Enhanced Carbonate Counter Pump and upwelling strengths in the Indian sector of the Southern Ocean during MIS 11
While numerous studies have highlighted the central role of Southern Ocean (SO) dynamics in modu- lating rapid increases in atmospheric CO2 concentrations during deglaciations, fewer studies have yet focused on the impact of the Biological Carbon Pump - and more specifically the Carbonate Counter Pu...
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Online Access: | https://serval.unil.ch/notice/serval:BIB_00377EF5A591 https://doi.org/10.1016/j.quascirev.2022.107556 https://serval.unil.ch/resource/serval:BIB_00377EF5A591.P001/REF.pdf |
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ftunivlausanne:oai:serval.unil.ch:BIB_00377EF5A591 2024-02-11T10:08:03+01:00 Enhanced Carbonate Counter Pump and upwelling strengths in the Indian sector of the Southern Ocean during MIS 11 Brandon, Margaux Duchamp-Alphonse, Stéphanie Michel, Elisabeth Landais, Amaëlle Isguder, Gulay Richard, Patricia Pige, Nicolas Bassinot, Franck Jaccard, Samuel L. Bartolini, Annachiara 2022-07 application/pdf https://serval.unil.ch/notice/serval:BIB_00377EF5A591 https://doi.org/10.1016/j.quascirev.2022.107556 https://serval.unil.ch/resource/serval:BIB_00377EF5A591.P001/REF.pdf eng eng info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2022.107556 info:eu-repo/semantics/altIdentifier/pissn/0277-3791 https://serval.unil.ch/notice/serval:BIB_00377EF5A591 doi:10.1016/j.quascirev.2022.107556 https://serval.unil.ch/resource/serval:BIB_00377EF5A591.P001/REF.pdf info:eu-repo/semantics/restrictedAccess Restricted: indefinite embargo Copying allowed only for non-profit organizations https://serval.unil.ch/disclaimer Quaternary Science Reviews, vol. 287, pp. 107556 Geology Archeology Ecology Evolution Behavior and Systematics Global and Planetary Change info:eu-repo/semantics/article article info:eu-repo/semantics/publishedVersion 2022 ftunivlausanne https://doi.org/10.1016/j.quascirev.2022.107556 2024-01-22T01:21:37Z While numerous studies have highlighted the central role of Southern Ocean (SO) dynamics in modu- lating rapid increases in atmospheric CO2 concentrations during deglaciations, fewer studies have yet focused on the impact of the Biological Carbon Pump - and more specifically the Carbonate Counter Pump (CCP) - in contributing to increase the CO2 concentration in oceanic surface waters and thus, in the atmosphere. Here, we present micropaleontological (coccolith, planktonic foraminifera) and geochemical (CaCO3, CaXRF, d13CN. pachyderma) constraints from sediment core MD04-2718 retrieved in the Polar Front Zone of the Indian Ocean covering the time interval spanning Marine Isotope Stage (MIS) 12 to MIS 10 (440,000e360,000 years). We compare our results with published records from the SO to reconstruct past changes in CCP and upwelling dynamics and understand their leverage on the ocean-atmosphere portioning of CO2. We demonstrate that the sharp increase in atmospheric pCO2 during Termination V was likely associated with enhanced deep-water ventilation in the SO, that promoted the release of previously sequestered CO2 to the ocean surface as the westerly wind belt and the frontal system migrated southwards. Enhanced CCP is observed later, during MIS 11, and is likely the consequence of higher sea surface temperature and higher nutrient availability due to the reinvigoration of SO upwelling leading to increased coccolith (and to a lesser degree, planktonic foraminifera) production and export. The low eccentricity signal recorded during MIS 11 might have additionally strengthened the CCP, exerting a specific control on Gephyrocapsa morphotypes. In addition to the strong global biological productivity and higher carbon storage on land, these synergistic mechanisms may have permitted to shape the distinctive 30 ka-long pCO2 plateau characteristic of MIS 11. Article in Journal/Newspaper Planktonic foraminifera Southern Ocean Université de Lausanne (UNIL): Serval - Serveur académique lausannois Indian Southern Ocean Quaternary Science Reviews 287 107556 |
institution |
Open Polar |
collection |
Université de Lausanne (UNIL): Serval - Serveur académique lausannois |
op_collection_id |
ftunivlausanne |
language |
English |
topic |
Geology Archeology Ecology Evolution Behavior and Systematics Global and Planetary Change |
spellingShingle |
