A comprehensive quantification of global nitrous oxide sources and sinks

Tian, Hanquin, Xu, Rongting, Canadell, Josep G., Thompson, Rona L., Winiwarter, Wilfried, Suntharalingam, Parvadha, Davidson, Eric A., Ciais, Philippe, Jackson, Robert B., Janssens-Maenhout, Greet, Prather, Michael J., Regnier, Pierre, Pan, Naiqing, Pan, Shufen, Peters, Glen P., Shi, Hao, Tubiello, Francesco N., Zaehle, Sönke, Zhou, Feng, Arneth, Almut, Battaglia, Gianna, Berthet, Sarah, Bopp, Laurent, Bouwman, Alexander F., Buitenhuis, Erik ORCID: https://orcid.org/0000-0001-6274-5583, Chang, Jinfeng, Chipperfield, Martyn P., Dangal, Shree R. S., Dlugokencky, Edward J., Elkins, James W., Eyre, Bradley D., Fu, Bojie, Hall, Bradley, Ito, Akihiko, Joos, Fortunat, Krummel, Paul B., Landolfi, Angela, Laruelle, Goulven G., Lauerwald, Ronny, Li, Wei, Lienert, Sebastian, Maavara, Taylor, MacLeod, Michael, Millet, Dylan B., Olin, Stefan, Patra, Prabir K., Prinn, Ronald G., Raymond, Peter A., Ruiz, Daniel J., van der Werf, Guido R., Vuichard, Nicolas, Wang, Junjie, Weiss, Ray F., Wells, Kelley C., Wilson, Chris, Yang, Jia and Yao, Yuanzhi (2020) A comprehensive quantification of global nitrous oxide sources and sinks. Nature, 586 (7828). 248–256. ISSN 1476-4687

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Nitrous oxide (N2O), like carbon dioxide, is a long-lived greenhouse gas that accumulates in the atmosphere. Over the past 150 years, increasing atmospheric N2O concentrations have contributed to stratospheric ozone depletion1 and climate change2, with the current rate of increase estimated at 2 per cent per decade. Existing national inventories do not provide a full picture of N2O emissions, owing to their omission of natural sources and limitations in methodology for attributing anthropogenic sources. Here we present a global N2O inventory that incorporates both natural and anthropogenic sources and accounts for the interaction between nitrogen additions and the biochemical processes that control N2O emissions. We use bottom-up (inventory, statistical extrapolation of flux measurements, process-based land and ocean modelling) and top-down (atmospheric inversion) approaches to provide a comprehensive quantification of global N2O sources and sinks resulting from 21 natural and human sectors between 1980 and 2016. Global N2O emissions were 17.0 (minimum–maximum estimates: 12.2–23.5) teragrams of nitrogen per year (bottom-up) and 16.9 (15.9–17.7) teragrams of nitrogen per year (top-down) between 2007 and 2016. Global human-induced emissions, which are dominated by nitrogen additions to croplands, increased by 30% over the past four decades to 7.3 (4.2–11.4) teragrams of nitrogen per year. This increase was mainly responsible for the growth in the atmospheric burden. Our findings point to growing N2O emissions in emerging economies—particularly Brazil, China and India. Analysis of process-based model estimates reveals an emerging N2O–climate feedback resulting from interactions between nitrogen additions and climate change. The recent growth in N2O emissions exceeds some of the highest projected emission scenarios3,4, underscoring the urgency to mitigate N2O emissions.

Item Type: Article
Uncontrolled Keywords: sdg 13 - climate action ,/dk/atira/pure/sustainabledevelopmentgoals/climate_action
Faculty \ School: Faculty of Science > School of Environmental Sciences
UEA Research Groups: Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences
University of East Anglia Schools > Faculty of Science > Tyndall Centre for Climate Change Research
Faculty of Science > Research Centres > Tyndall Centre for Climate Change Research
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Depositing User: LivePure Connector
Date Deposited: 28 Oct 2020 01:14
Last Modified: 14 Jun 2023 18:34
URI: https://ueaeprints.uea.ac.uk/id/eprint/77446
DOI: 10.1038/s41586-020-2780-0


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