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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
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.
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.
Isotopic partitioning of gaseous nitrogen emissions of natural terrestrial ecosystems
Maoyuan Feng (Autor:in) / Gang Liu (Autor:in) / Yilong Wang (Autor:in) / Jinfeng Chang (Autor:in) / Shushi Peng (Autor:in)
2025
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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