The nature of deep overturning and reconfigurations of the silicon cycle across the last deglaciation
Changes in ocean circulation and the biological carbon pump have been implicated as the drivers behind the rise in atmospheric CO2 across the last deglaciation; however, the processes involved remain uncertain. Previous records have hinted at a partitioning of deep ocean ventilation across the two m...
Published in: | Nature Communications |
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2020
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ftarchimer:oai:archimer.ifremer.fr:72971 2023-05-15T13:47:36+02:00 The nature of deep overturning and reconfigurations of the silicon cycle across the last deglaciation Dumont, M. Pichevin, L. Geibert, W. Crosta, X. Michel, E. Moreton, S. Dobby, K. Ganeshram, R. 2020-03 application/pdf https://archimer.ifremer.fr/doc/00618/72971/72036.pdf https://archimer.ifremer.fr/doc/00618/72971/72037.pdf https://archimer.ifremer.fr/doc/00618/72971/72038.pdf https://doi.org/10.1038/s41467-020-15101-6 https://archimer.ifremer.fr/doc/00618/72971/ eng eng Springer Science and Business Media LLC https://archimer.ifremer.fr/doc/00618/72971/72036.pdf https://archimer.ifremer.fr/doc/00618/72971/72037.pdf https://archimer.ifremer.fr/doc/00618/72971/72038.pdf doi:10.1038/s41467-020-15101-6 https://archimer.ifremer.fr/doc/00618/72971/ info:eu-repo/semantics/openAccess restricted use Nature Communications (2041-1723) (Springer Science and Business Media LLC), 2020-03 , Vol. 11 , N. 1 , P. 1534 (11p.) text Publication info:eu-repo/semantics/article 2020 ftarchimer https://doi.org/10.1038/s41467-020-15101-6 2021-09-23T20:34:50Z Changes in ocean circulation and the biological carbon pump have been implicated as the drivers behind the rise in atmospheric CO2 across the last deglaciation; however, the processes involved remain uncertain. Previous records have hinted at a partitioning of deep ocean ventilation across the two major intervals of atmospheric CO2 rise, but the consequences of differential ventilation on the Si cycle has not been explored. Here we present three new records of silicon isotopes in diatoms and sponges from the Southern Ocean that together show increased Si supply from deep mixing during the deglaciation with a maximum during the Younger Dryas (YD). We suggest Antarctic sea ice and Atlantic overturning conditions favoured abyssal ocean ventilation at the YD and marked an interval of Si cycle reorganisation. By regulating the strength of the biological pump, the glacial–interglacial shift in the Si cycle may present an important control on Pleistocene CO2 concentrations. Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic Southern Ocean Nature Communications 11 1 |
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 |
Changes in ocean circulation and the biological carbon pump have been implicated as the drivers behind the rise in atmospheric CO2 across the last deglaciation; however, the processes involved remain uncertain. Previous records have hinted at a partitioning of deep ocean ventilation across the two major intervals of atmospheric CO2 rise, but the consequences of differential ventilation on the Si cycle has not been explored. Here we present three new records of silicon isotopes in diatoms and sponges from the Southern Ocean that together show increased Si supply from deep mixing during the deglaciation with a maximum during the Younger Dryas (YD). We suggest Antarctic sea ice and Atlantic overturning conditions favoured abyssal ocean ventilation at the YD and marked an interval of Si cycle reorganisation. By regulating the strength of the biological pump, the glacial–interglacial shift in the Si cycle may present an important control on Pleistocene CO2 concentrations. |
format |
Article in Journal/Newspaper |
author |
Dumont, M. Pichevin, L. Geibert, W. Crosta, X. Michel, E. Moreton, S. Dobby, K. Ganeshram, R. |
spellingShingle |
Dumont, M. Pichevin, L. Geibert, W. Crosta, X. Michel, E. Moreton, S. Dobby, K. Ganeshram, R. The nature of deep overturning and reconfigurations of the silicon cycle across the last deglaciation |
author_facet |
Dumont, M. Pichevin, L. Geibert, W. Crosta, X. Michel, E. Moreton, S. Dobby, K. Ganeshram, R. |
author_sort |
Dumont, M. |
title |
The nature of deep overturning and reconfigurations of the silicon cycle across the last deglaciation |
title_short |
The nature of deep overturning and reconfigurations of the silicon cycle across the last deglaciation |
title_full |
The nature of deep overturning and reconfigurations of the silicon cycle across the last deglaciation |
title_fullStr |
The nature of deep overturning and reconfigurations of the silicon cycle across the last deglaciation |
title_full_unstemmed |
The nature of deep overturning and reconfigurations of the silicon cycle across the last deglaciation |
title_sort |
nature of deep overturning and reconfigurations of the silicon cycle across the last deglaciation |
publisher |
Springer Science and Business Media LLC |
publishDate |
2020 |
url |
https://archimer.ifremer.fr/doc/00618/72971/72036.pdf https://archimer.ifremer.fr/doc/00618/72971/72037.pdf https://archimer.ifremer.fr/doc/00618/72971/72038.pdf https://doi.org/10.1038/s41467-020-15101-6 https://archimer.ifremer.fr/doc/00618/72971/ |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean |
op_source |
Nature Communications (2041-1723) (Springer Science and Business Media LLC), 2020-03 , Vol. 11 , N. 1 , P. 1534 (11p.) |
op_relation |
https://archimer.ifremer.fr/doc/00618/72971/72036.pdf https://archimer.ifremer.fr/doc/00618/72971/72037.pdf https://archimer.ifremer.fr/doc/00618/72971/72038.pdf doi:10.1038/s41467-020-15101-6 https://archimer.ifremer.fr/doc/00618/72971/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1038/s41467-020-15101-6 |
container_title |
Nature Communications |
container_volume |
11 |
container_issue |
1 |
_version_ |
1766247517444374528 |