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

Mark Trimmer (), Panagiota-Myrsini Chronopoulou, Susanna T. Maanoja, Robert C. Upstill-Goddard, Vassilis Kitidis and Kevin J. Purdy
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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

Nature Communications, 2016, vol. 7, issue 1, 1-10

Abstract: 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.

Date: 2016
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DOI: 10.1038/ncomms13451

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