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 CO 2 across the last deglaciation; however, the processes involved remain uncertain. Previous records have hinted at a partitioning of deep ocean ventilation across the two...
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ftoskarbordeaux:oai:oskar-bordeaux.fr:20.500.12278/189008 2024-04-28T07:58:14+00:00 The nature of deep overturning and reconfigurations of the silicon cycle across the last deglaciation DUMONT, M. PICHEVIN, L. GEIBERT, W. CROSTA, Xavier MICHEL, Elisabeth MORETON, S. DOBBY, K. GANESHRAM, R. 2020-03-24 https://oskar-bordeaux.fr/handle/20.500.12278/189008 https://hdl.handle.net/20.500.12278/189008 https://doi.org/10.1038/s41467-020-15101-6 EN eng 2041-1723 https://oskar-bordeaux.fr/handle/20.500.12278/189008 doi:10.1038/s41467-020-15101-6 open Pas de Licence CC Planète et Univers [physics]/Sciences de la Terre/Climatologie Planète et Univers [physics]/Océan Atmosphère Planète et Univers [physics]/Sciences de la Terre/Océanographie Article de revue 2020 ftoskarbordeaux https://doi.org/20.500.12278/18900810.1038/s41467-020-15101-6 2024-04-01T15:43:20Z Changes in ocean circulation and the biological carbon pump have been implicated as the drivers behind the rise in atmospheric CO 2 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 CO 2 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 CO 2 concentrations. Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean OSKAR Bordeaux (Open Science Knowledge ARchive) Nature Communications 11 1 |
institution |
Open Polar |
collection |
OSKAR Bordeaux (Open Science Knowledge ARchive) |
op_collection_id |
ftoskarbordeaux |
language |
English |
topic |
Planète et Univers [physics]/Sciences de la Terre/Climatologie Planète et Univers [physics]/Océan Atmosphère Planète et Univers [physics]/Sciences de la Terre/Océanographie |
spellingShingle |
Planète et Univers [physics]/Sciences de la Terre/Climatologie Planète et Univers [physics]/Océan Atmosphère Planète et Univers [physics]/Sciences de la Terre/Océanographie DUMONT, M. PICHEVIN, L. GEIBERT, W. CROSTA, Xavier MICHEL, Elisabeth MORETON, S. DOBBY, K. GANESHRAM, R. The nature of deep overturning and reconfigurations of the silicon cycle across the last deglaciation |
topic_facet |
Planète et Univers [physics]/Sciences de la Terre/Climatologie Planète et Univers [physics]/Océan Atmosphère Planète et Univers [physics]/Sciences de la Terre/Océanographie |
description |
Changes in ocean circulation and the biological carbon pump have been implicated as the drivers behind the rise in atmospheric CO 2 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 CO 2 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 CO 2 concentrations. |
format |
Article in Journal/Newspaper |
author |
DUMONT, M. PICHEVIN, L. GEIBERT, W. CROSTA, Xavier MICHEL, Elisabeth MORETON, S. DOBBY, K. GANESHRAM, R. |
author_facet |
DUMONT, M. PICHEVIN, L. GEIBERT, W. CROSTA, Xavier MICHEL, Elisabeth 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 |
publishDate |
2020 |
url |
https://oskar-bordeaux.fr/handle/20.500.12278/189008 https://hdl.handle.net/20.500.12278/189008 https://doi.org/10.1038/s41467-020-15101-6 |
genre |
Antarc* Antarctic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean |
op_relation |
2041-1723 https://oskar-bordeaux.fr/handle/20.500.12278/189008 doi:10.1038/s41467-020-15101-6 |
op_rights |
open Pas de Licence CC |
op_doi |
https://doi.org/20.500.12278/18900810.1038/s41467-020-15101-6 |
container_title |
Nature Communications |
container_volume |
11 |
container_issue |
1 |
_version_ |
1797568399197339648 |