An abyssal carbonate compensation depth overshoot in the aftermath of the Palaeocene-Eocene thermal maximum
International audience During the Palaeocene–Eocene Thermal Maximum (PETM) about 56 million years ago, thousands of petagrams of carbon were released into the atmosphere and ocean in just a few thousand years, followed by gradual sequestration over approximately 200,000 years. If silicate weathering...
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ftccsdartic:oai:HAL:hal-01407677v1 2023-05-15T17:31:21+02:00 An abyssal carbonate compensation depth overshoot in the aftermath of the Palaeocene-Eocene thermal maximum Penman, Donald E. Turner, Sandra Kirtland Sexton, Philip F. Norris, Richard D. Dickson, Alexander J. Boulila, Slah Ridgwell, Andy Zeebe, Richard E. Zachos, James C. Cameron, Adele Röhl, Thomas Westerhold& Ursula Institut des Sciences de la Terre de Paris (iSTeP) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) 2016 https://hal.archives-ouvertes.fr/hal-01407677 https://doi.org/10.1038/ngeo2757 en eng HAL CCSD Nature Publishing Group info:eu-repo/semantics/altIdentifier/doi/10.1038/ngeo2757 hal-01407677 https://hal.archives-ouvertes.fr/hal-01407677 doi:10.1038/ngeo2757 ISSN: 1752-0894 Nature Geoscience https://hal.archives-ouvertes.fr/hal-01407677 Nature Geoscience, Nature Publishing Group, 2016, 9, pp.575-580. ⟨10.1038/ngeo2757⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2016 ftccsdartic https://doi.org/10.1038/ngeo2757 2021-11-21T02:39:56Z International audience During the Palaeocene–Eocene Thermal Maximum (PETM) about 56 million years ago, thousands of petagrams of carbon were released into the atmosphere and ocean in just a few thousand years, followed by gradual sequestration over approximately 200,000 years. If silicate weathering is one of the key negative feedbacks that removed this carbon, a period of seawater calcium carbonate saturation greater than pre-event levels would be expected during the event's recovery phase. In marine sediments, this should be recorded as a temporary deepening of the depth below which no calcite is preserved — the calcite compensation depth (CCD). Previous and new sedimentary records from sites that were above the pre-PETM CCD show enhanced carbonate accumulation following the PETM. A new record from an abyssal site in the North Atlantic that lay below the pre-PETM CCD shows a period of carbonate preservation beginning about 70,000 years after the onset of the PETM, providing the first direct evidence for an over-deepening of the CCD. This record confirms an overshoot in ocean carbonate saturation during the PETM recovery. Simulations with two earth system models support scenarios for the PETM that involve a large initial carbon release followed by prolonged low-level emissions, consistent with the timing of CCD deepening in our record. Our findings indicate that sequestration of these carbon emissions was most likely the result of both globally enhanced calcite burial above the CCD and, at least in the North Atlantic, an over-deepening of the CCD. Article in Journal/Newspaper North Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Nature Geoscience 9 8 575 580 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Penman, Donald E. Turner, Sandra Kirtland Sexton, Philip F. Norris, Richard D. Dickson, Alexander J. Boulila, Slah Ridgwell, Andy Zeebe, Richard E. Zachos, James C. Cameron, Adele Röhl, Thomas Westerhold& Ursula An abyssal carbonate compensation depth overshoot in the aftermath of the Palaeocene-Eocene thermal maximum |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience During the Palaeocene–Eocene Thermal Maximum (PETM) about 56 million years ago, thousands of petagrams of carbon were released into the atmosphere and ocean in just a few thousand years, followed by gradual sequestration over approximately 200,000 years. If silicate weathering is one of the key negative feedbacks that removed this carbon, a period of seawater calcium carbonate saturation greater than pre-event levels would be expected during the event's recovery phase. In marine sediments, this should be recorded as a temporary deepening of the depth below which no calcite is preserved — the calcite compensation depth (CCD). Previous and new sedimentary records from sites that were above the pre-PETM CCD show enhanced carbonate accumulation following the PETM. A new record from an abyssal site in the North Atlantic that lay below the pre-PETM CCD shows a period of carbonate preservation beginning about 70,000 years after the onset of the PETM, providing the first direct evidence for an over-deepening of the CCD. This record confirms an overshoot in ocean carbonate saturation during the PETM recovery. Simulations with two earth system models support scenarios for the PETM that involve a large initial carbon release followed by prolonged low-level emissions, consistent with the timing of CCD deepening in our record. Our findings indicate that sequestration of these carbon emissions was most likely the result of both globally enhanced calcite burial above the CCD and, at least in the North Atlantic, an over-deepening of the CCD. |
author2 |
Institut des Sciences de la Terre de Paris (iSTeP) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Penman, Donald E. Turner, Sandra Kirtland Sexton, Philip F. Norris, Richard D. Dickson, Alexander J. Boulila, Slah Ridgwell, Andy Zeebe, Richard E. Zachos, James C. Cameron, Adele Röhl, Thomas Westerhold& Ursula |
author_facet |
Penman, Donald E. Turner, Sandra Kirtland Sexton, Philip F. Norris, Richard D. Dickson, Alexander J. Boulila, Slah Ridgwell, Andy Zeebe, Richard E. Zachos, James C. Cameron, Adele Röhl, Thomas Westerhold& Ursula |
author_sort |
Penman, Donald E. |
title |
An abyssal carbonate compensation depth overshoot in the aftermath of the Palaeocene-Eocene thermal maximum |
title_short |
An abyssal carbonate compensation depth overshoot in the aftermath of the Palaeocene-Eocene thermal maximum |
title_full |
An abyssal carbonate compensation depth overshoot in the aftermath of the Palaeocene-Eocene thermal maximum |
title_fullStr |
An abyssal carbonate compensation depth overshoot in the aftermath of the Palaeocene-Eocene thermal maximum |
title_full_unstemmed |
An abyssal carbonate compensation depth overshoot in the aftermath of the Palaeocene-Eocene thermal maximum |
title_sort |
abyssal carbonate compensation depth overshoot in the aftermath of the palaeocene-eocene thermal maximum |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.archives-ouvertes.fr/hal-01407677 https://doi.org/10.1038/ngeo2757 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 1752-0894 Nature Geoscience https://hal.archives-ouvertes.fr/hal-01407677 Nature Geoscience, Nature Publishing Group, 2016, 9, pp.575-580. ⟨10.1038/ngeo2757⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1038/ngeo2757 hal-01407677 https://hal.archives-ouvertes.fr/hal-01407677 doi:10.1038/ngeo2757 |
op_doi |
https://doi.org/10.1038/ngeo2757 |
container_title |
Nature Geoscience |
container_volume |
9 |
container_issue |
8 |
container_start_page |
575 |
op_container_end_page |
580 |
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1766128862958190592 |