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    Isotopic constraints on nitrogen transformation rates in the deep sedimentary marine biosphere

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    Article (1.905Mb)
    Date
    2018-10-18
    Author
    Buchwald, Carolyn  Concept link
    Homola, Kira  Concept link
    Spivack, Arthur J.  Concept link
    Estes, Emily R.  Concept link
    Wankel, Scott D.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/10812
    As published
    https://doi.org/10.1029/2018GB005948
    DOI
    10.1029/2018GB005948
    Abstract
    Little is known about the nature of microbial community activity contributing to the cycling of nitrogen in organic-poor sediments underlying the expansive oligotrophic ocean gyres. Here we use pore water concentrations and stable N and O isotope measurements of nitrate and nitrite to constrain rates of nitrogen cycling processes over a 34-m profile from the deep North Atlantic spanning fully oxic to anoxic conditions. Using a 1-D reaction-diffusion model to predict the distribution of nitrogen cycling rates, results converge on two distinct scenarios: (1) an exceptionally high degree of coupling between nitrite oxidation and nitrate reduction near the top of the anoxic zone or (2) an unusually large N isotope effect (~60‰) for nitrate reduction that is decoupled from the corresponding O isotope effect, which is possibly explained by enzyme-level interconversion between nitrite and nitrate.
    Description
    Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Isotopic constraints on nitrogen transformation rates in the deep sedimentary marine biosphere. Global Biogeochemical Cycles, 32, (2018):1688–1702., doi: 10.1029/2018GB005948.
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    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Buchwald, C., Homola, K., Spivack, A. J., Estes, E. R., Murray, R. W., & Wankel, S. D. (2018). Isotopic constraints on nitrogen transformation rates in the deep sedimentary marine biosphere. Global Biogeochemical Cycles, 32, 1688–1702.
     
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