Southern Ocean biogenic blooms freezing-in Oligocene colder climates
<jats:title>Abstract</jats:title><jats:p>Crossing a key atmospheric CO<jats:sub>2</jats:sub> threshold triggered a fundamental global climate reorganisation ~34 million years ago (Ma) establishing permanent Antarctic ice sheets. Curiously, a more dramatic CO<jats:sub...
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Springer Nature
2022
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Online Access: | https://epic.awi.de/id/eprint/57557/ https://epic.awi.de/id/eprint/57557/1/Hochmuth-etal_Southern-Ocean-biogenic-blooms-freezing-in-Oligocene-colder-climates_NatureComms_2022.pdf https://hdl.handle.net/10013/epic.c0f08c8c-789c-4ffe-a1d5-600ac791e6f1 |
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ftawi:oai:epic.awi.de:57557 2024-09-15T17:47:29+00:00 Southern Ocean biogenic blooms freezing-in Oligocene colder climates Hochmuth, Katharina Whittaker, Joanne M Sauermilch, Isabel Klocker, Andreas Gohl, Karsten LaCasce, Joseph H 2022-11-09 application/pdf https://epic.awi.de/id/eprint/57557/ https://epic.awi.de/id/eprint/57557/1/Hochmuth-etal_Southern-Ocean-biogenic-blooms-freezing-in-Oligocene-colder-climates_NatureComms_2022.pdf https://hdl.handle.net/10013/epic.c0f08c8c-789c-4ffe-a1d5-600ac791e6f1 unknown Springer Nature https://epic.awi.de/id/eprint/57557/1/Hochmuth-etal_Southern-Ocean-biogenic-blooms-freezing-in-Oligocene-colder-climates_NatureComms_2022.pdf Hochmuth, K. , Whittaker, J. M. , Sauermilch, I. , Klocker, A. , Gohl, K. orcid:0000-0002-9558-2116 and LaCasce, J. H. (2022) Southern Ocean biogenic blooms freezing-in Oligocene colder climates , Nature Communications, 13 (1), pp. 1-10 . doi:10.1038/s41467-022-34623-9 <https://doi.org/10.1038/s41467-022-34623-9> , hdl:10013/epic.c0f08c8c-789c-4ffe-a1d5-600ac791e6f1 EPIC3Nature Communications, Springer Nature, 13(1), pp. 1-10, ISSN: 2041-1723 Article isiRev 2022 ftawi https://doi.org/10.1038/s41467-022-34623-9 2024-06-24T04:30:12Z <jats:title>Abstract</jats:title><jats:p>Crossing a key atmospheric CO<jats:sub>2</jats:sub> threshold triggered a fundamental global climate reorganisation ~34 million years ago (Ma) establishing permanent Antarctic ice sheets. Curiously, a more dramatic CO<jats:sub>2</jats:sub> 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 × 10<jats:sup>15</jats:sup> kg of the ‘missing carbon’ sequestered during the decline from an Eocene high CO<jats:sub>2</jats:sub>-world to a mid-Oligocene medium CO<jats:sub>2</jats:sub>-world, highlighting the exceptional role of the Southern Ocean in modulating long-term climate.</jats:p> Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Nature Communications 13 1 |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
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description |
<jats:title>Abstract</jats:title><jats:p>Crossing a key atmospheric CO<jats:sub>2</jats:sub> threshold triggered a fundamental global climate reorganisation ~34 million years ago (Ma) establishing permanent Antarctic ice sheets. Curiously, a more dramatic CO<jats:sub>2</jats:sub> 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 × 10<jats:sup>15</jats:sup> kg of the ‘missing carbon’ sequestered during the decline from an Eocene high CO<jats:sub>2</jats:sub>-world to a mid-Oligocene medium CO<jats:sub>2</jats:sub>-world, highlighting the exceptional role of the Southern Ocean in modulating long-term climate.</jats:p> |
format |
Article in Journal/Newspaper |
author |
Hochmuth, Katharina Whittaker, Joanne M Sauermilch, Isabel Klocker, Andreas Gohl, Karsten LaCasce, Joseph H |
spellingShingle |
Hochmuth, Katharina Whittaker, Joanne M Sauermilch, Isabel Klocker, Andreas Gohl, Karsten LaCasce, Joseph H Southern Ocean biogenic blooms freezing-in Oligocene colder climates |
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 |
Springer Nature |
publishDate |
2022 |
url |
https://epic.awi.de/id/eprint/57557/ https://epic.awi.de/id/eprint/57557/1/Hochmuth-etal_Southern-Ocean-biogenic-blooms-freezing-in-Oligocene-colder-climates_NatureComms_2022.pdf https://hdl.handle.net/10013/epic.c0f08c8c-789c-4ffe-a1d5-600ac791e6f1 |
genre |
Antarc* Antarctic Ice Sheet Southern Ocean |
genre_facet |
Antarc* Antarctic Ice Sheet Southern Ocean |
op_source |
EPIC3Nature Communications, Springer Nature, 13(1), pp. 1-10, ISSN: 2041-1723 |
op_relation |
https://epic.awi.de/id/eprint/57557/1/Hochmuth-etal_Southern-Ocean-biogenic-blooms-freezing-in-Oligocene-colder-climates_NatureComms_2022.pdf Hochmuth, K. , Whittaker, J. M. , Sauermilch, I. , Klocker, A. , Gohl, K. orcid:0000-0002-9558-2116 and LaCasce, J. H. (2022) Southern Ocean biogenic blooms freezing-in Oligocene colder climates , Nature Communications, 13 (1), pp. 1-10 . doi:10.1038/s41467-022-34623-9 <https://doi.org/10.1038/s41467-022-34623-9> , hdl:10013/epic.c0f08c8c-789c-4ffe-a1d5-600ac791e6f1 |
op_doi |
https://doi.org/10.1038/s41467-022-34623-9 |
container_title |
Nature Communications |
container_volume |
13 |
container_issue |
1 |
_version_ |
1810496848089055232 |