Journal article
Increasing sensitivity of terrestrial nitrous oxide emissions to precipitation variations
Y Huang, P Ciais, O Boucher, YP Wang, H Tian, F Zhou, J Chang, Z Li, DS Goll, R Langenfelds, H Shi, N Pan, HW Hu, SK Lam, N Dong
Environmental Research Climate | Published : 2022
Abstract
Nitrous oxide (N2O), a major greenhouse gas and ozone-depleting agent, is generated over land mostly from two key biochemical processes—nitrification and denitrification. Nitrifying and denitrifying N2O production occurs preferably under alternative oxic and anoxic conditions, which are closely linked with variations in water filled soil pores, and thus indirectly with precipitation. We show here that the interannual anomalies in the annual growth rate of the global land N2O emissions are significantly (P < 0.001) correlated with precipitation anomalies, with an overall sensitivity ( α PRE , changes of land N2O emission variations per precipitation anomalies) of 2.50 ± 0.98 Tg N2O-N per 100 ..
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Funding Acknowledgements
We acknowledge research groups and institutes provide atmospheric N2O inversions, process-based N2O modelings, atmospheric N2O measurements and climate datasets. We especially thank Rona L Thompson for providing publicly available atmospheric inversion datasets for N2O. P C, O B and Y H. This work benefited from the French state aid managed by the ANR under the 'Investissements d'avenir' programme with the reference ANR-16-CONV-0003. The LMDz modelling results were funded through the Copernicus Atmosphere Monitoring Service (https://atmosphere.copernicus.eu/), implemented by ECMWF on behalf of the European Commission, and were generated using computing resources from LSCE.