Nitrous oxide emissions are enhanced in a warmer and wetter world

Proceedings of the National Academy of Sciences of the United States of America
Timothy J GriffisPeter A Turner

Abstract

Nitrous oxide (N2O) has a global warming potential that is 300 times that of carbon dioxide on a 100-y timescale, and is of major importance for stratospheric ozone depletion. The climate sensitivity of N2O emissions is poorly known, which makes it difficult to project how changing fertilizer use and climate will impact radiative forcing and the ozone layer. Analysis of 6 y of hourly N2O mixing ratios from a very tall tower within the US Corn Belt-one of the most intensive agricultural regions of the world-combined with inverse modeling, shows large interannual variability in N2O emissions (316 Gg N2O-N⋅y-1 to 585 Gg N2O-N⋅y-1). This implies that the regional emission factor is highly sensitive to climate. In the warmest year and spring (2012) of the observational period, the emission factor was 7.5%, nearly double that of previous reports. Indirect emissions associated with runoff and leaching dominated the interannual variability of total emissions. Under current trends in climate and anthropogenic N use, we project a strong positive feedback to warmer and wetter conditions and unabated growth of regional N2O emissions that will exceed 600 Gg N2O-N⋅y-1, on average, by 2050. This increasing emission trend in the US Corn Belt m...Continue Reading

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Jul 29, 2015·Proceedings of the National Academy of Sciences of the United States of America·Peter A TurnerJeffrey D Wood
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Citations

Sep 29, 2019·International Journal of Molecular Sciences·Sungmin HwangJulie A Maupin-Furlow
Jul 8, 2020·Proceedings of the National Academy of Sciences of the United States of America·Brianna M Loeks-Johnson, James B Cotner
Apr 4, 2019·Nature Communications·Sian Kou-Giesbrecht, Duncan Menge
Feb 1, 2018·Journal of Geophysical Research. Biogeosciences·Zichong ChenRandall K Kolka
Mar 20, 2021·The Science of the Total Environment·Qitao XiaoXuhui Lee
Mar 25, 2021·Environmental Science & Technology·Solianna A HerreraSally E Pusede
Jan 8, 2020·The Science of the Total Environment·Blanca González-MéndezChristina Siebe
Sep 24, 2021·Scientific Reports·Monika Suchowska-Kisielewicz, Ireneusz Nowogoński
Sep 28, 2021·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Euan G NisbetNicola J Warwick
Dec 11, 2021·The Science of the Total Environment·Yanhong XieXuhui Lee

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