Southern Ocean biogenic blooms freezing-in Oligocene colder climates
Crossing a key atmospheric CO2 threshold triggered a fundamental global climate reorganisation ~34 million years ago (Ma) establishing permanent Antarctic ice sheets. Curiously, a more dramatic CO2 decline (~800–400 ppm by the Early Oligocene(~27 Ma)), postdates initial ice sheet expansion but the m...
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ftoslouniv:oai:www.duo.uio.no:10852/100970 2023-05-15T13:38:06+02:00 Southern Ocean biogenic blooms freezing-in Oligocene colder climates ENEngelskEnglishSouthern Ocean biogenic blooms freezing-in Oligocene colder climates Hochmuth, Katharina Whittaker, Joanne M. Sauermilch, Isabel Klocker, Andreas Gohl, Karsten LaCasce, Joseph H. 2022-11-18T10:38:12Z http://hdl.handle.net/10852/100970 https://doi.org/10.1038/s41467-022-34623-9 EN eng Nature Portfolio DFG/GO724/15-1 and GO724/−2 OTHER/Australian Research Council DP1 OTHER/Australian Research Council SR140300001 Hochmuth, Katharina Whittaker, Joanne M. Sauermilch, Isabel Klocker, Andreas Gohl, Karsten LaCasce, Joseph H. . Southern Ocean biogenic blooms freezing-in Oligocene colder climates. Nature Communications. 2022, 13 http://hdl.handle.net/10852/100970 2076171 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Nature Communications&rft.volume=13&rft.spage=&rft.date=2022 Nature Communications 13 1 10 https://doi.org/10.1038/s41467-022-34623-9 Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ CC-BY 2041-1723 VDP::Geofag: 450 Journal article Tidsskriftartikkel Peer reviewed PublishedVersion 2022 ftoslouniv https://doi.org/10.1038/s41467-022-34623-9 2023-03-08T23:36:47Z Crossing a key atmospheric CO2 threshold triggered a fundamental global climate reorganisation ~34 million years ago (Ma) establishing permanent Antarctic ice sheets. Curiously, a more dramatic CO2 decline (~800–400 ppm by the Early Oligocene(~27 Ma)), postdates initial ice sheet expansion but the mechanisms driving this later, rapid drop in atmospheric carbon during the early Oligocene remains elusive and controversial. Here we use marine seismic reflection and borehole data to reveal an unprecedented accumulation of early Oligocene strata (up to 2.2 km thick over 1500 × 500 km) with a major biogenic component in the Australian Southern Ocean. High-resolution ocean simulations demonstrate that a tectonically-driven, one-off reorganisation of ocean currents, caused a unique period where current instability coincided with high nutrient input from the Antarctic continent. This unrepeated and short-lived environment favoured extreme bioproductivity and enhanced sediment burial. The size and rapid accumulation of this sediment package potentially holds ~1.067 × 1015 kg of the ‘missing carbon’ sequestered during the decline from an Eocene high CO2-world to a mid-Oligocene medium CO2-world, highlighting the exceptional role of the Southern Ocean in modulating long-term climate. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Southern Ocean Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Antarctic Southern Ocean The Antarctic Nature Communications 13 1 |
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Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
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ftoslouniv |
language |
English |
topic |
VDP::Geofag: 450 |
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VDP::Geofag: 450 Hochmuth, Katharina Whittaker, Joanne M. Sauermilch, Isabel Klocker, Andreas Gohl, Karsten LaCasce, Joseph H. Southern Ocean biogenic blooms freezing-in Oligocene colder climates |
topic_facet |
VDP::Geofag: 450 |
description |
Crossing a key atmospheric CO2 threshold triggered a fundamental global climate reorganisation ~34 million years ago (Ma) establishing permanent Antarctic ice sheets. Curiously, a more dramatic CO2 decline (~800–400 ppm by the Early Oligocene(~27 Ma)), postdates initial ice sheet expansion but the mechanisms driving this later, rapid drop in atmospheric carbon during the early Oligocene remains elusive and controversial. Here we use marine seismic reflection and borehole data to reveal an unprecedented accumulation of early Oligocene strata (up to 2.2 km thick over 1500 × 500 km) with a major biogenic component in the Australian Southern Ocean. High-resolution ocean simulations demonstrate that a tectonically-driven, one-off reorganisation of ocean currents, caused a unique period where current instability coincided with high nutrient input from the Antarctic continent. This unrepeated and short-lived environment favoured extreme bioproductivity and enhanced sediment burial. The size and rapid accumulation of this sediment package potentially holds ~1.067 × 1015 kg of the ‘missing carbon’ sequestered during the decline from an Eocene high CO2-world to a mid-Oligocene medium CO2-world, highlighting the exceptional role of the Southern Ocean in modulating long-term climate. |
format |
Article in Journal/Newspaper |
author |
Hochmuth, Katharina Whittaker, Joanne M. Sauermilch, Isabel Klocker, Andreas Gohl, Karsten LaCasce, Joseph H. |
author_facet |
Hochmuth, Katharina Whittaker, Joanne M. Sauermilch, Isabel Klocker, Andreas Gohl, Karsten LaCasce, Joseph H. |
author_sort |
Hochmuth, Katharina |
title |
Southern Ocean biogenic blooms freezing-in Oligocene colder climates |
title_short |
Southern Ocean biogenic blooms freezing-in Oligocene colder climates |
title_full |
Southern Ocean biogenic blooms freezing-in Oligocene colder climates |
title_fullStr |
Southern Ocean biogenic blooms freezing-in Oligocene colder climates |
title_full_unstemmed |
Southern Ocean biogenic blooms freezing-in Oligocene colder climates |
title_sort |
southern ocean biogenic blooms freezing-in oligocene colder climates |
publisher |
Nature Portfolio |
publishDate |
2022 |
url |
http://hdl.handle.net/10852/100970 https://doi.org/10.1038/s41467-022-34623-9 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Ice Sheet Southern Ocean |
genre_facet |
Antarc* Antarctic Ice Sheet Southern Ocean |
op_source |
2041-1723 |
op_relation |
DFG/GO724/15-1 and GO724/−2 OTHER/Australian Research Council DP1 OTHER/Australian Research Council SR140300001 Hochmuth, Katharina Whittaker, Joanne M. Sauermilch, Isabel Klocker, Andreas Gohl, Karsten LaCasce, Joseph H. . Southern Ocean biogenic blooms freezing-in Oligocene colder climates. Nature Communications. 2022, 13 http://hdl.handle.net/10852/100970 2076171 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Nature Communications&rft.volume=13&rft.spage=&rft.date=2022 Nature Communications 13 1 10 https://doi.org/10.1038/s41467-022-34623-9 |
op_rights |
Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/s41467-022-34623-9 |
container_title |
Nature Communications |
container_volume |
13 |
container_issue |
1 |
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1766101541599576064 |