The seawater carbon inventory at the Paleocene–Eocene Thermal Maximum
The Paleocene–Eocene Thermal Maximum (PETM) (55.6 Mya) was a geologically rapid carbon-release event that is considered the closest natural analog to anthropogenic CO(2) emissions. Recent work has used boron-based proxies in planktic foraminifera to characterize the extent of surface-ocean acidifica...
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ftpubmed:oai:pubmedcentral.nih.gov:7533689 2023-05-15T17:51:13+02:00 The seawater carbon inventory at the Paleocene–Eocene Thermal Maximum Haynes, Laura L. Hönisch, Bärbel 2020-09-29 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7533689/ http://www.ncbi.nlm.nih.gov/pubmed/32929018 https://doi.org/10.1073/pnas.2003197117 en eng National Academy of Sciences http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7533689/ http://www.ncbi.nlm.nih.gov/pubmed/32929018 http://dx.doi.org/10.1073/pnas.2003197117 https://www.pnas.org/site/aboutpnas/licenses.xhtmlPublished under the PNAS license (https://www.pnas.org/site/aboutpnas/licenses.xhtml) . Proc Natl Acad Sci U S A Physical Sciences Text 2020 ftpubmed https://doi.org/10.1073/pnas.2003197117 2021-03-21T01:20:23Z The Paleocene–Eocene Thermal Maximum (PETM) (55.6 Mya) was a geologically rapid carbon-release event that is considered the closest natural analog to anthropogenic CO(2) emissions. Recent work has used boron-based proxies in planktic foraminifera to characterize the extent of surface-ocean acidification that occurred during the event. However, seawater acidity alone provides an incomplete constraint on the nature and source of carbon release. Here, we apply previously undescribed culture calibrations for the B/Ca proxy in planktic foraminifera and use them to calculate relative changes in seawater-dissolved inorganic carbon (DIC) concentration, surmising that Pacific surface-ocean DIC increased by [Formula: see text] µmol/kg during the peak-PETM. Making reasonable assumptions for the pre-PETM oceanic DIC inventory, we provide a fully data-driven estimate of the PETM carbon source. Our reconstruction yields a mean source carbon δ(13)C of −10‰ and a mean increase in the oceanic C inventory of +14,900 petagrams of carbon (PgC), pointing to volcanic CO(2) emissions as the main carbon source responsible for PETM warming. Text Ocean acidification PubMed Central (PMC) Pacific Proceedings of the National Academy of Sciences 117 39 24088 24095 |
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Physical Sciences |
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Physical Sciences Haynes, Laura L. Hönisch, Bärbel The seawater carbon inventory at the Paleocene–Eocene Thermal Maximum |
topic_facet |
Physical Sciences |
description |
The Paleocene–Eocene Thermal Maximum (PETM) (55.6 Mya) was a geologically rapid carbon-release event that is considered the closest natural analog to anthropogenic CO(2) emissions. Recent work has used boron-based proxies in planktic foraminifera to characterize the extent of surface-ocean acidification that occurred during the event. However, seawater acidity alone provides an incomplete constraint on the nature and source of carbon release. Here, we apply previously undescribed culture calibrations for the B/Ca proxy in planktic foraminifera and use them to calculate relative changes in seawater-dissolved inorganic carbon (DIC) concentration, surmising that Pacific surface-ocean DIC increased by [Formula: see text] µmol/kg during the peak-PETM. Making reasonable assumptions for the pre-PETM oceanic DIC inventory, we provide a fully data-driven estimate of the PETM carbon source. Our reconstruction yields a mean source carbon δ(13)C of −10‰ and a mean increase in the oceanic C inventory of +14,900 petagrams of carbon (PgC), pointing to volcanic CO(2) emissions as the main carbon source responsible for PETM warming. |
format |
Text |
author |
Haynes, Laura L. Hönisch, Bärbel |
author_facet |
Haynes, Laura L. Hönisch, Bärbel |
author_sort |
Haynes, Laura L. |
title |
The seawater carbon inventory at the Paleocene–Eocene Thermal Maximum |
title_short |
The seawater carbon inventory at the Paleocene–Eocene Thermal Maximum |
title_full |
The seawater carbon inventory at the Paleocene–Eocene Thermal Maximum |
title_fullStr |
The seawater carbon inventory at the Paleocene–Eocene Thermal Maximum |
title_full_unstemmed |
The seawater carbon inventory at the Paleocene–Eocene Thermal Maximum |
title_sort |
seawater carbon inventory at the paleocene–eocene thermal maximum |
publisher |
National Academy of Sciences |
publishDate |
2020 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7533689/ http://www.ncbi.nlm.nih.gov/pubmed/32929018 https://doi.org/10.1073/pnas.2003197117 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Proc Natl Acad Sci U S A |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7533689/ http://www.ncbi.nlm.nih.gov/pubmed/32929018 http://dx.doi.org/10.1073/pnas.2003197117 |
op_rights |
https://www.pnas.org/site/aboutpnas/licenses.xhtmlPublished under the PNAS license (https://www.pnas.org/site/aboutpnas/licenses.xhtml) . |
op_doi |
https://doi.org/10.1073/pnas.2003197117 |
container_title |
Proceedings of the National Academy of Sciences |
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117 |
container_issue |
39 |
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24088 |
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24095 |
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1766158298635042816 |