A comprehensive quantification of global nitrous oxide sources and sinks

A comprehensive quantification of global nitrous oxide sources and sinks

2020 | Tian, Hanqin; 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, Naqing; Pan, Shufen; Peters, Glen P.; Shi, Hao; Tubiello, Francesco N.; Zaehle, Sönke; Zhou, Feng; Arneth, Almut
The study presents a comprehensive quantification of global nitrous oxide (N₂O) sources and sinks, incorporating both natural and anthropogenic contributions. Using bottom-up and top-down approaches, the researchers estimated global N₂O emissions between 1980 and 2016, finding that global emissions were 17.0 teragrams of nitrogen per year (bottom-up) and 16.9 teragrams of nitrogen per year (top-down) between 2007 and 2016. The increase in human-induced emissions, primarily from nitrogen additions to croplands, was responsible for 30% of the growth in atmospheric N₂O concentrations. The study highlights growing N₂O emissions in emerging economies, particularly Brazil, China, and India, and identifies complex interactions between N₂O fluxes and human-driven changes, such as climate change, increasing atmospheric CO₂, and deforestation. The findings underscore the urgency to mitigate N₂O emissions to align with the long-term goal of the Paris Agreement.The study presents a comprehensive quantification of global nitrous oxide (N₂O) sources and sinks, incorporating both natural and anthropogenic contributions. Using bottom-up and top-down approaches, the researchers estimated global N₂O emissions between 1980 and 2016, finding that global emissions were 17.0 teragrams of nitrogen per year (bottom-up) and 16.9 teragrams of nitrogen per year (top-down) between 2007 and 2016. The increase in human-induced emissions, primarily from nitrogen additions to croplands, was responsible for 30% of the growth in atmospheric N₂O concentrations. The study highlights growing N₂O emissions in emerging economies, particularly Brazil, China, and India, and identifies complex interactions between N₂O fluxes and human-driven changes, such as climate change, increasing atmospheric CO₂, and deforestation. The findings underscore the urgency to mitigate N₂O emissions to align with the long-term goal of the Paris Agreement.
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