New constraints on massive carbon release and recovery processes during the Paleocene-Eocene Thermal Maximum
Recent geochemical and sedimentological evidence constrains the response of seawater chemistry to carbon injection during the Paleocene-Eocene Thermal Maximum (PETM): foraminiferal boron-based proxy records constrain the magnitude and duration of surface ocean acidification, while new deep sea recor...
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ftdoajarticles:oai:doaj.org/article:68698ef51d9148b294982674ef6ae685 2023-09-05T13:22:13+02:00 New constraints on massive carbon release and recovery processes during the Paleocene-Eocene Thermal Maximum Donald E Penman James C Zachos 2018-01-01T00:00:00Z https://doi.org/10.1088/1748-9326/aae285 https://doaj.org/article/68698ef51d9148b294982674ef6ae685 EN eng IOP Publishing https://doi.org/10.1088/1748-9326/aae285 https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/aae285 1748-9326 https://doaj.org/article/68698ef51d9148b294982674ef6ae685 Environmental Research Letters, Vol 13, Iss 10, p 105008 (2018) PETM carbon cycle ocean acidification Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 article 2018 ftdoajarticles https://doi.org/10.1088/1748-9326/aae285 2023-08-13T00:37:31Z Recent geochemical and sedimentological evidence constrains the response of seawater chemistry to carbon injection during the Paleocene-Eocene Thermal Maximum (PETM): foraminiferal boron-based proxy records constrain the magnitude and duration of surface ocean acidification, while new deep sea records document a carbonate compensation depth (CCD) over-shoot during the recovery. Such features can be used to more tightly constrain simulations of the event within carbon cycle models, and thus test mechanisms for carbon release, buffering, and sequestration. We use the LOSCAR carbon cycle model to examine first the onset of, and then recovery from the PETM. We systematically varied the mass, rate, and location of C release along with changes in ocean circulation patterns as well as initial conditions such as pre-event p CO _2 and the strength of weathering feedbacks. A range of input parameters produced output that successfully conformed to observational constraints on the event’s onset. However, none of the successful scenarios featured surface seawater aragonite or calcite undersaturation at even peak PETM conditions (in contrast to anthropogenic acidification projections), and most runs featured approximately a doubling of p CO _2 relative to pre-event conditions (suggesting a high PETM climate sensitivity). Further runs test scenarios of the body and recovery of the PETM against records of sustained acidification followed by rapid pH recovery in boron records, as well as the timing and depth of the CCD overshoot. Successful scenarios all require a sustained release of carbon over many tens of thousands of years following the onset (comparable to the mass released during the onset) and removal of carbon (likely as burial of organic carbon in addition to elevated chemical weathering rates) during the recovery. This sequence of events is consistent with a short-lived feedback involving the release of ^13 C-depleted C in response to initial warming followed by its subsequent sequestration during the cooling phase. Article in Journal/Newspaper Ocean acidification Directory of Open Access Journals: DOAJ Articles Environmental Research Letters 13 10 105008 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
PETM carbon cycle ocean acidification Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
spellingShingle |
PETM carbon cycle ocean acidification Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 Donald E Penman James C Zachos New constraints on massive carbon release and recovery processes during the Paleocene-Eocene Thermal Maximum |
topic_facet |
PETM carbon cycle ocean acidification Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
description |
Recent geochemical and sedimentological evidence constrains the response of seawater chemistry to carbon injection during the Paleocene-Eocene Thermal Maximum (PETM): foraminiferal boron-based proxy records constrain the magnitude and duration of surface ocean acidification, while new deep sea records document a carbonate compensation depth (CCD) over-shoot during the recovery. Such features can be used to more tightly constrain simulations of the event within carbon cycle models, and thus test mechanisms for carbon release, buffering, and sequestration. We use the LOSCAR carbon cycle model to examine first the onset of, and then recovery from the PETM. We systematically varied the mass, rate, and location of C release along with changes in ocean circulation patterns as well as initial conditions such as pre-event p CO _2 and the strength of weathering feedbacks. A range of input parameters produced output that successfully conformed to observational constraints on the event’s onset. However, none of the successful scenarios featured surface seawater aragonite or calcite undersaturation at even peak PETM conditions (in contrast to anthropogenic acidification projections), and most runs featured approximately a doubling of p CO _2 relative to pre-event conditions (suggesting a high PETM climate sensitivity). Further runs test scenarios of the body and recovery of the PETM against records of sustained acidification followed by rapid pH recovery in boron records, as well as the timing and depth of the CCD overshoot. Successful scenarios all require a sustained release of carbon over many tens of thousands of years following the onset (comparable to the mass released during the onset) and removal of carbon (likely as burial of organic carbon in addition to elevated chemical weathering rates) during the recovery. This sequence of events is consistent with a short-lived feedback involving the release of ^13 C-depleted C in response to initial warming followed by its subsequent sequestration during the cooling phase. |
format |
Article in Journal/Newspaper |
author |
Donald E Penman James C Zachos |
author_facet |
Donald E Penman James C Zachos |
author_sort |
Donald E Penman |
title |
New constraints on massive carbon release and recovery processes during the Paleocene-Eocene Thermal Maximum |
title_short |
New constraints on massive carbon release and recovery processes during the Paleocene-Eocene Thermal Maximum |
title_full |
New constraints on massive carbon release and recovery processes during the Paleocene-Eocene Thermal Maximum |
title_fullStr |
New constraints on massive carbon release and recovery processes during the Paleocene-Eocene Thermal Maximum |
title_full_unstemmed |
New constraints on massive carbon release and recovery processes during the Paleocene-Eocene Thermal Maximum |
title_sort |
new constraints on massive carbon release and recovery processes during the paleocene-eocene thermal maximum |
publisher |
IOP Publishing |
publishDate |
2018 |
url |
https://doi.org/10.1088/1748-9326/aae285 https://doaj.org/article/68698ef51d9148b294982674ef6ae685 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Environmental Research Letters, Vol 13, Iss 10, p 105008 (2018) |
op_relation |
https://doi.org/10.1088/1748-9326/aae285 https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/aae285 1748-9326 https://doaj.org/article/68698ef51d9148b294982674ef6ae685 |
op_doi |
https://doi.org/10.1088/1748-9326/aae285 |
container_title |
Environmental Research Letters |
container_volume |
13 |
container_issue |
10 |
container_start_page |
105008 |
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1776202752381157376 |