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Iron from a submarine source impacts the productive layer of the Western Tropical South Pacific (WTSP).
Guieu, Cécile; Bonnet, Sophie; Petrenko, Anne; Menkes, Christophe; Chavagnac, Valérie; Desboeufs, Karine; Maes, Christophe; Moutin, Thierry.
Afiliación
  • Guieu C; Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, LOV, F-06230, Villefranche-sur-mer, France. guieu@obs-vlfr.fr.
  • Bonnet S; The Center for Prototype Climate Modeling, New York University in Abu Dhabi, Abu Dhabi, UAE. guieu@obs-vlfr.fr.
  • Petrenko A; Aix Marseille Université, CNRS/Institut National des Sciences de l'Univers, Université de Toulon, Institut de Recherche pour le Développement, Observatoire des Sciences de l'Univers Pythéas, Mediterranean Institute of Oceanography (MIO), F-13288, Marseille, France.
  • Menkes C; Aix Marseille Université, CNRS/Institut National des Sciences de l'Univers, Université de Toulon, Institut de Recherche pour le Développement, Observatoire des Sciences de l'Univers Pythéas, Mediterranean Institute of Oceanography (MIO), F-13288, Marseille, France.
  • Chavagnac V; LOCEAN, Sorbonne Université, IRD/CNRS/MNHN, IRD, BP A5, 98848, Nouméa Cedex, New Caledonia.
  • Desboeufs K; Géosciences Environnement Toulouse, CNRS/UPS/IRD/CNES, Université de Toulouse, F-31400, Toulouse, France.
  • Maes C; Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), IPSL, Université Paris Est Créteil (UPEC), Université Paris Diderot (UPD), Créteil, France.
  • Moutin T; IRD/LOPS, IFREMER, CNRS, IUEM, University of Brest, Brest, France.
Sci Rep ; 8(1): 9075, 2018 06 13.
Article en En | MEDLINE | ID: mdl-29899568
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.

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Rep Año: 2018 Tipo del documento: Article País de afiliación: Francia Pais de publicación: Reino Unido

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Rep Año: 2018 Tipo del documento: Article País de afiliación: Francia Pais de publicación: Reino Unido