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    Nitrogen cycling in the secondary nitrite maximum of the eastern tropical North Pacific off Costa Rica

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    Buchwald_et_al-2015-Global_Biogeochemical_Cycles.pdf (1.724Mb)
    Date
    2015-12-15
    Author
    Buchwald, Carolyn  Concept link
    Santoro, Alyson E.  Concept link
    Stanley, Rachel H. R.  Concept link
    Casciotti, Karen L.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/7809
    As published
    https://doi.org/10.1002/2015GB005187
    DOI
    10.1002/2015GB005187
    Keyword
     Nitrite; Nitrate; Stable isotopes 
    Abstract
    Nitrite is a central intermediate in the marine nitrogen cycle and represents a critical juncture where nitrogen can be reduced to the less bioavailable N2 gas or oxidized to nitrate and retained in a more bioavailable form. We present an analysis of rates of microbial nitrogen transformations in the oxygen deficient zone (ODZ) within the eastern tropical North Pacific Ocean (ETNP). We determined rates using a novel one-dimensional model using the distribution of nitrite and nitrate concentrations, along with their natural abundance nitrogen (N) and oxygen (O) isotope profiles. We predict rate profiles for nitrate reduction, nitrite reduction, and nitrite oxidation throughout the ODZ, as well as the contributions of anammox to nitrite reduction and nitrite oxidation. Nitrate reduction occurs at a maximum rate of 25 nM d−1 at the top of the ODZ, at the same depth as the maximum rate of nitrite reduction, 15 nM d−1. Nitrite oxidation occurs at maximum rates of 10 nM d−1 above the secondary nitrite maximum, but also in the secondary nitrite maximum, within the ODZ. Anammox contributes to nitrite oxidation within the ODZ but cannot account for all of it. Nitrite oxidation within the ODZ that is not through anammox is also supported by microbial gene abundance profiles. Our results suggest the presence of nitrite oxidation within the ETNP ODZ, with implications for the distribution and physiology of marine nitrite-oxidizing bacteria, and for total nitrogen loss in the largest marine ODZ.
    Description
    Author Posting. © American Geophysical Union, 2015. 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 29 (2015): 2061–2081, doi:10.1002/2015GB005187.
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    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Article: Buchwald, Carolyn, Santoro, Alyson E., Stanley, Rachel H. R., Casciotti, Karen L., "Nitrogen cycling in the secondary nitrite maximum of the eastern tropical North Pacific off Costa Rica", Global Biogeochemical Cycles 29 (2015): 2061–2081, DOI:10.1002/2015GB005187, https://hdl.handle.net/1912/7809
     

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