert F. Spielhagen |
author_sort |
Maciej M. Telesiński |
title |
Ventilation History of the Nordic Seas Deduced From Pelagic‐Benthic Radiocarbon Age Offsets |
title_short |
Ventilation History of the Nordic Seas Deduced From Pelagic‐Benthic Radiocarbon Age Offsets |
title_full |
Ventilation History of the Nordic Seas Deduced From Pelagic‐Benthic Radiocarbon Age Offsets |
title_fullStr |
Ventilation History of the Nordic Seas Deduced From Pelagic‐Benthic Radiocarbon Age Offsets |
title_full_unstemmed |
Ventilation History of the Nordic Seas Deduced From Pelagic‐Benthic Radiocarbon Age Offsets |
title_sort |
ventilation history of the nordic seas deduced from pelagic‐benthic radiocarbon age offsets |
publisher |
Wiley |
publishDate |
2021 |
url |
https://doi.org/10.1029/2020GC009132 https://doaj.org/article/8fcbae0003c84fbc8332912ab1c9eada |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland Sea Nordic Seas Sea ice |
genre_facet |
Greenland Greenland Sea Nordic Seas Sea ice |
op_source |
Geochemistry, Geophysics, Geosystems, Vol 22, Iss 4, Pp n/a-n/a (2021) |
op_relation |
https://doi.org/10.1029/2020GC009132 https://doaj.org/toc/1525-2027 1525-2027 doi:10.1029/2020GC009132 https://doaj.org/article/8fcbae0003c84fbc8332912ab1c9eada |
op_doi |
https://doi.org/10.1029/2020GC009132 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
22 |
container_issue |
4 |
_version_ |
1784271604307460096 |