Ice core evidence for atmospheric oxygen decline since the Mid-Pleistocene transition
The history of atmospheric oxygen (PO(2)) and the processes that act to regulate it remain enigmatic because of difficulties in quantitative reconstructions using indirect proxies. Here, we extend the ice-core record of PO(2) using 1.5-million-year-old (Ma) discontinuous ice samples drilled from All...
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ftpubmed:oai:pubmedcentral.nih.gov:8673763 2023-05-15T13:41:36+02:00 Ice core evidence for atmospheric oxygen decline since the Mid-Pleistocene transition Yan, Yuzhen Brook, Edward J. Kurbatov, Andrei V. Severinghaus, Jeffrey P. Higgins, John A. 2021-12-15 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8673763/ http://www.ncbi.nlm.nih.gov/pubmed/34910502 https://doi.org/10.1126/sciadv.abj9341 en eng American Association for the Advancement of Science http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8673763/ http://www.ncbi.nlm.nih.gov/pubmed/34910502 http://dx.doi.org/10.1126/sciadv.abj9341 Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. CC-BY Sci Adv Earth Environmental Ecological and Space Sciences Text 2021 ftpubmed https://doi.org/10.1126/sciadv.abj9341 2022-01-02T01:29:15Z The history of atmospheric oxygen (PO(2)) and the processes that act to regulate it remain enigmatic because of difficulties in quantitative reconstructions using indirect proxies. Here, we extend the ice-core record of PO(2) using 1.5-million-year-old (Ma) discontinuous ice samples drilled from Allan Hills Blue Ice Area, East Antarctica. No statistically significant difference exists in PO(2) between samples at 1.5 Ma and 810 thousand years (ka), suggesting that the Late-Pleistocene imbalance in O(2) sources and sinks began around the time of the transition from 40- to 100-ka glacial cycles in the Mid-Pleistocene between ~1.2 Ma and 700 ka. The absence of a coeval secular increase in atmospheric CO(2) over the past ~1 Ma requires negative feedback mechanisms such as Pco(2)-dependent silicate weathering. Fast processes must also act to suppress the immediate Pco(2) increase because of the imbalance in O(2) sinks over sources beginning in the Mid-Pleistocene. Text Antarc* Antarctica East Antarctica ice core PubMed Central (PMC) Allan Hills ENVELOPE(159.667,159.667,-76.717,-76.717) East Antarctica Science Advances 7 51 |
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Open Polar |
collection |
PubMed Central (PMC) |
op_collection_id |
ftpubmed |
language |
English |
topic |
Earth Environmental Ecological and Space Sciences |
spellingShingle |
Earth Environmental Ecological and Space Sciences Yan, Yuzhen Brook, Edward J. Kurbatov, Andrei V. Severinghaus, Jeffrey P. Higgins, John A. Ice core evidence for atmospheric oxygen decline since the Mid-Pleistocene transition |
topic_facet |
Earth Environmental Ecological and Space Sciences |
description |
The history of atmospheric oxygen (PO(2)) and the processes that act to regulate it remain enigmatic because of difficulties in quantitative reconstructions using indirect proxies. Here, we extend the ice-core record of PO(2) using 1.5-million-year-old (Ma) discontinuous ice samples drilled from Allan Hills Blue Ice Area, East Antarctica. No statistically significant difference exists in PO(2) between samples at 1.5 Ma and 810 thousand years (ka), suggesting that the Late-Pleistocene imbalance in O(2) sources and sinks began around the time of the transition from 40- to 100-ka glacial cycles in the Mid-Pleistocene between ~1.2 Ma and 700 ka. The absence of a coeval secular increase in atmospheric CO(2) over the past ~1 Ma requires negative feedback mechanisms such as Pco(2)-dependent silicate weathering. Fast processes must also act to suppress the immediate Pco(2) increase because of the imbalance in O(2) sinks over sources beginning in the Mid-Pleistocene. |
format |
Text |
author |
Yan, Yuzhen Brook, Edward J. Kurbatov, Andrei V. Severinghaus, Jeffrey P. Higgins, John A. |
author_facet |
Yan, Yuzhen Brook, Edward J. Kurbatov, Andrei V. Severinghaus, Jeffrey P. Higgins, John A. |
author_sort |
Yan, Yuzhen |
title |
Ice core evidence for atmospheric oxygen decline since the Mid-Pleistocene transition |
title_short |
Ice core evidence for atmospheric oxygen decline since the Mid-Pleistocene transition |
title_full |
Ice core evidence for atmospheric oxygen decline since the Mid-Pleistocene transition |
title_fullStr |
Ice core evidence for atmospheric oxygen decline since the Mid-Pleistocene transition |
title_full_unstemmed |
Ice core evidence for atmospheric oxygen decline since the Mid-Pleistocene transition |
title_sort |
ice core evidence for atmospheric oxygen decline since the mid-pleistocene transition |
publisher |
American Association for the Advancement of Science |
publishDate |
2021 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8673763/ http://www.ncbi.nlm.nih.gov/pubmed/34910502 https://doi.org/10.1126/sciadv.abj9341 |
long_lat |
ENVELOPE(159.667,159.667,-76.717,-76.717) |
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Allan Hills East Antarctica |
geographic_facet |
Allan Hills East Antarctica |
genre |
Antarc* Antarctica East Antarctica ice core |
genre_facet |
Antarc* Antarctica East Antarctica ice core |
op_source |
Sci Adv |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8673763/ http://www.ncbi.nlm.nih.gov/pubmed/34910502 http://dx.doi.org/10.1126/sciadv.abj9341 |
op_rights |
Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
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CC-BY |
op_doi |
https://doi.org/10.1126/sciadv.abj9341 |
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Science Advances |
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7 |
container_issue |
51 |
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