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Early Pliocene onset of modern Nordic Seas circulation related to ocean gateway changes

The globally warm climate of the early Pliocene gradually cooled from 4 million years ago, synchronous with decreasing atmospheric CO(2) concentrations. In contrast, palaeoceanographic records indicate that the Nordic Seas cooled during the earliest Pliocene, before global cooling. However, a lack o...

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Autores principales: De Schepper, Stijn, Schreck, Michael, Beck, Kristina Marie, Matthiessen, Jens, Fahl, Kirsten, Mangerud, Gunn
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Pub. Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4639897/
https://www.ncbi.nlm.nih.gov/pubmed/26507275
http://dx.doi.org/10.1038/ncomms9659
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author De Schepper, Stijn
Schreck, Michael
Beck, Kristina Marie
Matthiessen, Jens
Fahl, Kirsten
Mangerud, Gunn
author_facet De Schepper, Stijn
Schreck, Michael
Beck, Kristina Marie
Matthiessen, Jens
Fahl, Kirsten
Mangerud, Gunn
author_sort De Schepper, Stijn
collection PubMed
description The globally warm climate of the early Pliocene gradually cooled from 4 million years ago, synchronous with decreasing atmospheric CO(2) concentrations. In contrast, palaeoceanographic records indicate that the Nordic Seas cooled during the earliest Pliocene, before global cooling. However, a lack of knowledge regarding the precise timing of Nordic Seas cooling has limited our understanding of the governing mechanisms. Here, using marine palynology, we show that cooling in the Nordic Seas was coincident with the first trans-Arctic migration of cool-water Pacific mollusks around 4.5 million years ago, and followed by the development of a modern-like Nordic Seas surface circulation. Nordic Seas cooling precedes global cooling by 500,000 years; as such, we propose that reconfiguration of the Bering Strait and Central American Seaway triggered the development of a modern circulation in the Nordic Seas, which is essential for North Atlantic Deep Water formation and a precursor for more widespread Greenland glaciation in the late Pliocene.
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spelling pubmed-46398972015-12-08 Early Pliocene onset of modern Nordic Seas circulation related to ocean gateway changes De Schepper, Stijn Schreck, Michael Beck, Kristina Marie Matthiessen, Jens Fahl, Kirsten Mangerud, Gunn Nat Commun Article The globally warm climate of the early Pliocene gradually cooled from 4 million years ago, synchronous with decreasing atmospheric CO(2) concentrations. In contrast, palaeoceanographic records indicate that the Nordic Seas cooled during the earliest Pliocene, before global cooling. However, a lack of knowledge regarding the precise timing of Nordic Seas cooling has limited our understanding of the governing mechanisms. Here, using marine palynology, we show that cooling in the Nordic Seas was coincident with the first trans-Arctic migration of cool-water Pacific mollusks around 4.5 million years ago, and followed by the development of a modern-like Nordic Seas surface circulation. Nordic Seas cooling precedes global cooling by 500,000 years; as such, we propose that reconfiguration of the Bering Strait and Central American Seaway triggered the development of a modern circulation in the Nordic Seas, which is essential for North Atlantic Deep Water formation and a precursor for more widespread Greenland glaciation in the late Pliocene. Nature Pub. Group 2015-10-28 /pmc/articles/PMC4639897/ /pubmed/26507275 http://dx.doi.org/10.1038/ncomms9659 Text en Copyright © 2015, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
De Schepper, Stijn
Schreck, Michael
Beck, Kristina Marie
Matthiessen, Jens
Fahl, Kirsten
Mangerud, Gunn
Early Pliocene onset of modern Nordic Seas circulation related to ocean gateway changes
title Early Pliocene onset of modern Nordic Seas circulation related to ocean gateway changes
title_full Early Pliocene onset of modern Nordic Seas circulation related to ocean gateway changes
title_fullStr Early Pliocene onset of modern Nordic Seas circulation related to ocean gateway changes
title_full_unstemmed Early Pliocene onset of modern Nordic Seas circulation related to ocean gateway changes
title_short Early Pliocene onset of modern Nordic Seas circulation related to ocean gateway changes
title_sort early pliocene onset of modern nordic seas circulation related to ocean gateway changes
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4639897/
https://www.ncbi.nlm.nih.gov/pubmed/26507275
http://dx.doi.org/10.1038/ncomms9659
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