Evolution of the zonal gradients across the equatorial Pacific during the Miocene–Pleistocene
Combining U k 37 0 - and TEX 86 -derived temperatures and oxygen isotopic values of mixed-layer and thermocline species from the IODP site U1338 (East Equatorial Pacific) and ODP Site 806 (West Equatorial Pacific) we assess the evolution of the zonal sea-surface temperature gradients and thermocline...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/387694 2023-11-12T04:02:12+01:00 Evolution of the zonal gradients across the equatorial Pacific during the Miocene–Pleistocene Beltran, Catherine Rousselle, Gabrielle de Rafélis, Marc Sicre, Marie Alexandrine Labourdette, Nathalie Schouten, Stefan Organic geochemistry Organic geochemistry & molecular biogeology 2019-03-25 application/pdf https://dspace.library.uu.nl/handle/1874/387694 en eng 1527-1404 https://dspace.library.uu.nl/handle/1874/387694 info:eu-repo/semantics/OpenAccess Geology Article 2019 ftunivutrecht 2023-11-01T23:21:53Z Combining U k 37 0 - and TEX 86 -derived temperatures and oxygen isotopic values of mixed-layer and thermocline species from the IODP site U1338 (East Equatorial Pacific) and ODP Site 806 (West Equatorial Pacific) we assess the evolution of the zonal sea-surface temperature gradients and thermocline depth across the equatorial Pacific from the late Miocene through the Pleistocene. Data suggest a long-term shoaling of the thermocline along the equator throughout the Miocene–Pliocene that accelerated around 5.3 Ma. We identify a critical transition at about 3.8 Ma from a El-Niño-like-dominated mean state during the late Miocene and early Pliocene to a La-Niña-like-dominated state during the late Pliocene–Pleistocene. This transition coincides with the restriction of the Indonesian seaway and the onset of ice growth in the northern hemisphere and in Antarctica that led to the long-term strengthening of the Walker circulation and affected low-latitude zonal gradient. Article in Journal/Newspaper Antarc* Antarctica Utrecht University Repository Pacific |
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Open Polar |
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Utrecht University Repository |
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ftunivutrecht |
language |
English |
topic |
Geology |
spellingShingle |
Geology Beltran, Catherine Rousselle, Gabrielle de Rafélis, Marc Sicre, Marie Alexandrine Labourdette, Nathalie Schouten, Stefan Evolution of the zonal gradients across the equatorial Pacific during the Miocene–Pleistocene |
topic_facet |
Geology |
description |
Combining U k 37 0 - and TEX 86 -derived temperatures and oxygen isotopic values of mixed-layer and thermocline species from the IODP site U1338 (East Equatorial Pacific) and ODP Site 806 (West Equatorial Pacific) we assess the evolution of the zonal sea-surface temperature gradients and thermocline depth across the equatorial Pacific from the late Miocene through the Pleistocene. Data suggest a long-term shoaling of the thermocline along the equator throughout the Miocene–Pliocene that accelerated around 5.3 Ma. We identify a critical transition at about 3.8 Ma from a El-Niño-like-dominated mean state during the late Miocene and early Pliocene to a La-Niña-like-dominated state during the late Pliocene–Pleistocene. This transition coincides with the restriction of the Indonesian seaway and the onset of ice growth in the northern hemisphere and in Antarctica that led to the long-term strengthening of the Walker circulation and affected low-latitude zonal gradient. |
author2 |
Organic geochemistry Organic geochemistry & molecular biogeology |
format |
Article in Journal/Newspaper |
author |
Beltran, Catherine Rousselle, Gabrielle de Rafélis, Marc Sicre, Marie Alexandrine Labourdette, Nathalie Schouten, Stefan |
author_facet |
Beltran, Catherine Rousselle, Gabrielle de Rafélis, Marc Sicre, Marie Alexandrine Labourdette, Nathalie Schouten, Stefan |
author_sort |
Beltran, Catherine |
title |
Evolution of the zonal gradients across the equatorial Pacific during the Miocene–Pleistocene |
title_short |
Evolution of the zonal gradients across the equatorial Pacific during the Miocene–Pleistocene |
title_full |
Evolution of the zonal gradients across the equatorial Pacific during the Miocene–Pleistocene |
title_fullStr |
Evolution of the zonal gradients across the equatorial Pacific during the Miocene–Pleistocene |
title_full_unstemmed |
Evolution of the zonal gradients across the equatorial Pacific during the Miocene–Pleistocene |
title_sort |
evolution of the zonal gradients across the equatorial pacific during the miocene–pleistocene |
publishDate |
2019 |
url |
https://dspace.library.uu.nl/handle/1874/387694 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
1527-1404 https://dspace.library.uu.nl/handle/1874/387694 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782333876854587392 |