Quantification of ikaite in Antarctic sea ice

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  • Michael Fischer
    Alfred Wegener Institute for Polar and Marine Research, Bremerhaven
  • David N. Thomas
  • Andreas Krell
    Alfred Wegener Institute for Polar and Marine Research, Bremerhaven
  • Gernot Nehrke
    Alfred Wegener Institute for Polar and Marine Research, Bremerhaven
  • Jörg Göttlicher
    Karlsruhe Institute of Technology
  • Louiza Norman
  • Klaus M. Meiners
    Australian Antarctic Division
  • Catherine Riaux-Gobin
    CRIOBE, CNRS-EPHE, Perpignan
  • Gerhard S. Dieckmann
    Alfred Wegener Institute for Polar and Marine Research, Bremerhaven
Calcium carbonate precipitation in sea ice is thought to potentially drive significant CO2 uptake by the ocean. However, little is known about the quantitative spatial and temporal distribution of CaCO3 within sea ice, although it is hypothesized that high quantities of dissolved organic matter and/or phosphate (common in sea ice) may inhibit its formation. In this quantitative study of hydrous calcium carbonate as ikaite, sea ice cores and brine samples were collected from pack and land fast sea ice between September and December 2007 during two expeditions, one in the East Antarctic sector and the other off Terre Adélie. Samples were analysed for CaCO3, salinity, dissolved organic carbon/nitrogen, inorganic phosphate, and total alkalinity. No relationship between these parameters and CaCO3 precipitation was evident. Ikaite was found mostly in the uppermost layers of sea ice with maximum concentrations of up to 126 mg ikaite per litre melted sea ice being measured, although both the temporal and horizontal spatial distributions of ikaite were highly heterogeneous. The precipitate was also found in the snow on top of the sea ice at some of the sampling locations.
Original languageEnglish
Pages (from-to)421-432
JournalAntarctic Science
Volume25
Issue number3
DOIs
Publication statusPublished - Jun 2013
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