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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ftpubmed:oai:pubmedcentral.nih.gov:7093442 2023-05-15T13:51:05+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. 2020-03-24 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7093442/ https://doi.org/10.1038/s41467-020-15101-6 en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7093442/ http://dx.doi.org/10.1038/s41467-020-15101-6 © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. CC-BY Article Text 2020 ftpubmed https://doi.org/10.1038/s41467-020-15101-6 2020-03-29T01:51:47Z 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. Text Antarc* Antarctic Sea ice Southern Ocean PubMed Central (PMC) Antarctic Southern Ocean Nature Communications 11 1 |
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Article 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 |
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Article |
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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 |
Text |
author |
Dumont, M. Pichevin, L. Geibert, W. Crosta, X. Michel, E. Moreton, S. Dobby, K. Ganeshram, R. |
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 |
Nature Publishing Group UK |
publishDate |
2020 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7093442/ https://doi.org/10.1038/s41467-020-15101-6 |
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_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7093442/ http://dx.doi.org/10.1038/s41467-020-15101-6 |
op_rights |
© The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/s41467-020-15101-6 |
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Nature Communications |
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11 |
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1 |
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1766254690136227840 |