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Nitrous oxide as a function of oxygen and archaeal gene abundance in the North Pacific
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Trimmer, Mark, Chronopoulou, Panagiota-Myrsini, Maanoja, Susanna T., Upstill-Goddard, Robert C., Kitidis, Vassilis and Purdy, Kevin J. (2016) Nitrous oxide as a function of oxygen and archaeal gene abundance in the North Pacific. Nature Communications, 7 . 13451. doi:10.1038/ncomms13451 ISSN 2041-1723.
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Official URL: http://dx.doi.org/10.1038/ncomms13451
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.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QH Natural history T Technology > TD Environmental technology. Sanitary engineering |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- ) | ||||||||
Library of Congress Subject Headings (LCSH): | Atmospheric nitrous oxide -- North Pacific Ocean, Greenhouse gases, Archaebacteria | ||||||||
Journal or Publication Title: | Nature Communications | ||||||||
Publisher: | Nature Publishing Group | ||||||||
ISSN: | 2041-1723 | ||||||||
Official Date: | 1 December 2016 | ||||||||
Dates: |
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Volume: | 7 | ||||||||
Article Number: | 13451 | ||||||||
DOI: | 10.1038/ncomms13451 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||
Date of first compliant deposit: | 22 November 2016 | ||||||||
Date of first compliant Open Access: | 6 December 2016 | ||||||||
Funder: | Natural Environment Research Council (Great Britain) (NERC) | ||||||||
Grant number: | NE/E01559X/1 |
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