Accelerated light carbon sequestration following late Paleocene-early Eocene carbon cycle perturbations
Carbon releases into the climate system produce global warming and ocean acidification events that can be reversed eventually by carbon sequestration. However, the underlying controls on the timescales of carbon removal, and their dependence on the amplitude of the initial perturbation, are poorly u...
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Online Access: | https://hdl.handle.net/11576/2714452 https://doi.org/10.1016/j.epsl.2023.117992 |
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ftunivurbino:oai:ora.uniurb.it:11576/2714452 2024-04-21T08:09:41+00:00 Accelerated light carbon sequestration following late Paleocene-early Eocene carbon cycle perturbations Piedrahita, Victor A. Zhao, Xiang Roberts, Andrew P. Rohling, Eelco J. Heslop, David Galeotti, Simone Rodríguez-Sanz, Laura Florindo, Fabio Grant, Katharine M. Piedrahita, Victor A. Zhao, Xiang Roberts, Andrew P. Rohling, Eelco J. Heslop, David Galeotti, Simone Rodríguez-Sanz, Laura Florindo, Fabio Grant, Katharine M. 2023 https://hdl.handle.net/11576/2714452 https://doi.org/10.1016/j.epsl.2023.117992 eng eng volume:604 firstpage:117992 journal:EARTH AND PLANETARY SCIENCE LETTERS https://hdl.handle.net/11576/2714452 doi:10.1016/j.epsl.2023.117992 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85146690914 accelerated carbon sequestration carbon cycle perturbation CIE recovery orbitally controlled light carbon injection info:eu-repo/semantics/article 2023 ftunivurbino https://doi.org/10.1016/j.epsl.2023.117992 2024-03-28T01:06:35Z Carbon releases into the climate system produce global warming and ocean acidification events that can be reversed eventually by carbon sequestration. However, the underlying controls on the timescales of carbon removal, and their dependence on the amplitude of the initial perturbation, are poorly understood. Here, we assess a series of late Paleocene-early Eocene (LPEE) carbon cycle perturbations (∼56-52 Ma) of different amplitudes to constrain carbon removal timescales. Carbon isotope excursions (CIEs) and sedimentation patterns for the largest event, the Paleocene-Eocene Thermal Maximum (PETM), allow identification of a light carbon injection that appeared ∼85 kyr after the PETM onset. This CIE may have been triggered by orbital forcing of long (∼400 kyr) and short (∼100 kyr) eccentricity maxima. The various LPEE light carbon injections were followed by exponential carbon removal trends with half-life (t1/2) estimates of ∼6-26 kyr. These values are smaller than background estimates for the modern carbon cycle (t1/2>100 kyr), which reveals accelerated light carbon sequestration. We find that one estimated t1/2 period coincided temporally with ocean acidification recovery in different locations with contrasting paleo-water depths. This pattern indicates enhanced chemical weathering following LPEE CIEs; however, chemical weathering timescales are an order of magnitude longer than the observed t1/2 estimates. This reveals that several carbon processes were optimized during LPEE CIE recovery. Similar t1/2 estimates are obtained for light carbon injections of different sizes, which suggests that carbon removal was optimized to conditions induced by the initial perturbation. Temperature controls on oxygen solubility may have accelerated the oceanic biological pump in proportion to each LPEE carbon injection. This process may have caused accelerated carbon sequestration during LPEE CIE recovery and produced the short carbon removal timescales identified by t1/2 estimates of LPEE carbon cycle perturbations. Article in Journal/Newspaper Ocean acidification Università degli Studi di Urbino: CINECA IRIS Earth and Planetary Science Letters 604 117992 |
institution |
Open Polar |
collection |
Università degli Studi di Urbino: CINECA IRIS |
op_collection_id |
ftunivurbino |
language |
English |
topic |
accelerated carbon sequestration carbon cycle perturbation CIE recovery orbitally controlled light carbon injection |
spellingShingle |
accelerated carbon sequestration carbon cycle perturbation CIE recovery orbitally controlled light carbon injection Piedrahita, Victor A. Zhao, Xiang Roberts, Andrew P. Rohling, Eelco J. Heslop, David Galeotti, Simone Rodríguez-Sanz, Laura Florindo, Fabio Grant, Katharine M. Accelerated light carbon sequestration following late Paleocene-early Eocene carbon cycle perturbations |