Geology Archeology Ecology Evolution Behavior and Systematics Global and Planetary Change Brandon, Margaux Duchamp-Alphonse, Stéphanie Michel, Elisabeth Landais, Amaëlle Isguder, Gulay Richard, Patricia Pige, Nicolas Bassinot, Franck Jaccard, Samuel L. Bartolini, Annachiara Enhanced Carbonate Counter Pump and upwelling strengths in the Indian sector of the Southern Ocean during MIS 11 |
topic_facet |
Geology Archeology Ecology Evolution Behavior and Systematics Global and Planetary Change |
description |
While numerous studies have highlighted the central role of Southern Ocean (SO) dynamics in modu- lating rapid increases in atmospheric CO2 concentrations during deglaciations, fewer studies have yet focused on the impact of the Biological Carbon Pump - and more specifically the Carbonate Counter Pump (CCP) - in contributing to increase the CO2 concentration in oceanic surface waters and thus, in the atmosphere. Here, we present micropaleontological (coccolith, planktonic foraminifera) and geochemical (CaCO3, CaXRF, d13CN. pachyderma) constraints from sediment core MD04-2718 retrieved in the Polar Front Zone of the Indian Ocean covering the time interval spanning Marine Isotope Stage (MIS) 12 to MIS 10 (440,000e360,000 years). We compare our results with published records from the SO to reconstruct past changes in CCP and upwelling dynamics and understand their leverage on the ocean-atmosphere portioning of CO2. We demonstrate that the sharp increase in atmospheric pCO2 during Termination V was likely associated with enhanced deep-water ventilation in the SO, that promoted the release of previously sequestered CO2 to the ocean surface as the westerly wind belt and the frontal system migrated southwards. Enhanced CCP is observed later, during MIS 11, and is likely the consequence of higher sea surface temperature and higher nutrient availability due to the reinvigoration of SO upwelling leading to increased coccolith (and to a lesser degree, planktonic foraminifera) production and export. The low eccentricity signal recorded during MIS 11 might have additionally strengthened the CCP, exerting a specific control on Gephyrocapsa morphotypes. In addition to the strong global biological productivity and higher carbon storage on land, these synergistic mechanisms may have permitted to shape the distinctive 30 ka-long pCO2 plateau characteristic of MIS 11. |
format |
Article in Journal/Newspaper |
author |
Brandon, Margaux Duchamp-Alphonse, Stéphanie Michel, Elisabeth Landais, Amaëlle Isguder, Gulay Richard, Patricia Pige, Nicolas Bassinot, Franck Jaccard, Samuel L. Bartolini, Annachiara |
author_facet |
Brandon, Margaux Duchamp-Alphonse, Stéphanie Michel, Elisabeth Landais, Amaëlle Isguder, Gulay Richard, Patricia Pige, Nicolas Bassinot, Franck Jaccard, Samuel L. Bartolini, Annachiara |
author_sort |
Brandon, Margaux |
title |
Enhanced Carbonate Counter Pump and upwelling strengths in the Indian sector of the Southern Ocean during MIS 11 |
title_short |
Enhanced Carbonate Counter Pump and upwelling strengths in the Indian sector of the Southern Ocean during MIS 11 |
title_full |
Enhanced Carbonate Counter Pump and upwelling strengths in the Indian sector of the Southern Ocean during MIS 11 |
title_fullStr |
Enhanced Carbonate Counter Pump and upwelling strengths in the Indian sector of the Southern Ocean during MIS 11 |
title_full_unstemmed |
Enhanced Carbonate Counter Pump and upwelling strengths in the Indian sector of the Southern Ocean during MIS 11 |
title_sort |
enhanced carbonate counter pump and upwelling strengths in the indian sector of the southern ocean during mis 11 |
publishDate |
2022 |
url |
https://serval.unil.ch/notice/serval:BIB_00377EF5A591 https://doi.org/10.1016/j.quascirev.2022.107556 https://serval.unil.ch/resource/serval:BIB_00377EF5A591.P001/REF.pdf |
geographic |
Indian Southern Ocean |
geographic_facet |
Indian Southern Ocean |
genre |
Planktonic foraminifera Southern Ocean |
genre_facet |
Planktonic foraminifera Southern Ocean |
op_source |
Quaternary Science Reviews, vol. 287, pp. 107556 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2022.107556 info:eu-repo/semantics/altIdentifier/pissn/0277-3791 https://serval.unil.ch/notice/serval:BIB_00377EF5A591 doi:10.1016/j.quascirev.2022.107556 https://serval.unil.ch/resource/serval:BIB_00377EF5A591.P001/REF.pdf |
op_rights |
info:eu-repo/semantics/restrictedAccess Restricted: indefinite embargo Copying allowed only for non-profit organizations https://serval.unil.ch/disclaimer |
op_doi |
https://doi.org/10.1016/j.quascirev.2022.107556 |
container_title |
Quaternary Science Reviews |
container_volume |
287 |
container_start_page |
107556 |
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1790606973946822656 |