Cargando…

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...

Descripción completa

Detalles Bibliográficos
Autores principales: Dumont, M., Pichevin, L., Geibert, W., Crosta, X., Michel, E., Moreton, S., Dobby, K., Ganeshram, R.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7093442/
https://www.ncbi.nlm.nih.gov/pubmed/32210225
http://dx.doi.org/10.1038/s41467-020-15101-6
_version_ 1783510284398231552
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.
collection PubMed
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 Online
Article
Text
id pubmed-7093442
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher Nature Publishing Group UK
record_format MEDLINE/PubMed
spelling pubmed-70934422020-03-26 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. Nat Commun Article 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. Nature Publishing Group UK 2020-03-24 /pmc/articles/PMC7093442/ /pubmed/32210225 http://dx.doi.org/10.1038/s41467-020-15101-6 Text en © 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/.
spellingShingle 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
title 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_short 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
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7093442/
https://www.ncbi.nlm.nih.gov/pubmed/32210225
http://dx.doi.org/10.1038/s41467-020-15101-6
work_keys_str_mv AT dumontm thenatureofdeepoverturningandreconfigurationsofthesiliconcycleacrossthelastdeglaciation
AT pichevinl thenatureofdeepoverturningandreconfigurationsofthesiliconcycleacrossthelastdeglaciation
AT geibertw thenatureofdeepoverturningandreconfigurationsofthesiliconcycleacrossthelastdeglaciation
AT crostax thenatureofdeepoverturningandreconfigurationsofthesiliconcycleacrossthelastdeglaciation
AT michele thenatureofdeepoverturningandreconfigurationsofthesiliconcycleacrossthelastdeglaciation
AT moretons thenatureofdeepoverturningandreconfigurationsofthesiliconcycleacrossthelastdeglaciation
AT dobbyk thenatureofdeepoverturningandreconfigurationsofthesiliconcycleacrossthelastdeglaciation
AT ganeshramr thenatureofdeepoverturningandreconfigurationsofthesiliconcycleacrossthelastdeglaciation
AT dumontm natureofdeepoverturningandreconfigurationsofthesiliconcycleacrossthelastdeglaciation
AT pichevinl natureofdeepoverturningandreconfigurationsofthesiliconcycleacrossthelastdeglaciation
AT geibertw natureofdeepoverturningandreconfigurationsofthesiliconcycleacrossthelastdeglaciation
AT crostax natureofdeepoverturningandreconfigurationsofthesiliconcycleacrossthelastdeglaciation
AT michele natureofdeepoverturningandreconfigurationsofthesiliconcycleacrossthelastdeglaciation
AT moretons natureofdeepoverturningandreconfigurationsofthesiliconcycleacrossthelastdeglaciation
AT dobbyk natureofdeepoverturningandreconfigurationsofthesiliconcycleacrossthelastdeglaciation
AT ganeshramr natureofdeepoverturningandreconfigurationsofthesiliconcycleacrossthelastdeglaciation