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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Published in:Scientific Reports
Main Authors: Sarkar, Sudipta, Basak, Chandranath, Frank, Martin, Berndt, Christian, Huuse, Mads, Badhani, Shray, Bialas, Joerg
Format: Article in Journal/Newspaper
Language:English
Published: Springer Science and Business Media LLC 2019
Subjects:
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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spelling 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
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