Pliocene oceanic seaways and global climate
Tectonically induced changes in oceanic seaways had profound effects on global and regional climate during the Late Neogene. The constriction of the Central American Seaway reached a critical threshold during the early Pliocene ~4.8–4 million years (Ma) ago. Model simulations indicate the strengthen...
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ftoceanrep:oai:oceanrep.geomar.de:35614 2023-05-15T17:25:25+02:00 Pliocene oceanic seaways and global climate Karas, Cyrus Nürnberg, Dirk Bahr, André Groeneveld, Jeroen Herrle, J. O. Tiedemann, Ralf deMenocal, P. B. 2017-01-05 text https://oceanrep.geomar.de/id/eprint/35614/ https://oceanrep.geomar.de/id/eprint/35614/1/Karas.pdf https://doi.org/10.1038/srep39842 en eng Nature Research https://oceanrep.geomar.de/id/eprint/35614/1/Karas.pdf Karas, C., Nürnberg, D. , Bahr, A., Groeneveld, J., Herrle, J. O., Tiedemann, R. and deMenocal, P. B. (2017) Pliocene oceanic seaways and global climate. Open Access Scientific Reports, 7 (39842). DOI 10.1038/srep39842 <https://doi.org/10.1038/srep39842>. doi:10.1038/srep39842 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2017 ftoceanrep https://doi.org/10.1038/srep39842 2023-04-07T15:30:19Z Tectonically induced changes in oceanic seaways had profound effects on global and regional climate during the Late Neogene. The constriction of the Central American Seaway reached a critical threshold during the early Pliocene ~4.8–4 million years (Ma) ago. Model simulations indicate the strengthening of the Atlantic Meridional Overturning Circulation (AMOC) with a signature warming response in the Northern Hemisphere and cooling in the Southern Hemisphere. Subsequently, between ~4–3 Ma, the constriction of the Indonesian Seaway impacted regional climate and might have accelerated the Northern Hemisphere Glaciation. We here present Pliocene Atlantic interhemispheric sea surface temperature and salinity gradients (deduced from foraminiferal Mg/Ca and stable oxygen isotopes, δ18O) in combination with a recently published benthic stable carbon isotope (δ13C) record from the southernmost extent of North Atlantic Deep Water to reconstruct gateway-related changes in the AMOC mode. After an early reduction of the AMOC at ~5.3 Ma, we show in agreement with model simulations of the impacts of Central American Seaway closure a strengthened AMOC with a global climate signature. During ~3.8–3 Ma, we suggest a weakening of the AMOC in line with the global cooling trend, with possible contributions from the constriction of the Indonesian Seaway. Article in Journal/Newspaper North Atlantic Deep Water North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Scientific Reports 7 1 |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
Tectonically induced changes in oceanic seaways had profound effects on global and regional climate during the Late Neogene. The constriction of the Central American Seaway reached a critical threshold during the early Pliocene ~4.8–4 million years (Ma) ago. Model simulations indicate the strengthening of the Atlantic Meridional Overturning Circulation (AMOC) with a signature warming response in the Northern Hemisphere and cooling in the Southern Hemisphere. Subsequently, between ~4–3 Ma, the constriction of the Indonesian Seaway impacted regional climate and might have accelerated the Northern Hemisphere Glaciation. We here present Pliocene Atlantic interhemispheric sea surface temperature and salinity gradients (deduced from foraminiferal Mg/Ca and stable oxygen isotopes, δ18O) in combination with a recently published benthic stable carbon isotope (δ13C) record from the southernmost extent of North Atlantic Deep Water to reconstruct gateway-related changes in the AMOC mode. After an early reduction of the AMOC at ~5.3 Ma, we show in agreement with model simulations of the impacts of Central American Seaway closure a strengthened AMOC with a global climate signature. During ~3.8–3 Ma, we suggest a weakening of the AMOC in line with the global cooling trend, with possible contributions from the constriction of the Indonesian Seaway. |
format |
Article in Journal/Newspaper |
author |
Karas, Cyrus Nürnberg, Dirk Bahr, André Groeneveld, Jeroen Herrle, J. O. Tiedemann, Ralf deMenocal, P. B. |
spellingShingle |
Karas, Cyrus Nürnberg, Dirk Bahr, André Groeneveld, Jeroen Herrle, J. O. Tiedemann, Ralf deMenocal, P. B. Pliocene oceanic seaways and global climate |
author_facet |
Karas, Cyrus Nürnberg, Dirk Bahr, André Groeneveld, Jeroen Herrle, J. O. Tiedemann, Ralf deMenocal, P. B. |
author_sort |
Karas, Cyrus |
title |
Pliocene oceanic seaways and global climate |
title_short |
Pliocene oceanic seaways and global climate |
title_full |
Pliocene oceanic seaways and global climate |
title_fullStr |
Pliocene oceanic seaways and global climate |
title_full_unstemmed |
Pliocene oceanic seaways and global climate |
title_sort |
pliocene oceanic seaways and global climate |
publisher |
Nature Research |
publishDate |
2017 |
url |
https://oceanrep.geomar.de/id/eprint/35614/ https://oceanrep.geomar.de/id/eprint/35614/1/Karas.pdf https://doi.org/10.1038/srep39842 |
genre |
North Atlantic Deep Water North Atlantic |
genre_facet |
North Atlantic Deep Water North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/35614/1/Karas.pdf Karas, C., Nürnberg, D. , Bahr, A., Groeneveld, J., Herrle, J. O., Tiedemann, R. and deMenocal, P. B. (2017) Pliocene oceanic seaways and global climate. Open Access Scientific Reports, 7 (39842). DOI 10.1038/srep39842 <https://doi.org/10.1038/srep39842>. doi:10.1038/srep39842 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1038/srep39842 |
container_title |
Scientific Reports |
container_volume |
7 |
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1 |
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1766116836499259392 |