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Isotopic partitioning of gaseous nitrogen emissions of natural terrestrial ecosystems

par Feng, Maoyuan ;Liu, Gang;Wang, Yilong;Chang, Jinfeng;Peng, Shushi
Référence Environmental Research Letters, 20, 3, 034053
Publication Publié, 2025-03

Article révisé par les pairs

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Résumé :

We estimated the emissions of different forms of gaseous nitrogen (N) from natural terrestrial ecosystems using newly upscaled soil δ15N maps, data-constrained gas partitioning models, and incorporating the previously missing N input flux from rock weathering. The emissions for nitrous oxide (N2O), nitric oxide (NO) and dinitrogen (N2) are estimated at 12 ± 3, 19 ± 4, and 12 ± 3 Tg N yr−1, respectively. The Sixth Phase of Coupled Intercomparison Model Project (CMIP6) models tend to overestimate total gaseous N emissions and thus N2O emissions. Correcting these total gaseous N emissions to match soil δ15N maps and applying gas partitioning models, the CMIP6 models’ N2O emission estimates drop to 7 ± 2 Tg N yr−1, consistent with this study and N2O Model Intercomparison Project 2. Differences in gas partitioning models also contribute significantly to uncertainties in N2O emission estimates. This study underscores the need for improved modeling of gaseous N emissions and partitioning in CMIP6 models to better understand the responses and feedbacks of terrestrial ecosystems to climate change.