Rapid and sustained surface ocean acidification during the Paleocene-Eocene Thermal Maximum
The Paleocene-Eocene Thermal Maximum (PETM) has been associated with the release of several thousands of petagrams of carbon (Pg C) as methane and/or carbon dioxide into the ocean-atmosphere system within ~10 kyr, on the basis of the co-occurrence of a carbon isotope excursion (CIE), widespread diss...
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ftcolumbiauniv:oai:academiccommons.columbia.edu:10.7916/D8C53K9C 2023-05-15T17:50:33+02:00 Rapid and sustained surface ocean acidification during the Paleocene-Eocene Thermal Maximum Penman, Donald E. Hoenisch, Baerbel Zeebe, Richard E. Thomas, Ellen Zachos, James C. 2014 https://doi.org/10.7916/D8C53K9C English eng https://doi.org/10.7916/D8C53K9C Paleocene Geologic Epoch Carbon dioxide Ocean acidification Chemical oceanography Paleontology Articles 2014 ftcolumbiauniv https://doi.org/10.7916/D8C53K9C 2019-04-04T08:13:19Z The Paleocene-Eocene Thermal Maximum (PETM) has been associated with the release of several thousands of petagrams of carbon (Pg C) as methane and/or carbon dioxide into the ocean-atmosphere system within ~10 kyr, on the basis of the co-occurrence of a carbon isotope excursion (CIE), widespread dissolution of deep sea carbonates, and global warming. In theory, this rapid carbon release should have severely acidified the surface ocean, though no geochemical evidence has yet been presented. Using boron-based proxies for surface ocean carbonate chemistry, we present the first observational evidence for a drop in the pH of surface and thermocline seawater during the PETM. Planktic foraminifers from a drill site in the North Pacific (Ocean Drilling Program Site 1209) show a ~0.8‰ decrease in boron isotopic composition (δ11B) at the onset of the event, along with a 30–40% reduction in shell B/Ca. Similar trends in δ11B are present in two lower-resolution records from the South Atlantic and Equatorial Pacific. These observations are consistent with significant, global acidification of the surface ocean lasting at least 70 kyr and requiring sustained carbon release. The anomalies in the B records are consistent with an initial surface pH drop of ~0.3 units, at the upper range of model-based estimates of acidification. Article in Journal/Newspaper Ocean acidification Columbia University: Academic Commons Pacific |
institution |
Open Polar |
collection |
Columbia University: Academic Commons |
op_collection_id |
ftcolumbiauniv |
language |
English |
topic |
Paleocene Geologic Epoch Carbon dioxide Ocean acidification Chemical oceanography Paleontology |
spellingShingle |
Paleocene Geologic Epoch Carbon dioxide Ocean acidification Chemical oceanography Paleontology Penman, Donald E. Hoenisch, Baerbel Zeebe, Richard E. Thomas, Ellen Zachos, James C. Rapid and sustained surface ocean acidification during the Paleocene-Eocene Thermal Maximum |
topic_facet |
Paleocene Geologic Epoch Carbon dioxide Ocean acidification Chemical oceanography Paleontology |
description |
The Paleocene-Eocene Thermal Maximum (PETM) has been associated with the release of several thousands of petagrams of carbon (Pg C) as methane and/or carbon dioxide into the ocean-atmosphere system within ~10 kyr, on the basis of the co-occurrence of a carbon isotope excursion (CIE), widespread dissolution of deep sea carbonates, and global warming. In theory, this rapid carbon release should have severely acidified the surface ocean, though no geochemical evidence has yet been presented. Using boron-based proxies for surface ocean carbonate chemistry, we present the first observational evidence for a drop in the pH of surface and thermocline seawater during the PETM. Planktic foraminifers from a drill site in the North Pacific (Ocean Drilling Program Site 1209) show a ~0.8‰ decrease in boron isotopic composition (δ11B) at the onset of the event, along with a 30–40% reduction in shell B/Ca. Similar trends in δ11B are present in two lower-resolution records from the South Atlantic and Equatorial Pacific. These observations are consistent with significant, global acidification of the surface ocean lasting at least 70 kyr and requiring sustained carbon release. The anomalies in the B records are consistent with an initial surface pH drop of ~0.3 units, at the upper range of model-based estimates of acidification. |
format |
Article in Journal/Newspaper |
author |
Penman, Donald E. Hoenisch, Baerbel Zeebe, Richard E. Thomas, Ellen Zachos, James C. |
author_facet |
Penman, Donald E. Hoenisch, Baerbel Zeebe, Richard E. Thomas, Ellen Zachos, James C. |
author_sort |
Penman, Donald E. |
title |
Rapid and sustained surface ocean acidification during the Paleocene-Eocene Thermal Maximum |
title_short |
Rapid and sustained surface ocean acidification during the Paleocene-Eocene Thermal Maximum |
title_full |
Rapid and sustained surface ocean acidification during the Paleocene-Eocene Thermal Maximum |
title_fullStr |
Rapid and sustained surface ocean acidification during the Paleocene-Eocene Thermal Maximum |
title_full_unstemmed |
Rapid and sustained surface ocean acidification during the Paleocene-Eocene Thermal Maximum |
title_sort |
rapid and sustained surface ocean acidification during the paleocene-eocene thermal maximum |
publishDate |
2014 |
url |
https://doi.org/10.7916/D8C53K9C |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
https://doi.org/10.7916/D8C53K9C |
op_doi |
https://doi.org/10.7916/D8C53K9C |
_version_ |
1766157358093828096 |