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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2020
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Online Access: | https://risweb.st-andrews.ac.uk/portal/en/researchoutput/the-nature-of-deep-overturning-and-reconfigurations-of-the-silicon-cycle-across-the-last-deglaciation(be5e20ab-b7d5-47fb-a492-74089a35977f).html https://doi.org/10.1038/s41467-020-15101-6 https://research-repository.st-andrews.ac.uk/bitstream/10023/19704/1/Dumont_2020_NC_Deepoverturning_CC.pdf |
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ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/be5e20ab-b7d5-47fb-a492-74089a35977f 2023-05-15T13:39:30+02:00 The nature of deep overturning and reconfigurations of the silicon cycle across the last deglaciation Dumont, Matthew Declan Pichevin, L. Geibert, W. Crosta, X. Michel, E. Moreton, S. Ganeshram, R. 2020-03-24 application/pdf https://risweb.st-andrews.ac.uk/portal/en/researchoutput/the-nature-of-deep-overturning-and-reconfigurations-of-the-silicon-cycle-across-the-last-deglaciation(be5e20ab-b7d5-47fb-a492-74089a35977f).html https://doi.org/10.1038/s41467-020-15101-6 https://research-repository.st-andrews.ac.uk/bitstream/10023/19704/1/Dumont_2020_NC_Deepoverturning_CC.pdf eng eng info:eu-repo/semantics/openAccess Dumont , M D , Pichevin , L , Geibert , W , Crosta , X , Michel , E , Moreton , S & Ganeshram , R 2020 , ' The nature of deep overturning and reconfigurations of the silicon cycle across the last deglaciation ' , Nature Communications , vol. 11 , 1534 . https://doi.org/10.1038/s41467-020-15101-6 article 2020 ftunstandrewcris https://doi.org/10.1038/s41467-020-15101-6 2022-06-02T07:51:18Z 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 University of St Andrews: Research Portal Antarctic Southern Ocean Nature Communications 11 1 |
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University of St Andrews: Research Portal |
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ftunstandrewcris |
language |
English |
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, Matthew Declan Pichevin, L. Geibert, W. Crosta, X. Michel, E. Moreton, S. Ganeshram, R. |
spellingShingle |
Dumont, Matthew Declan Pichevin, L. Geibert, W. Crosta, X. Michel, E. Moreton, S. Ganeshram, R. The nature of deep overturning and reconfigurations of the silicon cycle across the last deglaciation |
author_facet |
Dumont, Matthew Declan Pichevin, L. Geibert, W. Crosta, X. Michel, E. Moreton, S. Ganeshram, R. |
author_sort |
Dumont, Matthew Declan |
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://risweb.st-andrews.ac.uk/portal/en/researchoutput/the-nature-of-deep-overturning-and-reconfigurations-of-the-silicon-cycle-across-the-last-deglaciation(be5e20ab-b7d5-47fb-a492-74089a35977f).html https://doi.org/10.1038/s41467-020-15101-6 https://research-repository.st-andrews.ac.uk/bitstream/10023/19704/1/Dumont_2020_NC_Deepoverturning_CC.pdf |
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 |
Dumont , M D , Pichevin , L , Geibert , W , Crosta , X , Michel , E , Moreton , S & Ganeshram , R 2020 , ' The nature of deep overturning and reconfigurations of the silicon cycle across the last deglaciation ' , Nature Communications , vol. 11 , 1534 . https://doi.org/10.1038/s41467-020-15101-6 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1038/s41467-020-15101-6 |
container_title |
Nature Communications |
container_volume |
11 |
container_issue |
1 |
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1766119700250492928 |