The Atlantic Meridional Overturning Circulation as productivity regulator of the North Atlantic Subtropical Gyre
International audience Spatially extensive and intense phytoplankton blooms observed off Iberia, in satellite pictures, are driven by significant nutrient supply by upper-ocean vertical mesoscale activity rather than by horizontal advection by coastal upwelling. Productivity of oligotrophic regions...
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Online Access: | https://hal.science/hal-02525025 https://hal.science/hal-02525025/document https://hal.science/hal-02525025/file/02525025Y.pdf https://doi.org/10.1017/qua.2018.88 |
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ftceafr:oai:HAL:hal-02525025v1 2024-09-15T18:20:43+00:00 The Atlantic Meridional Overturning Circulation as productivity regulator of the North Atlantic Subtropical Gyre Nave, Silvia Lebreiro, Susana Michel, Elisabeth Kissel, Catherine Figueiredo, Maria Ondina Guihou, Abel Ferreira, António Labeyrie, Laurent Alberto, Ana Laboratório Nacional de Energia e Geologia (LNEG) Instituto Geológico y Minero de España (IGME) Paléocéanographie (PALEOCEAN) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Climat et Magnétisme (CLIMAG) British Geological Survey (BGS) 2019 https://hal.science/hal-02525025 https://hal.science/hal-02525025/document https://hal.science/hal-02525025/file/02525025Y.pdf https://doi.org/10.1017/qua.2018.88 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1017/qua.2018.88 hal-02525025 https://hal.science/hal-02525025 https://hal.science/hal-02525025/document https://hal.science/hal-02525025/file/02525025Y.pdf doi:10.1017/qua.2018.88 info:eu-repo/semantics/OpenAccess ISSN: 0033-5894 EISSN: 1096-0287 Quaternary Research https://hal.science/hal-02525025 Quaternary Research, 2019, 91 (1), pp.399-413. ⟨10.1017/qua.2018.88⟩ Tore Seamount Productivity AMOC Mesoscale eddies [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2019 ftceafr https://doi.org/10.1017/qua.2018.88 2024-07-22T13:15:03Z International audience Spatially extensive and intense phytoplankton blooms observed off Iberia, in satellite pictures, are driven by significant nutrient supply by upper-ocean vertical mesoscale activity rather than by horizontal advection by coastal upwelling. Productivity of oligotrophic regions is still poorly depicted by discrete instrumental and model data sets. The paleoproductivity reconstructions of these areas represent the mean productivity over long periods, bringing new insights into the total biomass fluxes. Here, we present paleoproductivity records from the oceanic Tore Seamount region, covering the period from 140 to 60 ka. They show higher nutrient supplies during Termination II, Marine Oxygen Isotope Stage (MIS) 4, MIS 6, and warming transitions of the MIS 5 sub-stages. The highest nutrient content (higher productivity) in phase with tracers of bottom-water ventilation (benthic δ13C,231Pa/230Th) establishes a strong linkage with variability of Southern Ocean-sourced waters. Low productivity and ventilation over warm sub-stages of MIS 5 respond instead to North Atlantic Deep Water. Assuming that the Tore Seamount is representative of oligotrophic regions, the glacial-interglacial relationship observed between paleoproductivity and Atlantic Meridional Overturning Circulation strength opens new insights into the importance of estimating the total biomass in these regions. The subtropical gyres might play a considerable role in the carbon cycle over (sub-)glacial-interglacial time scales than previously thought. Article in Journal/Newspaper North Atlantic Deep Water North Atlantic Southern Ocean HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) Quaternary Research 91 1 399 413 |
institution |
Open Polar |
collection |
HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) |
op_collection_id |
ftceafr |
language |
English |
topic |
Tore Seamount Productivity AMOC Mesoscale eddies [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
Tore Seamount Productivity AMOC Mesoscale eddies [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Nave, Silvia Lebreiro, Susana Michel, Elisabeth Kissel, Catherine Figueiredo, Maria Ondina Guihou, Abel Ferreira, António Labeyrie, Laurent Alberto, Ana The Atlantic Meridional Overturning Circulation as productivity regulator of the North Atlantic Subtropical Gyre |
