Isotopic partitioning of gaseous nitrogen emissions of natural terrestrial ecosystems

We estimated the emissions of different forms of gaseous nitrogen (N) from natural terrestrial ecosystems using newly upscaled soil δ 15 N maps, data-constrained gas partitioning models, and incorporating the previously missing N input flux from rock weathering. The emissions for nitrous oxide (N 2 O), nitric oxide (NO) and dinitrogen (N 2 ) 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 N 2 O emissions. Correcting these total gaseous N emissions to match soil δ 15 N maps and applying gas partitioning models, the CMIP6 models’ N 2 O emission estimates drop to 7 ± 2 Tg N yr −1 , consistent with this study and N 2 O Model Intercomparison Project 2. Differences in gas partitioning models also contribute significantly to uncertainties in N 2 O 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

Atmospheric sciences · Biology · Earth science · Ecosystem · Natural (archaeology · Nitrogen · Terrestrial ecosystem · Atmospheric and Environmental Gas Dynamics · Chemistry · Environmental Science · Geology and Paleoclimatology Research · Isotope Analysis in Ecology · Ecology · Environmental Chemistry · Geology

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