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Nitrous oxide as a function of oxygen and archaeal gene abundance in the North Pacific

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  • Mark Trimmer

    (School of Biological and Chemical Sciences, Queen Mary University of London)

  • Panagiota-Myrsini Chronopoulou

    (School of Biological and Chemical Sciences, Queen Mary University of London)

  • Susanna T. Maanoja

    (School of Biological and Chemical Sciences, Queen Mary University of London)

  • Robert C. Upstill-Goddard

    (School of Marine Science and Technology, Ridley Building, University of Newcastle)

  • Vassilis Kitidis

    (Plymouth Marine Laboratory, Prospect Place)

  • Kevin J. Purdy

    (School of Life Sciences, University of Warwick)

Abstract

Oceanic oxygen minimum zones are strong sources of the potent greenhouse gas N2O but its microbial source is unclear. We characterized an exponential response in N2O production to decreasing oxygen between 1 and 30 μmol O2 l−1 within and below the oxycline using 15NO2−, a relationship that held along a 550 km offshore transect in the North Pacific. Differences in the overall magnitude of N2O production were accounted for by archaeal functional gene abundance. A one-dimensional (1D) model, parameterized with our experimentally derived exponential terms, accurately reproduces N2O profiles in the top 350 m of water column and, together with a strong 45N2O signature indicated neither canonical nor nitrifier–denitrification production while statistical modelling supported production by archaea, possibly via hybrid N2O formation. Further, with just archaeal N2O production, we could balance high-resolution estimates of sea-to-air N2O exchange. Hence, a significant source of N2O, previously described as leakage from bacterial ammonium oxidation, is better described by low-oxygen archaeal production at the oxygen minimum zone’s margins.

Suggested Citation

  • Mark Trimmer & Panagiota-Myrsini Chronopoulou & Susanna T. Maanoja & Robert C. Upstill-Goddard & Vassilis Kitidis & Kevin J. Purdy, 2016. "Nitrous oxide as a function of oxygen and archaeal gene abundance in the North Pacific," Nature Communications, Nature, vol. 7(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13451
    DOI: 10.1038/ncomms13451
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    Cited by:

    1. Ye, X.H. & Han, B. & Li, W. & Zhang, X.C. & Zhang, Y.L. & Lin, X.G. & Zou, H.T., 2018. "Effects of different irrigation methods on nitrous oxide emissions and ammonia oxidizers microorganisms in greenhouse tomato fields," Agricultural Water Management, Elsevier, vol. 203(C), pages 115-123.
    2. Mohammad Bahram & Mikk Espenberg & Jaan Pärn & Laura Lehtovirta-Morley & Sten Anslan & Kuno Kasak & Urmas Kõljalg & Jaan Liira & Martin Maddison & Mari Moora & Ülo Niinemets & Maarja Öpik & Meelis Pär, 2022. "Structure and function of the soil microbiome underlying N2O emissions from global wetlands," Nature Communications, Nature, vol. 13(1), pages 1-10, December.

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