Plio-Pleistocene glacial-interglacial productivity changes in the eastern equatorial Pacific upwelling system
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...
Published in: | Paleoceanography |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2016
|
Subjects: | |
Online Access: | https://eprints.soton.ac.uk/391014/ https://eprints.soton.ac.uk/391014/1/palo20305.pdf |
id |
ftsouthampton:oai:eprints.soton.ac.uk:391014 |
---|---|
record_format |
openpolar |
spelling |
ftsouthampton:oai:eprints.soton.ac.uk:391014 2024-02-11T10:08:52+01:00 Plio-Pleistocene glacial-interglacial productivity changes in the eastern equatorial Pacific upwelling system Jakob, Kim A. Wilson, Paul A. Bahr, André Bolton, Clara T. Pross, Jörg Fiebig, Jens Friedrich, Oliver 2016-04-15 text https://eprints.soton.ac.uk/391014/ https://eprints.soton.ac.uk/391014/1/palo20305.pdf en English eng https://eprints.soton.ac.uk/391014/1/palo20305.pdf Jakob, Kim A., Wilson, Paul A., Bahr, André, Bolton, Clara T., Pross, Jörg, Fiebig, Jens and Friedrich, Oliver (2016) Plio-Pleistocene glacial-interglacial productivity changes in the eastern equatorial Pacific upwelling system. Paleoceanography, 31 (5), 453-470. (doi:10.1002/2015PA002899 <http://dx.doi.org/10.1002/2015PA002899>). Article PeerReviewed 2016 ftsouthampton https://doi.org/10.1002/2015PA002899 2024-01-25T23:18:59Z 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 ?18O) 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 University of Southampton: e-Prints Soton Southern Ocean Pacific Paleoceanography 31 3 453 470 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
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 ?18O) 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. |
format |
Article in Journal/Newspaper |
author |
Jakob, Kim A. Wilson, Paul A. Bahr, André Bolton, Clara T. Pross, Jörg Fiebig, Jens Friedrich, Oliver |
spellingShingle |
Jakob, Kim A. 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 |
author_facet |
Jakob, Kim A. Wilson, Paul A. Bahr, André Bolton, Clara T. Pross, Jörg Fiebig, Jens Friedrich, Oliver |
author_sort |
Jakob, Kim A. |
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 |
publishDate |
2016 |
url |
https://eprints.soton.ac.uk/391014/ https://eprints.soton.ac.uk/391014/1/palo20305.pdf |
geographic |
Southern Ocean Pacific |
geographic_facet |
Southern Ocean Pacific |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
https://eprints.soton.ac.uk/391014/1/palo20305.pdf Jakob, Kim A., Wilson, Paul A., Bahr, André, Bolton, Clara T., Pross, Jörg, Fiebig, Jens and Friedrich, Oliver (2016) Plio-Pleistocene glacial-interglacial productivity changes in the eastern equatorial Pacific upwelling system. Paleoceanography, 31 (5), 453-470. (doi:10.1002/2015PA002899 <http://dx.doi.org/10.1002/2015PA002899>). |
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 |
_version_ |
1790608496722444288 |