Plio-Pleistocene glacial-interglacial productivity changes in the eastern equatorial Pacific upwelling system
International audience The eastern equatorial Pacific Ocean (EEP) upwelling system supports >10% of the present-day global ocean primary production, making it an important component in Earth's atmospheric and marine carbon budget. Traditionally, it has been argued that since intensification...
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ftinsu:oai:HAL:hal-01667900v1 2023-12-17T10:50:32+01:00 Plio-Pleistocene glacial-interglacial productivity changes in the eastern equatorial Pacific upwelling system Jakob, Kim Wilson, Paul A. Bahr, André Bolton, Clara T. Pross, Jörg Fiebig, Jens Friedrich, Oliver Universität Heidelberg Heidelberg = Heidelberg University National Oceanography Centre Southampton (NOC) University of Southampton Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Institute of Geosciences Frankfurt am Main Goethe-Universität Frankfurt am Main 2016 https://hal.science/hal-01667900 https://hal.science/hal-01667900/document https://hal.science/hal-01667900/file/Jacob%20et%20al%202016.pdf https://doi.org/10.1002/2015PA002899 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1002/2015PA002899 hal-01667900 https://hal.science/hal-01667900 https://hal.science/hal-01667900/document https://hal.science/hal-01667900/file/Jacob%20et%20al%202016.pdf doi:10.1002/2015PA002899 info:eu-repo/semantics/OpenAccess ISSN: 0883-8305 Paleoceanography https://hal.science/hal-01667900 Paleoceanography, 2016, 31 (3), pp.453 - 470. ⟨10.1002/2015PA002899⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2016 ftinsu https://doi.org/10.1002/2015PA002899 2023-11-22T17:34:44Z International audience The eastern equatorial Pacific Ocean (EEP) upwelling system supports >10% of the present-day global ocean primary production, making it an important component in Earth's atmospheric and marine carbon budget. Traditionally, it has been argued that since intensification of Northern Hemisphere glaciation (iNHG, ~2.7 Ma), changes in EEP productivity have predominantly depended on trade wind strength-controlled upwelling intensity. An alternative hypothesis suggests that EEP productivity is primarily controlled by nutrient supply from the high southern latitudes via mode waters. Here we present new high-resolution data for the latest Pliocene/early Pleistocene from Ocean Drilling Program Site 849, located within the equatorial divergence system in the heart of the EEP upwelling regime. We use carbon isotopes in benthic and planktic foraminiferal calcite and sand accumulation rates to investigate glacial-interglacial (G-IG) productivity fluctuations between 2.65 and 2.4 Ma (marine isotope stages (MIS) G1 to 94). This interval includes MIS 100, 98, and 96, three large-amplitude glacials (~1‰ in benthic δ18O) representing the culmination of iNHG. Our results suggest that latest Pliocene/early Pleistocene G-IG productivity changes in the EEP were strongly controlled by nutrient supply from Southern Ocean-sourced mode waters. Our records show a clear G-IG cyclicity from MIS 100 onward with productivity levels increasing from full glacial conditions and peaking at glacial terminations. We conclude that enhanced nutrient delivery from high southern latitudes during full glacial conditions together with superimposed intensified regional upwelling toward glacial terminations strongly regulated primary productivity rates in the EEP from MIS 100 onward. Article in Journal/Newspaper Southern Ocean Institut national des sciences de l'Univers: HAL-INSU Pacific Southern Ocean Paleoceanography 31 3 453 470 |
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Institut national des sciences de l'Univers: HAL-INSU |
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ftinsu |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
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[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Jakob, Kim Wilson, Paul A. Bahr, André Bolton, Clara T. Pross, Jörg Fiebig, Jens Friedrich, Oliver Plio-Pleistocene glacial-interglacial productivity changes in the eastern equatorial Pacific upwelling system |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience The eastern equatorial Pacific Ocean (EEP) upwelling system supports >10% of the present-day global ocean primary production, making it an important component in Earth's atmospheric and marine carbon budget. Traditionally, it has been argued that since intensification of Northern Hemisphere glaciation (iNHG, ~2.7 Ma), changes in EEP productivity have predominantly depended on trade wind strength-controlled upwelling intensity. An alternative hypothesis suggests that EEP productivity is primarily controlled by nutrient supply from the high southern latitudes via mode waters. Here we present new high-resolution data for the latest Pliocene/early Pleistocene from Ocean Drilling Program Site 849, located within the equatorial divergence system in the heart of the EEP upwelling regime. We use carbon isotopes in benthic and planktic foraminiferal calcite and sand accumulation rates to investigate glacial-interglacial (G-IG) productivity fluctuations between 2.65 and 2.4 Ma (marine isotope stages (MIS) G1 to 94). This interval includes MIS 100, 98, and 96, three large-amplitude glacials (~1‰ in benthic δ18O) representing the culmination of iNHG. Our results suggest that latest Pliocene/early Pleistocene G-IG productivity changes in the EEP were strongly controlled by nutrient supply from Southern Ocean-sourced mode waters. Our records show a clear G-IG cyclicity from MIS 100 onward with productivity levels increasing from full glacial conditions and peaking at glacial terminations. We conclude that enhanced nutrient delivery from high southern latitudes during full glacial conditions together with superimposed intensified regional upwelling toward glacial terminations strongly regulated primary productivity rates in the EEP from MIS 100 onward. |
author2 |
Universität Heidelberg Heidelberg = Heidelberg University National Oceanography Centre Southampton (NOC) University of Southampton Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Institute of Geosciences Frankfurt am Main Goethe-Universität Frankfurt am Main |
format |
Article in Journal/Newspaper |
author |
Jakob, Kim Wilson, Paul A. Bahr, André Bolton, Clara T. Pross, Jörg Fiebig, Jens Friedrich, Oliver |
author_facet |
Jakob, Kim Wilson, Paul A. Bahr, André Bolton, Clara T. Pross, Jörg Fiebig, Jens Friedrich, Oliver |
author_sort |
Jakob, Kim |
title |
Plio-Pleistocene glacial-interglacial productivity changes in the eastern equatorial Pacific upwelling system |
title_short |
Plio-Pleistocene glacial-interglacial productivity changes in the eastern equatorial Pacific upwelling system |
title_full |
Plio-Pleistocene glacial-interglacial productivity changes in the eastern equatorial Pacific upwelling system |
title_fullStr |
Plio-Pleistocene glacial-interglacial productivity changes in the eastern equatorial Pacific upwelling system |
title_full_unstemmed |
Plio-Pleistocene glacial-interglacial productivity changes in the eastern equatorial Pacific upwelling system |
title_sort |
plio-pleistocene glacial-interglacial productivity changes in the eastern equatorial pacific upwelling system |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.science/hal-01667900 https://hal.science/hal-01667900/document https://hal.science/hal-01667900/file/Jacob%20et%20al%202016.pdf https://doi.org/10.1002/2015PA002899 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 0883-8305 Paleoceanography https://hal.science/hal-01667900 Paleoceanography, 2016, 31 (3), pp.453 - 470. ⟨10.1002/2015PA002899⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2015PA002899 hal-01667900 https://hal.science/hal-01667900 https://hal.science/hal-01667900/document https://hal.science/hal-01667900/file/Jacob%20et%20al%202016.pdf doi:10.1002/2015PA002899 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2015PA002899 |
container_title |
Paleoceanography |
container_volume |
31 |
container_issue |
3 |
container_start_page |
453 |
op_container_end_page |
470 |
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1785575427135242240 |