Meridional Contrasts in Productivity Changes Driven by the Opening of Drake Passage
International audience Changes in atmospheric pCO(2) are widely suggested to have played a major role in both the long-term deterioration of Cenozoic climate and many superimposed rapid climate perturbations such as the pivotal Eocene-Oligocene transition. Changes in marine productivity affecting th...
Published in: | Paleoceanography and Paleoclimatology |
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Main Authors: | , , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2018
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Online Access: | https://hal.science/hal-01806795 https://hal.science/hal-01806795/document https://hal.science/hal-01806795/file/Meridional%20contrasts%20in%20productivity%20changes%20driven%20by%20the%20opening%20of%20Drake%20Passage.pdf https://doi.org/10.1002/2017PA003211 |
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ftcollegfrance:oai:HAL:hal-01806795v1 |
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openpolar |
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Open Polar |
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Collège de France: HAL |
op_collection_id |
ftcollegfrance |
language |
English |
topic |
antarctic circumpolar current eocene-oligocene transition ocean circulation changes global carbon-cycle southern-ocean climate-change biological productivity atmospheric co2 panama seaway glaciation [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
spellingShingle |
antarctic circumpolar current eocene-oligocene transition ocean circulation changes global carbon-cycle southern-ocean climate-change biological productivity atmospheric co2 panama seaway glaciation [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Ladant, Jean-Baptiste Donnadieu, Yannick Bopp, Laurent Lear, Caroline Wilson, Paul Meridional Contrasts in Productivity Changes Driven by the Opening of Drake Passage |
topic_facet |
antarctic circumpolar current eocene-oligocene transition ocean circulation changes global carbon-cycle southern-ocean climate-change biological productivity atmospheric co2 panama seaway glaciation [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
description |
International audience Changes in atmospheric pCO(2) are widely suggested to have played a major role in both the long-term deterioration of Cenozoic climate and many superimposed rapid climate perturbations such as the pivotal Eocene-Oligocene transition. Changes in marine productivity affecting the biological oceanic carbon pump represent one possible cause of past CO2 variability. Here we explore the relationship between ocean gateway change and marine biogeochemistry. Specifically, we use a fully coupled atmosphere-ocean-biogeochemical model (IPSL-CM5A) to examine global ocean paleoproductivity changes in response to the opening of Drake Passage. In our simulations, we find that Drake Passage opening yields a spatially uniform decrease in primary productivity in the low-latitude oceans while the high-latitude response is more spatially heterogeneous. Mechanistically, the low-latitude productivity decrease is a consequence of a fundamental reorganization of ocean circulation when Drake Passage opens driven by the isolation of the Southern Ocean from low-latitude water masses. Nutrient depletion in the low latitudes is driven by a marked decrease in the intensity of deep convection in the Southern Ocean, which drives the accumulation of nutrients at depth and their depletion in the intermediate and upper ocean, especially away from sites of subduction. In the high latitudes, the onset of the Antarctic Circumpolar Current in the model exerts a strong control both on nutrient availability and on regions of deep-water formation. The qualitative agreement between geographically diverse long-term paleoproductivity records and the simulated variations suggests that Drake Passage opening may contribute to the long-term paleoproductivity signal. |
author2 |
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) 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) University of Wolverhampton project Anox-Sea - ANR ANR-12-BS06-0011-03 |
format |
Article in Journal/Newspaper |
author |
Ladant, Jean-Baptiste Donnadieu, Yannick Bopp, Laurent Lear, Caroline Wilson, Paul |
author_facet |
Ladant, Jean-Baptiste Donnadieu, Yannick Bopp, Laurent Lear, Caroline Wilson, Paul |
author_sort |
Ladant, Jean-Baptiste |
title |
Meridional Contrasts in Productivity Changes Driven by the Opening of Drake Passage |
title_short |
Meridional Contrasts in Productivity Changes Driven by the Opening of Drake Passage |
title_full |
Meridional Contrasts in Productivity Changes Driven by the Opening of Drake Passage |
title_fullStr |
Meridional Contrasts in Productivity Changes Driven by the Opening of Drake Passage |
title_full_unstemmed |
Meridional Contrasts in Productivity Changes Driven by the Opening of Drake Passage |
