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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Springer Science and Business Media LLC
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Online Access: | https://archimer.ifremer.fr/doc/00506/61778/65775.pdf https://archimer.ifremer.fr/doc/00506/61778/65777.pdf https://doi.org/10.1038/s41598-019-46253-1 https://archimer.ifremer.fr/doc/00506/61778/ |
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ftarchimer:oai:archimer.ifremer.fr:61778 2023-05-15T13:47:36+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 application/pdf https://archimer.ifremer.fr/doc/00506/61778/65775.pdf https://archimer.ifremer.fr/doc/00506/61778/65777.pdf https://doi.org/10.1038/s41598-019-46253-1 https://archimer.ifremer.fr/doc/00506/61778/ eng eng Springer Science and Business Media LLC https://archimer.ifremer.fr/doc/00506/61778/65775.pdf https://archimer.ifremer.fr/doc/00506/61778/65777.pdf doi:10.1038/s41598-019-46253-1 https://archimer.ifremer.fr/doc/00506/61778/ info:eu-repo/semantics/openAccess restricted use Scientific Reports (2045-2322) (Springer Science and Business Media LLC), 2019-07 , Vol. 9 , N. 1 , P. 10125 (10p.) text Publication info:eu-repo/semantics/article 2019 ftarchimer https://doi.org/10.1038/s41598-019-46253-1 2021-09-23T20:33:09Z 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. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic New Zealand Pacific The Antarctic Scientific Reports 9 1 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
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 |
Article in Journal/Newspaper |
author |
Sarkar, Sudipta Basak, Chandranath Frank, Martin Berndt, Christian Huuse, Mads Badhani, Shray Bialas, Joerg |
spellingShingle |
Sarkar, Sudipta Basak, Chandranath Frank, Martin Berndt, Christian Huuse, Mads Badhani, Shray Bialas, Joerg Late Eocene onset of the Proto-Antarctic Circumpolar Current |
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 |
Springer Science and Business Media LLC |
publishDate |
2019 |
url |
https://archimer.ifremer.fr/doc/00506/61778/65775.pdf https://archimer.ifremer.fr/doc/00506/61778/65777.pdf https://doi.org/10.1038/s41598-019-46253-1 https://archimer.ifremer.fr/doc/00506/61778/ |
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_source |
Scientific Reports (2045-2322) (Springer Science and Business Media LLC), 2019-07 , Vol. 9 , N. 1 , P. 10125 (10p.) |
op_relation |
https://archimer.ifremer.fr/doc/00506/61778/65775.pdf https://archimer.ifremer.fr/doc/00506/61778/65777.pdf doi:10.1038/s41598-019-46253-1 https://archimer.ifremer.fr/doc/00506/61778/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1038/s41598-019-46253-1 |
container_title |
Scientific Reports |
container_volume |
9 |
container_issue |
1 |
_version_ |
1766247512146968576 |