Early taphonomy of benthic foraminifera in Storfjorden ‘sea‐ice factory’: the agglutinated/calcareous ratio as a proxy for brine persistence
The recurrent latent‐heat polynya characterizing Storfjorden (Svalbard, Norway) triggers seasonal formation of thin first‐year sea ice. This leads to the production of dense, salty, and corrosive brines that cascade towards the sea floor and mix with shelf waters. The bottom topography of the fjord...
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Online Access: | http://dx.doi.org/10.1111/bor.12592 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12592 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bor.12592 |
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crwiley:10.1111/bor.12592 2024-06-02T08:02:35+00:00 Early taphonomy of benthic foraminifera in Storfjorden ‘sea‐ice factory’: the agglutinated/calcareous ratio as a proxy for brine persistence Nardelli, Maria Pia Fossile, Eleonora Péron, Olivier Howa, Hélène Mojtahid, Meryem Universite Angers Conseil Régional des Pays de la Loire 2022 http://dx.doi.org/10.1111/bor.12592 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12592 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bor.12592 en eng Wiley http://creativecommons.org/licenses/by-nc-nd/4.0/ Boreas volume 52, issue 1, page 109-123 ISSN 0300-9483 1502-3885 journal-article 2022 crwiley https://doi.org/10.1111/bor.12592 2024-05-03T11:31:23Z The recurrent latent‐heat polynya characterizing Storfjorden (Svalbard, Norway) triggers seasonal formation of thin first‐year sea ice. This leads to the production of dense, salty, and corrosive brines that cascade towards the sea floor and mix with shelf waters. The bottom topography of the fjord is responsible for the retention of these dense waters in two central deep basins throughout the year. Recent studies show that living benthic foraminifera in Storfjorden are particularly affected by the persistence of brines on the sea floor, with a strong dominance of agglutinated (A) species and high degrees of dissolution of calcareous(C) faunas. Therefore, the A/C ratio, calculated on living faunas, was proposed as a proxy for brine persistence. In the present study we analyse the fossil faunas, found below the taphonomically active zone, to investigate the residual signal of the A/C proxy after the intense early taphonomic processes and challenge its applicability in sedimentary archives. Our results show that despite the generally high taphonomic loss inside the fjord, a high proportion of agglutinated species is still visible in fossil faunas at the stations experiencing regular and/or persistent presence of brine‐enriched shelf waters. These results support the application of the A/C ratio in historical records to reconstruct the persistence of brines and indirectly the first‐year sea ice formation in Storfjorden. This can be further applied to other Arctic fjords with similar settings and characterized by the production of brines during the winter–early spring season. Article in Journal/Newspaper Arctic Foraminifera* Sea ice Storfjorden Svalbard Wiley Online Library Arctic Svalbard Norway Boreas |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
The recurrent latent‐heat polynya characterizing Storfjorden (Svalbard, Norway) triggers seasonal formation of thin first‐year sea ice. This leads to the production of dense, salty, and corrosive brines that cascade towards the sea floor and mix with shelf waters. The bottom topography of the fjord is responsible for the retention of these dense waters in two central deep basins throughout the year. Recent studies show that living benthic foraminifera in Storfjorden are particularly affected by the persistence of brines on the sea floor, with a strong dominance of agglutinated (A) species and high degrees of dissolution of calcareous(C) faunas. Therefore, the A/C ratio, calculated on living faunas, was proposed as a proxy for brine persistence. In the present study we analyse the fossil faunas, found below the taphonomically active zone, to investigate the residual signal of the A/C proxy after the intense early taphonomic processes and challenge its applicability in sedimentary archives. Our results show that despite the generally high taphonomic loss inside the fjord, a high proportion of agglutinated species is still visible in fossil faunas at the stations experiencing regular and/or persistent presence of brine‐enriched shelf waters. These results support the application of the A/C ratio in historical records to reconstruct the persistence of brines and indirectly the first‐year sea ice formation in Storfjorden. This can be further applied to other Arctic fjords with similar settings and characterized by the production of brines during the winter–early spring season. |
author2 |
Universite Angers Conseil Régional des Pays de la Loire |
format |
Article in Journal/Newspaper |
author |
Nardelli, Maria Pia Fossile, Eleonora Péron, Olivier Howa, Hélène Mojtahid, Meryem |
spellingShingle |
Nardelli, Maria Pia Fossile, Eleonora Péron, Olivier Howa, Hélène Mojtahid, Meryem Early taphonomy of benthic foraminifera in Storfjorden ‘sea‐ice factory’: the agglutinated/calcareous ratio as a proxy for brine persistence |
author_facet |
Nardelli, Maria Pia Fossile, Eleonora Péron, Olivier Howa, Hélène Mojtahid, Meryem |
author_sort |
Nardelli, Maria Pia |
title |
Early taphonomy of benthic foraminifera in Storfjorden ‘sea‐ice factory’: the agglutinated/calcareous ratio as a proxy for brine persistence |
title_short |
Early taphonomy of benthic foraminifera in Storfjorden ‘sea‐ice factory’: the agglutinated/calcareous ratio as a proxy for brine persistence |
title_full |
Early taphonomy of benthic foraminifera in Storfjorden ‘sea‐ice factory’: the agglutinated/calcareous ratio as a proxy for brine persistence |
title_fullStr |
Early taphonomy of benthic foraminifera in Storfjorden ‘sea‐ice factory’: the agglutinated/calcareous ratio as a proxy for brine persistence |
title_full_unstemmed |
Early taphonomy of benthic foraminifera in Storfjorden ‘sea‐ice factory’: the agglutinated/calcareous ratio as a proxy for brine persistence |
title_sort |
early taphonomy of benthic foraminifera in storfjorden ‘sea‐ice factory’: the agglutinated/calcareous ratio as a proxy for brine persistence |
publisher |
Wiley |
publishDate |
2022 |
url |
http://dx.doi.org/10.1111/bor.12592 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12592 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bor.12592 |
geographic |
Arctic Svalbard Norway |
geographic_facet |
Arctic Svalbard Norway |
genre |
Arctic Foraminifera* Sea ice Storfjorden Svalbard |
genre_facet |
Arctic Foraminifera* Sea ice Storfjorden Svalbard |
op_source |
Boreas volume 52, issue 1, page 109-123 ISSN 0300-9483 1502-3885 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1111/bor.12592 |
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Boreas |
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1800747060672069632 |