Very large release of mostly volcanic carbon during the Palaeocene-Eocene Thermal Maximum.
The Palaeocene-Eocene Thermal Maximum (PETM) was a global warming event that occurred about 56 million years ago, and is commonly thought to have been driven primarily by the destabilization of carbon from surface sedimentary reservoirs such as methane hydrates. However, it remains controversial whe...
Main Authors: | , , , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
eScholarship, University of California
2017
|
Subjects: | |
Online Access: | https://escholarship.org/uc/item/1n988123 |
id |
ftcdlib:oai:escholarship.org:ark:/13030/qt1n988123 |
---|---|
record_format |
openpolar |
spelling |
ftcdlib:oai:escholarship.org:ark:/13030/qt1n988123 2023-05-15T17:34:27+02:00 Very large release of mostly volcanic carbon during the Palaeocene-Eocene Thermal Maximum. Gutjahr, Marcus Ridgwell, Andy Sexton, Philip F Anagnostou, Eleni Pearson, Paul N Pälike, Heiko Norris, Richard D Thomas, Ellen Foster, Gavin L 573 - 577 2017-08-01 application/pdf https://escholarship.org/uc/item/1n988123 unknown eScholarship, University of California qt1n988123 https://escholarship.org/uc/item/1n988123 public Nature, vol 548, iss 7669 General Science & Technology article 2017 ftcdlib 2022-09-26T17:29:05Z The Palaeocene-Eocene Thermal Maximum (PETM) was a global warming event that occurred about 56 million years ago, and is commonly thought to have been driven primarily by the destabilization of carbon from surface sedimentary reservoirs such as methane hydrates. However, it remains controversial whether such reservoirs were indeed the source of the carbon that drove the warming. Resolving this issue is key to understanding the proximal cause of the warming, and to quantifying the roles of triggers versus feedbacks. Here we present boron isotope data-a proxy for seawater pH-that show that the ocean surface pH was persistently low during the PETM. We combine our pH data with a paired carbon isotope record in an Earth system model in order to reconstruct the unfolding carbon-cycle dynamics during the event. We find strong evidence for a much larger (more than 10,000 petagrams)-and, on average, isotopically heavier-carbon source than considered previously. This leads us to identify volcanism associated with the North Atlantic Igneous Province, rather than carbon from a surface reservoir, as the main driver of the PETM. This finding implies that climate-driven amplification of organic carbon feedbacks probably played only a minor part in driving the event. However, we find that enhanced burial of organic matter seems to have been important in eventually sequestering the released carbon and accelerating the recovery of the Earth system. Article in Journal/Newspaper North Atlantic University of California: eScholarship |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
General Science & Technology |
spellingShingle |
General Science & Technology Gutjahr, Marcus Ridgwell, Andy Sexton, Philip F Anagnostou, Eleni Pearson, Paul N Pälike, Heiko Norris, Richard D Thomas, Ellen Foster, Gavin L Very large release of mostly volcanic carbon during the Palaeocene-Eocene Thermal Maximum. |
topic_facet |
General Science & Technology |
description |
The Palaeocene-Eocene Thermal Maximum (PETM) was a global warming event that occurred about 56 million years ago, and is commonly thought to have been driven primarily by the destabilization of carbon from surface sedimentary reservoirs such as methane hydrates. However, it remains controversial whether such reservoirs were indeed the source of the carbon that drove the warming. Resolving this issue is key to understanding the proximal cause of the warming, and to quantifying the roles of triggers versus feedbacks. Here we present boron isotope data-a proxy for seawater pH-that show that the ocean surface pH was persistently low during the PETM. We combine our pH data with a paired carbon isotope record in an Earth system model in order to reconstruct the unfolding carbon-cycle dynamics during the event. We find strong evidence for a much larger (more than 10,000 petagrams)-and, on average, isotopically heavier-carbon source than considered previously. This leads us to identify volcanism associated with the North Atlantic Igneous Province, rather than carbon from a surface reservoir, as the main driver of the PETM. This finding implies that climate-driven amplification of organic carbon feedbacks probably played only a minor part in driving the event. However, we find that enhanced burial of organic matter seems to have been important in eventually sequestering the released carbon and accelerating the recovery of the Earth system. |
format |
Article in Journal/Newspaper |
author |
Gutjahr, Marcus Ridgwell, Andy Sexton, Philip F Anagnostou, Eleni Pearson, Paul N Pälike, Heiko Norris, Richard D Thomas, Ellen Foster, Gavin L |
author_facet |
Gutjahr, Marcus Ridgwell, Andy Sexton, Philip F Anagnostou, Eleni Pearson, Paul N Pälike, Heiko Norris, Richard D Thomas, Ellen Foster, Gavin L |
author_sort |
Gutjahr, Marcus |
title |
Very large release of mostly volcanic carbon during the Palaeocene-Eocene Thermal Maximum. |
title_short |
Very large release of mostly volcanic carbon during the Palaeocene-Eocene Thermal Maximum. |
title_full |
Very large release of mostly volcanic carbon during the Palaeocene-Eocene Thermal Maximum. |
title_fullStr |
Very large release of mostly volcanic carbon during the Palaeocene-Eocene Thermal Maximum. |
title_full_unstemmed |
Very large release of mostly volcanic carbon during the Palaeocene-Eocene Thermal Maximum. |
title_sort |
very large release of mostly volcanic carbon during the palaeocene-eocene thermal maximum. |
publisher |
eScholarship, University of California |
publishDate |
2017 |
url |
https://escholarship.org/uc/item/1n988123 |
op_coverage |
573 - 577 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Nature, vol 548, iss 7669 |
op_relation |
qt1n988123 https://escholarship.org/uc/item/1n988123 |
op_rights |
public |
_version_ |
1766133292394872832 |