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Hydrothermal vents trigger massive phytoplankton blooms in the Southern Ocean

Author

Listed:
  • Mathieu Ardyna

    (Laboratoire d’Océanographie de Villefranche (LOV)
    Stanford University)

  • Léo Lacour

    (Laboratoire d’Océanographie de Villefranche (LOV)
    Département de biologie et Québec-Océan, Université Laval, Québec)

  • Sara Sergi

    (Laboratoire d’Océanographie et du Climat: Expérimentations et Approches Numériques (LOCEAN-IPSL))

  • Francesco d’Ovidio

    (Laboratoire d’Océanographie et du Climat: Expérimentations et Approches Numériques (LOCEAN-IPSL))

  • Jean-Baptiste Sallée

    (Laboratoire d’Océanographie et du Climat: Expérimentations et Approches Numériques (LOCEAN-IPSL))

  • Mathieu Rembauville

    (Laboratoire d’Océanographie de Villefranche (LOV))

  • Stéphane Blain

    (Laboratoire d’Océanographie Microbienne (LOMIC), Observatoire Océanologique)

  • Alessandro Tagliabue

    (School of Environmental Sciences, University of Liverpool)

  • Reiner Schlitzer

    (Helmholtz-Center for Polar- and Marine Research)

  • Catherine Jeandel

    (LEGOS (Université de Toulouse, CNRS, CNES, IRD, UPS))

  • Kevin Robert Arrigo

    (Stanford University)

  • Hervé Claustre

    (Laboratoire d’Océanographie de Villefranche (LOV))

Abstract

Hydrothermal activity is significant in regulating the dynamics of trace elements in the ocean. Biogeochemical models suggest that hydrothermal iron might play an important role in the iron-depleted Southern Ocean by enhancing the biological pump. However, the ability of this mechanism to affect large-scale biogeochemistry and the pathways by which hydrothermal iron reach the surface layer have not been observationally constrained. Here we present the first observational evidence of upwelled hydrothermally influenced deep waters stimulating massive phytoplankton blooms in the Southern Ocean. Captured by profiling floats, two blooms were observed in the vicinity of the Antarctic Circumpolar Current, downstream of active hydrothermal vents along the Southwest Indian Ridge. These hotspots of biological activity are supported by mixing of hydrothermally sourced iron stimulated by flow-topography interactions. Such findings reveal the important role of hydrothermal vents on surface biogeochemistry, potentially fueling local hotspot sinks for atmospheric CO2 by enhancing the biological pump.

Suggested Citation

  • Mathieu Ardyna & Léo Lacour & Sara Sergi & Francesco d’Ovidio & Jean-Baptiste Sallée & Mathieu Rembauville & Stéphane Blain & Alessandro Tagliabue & Reiner Schlitzer & Catherine Jeandel & Kevin Robert, 2019. "Hydrothermal vents trigger massive phytoplankton blooms in the Southern Ocean," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-09973-6
    DOI: 10.1038/s41467-019-09973-6
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    Cited by:

    1. Sebastien Moreau & Tore Hattermann & Laura Steur & Hanna M. Kauko & Heidi Ahonen & Murat Ardelan & Philipp Assmy & Melissa Chierici & Sebastien Descamps & Tilman Dinter & Tone Falkenhaug & Agneta Fran, 2023. "Wind-driven upwelling of iron sustains dense blooms and food webs in the eastern Weddell Gyre," Nature Communications, Nature, vol. 14(1), pages 1-12, December.
    2. Oleg Belyaev & Erica Sparaventi & Gabriel Navarro & Araceli Rodríguez-Romero & Antonio Tovar-Sánchez, 2023. "The contribution of penguin guano to the Southern Ocean iron pool," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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