Widespread nitrous oxide undersaturation in farm waterbodies creates an unexpected greenhouse gas sink

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dc.contributor.authorWebb, Jackie R.
dc.contributor.authorHayes, Nicole M.
dc.contributor.authorSimpson, Gavin L.
dc.contributor.authorLeavitt, Peter R.
dc.contributor.authorBaulch, Helen M.
dc.contributor.authorFinlay, Kerri
dc.date.accessioned2023-04-28T19:30:09Z
dc.date.available2023-04-28T19:30:09Z
dc.date.issued2019-05-14
dc.descriptionCopyright © 2019 the Author(s). Published by PNAS. This open access article is distributed under Creative Commons Attribution License 4.0 (CC BY).en_US
dc.description.abstractNitrogen pollution and global eutrophication are predicted to increase nitrous oxide (N2O) emissions from freshwater ecosystems. Surface waters within agricultural landscapes experience the full impact of these pressures and can contribute substantially to total landscape N2O emissions. However, N2O measurements to date have focused on flowing waters. Small artificial waterbodies remain greatly understudied in the context of agricultural N2O emissions. This study provides a regional analysis of N2O measurements in small (<0.01 km2) artificial reservoirs, of which an estimated 16 million exist globally. We show that 67% of reservoirs were N2O sinks (−12 to −2 μmol N2O⋅m−2⋅d−1) in Canada’s largest agricultural area, despite their highly eutrophic status [99 ± 289 µg⋅L−1 chlorophyll-a (Chl-a)]. Generalized additive models indicated that in situ N2O concentrations were strongly and nonlinearly related to stratification strength and dissolved inorganic nitrogen content, with the lowest N2O levels under conditions of strong water column stability and high algal biomass. Predicted fluxes from previously published models based on lakes, reservoirs, and agricultural waters overestimated measured fluxes on average by 7- to 33-fold, challenging the widely held view that eutrophic N-enriched waters are sources of N2O.en_US
dc.description.authorstatusFacultyen_US
dc.description.peerreviewyesen_US
dc.description.sponsorshiphis research was funded by the Government of Saskatchewan through an Agriculture Development Fund (Award 200160015), Natural Sciences and Engineering Research Council of Canada Discovery grants (to K.F., G.L.S., H.M.B., and P.R.L.), the Canada Foundation for Innovation, University of Regina, and Queen’s University Belfast.en_US
dc.identifier.citationWebb, J.R., N.M. Hayes, G.L. Simpson, P.R. Leavitt, H.M. Baulch, and K. Finlay. 2019. Widespread nitrous oxide undersaturation in farm waterbodies creates an unexpected greenhouse gas sink. Proc. Nat. Acad. Sci. USA 116: 9814-9819. doi.org/10.1073/pnas.1820389116en_US
dc.identifier.doihttps://doi.org/10.1073/pnas.1820389116
dc.identifier.urihttps://hdl.handle.net/10294/15899
dc.language.isoenen_US
dc.publisherNational Academy of Sciencesen_US
dc.rightsAttribution 4.0 United States*
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/*
dc.titleWidespread nitrous oxide undersaturation in farm waterbodies creates an unexpected greenhouse gas sinken_US
dc.typeArticleen_US
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