The Biological Pump and Seasonal Variability of pCO 2 in the Southern Ocean: Exploring the Role of Diatom Adaptation to Low Iron
International audience Iron is known to limit primary production in the Southern Ocean (SO). To cope with the lack of this micronutrient, diatoms, a dominant phytoplankton group in this oceanic region, have been shown in cultures to have developed an original adaptation strategy to maintain efficien...
Published in: | Journal of Geophysical Research: Oceans |
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Main Authors: | , , |
Other Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2018
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Subjects: | |
Online Access: | https://hal.sorbonne-universite.fr/hal-01959020 https://hal.sorbonne-universite.fr/hal-01959020/document https://hal.sorbonne-universite.fr/hal-01959020/file/Person_et_al-2018-Journal_of_Geophysical_Research_Oceans_sans%20marque.pdf https://doi.org/10.1029/2018JC013775 |
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record_format |
openpolar |
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Open Polar |
collection |
HAL Sorbonne Université |
op_collection_id |
ftsorbonneuniv |
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 Person, Renaud Aumont, Olivier Lévy, Marina The Biological Pump and Seasonal Variability of pCO 2 in the Southern Ocean: Exploring the Role of Diatom Adaptation to Low Iron |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience Iron is known to limit primary production in the Southern Ocean (SO). To cope with the lack of this micronutrient, diatoms, a dominant phytoplankton group in this oceanic region, have been shown in cultures to have developed an original adaptation strategy to maintain efficient growth rates despite very low cellular iron quotas, even in low light conditions. Using a global ocean biogeochemical model, we explored the consequences of this physiological adaptation for the biological pump and the seasonal variability of both surface chlorophyll concentrations and surface partial pressure of carbon dioxide (pCO 2 ) in this key region for global climate. In the model, we implemented a low intracellular Fe:C requirement in the SO for diatoms uniquely. This results in an increase of 10% in the relative contribution of diatoms to total SO primary production. The biological pump is also strengthened, which increases the biological contribution to the seasonal evolution of pCO 2 relative to the thermodynamic component. Therefore, the seasonal evolution of both surface chlorophyll and surface pCO 2 is significantly impacted, with a marked improvement, in our model, in the SO polar zone compared to the observations. Our model study underscores the potentially important consequences that this adaptive physiological behavior of diatoms could have on marine biogeochemistry in the SO. It is thus critical to improve our understanding of the physiology of this key phytoplankton group, in particular in the SO. |
author2 |
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) Nucleus for European Modeling of the Ocean (NEMO R&D ) 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) European Project: 641816,H2020,H2020-SC5-2014-two-stage,CRESCENDO(2015) |
format |
Article in Journal/Newspaper |
author |
Person, Renaud Aumont, Olivier Lévy, Marina |
author_facet |
Person, Renaud Aumont, Olivier Lévy, Marina |
author_sort |
Person, Renaud |
title |
The Biological Pump and Seasonal Variability of pCO 2 in the Southern Ocean: Exploring the Role of Diatom Adaptation to Low Iron |
title_short |
The Biological Pump and Seasonal Variability of pCO 2 in the Southern Ocean: Exploring the Role of Diatom Adaptation to Low Iron |
title_full |
The Biological Pump and Seasonal Variability of pCO 2 in the Southern Ocean: Exploring the Role of Diatom Adaptation to Low Iron |
title_fullStr |
The Biological Pump and Seasonal Variability of pCO 2 in the Southern Ocean: Exploring the Role of Diatom Adaptation to Low Iron |
title_full_unstemmed |
The Biological Pump and Seasonal Variability of pCO 2 in the Southern Ocean: Exploring the Role of Diatom Adaptation to Low Iron |
title_sort |
