Nonmonotonic Response of Primary Production and Export to Changes in Mixed‐Layer Depth in the Southern Ocean
International audience Ongoing and future changes in wind and temperature are predicted to alter upper ocean vertical mixing across the Southern Ocean. How these changes will affect primary production (PP) remains unclear as mixing influences the two controlling factors: light and iron. We used a la...
Published in: | Geophysical Research Letters |
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Main Authors: | , , , |
Other Authors: | , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2019
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Online Access: | https://hal.science/hal-02117445 https://hal.science/hal-02117445/document https://hal.science/hal-02117445/file/845568_2_merged_1552348539_small.pdf https://doi.org/10.1029/2018GL081788 |
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Open Polar |
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Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Llort, Joan Lévy, Marina Sallée, Jean-Baptiste Tagliabue, Alessandro Nonmonotonic Response of Primary Production and Export to Changes in Mixed‐Layer Depth in the Southern Ocean |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience Ongoing and future changes in wind and temperature are predicted to alter upper ocean vertical mixing across the Southern Ocean. How these changes will affect primary production (PP) remains unclear as mixing influences the two controlling factors: light and iron. We used a large ensemble of 1‐D‐biogeochemical model simulations to explore the impacts of changes in mixed‐layer depths on PP in the Southern Ocean. In summer, shoaling mixed‐layer depth always reduced depth‐integrated PP, despite increasing production rates. In winter, shoaling mixed layers had a two‐staged impact: for moderate shoaling PP increased as light conditions improved, but more pronounced shoaling decreased iron supply, which reduced PP. The fraction of PP exported below 100 m also presented a nonmonotonic behavior. This suggests a potential future shift from a situation where reduced winter mixing increases PP and export, to a situation where PP and export may collapse if the ML shoals above a threshold depth. |
author2 |
Institute for Marine and Antarctic Studies Hobart (IMAS) University of Tasmania Hobart, Australia (UTAS) Processus et interactions de fine échelle océanique (PROTEO) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) School of Environmental Sciences Liverpool University of Liverpool ANR-16-CE01-0014,SOBUMS,Comprendre la réponse du cycle du carbone dans l'océan austral au stress climatique(2016) European Project: 317699,EC:FP7:PEOPLE,FP7-PEOPLE-2012-IRSES,SOCCLI(2012) |
format |
Article in Journal/Newspaper |
author |
Llort, Joan Lévy, Marina Sallée, Jean-Baptiste Tagliabue, Alessandro |
author_facet |
Llort, Joan Lévy, Marina Sallée, Jean-Baptiste Tagliabue, Alessandro |
author_sort |
Llort, Joan |
title |
Nonmonotonic Response of Primary Production and Export to Changes in Mixed‐Layer Depth in the Southern Ocean |
title_short |
Nonmonotonic Response of Primary Production and Export to Changes in Mixed‐Layer Depth in the Southern Ocean |
title_full |
Nonmonotonic Response of Primary Production and Export to Changes in Mixed‐Layer Depth in the Southern Ocean |
title_fullStr |
Nonmonotonic Response of Primary Production and Export to Changes in Mixed‐Layer Depth in the Southern Ocean |
title_full_unstemmed |
Nonmonotonic Response of Primary Production and Export to Changes in Mixed‐Layer Depth in the Southern Ocean |
title_sort |
nonmonotonic response of primary production and export to changes in mixed‐layer depth in the southern ocean |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.science/hal-02117445 https://hal.science/hal-02117445/document https://hal.science/hal-02117445/file/845568_2_merged_1552348539_small.pdf https://doi.org/10.1029/2018GL081788 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-02117445 Geophysical Research Letters, 2019, 46 (6), pp.3368-3377. ⟨10.1029/2018GL081788⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2018GL081788 info:eu-repo/grantAgreement/EC/FP7/317699/EU/The role of Southern Ocean Carbon cycle under CLImate change/SOCCLI hal-02117445 https://hal.science/hal-02117445 https://hal.science/hal-02117445/document https://hal.science/hal-02117445/file/845568_2_merged_1552348539_small.pdf doi:10.1029/2018GL081788 IRD: fdi:010075620 WOS: 000464650400039 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2018GL081788 |
container_title |
Geophysical Research Letters |
container_volume |
46 |
container_issue |
6 |
container_start_page |
3368 |
op_container_end_page |
3377 |
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1766205353738895360 |
spelling |
ftunivnantes:oai:HAL:hal-02117445v1 2023-05-15T18:24:37+02:00 Nonmonotonic Response of Primary Production and Export to Changes in Mixed‐Layer Depth in the Southern Ocean Llort, Joan Lévy, Marina Sallée, Jean-Baptiste Tagliabue, Alessandro Institute for Marine and Antarctic Studies Hobart (IMAS) University of Tasmania Hobart, Australia (UTAS) Processus et interactions de fine échelle océanique (PROTEO) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) School of Environmental Sciences Liverpool University of Liverpool ANR-16-CE01-0014,SOBUMS,Comprendre la réponse du cycle du carbone dans l'océan austral au stress climatique(2016) European Project: 317699,EC:FP7:PEOPLE,FP7-PEOPLE-2012-IRSES,SOCCLI(2012) 2019 https://hal.science/hal-02117445 https://hal.science/hal-02117445/document https://hal.science/hal-02117445/file/845568_2_merged_1552348539_small.pdf https://doi.org/10.1029/2018GL081788 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2018GL081788 info:eu-repo/grantAgreement/EC/FP7/317699/EU/The role of Southern Ocean Carbon cycle under CLImate change/SOCCLI hal-02117445 https://hal.science/hal-02117445 https://hal.science/hal-02117445/document https://hal.science/hal-02117445/file/845568_2_merged_1552348539_small.pdf doi:10.1029/2018GL081788 IRD: fdi:010075620 WOS: 000464650400039 info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-02117445 Geophysical Research Letters, 2019, 46 (6), pp.3368-3377. ⟨10.1029/2018GL081788⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2019 ftunivnantes https://doi.org/10.1029/2018GL081788 2023-01-18T00:33:20Z International audience Ongoing and future changes in wind and temperature are predicted to alter upper ocean vertical mixing across the Southern Ocean. How these changes will affect primary production (PP) remains unclear as mixing influences the two controlling factors: light and iron. We used a large ensemble of 1‐D‐biogeochemical model simulations to explore the impacts of changes in mixed‐layer depths on PP in the Southern Ocean. In summer, shoaling mixed‐layer depth always reduced depth‐integrated PP, despite increasing production rates. In winter, shoaling mixed layers had a two‐staged impact: for moderate shoaling PP increased as light conditions improved, but more pronounced shoaling decreased iron supply, which reduced PP. The fraction of PP exported below 100 m also presented a nonmonotonic behavior. This suggests a potential future shift from a situation where reduced winter mixing increases PP and export, to a situation where PP and export may collapse if the ML shoals above a threshold depth. Article in Journal/Newspaper Southern Ocean Université de Nantes: HAL-UNIV-NANTES Southern Ocean Geophysical Research Letters 46 6 3368 3377 |