The Biological Pump and Seasonal Variability of pCO(2) in the Southern Ocean: Exploring the Role of Diatom Adaptation to Low Iron
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...
Published in: | Journal of Geophysical Research: Oceans |
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Online Access: | https://doi.org/10.1029/2018JC013775 https://archimer.ifremer.fr/doc/00673/78490/80817.pdf https://archimer.ifremer.fr/doc/00673/78490/ |
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fttriple:oai:gotriple.eu:10670/1.eluogg 2023-05-15T18:25:08+02:00 The Biological Pump and Seasonal Variability of pCO(2) in the Southern Ocean: Exploring the Role of Diatom Adaptation to Low Iron Person, Roland Aumont, Olivier Levy, M. https://doi.org/10.1029/2018JC013775 https://archimer.ifremer.fr/doc/00673/78490/80817.pdf https://archimer.ifremer.fr/doc/00673/78490/ en eng Amer Geophysical Union doi:10.1029/2018JC013775 10670/1.eluogg https://archimer.ifremer.fr/doc/00673/78490/80817.pdf https://archimer.ifremer.fr/doc/00673/78490/ Archimer, archive institutionnelle de l'Ifremer Journal Of Geophysical Research-oceans (2169-9275) (Amer Geophysical Union), 2018-05 , Vol. 123 , N. 5 , P. 3204-3226 envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.1029/2018JC013775 2023-01-22T17:01:46Z 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. Text Southern Ocean Unknown Southern Ocean Journal of Geophysical Research: Oceans 123 5 3204 3226 |
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envir geo Person, Roland Aumont, Olivier Levy, M. The Biological Pump and Seasonal Variability of pCO(2) in the Southern Ocean: Exploring the Role of Diatom Adaptation to Low Iron |
topic_facet |
envir geo |
description |
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. |
format |
Text |
author |
Person, Roland Aumont, Olivier Levy, M. |
author_facet |
Person, Roland Aumont, Olivier Levy, M. |
author_sort |
Person, Roland |
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 |
Amer Geophysical Union |
url |
https://doi.org/10.1029/2018JC013775 https://archimer.ifremer.fr/doc/00673/78490/80817.pdf https://archimer.ifremer.fr/doc/00673/78490/ |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Archimer, archive institutionnelle de l'Ifremer Journal Of Geophysical Research-oceans (2169-9275) (Amer Geophysical Union), 2018-05 , Vol. 123 , N. 5 , P. 3204-3226 |
op_relation |
doi:10.1029/2018JC013775 10670/1.eluogg https://archimer.ifremer.fr/doc/00673/78490/80817.pdf https://archimer.ifremer.fr/doc/00673/78490/ |
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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1766206352458252288 |