topic_facet |
accelerated carbon sequestration carbon cycle perturbation CIE recovery orbitally controlled light carbon injection |
description |
Carbon releases into the climate system produce global warming and ocean acidification events that can be reversed eventually by carbon sequestration. However, the underlying controls on the timescales of carbon removal, and their dependence on the amplitude of the initial perturbation, are poorly understood. Here, we assess a series of late Paleocene-early Eocene (LPEE) carbon cycle perturbations (∼56-52 Ma) of different amplitudes to constrain carbon removal timescales. Carbon isotope excursions (CIEs) and sedimentation patterns for the largest event, the Paleocene-Eocene Thermal Maximum (PETM), allow identification of a light carbon injection that appeared ∼85 kyr after the PETM onset. This CIE may have been triggered by orbital forcing of long (∼400 kyr) and short (∼100 kyr) eccentricity maxima. The various LPEE light carbon injections were followed by exponential carbon removal trends with half-life (t1/2) estimates of ∼6-26 kyr. These values are smaller than background estimates for the modern carbon cycle (t1/2>100 kyr), which reveals accelerated light carbon sequestration. We find that one estimated t1/2 period coincided temporally with ocean acidification recovery in different locations with contrasting paleo-water depths. This pattern indicates enhanced chemical weathering following LPEE CIEs; however, chemical weathering timescales are an order of magnitude longer than the observed t1/2 estimates. This reveals that several carbon processes were optimized during LPEE CIE recovery. Similar t1/2 estimates are obtained for light carbon injections of different sizes, which suggests that carbon removal was optimized to conditions induced by the initial perturbation. Temperature controls on oxygen solubility may have accelerated the oceanic biological pump in proportion to each LPEE carbon injection. This process may have caused accelerated carbon sequestration during LPEE CIE recovery and produced the short carbon removal timescales identified by t1/2 estimates of LPEE carbon cycle perturbations. |
author2 |
Piedrahita, Victor A. Zhao, Xiang Roberts, Andrew P. Rohling, Eelco J. Heslop, David Galeotti, Simone Rodríguez-Sanz, Laura Florindo, Fabio Grant, Katharine M. |
format |
Article in Journal/Newspaper |
author |
Piedrahita, Victor A. Zhao, Xiang Roberts, Andrew P. Rohling, Eelco J. Heslop, David Galeotti, Simone Rodríguez-Sanz, Laura Florindo, Fabio Grant, Katharine M. |
author_facet |
Piedrahita, Victor A. Zhao, Xiang Roberts, Andrew P. Rohling, Eelco J. Heslop, David Galeotti, Simone Rodríguez-Sanz, Laura Florindo, Fabio Grant, Katharine M. |
author_sort |
Piedrahita, Victor A. |
title |
Accelerated light carbon sequestration following late Paleocene-early Eocene carbon cycle perturbations |
title_short |
Accelerated light carbon sequestration following late Paleocene-early Eocene carbon cycle perturbations |
title_full |
Accelerated light carbon sequestration following late Paleocene-early Eocene carbon cycle perturbations |
title_fullStr |
Accelerated light carbon sequestration following late Paleocene-early Eocene carbon cycle perturbations |
title_full_unstemmed |
Accelerated light carbon sequestration following late Paleocene-early Eocene carbon cycle perturbations |
title_sort |
accelerated light carbon sequestration following late paleocene-early eocene carbon cycle perturbations |
publishDate |
2023 |
url |
https://hdl.handle.net/11576/2714452 https://doi.org/10.1016/j.epsl.2023.117992 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
volume:604 firstpage:117992 journal:EARTH AND PLANETARY SCIENCE LETTERS https://hdl.handle.net/11576/2714452 doi:10.1016/j.epsl.2023.117992 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85146690914 |
op_doi |
https://doi.org/10.1016/j.epsl.2023.117992 |
container_title |
Earth and Planetary Science Letters |
container_volume |
604 |
container_start_page |
117992 |
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1796950848034570240 |