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...
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ftird:oai:ird.fr:fdi:010073197 2024-09-15T18:37:02+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, R. /Aumont, Olivier /Lévy, Marina OCEAN AUSTRAL 2018 https://www.documentation.ird.fr/hor/fdi:010073197 EN eng https://www.documentation.ird.fr/hor/fdi:010073197 oai:ird.fr:fdi:010073197 Person R., 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. 2018, 123 (5), p. 3204-3226 Southern Ocean diatoms physiological adaptation biological pump pCO(2) seasonal variability text 2018 ftird 2024-08-15T05:57:41Z 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 IRD (Institute de recherche pour le développement): Horizon |
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Open Polar |
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IRD (Institute de recherche pour le développement): Horizon |
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English |
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Southern Ocean diatoms physiological adaptation biological pump pCO(2) seasonal variability |
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Southern Ocean diatoms physiological adaptation biological pump pCO(2) seasonal variability Person, R. /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 |
Southern Ocean diatoms physiological adaptation biological pump pCO(2) seasonal variability |
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, R. /Aumont, Olivier /Lévy, Marina |
author_facet |
Person, R. /Aumont, Olivier /Lévy, Marina |
author_sort |
Person, R. |
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 |
publishDate |
2018 |
url |
https://www.documentation.ird.fr/hor/fdi:010073197 |
op_coverage |
OCEAN AUSTRAL |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
https://www.documentation.ird.fr/hor/fdi:010073197 oai:ird.fr:fdi:010073197 Person R., 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. 2018, 123 (5), p. 3204-3226 |
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1810481258277371904 |