Late Eocene onset of the Proto-Antarctic Circumpolar Current
The formation of the Antarctic Circumpolar Current (ACC) is critical for the evolution of the global climate, but the timing of its onset is not well constrained. Here, we present new seismic evidence of widespread Late Eocene to Oligocene marine diagenetic chert in sedimentary drift deposits east o...
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ftpubmed:oai:pubmedcentral.nih.gov:6626031 2023-05-15T13:54:15+02:00 Late Eocene onset of the Proto-Antarctic Circumpolar Current Sarkar, Sudipta Basak, Chandranath Frank, Martin Berndt, Christian Huuse, Mads Badhani, Shray Bialas, Joerg 2019-07-12 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6626031/ http://www.ncbi.nlm.nih.gov/pubmed/31300669 https://doi.org/10.1038/s41598-019-46253-1 en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6626031/ http://www.ncbi.nlm.nih.gov/pubmed/31300669 http://dx.doi.org/10.1038/s41598-019-46253-1 © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. CC-BY Article Text 2019 ftpubmed https://doi.org/10.1038/s41598-019-46253-1 2019-08-04T00:37:23Z The formation of the Antarctic Circumpolar Current (ACC) is critical for the evolution of the global climate, but the timing of its onset is not well constrained. Here, we present new seismic evidence of widespread Late Eocene to Oligocene marine diagenetic chert in sedimentary drift deposits east of New Zealand indicating prolonged periods of blooms of siliceous microorganisms starting ~36 million years ago (Ma). These major blooms reflect the initiation of the arrival and upwelling of northern-sourced, nutrient-rich deep equatorial Pacific waters at the high latitudes of the South Pacific. We show that this change in circulation was linked to the initiation of a proto-ACC, which occurred ~6 Ma earlier than the currently estimated onset of the ACC at 30 Ma. We propose that the associated increased primary productivity and carbon burial facilitated atmospheric carbon dioxide reduction contributing to the expansion of Antarctic Ice Sheet at the Eocene-Oligocene Transition. Text Antarc* Antarctic Ice Sheet PubMed Central (PMC) Antarctic New Zealand Pacific The Antarctic Scientific Reports 9 1 |
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Article Sarkar, Sudipta Basak, Chandranath Frank, Martin Berndt, Christian Huuse, Mads Badhani, Shray Bialas, Joerg Late Eocene onset of the Proto-Antarctic Circumpolar Current |
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Article |
description |
The formation of the Antarctic Circumpolar Current (ACC) is critical for the evolution of the global climate, but the timing of its onset is not well constrained. Here, we present new seismic evidence of widespread Late Eocene to Oligocene marine diagenetic chert in sedimentary drift deposits east of New Zealand indicating prolonged periods of blooms of siliceous microorganisms starting ~36 million years ago (Ma). These major blooms reflect the initiation of the arrival and upwelling of northern-sourced, nutrient-rich deep equatorial Pacific waters at the high latitudes of the South Pacific. We show that this change in circulation was linked to the initiation of a proto-ACC, which occurred ~6 Ma earlier than the currently estimated onset of the ACC at 30 Ma. We propose that the associated increased primary productivity and carbon burial facilitated atmospheric carbon dioxide reduction contributing to the expansion of Antarctic Ice Sheet at the Eocene-Oligocene Transition. |
format |
Text |
author |
Sarkar, Sudipta Basak, Chandranath Frank, Martin Berndt, Christian Huuse, Mads Badhani, Shray Bialas, Joerg |
author_facet |
Sarkar, Sudipta Basak, Chandranath Frank, Martin Berndt, Christian Huuse, Mads Badhani, Shray Bialas, Joerg |
author_sort |
Sarkar, Sudipta |
title |
Late Eocene onset of the Proto-Antarctic Circumpolar Current |
title_short |
Late Eocene onset of the Proto-Antarctic Circumpolar Current |
title_full |
Late Eocene onset of the Proto-Antarctic Circumpolar Current |
title_fullStr |
Late Eocene onset of the Proto-Antarctic Circumpolar Current |
title_full_unstemmed |
Late Eocene onset of the Proto-Antarctic Circumpolar Current |
title_sort |
late eocene onset of the proto-antarctic circumpolar current |
publisher |
Nature Publishing Group UK |
publishDate |
2019 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6626031/ http://www.ncbi.nlm.nih.gov/pubmed/31300669 https://doi.org/10.1038/s41598-019-46253-1 |
geographic |
Antarctic New Zealand Pacific The Antarctic |
geographic_facet |
Antarctic New Zealand Pacific The Antarctic |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6626031/ http://www.ncbi.nlm.nih.gov/pubmed/31300669 http://dx.doi.org/10.1038/s41598-019-46253-1 |
op_rights |
© The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
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CC-BY |
op_doi |
https://doi.org/10.1038/s41598-019-46253-1 |
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Scientific Reports |
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9 |
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1 |
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