Increased export production during recovery from the Paleocene–Eocene thermal maximum constrained by sedimentary Ba isotopes
The Paleocene–Eocene thermal maximum (PETM; ∼56 Ma) was a transient global warming event associated with a huge perturbation to the global carbon cycle. Changes in marine biological productivity may have contributed to the rapid recovery from this climate change event, by driving the burial of inorg...
Published in: | Earth and Planetary Science Letters |
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Online Access: | https://doi.org/10.1016/j.epsl.2018.12.036 https://ora.ox.ac.uk/objects/uuid:243768fc-8918-4564-9315-499cd762bfc3 |
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ftuloxford:oai:ora.ox.ac.uk:uuid:243768fc-8918-4564-9315-499cd762bfc3 2023-05-15T18:25:49+02:00 Increased export production during recovery from the Paleocene–Eocene thermal maximum constrained by sedimentary Ba isotopes Bridgestock, L Hsieh, Y-T Porcelli, D Henderson, G 2019-02-04 https://doi.org/10.1016/j.epsl.2018.12.036 https://ora.ox.ac.uk/objects/uuid:243768fc-8918-4564-9315-499cd762bfc3 unknown Elsevier doi:10.1016/j.epsl.2018.12.036 https://ora.ox.ac.uk/objects/uuid:243768fc-8918-4564-9315-499cd762bfc3 https://doi.org/10.1016/j.epsl.2018.12.036 info:eu-repo/semantics/openAccess CC Attribution-NonCommercial-NoDerivatives (CC BY-NC-ND) CC-BY-NC-ND Journal article 2019 ftuloxford https://doi.org/10.1016/j.epsl.2018.12.036 2022-06-28T20:07:55Z The Paleocene–Eocene thermal maximum (PETM; ∼56 Ma) was a transient global warming event associated with a huge perturbation to the global carbon cycle. Changes in marine biological productivity may have contributed to the rapid recovery from this climate change event, by driving the burial of inorganic and organic carbon. Disagreement between proxy reconstructions, however, makes the response of biological productivity to climatic changes experienced during the PETM uncertain. Accumulation of non-detrital barium (Ba) in marine sediments is a commonly used proxy for export production. This proxy however can be compromised by artifacts resulting from dilution and changes in barite preservation, issues that have been debated for its application to sediments deposited during the PETM. Here we present a new approach to address these limitations, by combining non-detrital Ba accumulation with Ba isotope data for marine PETM sediments. Observed positive correlation between these variables is consistent with their control by local changes in export production. These results help resolve previous discrepancies between productivity reconstructions, and indicate export production at sites in the Southern Ocean and South Atlantic decreased or remained unchanged following the PETM onset, followed by an increase to maximum values in the PETM recovery period. This increase in export production coincides with elevated carbonate accumulation rates, representing an important mode of carbon sequestration. These new constraints therefore support the idea that increased production and export of calcifying nannoplankton, perhaps driven by changes in ocean stratification and/or terrestrial runoff, played an important role in rapid recovery from the PETM. This work also demonstrates the utility of sedimentary Ba isotope compositions for understanding past changes in the marine carbon cycle. Article in Journal/Newspaper Southern Ocean ORA - Oxford University Research Archive Southern Ocean Earth and Planetary Science Letters 510 53 63 |
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Open Polar |
collection |
ORA - Oxford University Research Archive |
op_collection_id |
ftuloxford |
language |
unknown |
description |
The Paleocene–Eocene thermal maximum (PETM; ∼56 Ma) was a transient global warming event associated with a huge perturbation to the global carbon cycle. Changes in marine biological productivity may have contributed to the rapid recovery from this climate change event, by driving the burial of inorganic and organic carbon. Disagreement between proxy reconstructions, however, makes the response of biological productivity to climatic changes experienced during the PETM uncertain. Accumulation of non-detrital barium (Ba) in marine sediments is a commonly used proxy for export production. This proxy however can be compromised by artifacts resulting from dilution and changes in barite preservation, issues that have been debated for its application to sediments deposited during the PETM. Here we present a new approach to address these limitations, by combining non-detrital Ba accumulation with Ba isotope data for marine PETM sediments. Observed positive correlation between these variables is consistent with their control by local changes in export production. These results help resolve previous discrepancies between productivity reconstructions, and indicate export production at sites in the Southern Ocean and South Atlantic decreased or remained unchanged following the PETM onset, followed by an increase to maximum values in the PETM recovery period. This increase in export production coincides with elevated carbonate accumulation rates, representing an important mode of carbon sequestration. These new constraints therefore support the idea that increased production and export of calcifying nannoplankton, perhaps driven by changes in ocean stratification and/or terrestrial runoff, played an important role in rapid recovery from the PETM. This work also demonstrates the utility of sedimentary Ba isotope compositions for understanding past changes in the marine carbon cycle. |
format |
Article in Journal/Newspaper |
author |
Bridgestock, L Hsieh, Y-T Porcelli, D Henderson, G |
spellingShingle |
Bridgestock, L Hsieh, Y-T Porcelli, D Henderson, G Increased export production during recovery from the Paleocene–Eocene thermal maximum constrained by sedimentary Ba isotopes |
author_facet |
Bridgestock, L Hsieh, Y-T Porcelli, D Henderson, G |
author_sort |
Bridgestock, L |
title |
Increased export production during recovery from the Paleocene–Eocene thermal maximum constrained by sedimentary Ba isotopes |
title_short |
Increased export production during recovery from the Paleocene–Eocene thermal maximum constrained by sedimentary Ba isotopes |
title_full |
Increased export production during recovery from the Paleocene–Eocene thermal maximum constrained by sedimentary Ba isotopes |
title_fullStr |
Increased export production during recovery from the Paleocene–Eocene thermal maximum constrained by sedimentary Ba isotopes |
title_full_unstemmed |
Increased export production during recovery from the Paleocene–Eocene thermal maximum constrained by sedimentary Ba isotopes |
title_sort |
increased export production during recovery from the paleocene–eocene thermal maximum constrained by sedimentary ba isotopes |
publisher |
Elsevier |
publishDate |
2019 |
url |
https://doi.org/10.1016/j.epsl.2018.12.036 https://ora.ox.ac.uk/objects/uuid:243768fc-8918-4564-9315-499cd762bfc3 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
doi:10.1016/j.epsl.2018.12.036 https://ora.ox.ac.uk/objects/uuid:243768fc-8918-4564-9315-499cd762bfc3 https://doi.org/10.1016/j.epsl.2018.12.036 |
op_rights |
info:eu-repo/semantics/openAccess CC Attribution-NonCommercial-NoDerivatives (CC BY-NC-ND) |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.epsl.2018.12.036 |
container_title |
Earth and Planetary Science Letters |
container_volume |
510 |
container_start_page |
53 |
op_container_end_page |
63 |
_version_ |
1766207483471200256 |