title_sort |
meridional contrasts in productivity changes driven by the opening of drake passage |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.science/hal-01806795 https://hal.science/hal-01806795/document https://hal.science/hal-01806795/file/Meridional%20contrasts%20in%20productivity%20changes%20driven%20by%20the%20opening%20of%20Drake%20Passage.pdf https://doi.org/10.1002/2017PA003211 |
geographic |
Antarctic Drake Passage Southern Ocean The Antarctic |
geographic_facet |
Antarctic Drake Passage Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage Southern Ocean |
op_source |
ISSN: 0883-8305 Paleoceanography https://hal.science/hal-01806795 Paleoceanography, 2018, 33 (3), pp.302 - 317. ⟨10.1002/2017PA003211⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2017PA003211 hal-01806795 https://hal.science/hal-01806795 https://hal.science/hal-01806795/document https://hal.science/hal-01806795/file/Meridional%20contrasts%20in%20productivity%20changes%20driven%20by%20the%20opening%20of%20Drake%20Passage.pdf doi:10.1002/2017PA003211 PRODINRA: 453096 WOS: 000430991200004 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2017PA003211 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
33 |
container_issue |
3 |
container_start_page |
302 |
op_container_end_page |
317 |
_version_ |
1802651511456530432 |
spelling |
ftcollegfrance:oai:HAL:hal-01806795v1 2024-06-23T07:47:25+00:00 Meridional Contrasts in Productivity Changes Driven by the Opening of Drake Passage Ladant, Jean-Baptiste Donnadieu, Yannick Bopp, Laurent Lear, Caroline Wilson, Paul 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) 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) University of Wolverhampton project Anox-Sea - ANR ANR-12-BS06-0011-03 2018-03 https://hal.science/hal-01806795 https://hal.science/hal-01806795/document https://hal.science/hal-01806795/file/Meridional%20contrasts%20in%20productivity%20changes%20driven%20by%20the%20opening%20of%20Drake%20Passage.pdf https://doi.org/10.1002/2017PA003211 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1002/2017PA003211 hal-01806795 https://hal.science/hal-01806795 https://hal.science/hal-01806795/document https://hal.science/hal-01806795/file/Meridional%20contrasts%20in%20productivity%20changes%20driven%20by%20the%20opening%20of%20Drake%20Passage.pdf doi:10.1002/2017PA003211 PRODINRA: 453096 WOS: 000430991200004 info:eu-repo/semantics/OpenAccess ISSN: 0883-8305 Paleoceanography https://hal.science/hal-01806795 Paleoceanography, 2018, 33 (3), pp.302 - 317. ⟨10.1002/2017PA003211⟩ antarctic circumpolar current eocene-oligocene transition ocean circulation changes global carbon-cycle southern-ocean climate-change biological productivity atmospheric co2 panama seaway glaciation [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment info:eu-repo/semantics/article Journal articles 2018 ftcollegfrance https://doi.org/10.1002/2017PA003211 2024-06-13T23:38:27Z International audience Changes in atmospheric pCO(2) are widely suggested to have played a major role in both the long-term deterioration of Cenozoic climate and many superimposed rapid climate perturbations such as the pivotal Eocene-Oligocene transition. Changes in marine productivity affecting the biological oceanic carbon pump represent one possible cause of past CO2 variability. Here we explore the relationship between ocean gateway change and marine biogeochemistry. Specifically, we use a fully coupled atmosphere-ocean-biogeochemical model (IPSL-CM5A) to examine global ocean paleoproductivity changes in response to the opening of Drake Passage. In our simulations, we find that Drake Passage opening yields a spatially uniform decrease in primary productivity in the low-latitude oceans while the high-latitude response is more spatially heterogeneous. Mechanistically, the low-latitude productivity decrease is a consequence of a fundamental reorganization of ocean circulation when Drake Passage opens driven by the isolation of the Southern Ocean from low-latitude water masses. Nutrient depletion in the low latitudes is driven by a marked decrease in the intensity of deep convection in the Southern Ocean, which drives the accumulation of nutrients at depth and their depletion in the intermediate and upper ocean, especially away from sites of subduction. In the high latitudes, the onset of the Antarctic Circumpolar Current in the model exerts a strong control both on nutrient availability and on regions of deep-water formation. The qualitative agreement between geographically diverse long-term paleoproductivity records and the simulated variations suggests that Drake Passage opening may contribute to the long-term paleoproductivity signal. Article in Journal/Newspaper Antarc* Antarctic Drake Passage Southern Ocean Collège de France: HAL Antarctic Drake Passage Southern Ocean The Antarctic Paleoceanography and Paleoclimatology 33 3 302 317 |