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    Humic substances may control dissolved iron distributions in the global ocean : implications from numerical simulations

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    gbc20039.pdf (4.619Mb)
    Date
    2013-05-20
    Author
    Misumi, Kazuhiro  Concept link
    Lindsay, Keith  Concept link
    Moore, J. Keith  Concept link
    Doney, Scott C.  Concept link
    Tsumune, Daisuke  Concept link
    Yoshida, Yoshikatsu  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/6204
    As published
    https://doi.org/10.1002/gbc.20039
    DOI
    10.1002/gbc.20039
    Keyword
     Iron; Organic ligands; General circulation model 
    Abstract
    This study used an ocean general circulation model to simulate the marine iron cycle in an investigation of how simulated distributions of weak iron-binding ligands would be expected to control dissolved iron concentrations in the ocean, with a particular focus on deep ocean waters. The distribution of apparent oxygen utilization was used as a proxy for humic substances that have recently been hypothesized to account for the bulk of weak iron-binding ligands in seawater. Compared to simulations using a conventional approach with homogeneous ligand distributions, the simulations that incorporated spatially variable ligand concentrations exhibited substantial improvement in the simulation of global dissolved iron distributions as revealed by comparisons with available field data. The improved skill of the simulations resulted largely because the spatially variable ligand distributions led to a more reasonable basin-scale variation of the residence time of iron when present at high concentrations. The model results, in conjunction with evidence from recent field studies, suggest that humic substances play an important role in the iron cycle in the ocean.
    Description
    Author Posting. © American Geophysical Union, 2013. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 27 (2013): 450-462, doi:10.1002/gbc.20039.
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    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Global Biogeochemical Cycles 27 (2013): 450-462
     

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