topic_facet |
Tore Seamount Productivity AMOC Mesoscale eddies [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience Spatially extensive and intense phytoplankton blooms observed off Iberia, in satellite pictures, are driven by significant nutrient supply by upper-ocean vertical mesoscale activity rather than by horizontal advection by coastal upwelling. Productivity of oligotrophic regions is still poorly depicted by discrete instrumental and model data sets. The paleoproductivity reconstructions of these areas represent the mean productivity over long periods, bringing new insights into the total biomass fluxes. Here, we present paleoproductivity records from the oceanic Tore Seamount region, covering the period from 140 to 60 ka. They show higher nutrient supplies during Termination II, Marine Oxygen Isotope Stage (MIS) 4, MIS 6, and warming transitions of the MIS 5 sub-stages. The highest nutrient content (higher productivity) in phase with tracers of bottom-water ventilation (benthic δ13C,231Pa/230Th) establishes a strong linkage with variability of Southern Ocean-sourced waters. Low productivity and ventilation over warm sub-stages of MIS 5 respond instead to North Atlantic Deep Water. Assuming that the Tore Seamount is representative of oligotrophic regions, the glacial-interglacial relationship observed between paleoproductivity and Atlantic Meridional Overturning Circulation strength opens new insights into the importance of estimating the total biomass in these regions. The subtropical gyres might play a considerable role in the carbon cycle over (sub-)glacial-interglacial time scales than previously thought. |
author2 |
Laboratório Nacional de Energia e Geologia (LNEG) Instituto Geológico y Minero de España (IGME) Paléocéanographie (PALEOCEAN) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Climat et Magnétisme (CLIMAG) British Geological Survey (BGS) |
format |
Article in Journal/Newspaper |
author |
Nave, Silvia Lebreiro, Susana Michel, Elisabeth Kissel, Catherine Figueiredo, Maria Ondina Guihou, Abel Ferreira, António Labeyrie, Laurent Alberto, Ana |
author_facet |
Nave, Silvia Lebreiro, Susana Michel, Elisabeth Kissel, Catherine Figueiredo, Maria Ondina Guihou, Abel Ferreira, António Labeyrie, Laurent Alberto, Ana |
author_sort |
Nave, Silvia |
title |
The Atlantic Meridional Overturning Circulation as productivity regulator of the North Atlantic Subtropical Gyre |
title_short |
The Atlantic Meridional Overturning Circulation as productivity regulator of the North Atlantic Subtropical Gyre |
title_full |
The Atlantic Meridional Overturning Circulation as productivity regulator of the North Atlantic Subtropical Gyre |
title_fullStr |
The Atlantic Meridional Overturning Circulation as productivity regulator of the North Atlantic Subtropical Gyre |
title_full_unstemmed |
The Atlantic Meridional Overturning Circulation as productivity regulator of the North Atlantic Subtropical Gyre |
title_sort |
atlantic meridional overturning circulation as productivity regulator of the north atlantic subtropical gyre |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.science/hal-02525025 https://hal.science/hal-02525025/document https://hal.science/hal-02525025/file/02525025Y.pdf https://doi.org/10.1017/qua.2018.88 |
genre |
North Atlantic Deep Water North Atlantic Southern Ocean |
genre_facet |
North Atlantic Deep Water North Atlantic Southern Ocean |
op_source |
ISSN: 0033-5894 EISSN: 1096-0287 Quaternary Research https://hal.science/hal-02525025 Quaternary Research, 2019, 91 (1), pp.399-413. ⟨10.1017/qua.2018.88⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1017/qua.2018.88 hal-02525025 https://hal.science/hal-02525025 https://hal.science/hal-02525025/document https://hal.science/hal-02525025/file/02525025Y.pdf doi:10.1017/qua.2018.88 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1017/qua.2018.88 |
container_title |
Quaternary Research |
container_volume |
91 |
container_issue |
1 |
container_start_page |
399 |
op_container_end_page |
413 |
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1810459100290482176 |