Iron from a submarine source impacts the productive layer of the Western Tropical South Pacific (WTSP)

Abstract In the Western Tropical South Pacific, patches of high chlorophyll concentrations linked to the occurrence of N2-fixing organisms are found in the vicinity of volcanic islands. The survival of these organisms relies on a high bioavailable iron supply whose origin and fluxes remain unknown....

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Autores principales:	Cécile Guieu, Sophie Bonnet, Anne Petrenko, Christophe Menkes, Valérie Chavagnac, Karine Desboeufs, Christophe Maes, Thierry Moutin
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/8d047e9d0eda47d29fff4a0cb420ff7a
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spelling	oai:doaj.org-article:8d047e9d0eda47d29fff4a0cb420ff7a2021-12-02T15:08:17ZIron from a submarine source impacts the productive layer of the Western Tropical South Pacific (WTSP)10.1038/s41598-018-27407-z2045-2322https://doaj.org/article/8d047e9d0eda47d29fff4a0cb420ff7a2018-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-27407-zhttps://doaj.org/toc/2045-2322Abstract In the Western Tropical South Pacific, patches of high chlorophyll concentrations linked to the occurrence of N2-fixing organisms are found in the vicinity of volcanic islands. The survival of these organisms relies on a high bioavailable iron supply whose origin and fluxes remain unknown. Here, we measured high dissolved iron (DFe) concentrations (up to 66 nM) in the euphotic layer, extending zonally over 10 degrees longitude (174 E−175 W) at ∼20°S latitude. DFe atmospheric fluxes were at the lower end of reported values of the remote ocean and could not explain the high DFe concentrations measured in the water column in the vicinity of Tonga. We argue that the high DFe concentrations may be sustained by a submarine source, also characterized by freshwater input and recorded as salinity anomalies by Argo float in situ measurements and atlas data. The observed negative salinity anomalies are reproduced by simulations from a general ocean circulation model. Submarine iron sources reaching the euphotic layer may impact nitrogen fixation across the whole region.Cécile GuieuSophie BonnetAnne PetrenkoChristophe MenkesValérie ChavagnacKarine DesboeufsChristophe MaesThierry MoutinNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-9 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Cécile Guieu Sophie Bonnet Anne Petrenko Christophe Menkes Valérie Chavagnac Karine Desboeufs Christophe Maes Thierry Moutin Iron from a submarine source impacts the productive layer of the Western Tropical South Pacific (WTSP)
description	Abstract In the Western Tropical South Pacific, patches of high chlorophyll concentrations linked to the occurrence of N2-fixing organisms are found in the vicinity of volcanic islands. The survival of these organisms relies on a high bioavailable iron supply whose origin and fluxes remain unknown. Here, we measured high dissolved iron (DFe) concentrations (up to 66 nM) in the euphotic layer, extending zonally over 10 degrees longitude (174 E−175 W) at ∼20°S latitude. DFe atmospheric fluxes were at the lower end of reported values of the remote ocean and could not explain the high DFe concentrations measured in the water column in the vicinity of Tonga. We argue that the high DFe concentrations may be sustained by a submarine source, also characterized by freshwater input and recorded as salinity anomalies by Argo float in situ measurements and atlas data. The observed negative salinity anomalies are reproduced by simulations from a general ocean circulation model. Submarine iron sources reaching the euphotic layer may impact nitrogen fixation across the whole region.
format	article
author	Cécile Guieu Sophie Bonnet Anne Petrenko Christophe Menkes Valérie Chavagnac Karine Desboeufs Christophe Maes Thierry Moutin
author_facet	Cécile Guieu Sophie Bonnet Anne Petrenko Christophe Menkes Valérie Chavagnac Karine Desboeufs Christophe Maes Thierry Moutin
author_sort	Cécile Guieu
title	Iron from a submarine source impacts the productive layer of the Western Tropical South Pacific (WTSP)
title_short	Iron from a submarine source impacts the productive layer of the Western Tropical South Pacific (WTSP)
title_full	Iron from a submarine source impacts the productive layer of the Western Tropical South Pacific (WTSP)
title_fullStr	Iron from a submarine source impacts the productive layer of the Western Tropical South Pacific (WTSP)
title_full_unstemmed	Iron from a submarine source impacts the productive layer of the Western Tropical South Pacific (WTSP)
title_sort	iron from a submarine source impacts the productive layer of the western tropical south pacific (wtsp)
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/8d047e9d0eda47d29fff4a0cb420ff7a
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Iron from a submarine source impacts the productive layer of the Western Tropical South Pacific (WTSP)

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