Data/hora: 02/06/2024 18:48:56

Provedor de dados: | 5
País: | France
Título: | The Biological Pump and Seasonal Variability of pCO(2) in the Southern Ocean: Exploring the Role of Diatom Adaptation to Low Iron
Autores: | Person, Roland; Aumont, Olivier; Levy, M.
Data: | 2018-05
Ano: | 2018
Palavras-chave: | Southern Ocean; Diatoms; Physiological adaptation; Biological pump; PCO(2); Seasonal variability.
Resumo: | 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.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00673/78490/80817.pdf

DOI:10.1029/2018JC013775

https://archimer.ifremer.fr/doc/00673/78490/

Editor: | Amer Geophysical Union

Relação:

info:eu-repo/grantAgreement/EC/FP7/641816/EU//CRESCENDO

info:eu-repo/grantAgreement/EC/FP7/317699/EU//SOCCLI

Formato: | application/pdf
Fonte: | Journal Of Geophysical Research-oceans (2169-9275) (Amer Geophysical Union), 2018-05 , Vol. 123 , N. 5 , P. 3204-3226

Fonte:

info:eu-repo/semantics/openAccess

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