Changes in North Atlantic deep-water oxygenation across the Middle Pleistocene Transition
The oxygen concentrations of oceanic deep-water and atmospheric carbon dioxide ( p CO 2 ) are intrinsically linked through organic carbon remineralization and storage as dissolved inorganic carbon in the deep sea. We present a high-resolution reconstruction of relative changes in oxygen concentratio...
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American Association for the Advancement of Science (AAAS)
2022
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Online Access: | http://dx.doi.org/10.1126/science.abj7761 https://www.science.org/doi/pdf/10.1126/science.abj7761 |
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craaas:10.1126/science.abj7761 2024-09-09T19:54:18+00:00 Changes in North Atlantic deep-water oxygenation across the Middle Pleistocene Transition Thomas, Nicola C. Bradbury, Harold J. Hodell, David A. 2022 http://dx.doi.org/10.1126/science.abj7761 https://www.science.org/doi/pdf/10.1126/science.abj7761 en eng American Association for the Advancement of Science (AAAS) Science volume 377, issue 6606, page 654-659 ISSN 0036-8075 1095-9203 journal-article 2022 craaas https://doi.org/10.1126/science.abj7761 2024-08-22T04:01:05Z The oxygen concentrations of oceanic deep-water and atmospheric carbon dioxide ( p CO 2 ) are intrinsically linked through organic carbon remineralization and storage as dissolved inorganic carbon in the deep sea. We present a high-resolution reconstruction of relative changes in oxygen concentration in the deep North Atlantic for the past 1.5 million years using the carbon isotope gradient between epifaunal and infaunal benthic foraminifera species as a proxy for paleo-oxygen. We report a significant (>40 micromole per kilogram) reduction in glacial Atlantic deep-water oxygenation at ~960 thousand to 900 thousand years ago that coincided with increased continental ice volume and a major change in ocean thermohaline circulation. Paleo-oxygen results support a scenario of decreasing deep-water oxygen concentrations, increased respired carbon storage, and a reduction in glacial p CO 2 across the Middle Pleistocene Transition. Article in Journal/Newspaper North Atlantic Deep Water North Atlantic AAAS Resource Center (American Association for the Advancement of Science) Science 377 6606 654 659 |
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AAAS Resource Center (American Association for the Advancement of Science) |
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craaas |
language |
English |
description |
The oxygen concentrations of oceanic deep-water and atmospheric carbon dioxide ( p CO 2 ) are intrinsically linked through organic carbon remineralization and storage as dissolved inorganic carbon in the deep sea. We present a high-resolution reconstruction of relative changes in oxygen concentration in the deep North Atlantic for the past 1.5 million years using the carbon isotope gradient between epifaunal and infaunal benthic foraminifera species as a proxy for paleo-oxygen. We report a significant (>40 micromole per kilogram) reduction in glacial Atlantic deep-water oxygenation at ~960 thousand to 900 thousand years ago that coincided with increased continental ice volume and a major change in ocean thermohaline circulation. Paleo-oxygen results support a scenario of decreasing deep-water oxygen concentrations, increased respired carbon storage, and a reduction in glacial p CO 2 across the Middle Pleistocene Transition. |
format |
Article in Journal/Newspaper |
author |
Thomas, Nicola C. Bradbury, Harold J. Hodell, David A. |
spellingShingle |
Thomas, Nicola C. Bradbury, Harold J. Hodell, David A. Changes in North Atlantic deep-water oxygenation across the Middle Pleistocene Transition |
author_facet |
Thomas, Nicola C. Bradbury, Harold J. Hodell, David A. |
author_sort |
Thomas, Nicola C. |
title |
Changes in North Atlantic deep-water oxygenation across the Middle Pleistocene Transition |
title_short |
Changes in North Atlantic deep-water oxygenation across the Middle Pleistocene Transition |
title_full |
Changes in North Atlantic deep-water oxygenation across the Middle Pleistocene Transition |
title_fullStr |
Changes in North Atlantic deep-water oxygenation across the Middle Pleistocene Transition |
title_full_unstemmed |
Changes in North Atlantic deep-water oxygenation across the Middle Pleistocene Transition |
title_sort |
changes in north atlantic deep-water oxygenation across the middle pleistocene transition |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
2022 |
url |
http://dx.doi.org/10.1126/science.abj7761 https://www.science.org/doi/pdf/10.1126/science.abj7761 |
genre |
North Atlantic Deep Water North Atlantic |
genre_facet |
North Atlantic Deep Water North Atlantic |
op_source |
Science volume 377, issue 6606, page 654-659 ISSN 0036-8075 1095-9203 |
op_doi |
https://doi.org/10.1126/science.abj7761 |
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Science |
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377 |
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6606 |
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654 |
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659 |
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1809923712021954560 |