biological pump and seasonal variability of pco 2 in the southern ocean: exploring the role of diatom adaptation to low iron |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.sorbonne-universite.fr/hal-01959020 https://hal.sorbonne-universite.fr/hal-01959020/document https://hal.sorbonne-universite.fr/hal-01959020/file/Person_et_al-2018-Journal_of_Geophysical_Research_Oceans_sans%20marque.pdf https://doi.org/10.1029/2018JC013775 |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.sorbonne-universite.fr/hal-01959020 Journal of Geophysical Research. Oceans, 2018, 123 (5), pp.3204-3226. ⟨10.1029/2018JC013775⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2018JC013775 info:eu-repo/grantAgreement/EC/FP7/317699/EU/The role of Southern Ocean Carbon cycle under CLImate change/SOCCLI info:eu-repo/grantAgreement//641816/EU/Coordinated Research in Earth Systems and Climate: Experiments, kNowledge, Dissemination and Outreach/CRESCENDO hal-01959020 https://hal.sorbonne-universite.fr/hal-01959020 https://hal.sorbonne-universite.fr/hal-01959020/document https://hal.sorbonne-universite.fr/hal-01959020/file/Person_et_al-2018-Journal_of_Geophysical_Research_Oceans_sans%20marque.pdf doi:10.1029/2018JC013775 IRD: fdi:010073197 WOS: 000436111400005 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2018JC013775 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
123 |
container_issue |
5 |
container_start_page |
3204 |
op_container_end_page |
3226 |
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1799467293136125952 |
spelling |
ftsorbonneuniv:oai:HAL:hal-01959020v1 2024-05-19T07:48:54+00:00 The Biological Pump and Seasonal Variability of pCO 2 in the Southern Ocean: Exploring the Role of Diatom Adaptation to Low Iron Person, Renaud Aumont, Olivier Lévy, Marina 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) Nucleus for European Modeling of the Ocean (NEMO R&D ) 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) European Project: 641816,H2020,H2020-SC5-2014-two-stage,CRESCENDO(2015) 2018-05 https://hal.sorbonne-universite.fr/hal-01959020 https://hal.sorbonne-universite.fr/hal-01959020/document https://hal.sorbonne-universite.fr/hal-01959020/file/Person_et_al-2018-Journal_of_Geophysical_Research_Oceans_sans%20marque.pdf https://doi.org/10.1029/2018JC013775 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1029/2018JC013775 info:eu-repo/grantAgreement/EC/FP7/317699/EU/The role of Southern Ocean Carbon cycle under CLImate change/SOCCLI info:eu-repo/grantAgreement//641816/EU/Coordinated Research in Earth Systems and Climate: Experiments, kNowledge, Dissemination and Outreach/CRESCENDO hal-01959020 https://hal.sorbonne-universite.fr/hal-01959020 https://hal.sorbonne-universite.fr/hal-01959020/document https://hal.sorbonne-universite.fr/hal-01959020/file/Person_et_al-2018-Journal_of_Geophysical_Research_Oceans_sans%20marque.pdf doi:10.1029/2018JC013775 IRD: fdi:010073197 WOS: 000436111400005 info:eu-repo/semantics/OpenAccess ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.sorbonne-universite.fr/hal-01959020 Journal of Geophysical Research. Oceans, 2018, 123 (5), pp.3204-3226. ⟨10.1029/2018JC013775⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2018 ftsorbonneuniv https://doi.org/10.1029/2018JC013775 2024-04-25T04:08:13Z International audience Iron is known to limit primary production in the Southern Ocean (SO). To cope with the lack of this micronutrient, diatoms, a dominant phytoplankton group in this oceanic region, have been shown in cultures to have developed an original adaptation strategy to maintain efficient growth rates despite very low cellular iron quotas, even in low light conditions. Using a global ocean biogeochemical model, we explored the consequences of this physiological adaptation for the biological pump and the seasonal variability of both surface chlorophyll concentrations and surface partial pressure of carbon dioxide (pCO 2 ) in this key region for global climate. In the model, we implemented a low intracellular Fe:C requirement in the SO for diatoms uniquely. This results in an increase of 10% in the relative contribution of diatoms to total SO primary production. The biological pump is also strengthened, which increases the biological contribution to the seasonal evolution of pCO 2 relative to the thermodynamic component. Therefore, the seasonal evolution of both surface chlorophyll and surface pCO 2 is significantly impacted, with a marked improvement, in our model, in the SO polar zone compared to the observations. Our model study underscores the potentially important consequences that this adaptive physiological behavior of diatoms could have on marine biogeochemistry in the SO. It is thus critical to improve our understanding of the physiology of this key phytoplankton group, in particular in the SO. Article in Journal/Newspaper Southern Ocean HAL Sorbonne Université Journal of Geophysical Research: Oceans 123 5 3204 3226 |