• Acronyme :
  • Référence :
  • Domaine de recherche :
    Sciences de la Terre et de l'Univers
  • Région :
  • Site :
    Laboratoire d'océanographie microbienne
  • Responsable du projet :
    Blain Stéphane

Bioavailability of Iron contained in Nanoparticles of Glacial Origin

The southern Ocean is a key player for the control of atmospheric CO2 and therefore climate. However the biological pump of CO2 in this ocean is severely limited by the availability of iron for phytoplankton. But a few oasis exist where enhanced biological activity results from natural iron fertilization. These regions are excellent natural laboratories and the Plateau of Kerguelen and the waters extending eastward are a good example. BINGO aims to investigate a so far unexplored issue in this region: the role of glacier melting as iron source for the ocean. BINGO proposes a study focused on the Cook Ice Cap. The challenge will be to detect iron nanoparticles in the melting water of the glacier and to evaluate their bioavailability for phytoplankton. BINGO relies on an expedition at Kerguelen where we will first collect the particles in the vicinity of the Glacier Ampère and second we will test the availability of these particles for iron limited phytoplankton at Port aux Français. Investigation conducted both from a geochemical and biological perspectives will provide original results that will contribute to better understand the future of Southern Ocean considering accelerated melting of ice caps.