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Process-oriented analysis of dominant sources of uncertainty in the land carbon sink

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Nabel,  Julia E. M. S.       
Computational Infrastructure and Model Development (CIMD), Scientific Computing Lab (ScLab), MPI for Meteorology, Max Planck Society;
Max Planck Institute for Biogeochemistry, Max Planck Society;

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Pongratz,  Julia       
Climate-Biogeosphere Interaction, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;
Max Planck Institute for Biogeochemistry, Max Planck Society;

Zaehle,  Sönke
Max Planck Institute for Biogeochemistry, Max Planck Society;

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s41467-022-32416-8.pdf
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41467_2022_32416_MOESM1_ESM.pdf
(Supplementary material), 2MB

Citation

O’Sullivan, M., Friedlingstein, P., Sitch, S., Anthoni, P., Arneth, A., Arora, V. K., et al. (2022). Process-oriented analysis of dominant sources of uncertainty in the land carbon sink. Nature Communications, 13: 4781. doi:10.1038/s41467-022-32416-8.


Cite as: https://hdl.handle.net/21.11116/0000-000A-E916-7
Abstract
The observed global net land carbon sink is captured by current land models. All models agree that atmospheric CO2 and nitrogen deposition driven gains in carbon stocks are partially offset by climate and land-use and land-cover change (LULCC) losses. However, there is a lack of consensus in the partitioning of the sink between vegetation and soil, where models do not even agree on the direction of change in carbon stocks over the past 60 years. This uncertainty is driven by plant productivity, allocation, and turnover response to atmospheric CO2 (and to a smaller extent to LULCC), and the response of soil to LULCC (and to a lesser extent climate). Overall, differences in turnover explain ~70% of model spread in both vegetation and soil carbon changes. Further analysis of internal plant and soil (individual pools) cycling is needed to reduce uncertainty in the controlling processes behind the global land carbon sink.