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Repeated storage of respired carbon in the equatorial Pacific Ocean over the last three glacial cycles

As the largest reservoir of carbon exchanging with the atmosphere on glacial–interglacial timescales, the deep ocean has been implicated as the likely location of carbon sequestration during Pleistocene glaciations. Despite strong theoretical underpinning for this expectation, radiocarbon data on wa...

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Autores principales: Jacobel, A. W., McManus, J. F., Anderson, R. F., Winckler, G.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5700088/
https://www.ncbi.nlm.nih.gov/pubmed/29167433
http://dx.doi.org/10.1038/s41467-017-01938-x
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author Jacobel, A. W.
McManus, J. F.
Anderson, R. F.
Winckler, G.
author_facet Jacobel, A. W.
McManus, J. F.
Anderson, R. F.
Winckler, G.
author_sort Jacobel, A. W.
collection PubMed
description As the largest reservoir of carbon exchanging with the atmosphere on glacial–interglacial timescales, the deep ocean has been implicated as the likely location of carbon sequestration during Pleistocene glaciations. Despite strong theoretical underpinning for this expectation, radiocarbon data on watermass ventilation ages conflict, and proxy interpretations disagree about the depth, origin and even existence of the respired carbon pool. Because any change in the storage of respiratory carbon is accompanied by corresponding changes in dissolved oxygen concentrations, proxy data reflecting oxygenation are valuable in addressing these apparent inconsistencies. Here, we present a record of redox-sensitive uranium from the central equatorial Pacific Ocean to identify intervals associated with respiratory carbon storage over the past 350 kyr, providing evidence for repeated carbon storage over the last three glacial cycles. We also synthesise our data with previous work and propose an internally consistent picture of glacial carbon storage and equatorial Pacific Ocean watermass structure.
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spelling pubmed-57000882017-11-24 Repeated storage of respired carbon in the equatorial Pacific Ocean over the last three glacial cycles Jacobel, A. W. McManus, J. F. Anderson, R. F. Winckler, G. Nat Commun Article As the largest reservoir of carbon exchanging with the atmosphere on glacial–interglacial timescales, the deep ocean has been implicated as the likely location of carbon sequestration during Pleistocene glaciations. Despite strong theoretical underpinning for this expectation, radiocarbon data on watermass ventilation ages conflict, and proxy interpretations disagree about the depth, origin and even existence of the respired carbon pool. Because any change in the storage of respiratory carbon is accompanied by corresponding changes in dissolved oxygen concentrations, proxy data reflecting oxygenation are valuable in addressing these apparent inconsistencies. Here, we present a record of redox-sensitive uranium from the central equatorial Pacific Ocean to identify intervals associated with respiratory carbon storage over the past 350 kyr, providing evidence for repeated carbon storage over the last three glacial cycles. We also synthesise our data with previous work and propose an internally consistent picture of glacial carbon storage and equatorial Pacific Ocean watermass structure. Nature Publishing Group UK 2017-11-23 /pmc/articles/PMC5700088/ /pubmed/29167433 http://dx.doi.org/10.1038/s41467-017-01938-x Text en © The Author(s) 2017 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 Commonslicense, unless indicated otherwise in a credit line to the material. If material is not included in the article’sCreative 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, visithttp://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Jacobel, A. W.
McManus, J. F.
Anderson, R. F.
Winckler, G.
Repeated storage of respired carbon in the equatorial Pacific Ocean over the last three glacial cycles
title Repeated storage of respired carbon in the equatorial Pacific Ocean over the last three glacial cycles
title_full Repeated storage of respired carbon in the equatorial Pacific Ocean over the last three glacial cycles
title_fullStr Repeated storage of respired carbon in the equatorial Pacific Ocean over the last three glacial cycles
title_full_unstemmed Repeated storage of respired carbon in the equatorial Pacific Ocean over the last three glacial cycles
title_short Repeated storage of respired carbon in the equatorial Pacific Ocean over the last three glacial cycles
title_sort repeated storage of respired carbon in the equatorial pacific ocean over the last three glacial cycles
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5700088/
https://www.ncbi.nlm.nih.gov/pubmed/29167433
http://dx.doi.org/10.1038/s41467-017-01938-x
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