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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ftoceanrep:oai:oceanrep.geomar.de:47180 2023-05-15T13:38:52+02:00 Late Eocene onset of the Proto-Antarctic Circumpolar Current Sarkar, Sudipta Basak, Chandranath Frank, Martin Berndt, Christian Huuse, Mads Badhani, Shray Bialas, Jörg 2019-07-12 text https://oceanrep.geomar.de/id/eprint/47180/ https://oceanrep.geomar.de/id/eprint/47180/1/s41598-019-46253-1.pdf https://oceanrep.geomar.de/id/eprint/47180/2/41598_2019_46253_MOESM1_ESM.doc https://doi.org/10.1038/s41598-019-46253-1 en eng Nature Research https://oceanrep.geomar.de/id/eprint/47180/1/s41598-019-46253-1.pdf https://oceanrep.geomar.de/id/eprint/47180/2/41598_2019_46253_MOESM1_ESM.doc Sarkar, S. , Basak, C., Frank, M. , Berndt, C. , Huuse, M. , Badhani, S. and Bialas, J. (2019) Late Eocene onset of the Proto-Antarctic Circumpolar Current. Open Access Scientific Reports, 9 (Article number: 10125). DOI 10.1038/s41598-019-46253-1 <https://doi.org/10.1038/s41598-019-46253-1>. doi:10.1038/s41598-019-46253-1 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2019 ftoceanrep https://doi.org/10.1038/s41598-019-46253-1 2023-04-07T15:46:36Z 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 OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic New Zealand Pacific The Antarctic Scientific Reports 9 1 |
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Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
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, Jörg |
spellingShingle |
Sarkar, Sudipta Basak, Chandranath Frank, Martin Berndt, Christian Huuse, Mads Badhani, Shray Bialas, Jörg Late Eocene onset of the Proto-Antarctic Circumpolar Current |
author_facet |
Sarkar, Sudipta Basak, Chandranath Frank, Martin Berndt, Christian Huuse, Mads Badhani, Shray Bialas, Jörg |
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 Research |
publishDate |
2019 |
url |
https://oceanrep.geomar.de/id/eprint/47180/ https://oceanrep.geomar.de/id/eprint/47180/1/s41598-019-46253-1.pdf https://oceanrep.geomar.de/id/eprint/47180/2/41598_2019_46253_MOESM1_ESM.doc 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 |
https://oceanrep.geomar.de/id/eprint/47180/1/s41598-019-46253-1.pdf https://oceanrep.geomar.de/id/eprint/47180/2/41598_2019_46253_MOESM1_ESM.doc Sarkar, S. , Basak, C., Frank, M. , Berndt, C. , Huuse, M. , Badhani, S. and Bialas, J. (2019) Late Eocene onset of the Proto-Antarctic Circumpolar Current. Open Access Scientific Reports, 9 (Article number: 10125). DOI 10.1038/s41598-019-46253-1 <https://doi.org/10.1038/s41598-019-46253-1>. doi:10.1038/s41598-019-46253-1 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1038/s41598-019-46253-1 |
container_title |
Scientific Reports |
container_volume |
9 |
container_issue |
1 |
_version_ |
1766111795107332096 |