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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Wiley
2023
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ftarchimer:oai:archimer.ifremer.fr:88317 2023-05-15T15:11:00+02:00 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 2023-01 application/pdf https://archimer.ifremer.fr/doc/00771/88317/93950.pdf https://archimer.ifremer.fr/doc/00771/88317/93951.docx https://archimer.ifremer.fr/doc/00771/88317/93952.xlsx https://doi.org/10.1111/bor.12592 https://archimer.ifremer.fr/doc/00771/88317/ eng eng Wiley https://archimer.ifremer.fr/doc/00771/88317/93950.pdf https://archimer.ifremer.fr/doc/00771/88317/93951.docx https://archimer.ifremer.fr/doc/00771/88317/93952.xlsx doi:10.1111/bor.12592 https://archimer.ifremer.fr/doc/00771/88317/ info:eu-repo/semantics/openAccess restricted use Boreas (0300-9483) (Wiley), 2023-01 , Vol. 52 , N. 1 , P. 109-123 text Publication info:eu-repo/semantics/article 2023 ftarchimer https://doi.org/10.1111/bor.12592 2023-03-14T23:55:18Z 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 Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Arctic Norway Svalbard Boreas |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
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. |
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 |
2023 |
url |
https://archimer.ifremer.fr/doc/00771/88317/93950.pdf https://archimer.ifremer.fr/doc/00771/88317/93951.docx https://archimer.ifremer.fr/doc/00771/88317/93952.xlsx https://doi.org/10.1111/bor.12592 https://archimer.ifremer.fr/doc/00771/88317/ |
geographic |
Arctic Norway Svalbard |
geographic_facet |
Arctic Norway Svalbard |
genre |
Arctic Foraminifera* Sea ice Storfjorden Svalbard |
genre_facet |
Arctic Foraminifera* Sea ice Storfjorden Svalbard |
op_source |
Boreas (0300-9483) (Wiley), 2023-01 , Vol. 52 , N. 1 , P. 109-123 |
op_relation |
https://archimer.ifremer.fr/doc/00771/88317/93950.pdf https://archimer.ifremer.fr/doc/00771/88317/93951.docx https://archimer.ifremer.fr/doc/00771/88317/93952.xlsx doi:10.1111/bor.12592 https://archimer.ifremer.fr/doc/00771/88317/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1111/bor.12592 |
container_title |
Boreas |
_version_ |
1766341921132773376 |