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Simulated responses of soil carbon to climate change in CMIP6 Earth system models: the role of false priming

التفاصيل البيبلوغرافية
العنوان: Simulated responses of soil carbon to climate change in CMIP6 Earth system models: the role of false priming
المؤلفون: R. M. Varney, S. E. Chadburn, E. J. Burke, S. Jones, A. J. Wiltshire, P. M. Cox
المصدر: Biogeosciences, Vol 20, Pp 3767-3790 (2023)
بيانات النشر: Copernicus Publications, 2023.
سنة النشر: 2023
المجموعة: LCC:Ecology
LCC:Life
LCC:Geology
مصطلحات موضوعية: Ecology, QH540-549.5, Life, QH501-531, Geology, QE1-996.5
الوصف: Reliable estimates of soil carbon change are required to determine the carbon budgets consistent with the Paris Agreement climate targets. This study evaluates projections of soil carbon during the 21st century in Coupled Model Intercomparison Project Phase 6 (CMIP6) Earth system models (ESMs) under a range of atmospheric composition scenarios. In general, we find a reduced spread of changes in global soil carbon (ΔCs) in CMIP6 compared to the previous CMIP5 model generation. However, similar reductions were not seen in the derived contributions to ΔCs due to both increases in plant net primary productivity (NPP, named ΔCs,NPP) and reductions in the effective soil carbon turnover time (τs, named ΔCs,τ). Instead, we find a strong relationship across the CMIP6 models between these NPP and τs components of ΔCs, with more positive values of ΔCs,NPP being correlated with more negative values of ΔCs,τ. We show that the concept of “false priming” is likely to be contributing to this emergent relationship, which leads to a decrease in the effective soil carbon turnover time as a direct result of NPP increase and occurs when the rate of increase in NPP is relatively fast compared to the slower timescales of a multi-pool soil carbon model. This finding suggests that the structure of soil carbon models within ESMs in CMIP6 has likely contributed towards the reduction in the overall model spread in future soil carbon projections since CMIP5.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 1726-4170
1726-4189
Relation: https://bg.copernicus.org/articles/20/3767/2023/bg-20-3767-2023.pdf; https://doaj.org/toc/1726-4170; https://doaj.org/toc/1726-4189
DOI: 10.5194/bg-20-3767-2023
URL الوصول: https://doaj.org/article/58a2c499b6054870a7e6497adf7488ae
رقم الأكسشن: edsdoj.58a2c499b6054870a7e6497adf7488ae
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:17264170
17264189
DOI:10.5194/bg-20-3767-2023