Oxygenated deep waters fed early Atlantic overturning circulation upon Antarctic glaciation
The Atlantic meridional overturning circulation (AMOC) exerts a major control on the global distribution of heat, dissolved oxygen and carbon in the ocean. Yet the timing and cause of the inception of this system and its evolution since the start of the Cenozoic Era 65 million years ago (Ma) remain...
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Online Access: | https://eprints.soton.ac.uk/483626/ https://eprints.soton.ac.uk/483626/1/Wang_etal_2023_Pure.pdf |
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ftsouthampton:oai:eprints.soton.ac.uk:483626 2024-05-19T07:30:10+00:00 Oxygenated deep waters fed early Atlantic overturning circulation upon Antarctic glaciation Wang, Huanye Liu, Weiguo Zhang, Yancheng Liang, Yu He, Yuxin Bohaty, Steven M. Wilson, Paul A. Liu, Zhonghui 2023-11 text https://eprints.soton.ac.uk/483626/ https://eprints.soton.ac.uk/483626/1/Wang_etal_2023_Pure.pdf en English eng https://eprints.soton.ac.uk/483626/1/Wang_etal_2023_Pure.pdf Wang, Huanye, Liu, Weiguo, Zhang, Yancheng, Liang, Yu, He, Yuxin, Bohaty, Steven M., Wilson, Paul A. and Liu, Zhonghui (2023) Oxygenated deep waters fed early Atlantic overturning circulation upon Antarctic glaciation. Nature Geoscience, 16 (11), 1014-1019. (doi:10.1038/s41561-023-01292-2 <http://dx.doi.org/10.1038/s41561-023-01292-2>). Article PeerReviewed 2023 ftsouthampton https://doi.org/10.1038/s41561-023-01292-2 2024-04-23T23:33:49Z The Atlantic meridional overturning circulation (AMOC) exerts a major control on the global distribution of heat, dissolved oxygen and carbon in the ocean. Yet the timing and cause of the inception of this system and its evolution since the start of the Cenozoic Era 65 million years ago (Ma) remain highly uncertain. Here we present records of microbial source indicators based on glycerol dialkyl glycerol tetraether distributions from the Cenozoic Northwest Atlantic Ocean (~43‒18 Ma) and use them to infer changes in AMOC-driven deep-ocean oxygenation. At this location, oxygenation is strongly controlled by southwestward Deep Western Boundary Current transport of newly formed deep waters that feed AMOC. Our Eocene data show short-term high-amplitude variability and an overall decrease in oxygenation of AMOC-feed waters culminating in especially poor ventilation between ~36.5 and ~34 Ma. AMOC-feed waters became better oxygenated upon initiation of Antarctic glaciation at the Eocene/Oligocene transition, ~34 Ma, and were consistently well ventilated from ~30 Ma. Our findings indicate a close association between the inception of Antarctic glaciation and AMOC and suggest that both vertical mixing and wind-driven upwelling in the Southern Ocean were key to fully establishing AMOC as an agent of deep-ocean ventilation. Article in Journal/Newspaper Antarc* Antarctic Northwest Atlantic Southern Ocean University of Southampton: e-Prints Soton Nature Geoscience 16 11 1014 1019 |
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University of Southampton: e-Prints Soton |
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English |
description |
The Atlantic meridional overturning circulation (AMOC) exerts a major control on the global distribution of heat, dissolved oxygen and carbon in the ocean. Yet the timing and cause of the inception of this system and its evolution since the start of the Cenozoic Era 65 million years ago (Ma) remain highly uncertain. Here we present records of microbial source indicators based on glycerol dialkyl glycerol tetraether distributions from the Cenozoic Northwest Atlantic Ocean (~43‒18 Ma) and use them to infer changes in AMOC-driven deep-ocean oxygenation. At this location, oxygenation is strongly controlled by southwestward Deep Western Boundary Current transport of newly formed deep waters that feed AMOC. Our Eocene data show short-term high-amplitude variability and an overall decrease in oxygenation of AMOC-feed waters culminating in especially poor ventilation between ~36.5 and ~34 Ma. AMOC-feed waters became better oxygenated upon initiation of Antarctic glaciation at the Eocene/Oligocene transition, ~34 Ma, and were consistently well ventilated from ~30 Ma. Our findings indicate a close association between the inception of Antarctic glaciation and AMOC and suggest that both vertical mixing and wind-driven upwelling in the Southern Ocean were key to fully establishing AMOC as an agent of deep-ocean ventilation. |
format |
Article in Journal/Newspaper |
author |
Wang, Huanye Liu, Weiguo Zhang, Yancheng Liang, Yu He, Yuxin Bohaty, Steven M. Wilson, Paul A. Liu, Zhonghui |
spellingShingle |
Wang, Huanye Liu, Weiguo Zhang, Yancheng Liang, Yu He, Yuxin Bohaty, Steven M. Wilson, Paul A. Liu, Zhonghui Oxygenated deep waters fed early Atlantic overturning circulation upon Antarctic glaciation |
author_facet |
Wang, Huanye Liu, Weiguo Zhang, Yancheng Liang, Yu He, Yuxin Bohaty, Steven M. Wilson, Paul A. Liu, Zhonghui |
author_sort |
Wang, Huanye |
title |
Oxygenated deep waters fed early Atlantic overturning circulation upon Antarctic glaciation |
title_short |
Oxygenated deep waters fed early Atlantic overturning circulation upon Antarctic glaciation |
title_full |
Oxygenated deep waters fed early Atlantic overturning circulation upon Antarctic glaciation |
title_fullStr |
Oxygenated deep waters fed early Atlantic overturning circulation upon Antarctic glaciation |
title_full_unstemmed |
Oxygenated deep waters fed early Atlantic overturning circulation upon Antarctic glaciation |
title_sort |
oxygenated deep waters fed early atlantic overturning circulation upon antarctic glaciation |
publishDate |
2023 |
url |
https://eprints.soton.ac.uk/483626/ https://eprints.soton.ac.uk/483626/1/Wang_etal_2023_Pure.pdf |
genre |
Antarc* Antarctic Northwest Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic Northwest Atlantic Southern Ocean |
op_relation |
https://eprints.soton.ac.uk/483626/1/Wang_etal_2023_Pure.pdf Wang, Huanye, Liu, Weiguo, Zhang, Yancheng, Liang, Yu, He, Yuxin, Bohaty, Steven M., Wilson, Paul A. and Liu, Zhonghui (2023) Oxygenated deep waters fed early Atlantic overturning circulation upon Antarctic glaciation. Nature Geoscience, 16 (11), 1014-1019. (doi:10.1038/s41561-023-01292-2 <http://dx.doi.org/10.1038/s41561-023-01292-2>). |
op_doi |
https://doi.org/10.1038/s41561-023-01292-2 |
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Nature Geoscience |
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16 |
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11 |
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1014 |
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1019 |
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1799484199600652288 |