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    Cadmium and phosphate in coastal Antarctic seawater : implications for Southern Ocean nutrient cycling

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    hendry2009b.pdf (481.7Kb)
    Date
    2008-09
    Author
    Hendry, Katharine R.  Concept link
    Rickaby, Rosalind E. M.  Concept link
    de Hoog, Jan C. M.  Concept link
    Weston, Keith  Concept link
    Rehkamper, Mark  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4822
    As published
    https://doi.org/10.1016/j.marchem.2008.09.004
    Keyword
     Cadmium; Phosphate; Coastal; Nutrients; Southern Ocean 
    Abstract
    Cadmium is a biologically important trace metal that co-varies with phosphate (PO43- or Dissolved Inorganic Phosphate, DIP) in seawater. However, the exact nature of Cd uptake mechanisms and the relationship with phosphate and other nutrients in global oceans remains elusive. Here, we present a time series study of Cd and PO43- from coastal Antarctic seawater, showing that Cd co-varies with macronutrients during times of high biological activity even under nutrient and trace metal replete conditions. Our data imply that Cd/PO43- in coastal surface Antarctic seawater is higher than open ocean areas. Furthermore, the sinking of some proportion of this high Cd/PO43- water into Antarctic Bottom Water, followed by mixing into Circumpolar Deep Water, impacts Southern Ocean preformed nutrient and trace metal composition. A simple model of endmember water mass mixing with a particle fractionation of Cd/P (αCd-P) determined by the local environment can be used to account for the Cd/PO43- relationship in different parts of the ocean. The high Cd/PO43- of the coastal water is a consequence of two factors: the high input from terrestrial and continental shelf sediments and changes in biological fractionation with respect to P during uptake of Cd in regions of high Fe and Zn. This implies that the Cd/PO43- ratio of the Southern Ocean will vary on glacial-interglacial timescales as the proportion of deep water originating on the continental shelves of the Weddell Sea is reduced during glaciations because the ice shelf is pinned at the edge of the continental shelf. There could also be variations in biological fractionation of Cd/P in the surface waters of the Southern Ocean on these timescales as a result of changes in atmospheric inputs of trace metals. Further variations in the relationship between Cd and PO43- in seawater arise from changes in population structure and community requirements for macro- and micronutrients.
    Description
    Author Posting. © The Author(s), 2008. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Marine Chemistry 112 (2008): 149-157, doi:10.1016/j.marchem.2008.09.004.
    Collections
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Preprint: Hendry, Katharine R., Rickaby, Rosalind E. M., de Hoog, Jan C. M., Weston, Keith, Rehkamper, Mark, "Cadmium and phosphate in coastal Antarctic seawater : implications for Southern Ocean nutrient cycling", 2008-09, https://doi.org/10.1016/j.marchem.2008.09.004, https://hdl.handle.net/1912/4822
     

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