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

Cecile Guieu, Sophie Bonnet, Anne Petrenko, Christophe Menkes, Valérie Chavagnac, Karine Desboeufs, Christophe Maes, Thierry Moutin

    Research output: Contribution to journalArticle

    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.

    Original languageEnglish (US)
    Article number9075
    JournalScientific Reports
    Volume8
    Issue number1
    DOIs
    StatePublished - Dec 1 2018

    Fingerprint

    iron
    anomaly
    salinity
    Argo
    freshwater input
    volcanic island
    nitrogen fixation
    atlas
    in situ measurement
    chlorophyll
    water column
    ocean
    simulation
    impact source
    organism
    longitude
    ocean circulation

    ASJC Scopus subject areas

    • General

    Cite this

    Guieu, C., Bonnet, S., Petrenko, A., Menkes, C., Chavagnac, V., Desboeufs, K., ... Moutin, T. (2018). Iron from a submarine source impacts the productive layer of the Western Tropical South Pacific (WTSP). Scientific Reports, 8(1), [9075]. https://doi.org/10.1038/s41598-018-27407-z

    Iron from a submarine source impacts the productive layer of the Western Tropical South Pacific (WTSP). / Guieu, Cecile; Bonnet, Sophie; Petrenko, Anne; Menkes, Christophe; Chavagnac, Valérie; Desboeufs, Karine; Maes, Christophe; Moutin, Thierry.

    In: Scientific Reports, Vol. 8, No. 1, 9075, 01.12.2018.

    Research output: Contribution to journalArticle

    Guieu, C, Bonnet, S, Petrenko, A, Menkes, C, Chavagnac, V, Desboeufs, K, Maes, C & Moutin, T 2018, 'Iron from a submarine source impacts the productive layer of the Western Tropical South Pacific (WTSP)', Scientific Reports, vol. 8, no. 1, 9075. https://doi.org/10.1038/s41598-018-27407-z
    Guieu, Cecile ; Bonnet, Sophie ; Petrenko, Anne ; Menkes, Christophe ; Chavagnac, Valérie ; Desboeufs, Karine ; Maes, Christophe ; Moutin, Thierry. / Iron from a submarine source impacts the productive layer of the Western Tropical South Pacific (WTSP). In: Scientific Reports. 2018 ; Vol. 8, No. 1.
    @article{85322594aab84026b0b1bf56953d1d6c,
    title = "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. 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.",
    author = "Cecile Guieu and Sophie Bonnet and Anne Petrenko and Christophe Menkes and Val{\'e}rie Chavagnac and Karine Desboeufs and Christophe Maes and Thierry Moutin",
    year = "2018",
    month = "12",
    day = "1",
    doi = "10.1038/s41598-018-27407-z",
    language = "English (US)",
    volume = "8",
    journal = "Scientific Reports",
    issn = "2045-2322",
    publisher = "Nature Publishing Group",
    number = "1",

    }

    TY - JOUR

    T1 - Iron from a submarine source impacts the productive layer of the Western Tropical South Pacific (WTSP)

    AU - Guieu, Cecile

    AU - Bonnet, Sophie

    AU - Petrenko, Anne

    AU - Menkes, Christophe

    AU - Chavagnac, Valérie

    AU - Desboeufs, Karine

    AU - Maes, Christophe

    AU - Moutin, Thierry

    PY - 2018/12/1

    Y1 - 2018/12/1

    N2 - 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.

    AB - 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.

    UR - http://www.scopus.com/inward/record.url?scp=85047327575&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=85047327575&partnerID=8YFLogxK

    U2 - 10.1038/s41598-018-27407-z

    DO - 10.1038/s41598-018-27407-z

    M3 - Article

    VL - 8

    JO - Scientific Reports

    JF - Scientific Reports

    SN - 2045-2322

    IS - 1

    M1 - 9075

    ER -