Academic Journal
Effect of terrestrial nutrient limitation on the estimation of the remaining carbon budget
| العنوان: | Effect of terrestrial nutrient limitation on the estimation of the remaining carbon budget |
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| المؤلفون: | Sisto, Makcim L., MacDougall, Andrew H. |
| المصدر: | eISSN: 1726-4189 |
| سنة النشر: | 2023 |
| المجموعة: | Copernicus Publications: E-Journals |
| الوصف: | The carbon cycle plays a foundational role in the estimation of the remaining carbon budget. It is intrinsic for the determination of the transient climate response to cumulative CO 2 emissions and the zero emissions commitment. For the terrestrial carbon cycle, nutrient limitation has a core regulation on the amount of carbon fixed by terrestrial vegetation. Hence, the addition of nutrients such as nitrogen and phosphorus in land model structures in Earth system models is essential for an accurate representation of the carbon cycle feedback in future climate projections. Thereby, the estimation of the remaining carbon budget is impacted by the representation of nutrient limitation in modelled terrestrial ecosystems, yet it is rarely accounted for. Here, we estimate the carbon budget and remaining carbon budget of a nutrient limited Earth system model, using nitrogen and phosphorus cycles to limit vegetation productivity and biomass. We use eight Shared Socioeconomic Pathways scenarios and idealized experiments on three distinct model structures: 1) carbon cycle without nutrient limitation, 2) carbon cycle with terrestrial nitrogen limitation and 3) carbon cycle with terrestrial nitrogen and phosphorus limitation. To capture the uncertainty of the remaining carbon budget, three different climate sensitives were tuned for each model version. Our results show that overall the nutrient limitation reduced the remaining carbon budget for all simulations in comparison with the carbon cycle without nutrient limitation. Between the nitrogen and nitrogen-phosphorus limitation, the latter had the lowest remaining carbon budget. The mean remaining carbon budget from the Shared Socioeconomic Pathways scenarios simulations for the 1.5 °C target in the no nutrient limitation, nitrogen limited and nitrogen-phosphorus limited models obtained were 228, 185 and 175 Pg C respectively, relative to year 2020. For the 2 °C target the mean remaining carbon budget were 471, 373 and 351 Pg C for the no nutrient ... |
| نوع الوثيقة: | text |
| وصف الملف: | application/pdf |
| اللغة: | English |
| Relation: | https://bg.copernicus.org/preprints/bg-2023-96/ |
| DOI: | 10.5194/bg-2023-96 |
| الاتاحة: | https://doi.org/10.5194/bg-2023-96 https://bg.copernicus.org/preprints/bg-2023-96/ |
| رقم الانضمام: | edsbas.E00D2948 |
| قاعدة البيانات: | BASE |
| DOI: | 10.5194/bg-2023-96 |
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