Meridional contrasts in productivity changes driven by the opening of Drake Passage
Changes in atmospheric pCO2 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 carb...
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ftsouthampton:oai:eprints.soton.ac.uk:419023 2024-02-11T09:56:27+01:00 Meridional contrasts in productivity changes driven by the opening of Drake Passage Ladant, Jean-Baptiste Donnadieu, Yannick Bopp, Laurent Lear, Caroline H. Wilson, Paul A. 2018-03-25 text https://eprints.soton.ac.uk/419023/ https://eprints.soton.ac.uk/419023/1/Ladant_etal_Final_paper_SOM_2_.pdf https://eprints.soton.ac.uk/419023/2/Ladant_etal_Final_paper_SOM_2_.pdf en English eng https://eprints.soton.ac.uk/419023/1/Ladant_etal_Final_paper_SOM_2_.pdf https://eprints.soton.ac.uk/419023/2/Ladant_etal_Final_paper_SOM_2_.pdf Ladant, Jean-Baptiste, Donnadieu, Yannick, Bopp, Laurent, Lear, Caroline H. and Wilson, Paul A. (2018) Meridional contrasts in productivity changes driven by the opening of Drake Passage. Paleoceanography and Paleoclimatology. (doi:10.1002/2017PA003211 <http://dx.doi.org/10.1002/2017PA003211>). accepted_manuscript Article PeerReviewed 2018 ftsouthampton https://doi.org/10.1002/2017PA003211 2024-01-25T23:19:11Z Changes in atmospheric pCO2 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 University of Southampton: e-Prints Soton Antarctic Southern Ocean The Antarctic Drake Passage Paleoceanography and Paleoclimatology 33 3 302 317 |
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Open Polar |
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University of Southampton: e-Prints Soton |
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ftsouthampton |
language |
English |
description |
Changes in atmospheric pCO2 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. |
format |
Article in Journal/Newspaper |
author |
Ladant, Jean-Baptiste Donnadieu, Yannick Bopp, Laurent Lear, Caroline H. Wilson, Paul A. |
spellingShingle |
Ladant, Jean-Baptiste Donnadieu, Yannick Bopp, Laurent Lear, Caroline H. Wilson, Paul A. Meridional contrasts in productivity changes driven by the opening of Drake Passage |
author_facet |
Ladant, Jean-Baptiste Donnadieu, Yannick Bopp, Laurent Lear, Caroline H. Wilson, Paul A. |
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 |
publishDate |
2018 |
url |
https://eprints.soton.ac.uk/419023/ https://eprints.soton.ac.uk/419023/1/Ladant_etal_Final_paper_SOM_2_.pdf https://eprints.soton.ac.uk/419023/2/Ladant_etal_Final_paper_SOM_2_.pdf |
geographic |
Antarctic Southern Ocean The Antarctic Drake Passage |
geographic_facet |
Antarctic Southern Ocean The Antarctic Drake Passage |
genre |
Antarc* Antarctic Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage Southern Ocean |
op_relation |
https://eprints.soton.ac.uk/419023/1/Ladant_etal_Final_paper_SOM_2_.pdf https://eprints.soton.ac.uk/419023/2/Ladant_etal_Final_paper_SOM_2_.pdf Ladant, Jean-Baptiste, Donnadieu, Yannick, Bopp, Laurent, Lear, Caroline H. and Wilson, Paul A. (2018) Meridional contrasts in productivity changes driven by the opening of Drake Passage. Paleoceanography and Paleoclimatology. (doi:10.1002/2017PA003211 <http://dx.doi.org/10.1002/2017PA003211>). |
op_rights |
accepted_manuscript |
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 |
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1790603199483215872 |