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• W4322491758 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> Terrestrial carbon (C) sequestration is limited by nitrogen (N), a constraint that could intensify under CO₂ fertilisation and future global change. The terrestrial C sink is estimated to currently sequester approximately a third of annual anthropogenic CO₂ emissions based on an ensemble of terrestrial biosphere models, which have been evaluated in their ability to reproduce observations of the C, water, and energy cycles. However, their ability to reproduce observations of N cycling and thus the regulation of terrestrial C sequestration by N has been largely unexplored. Here, we evaluate an ensemble of terrestrial biosphere models with coupled C-N cycling and their performance at simulating N cycling, outlining a framework for evaluating N cycling that can be applied across terrestrial biosphere models. We find that models exhibit significant variability across N pools and fluxes, simulating different magnitudes and trends over the historical period, despite their ability to generally reproduce the historical terrestrial C sink. This suggests that the underlying N processes that regulate terrestrial C sequestration operate differently across models and may not be fully captured. Furthermore, models tended to overestimate tropical biological N fixation, vegetation C:N ratio, and soil C:N ratio but underestimate temperate biological N fixation relative to observations. However, there is significant uncertainty associated with measurements of N cycling processes given their scarcity (especially relative to those of C cycling processes) and their high spatiotemporal variability. Overall, our results suggest that terrestrial biosphere models that represent coupled C-N cycling (let alone those without a representation of N cycling) could be overestimating C storage per unit N, which could lead to biases in projections of the future terrestrial C sink under CO₂ fertilisation and future global change. More extensive observations of N cycling processes are crucial to evaluate N cycling and its impact on C cycling as well as guide its development in terrestrial biosphere models." @default.
• W4322491758 created "2023-02-28" @default.
• W4322491758 creator A5070335316 @default.
• W4322491758 date "2023-02-27" @default.
• W4322491758 modified "2023-09-30" @default.
• W4322491758 title "Comment on egusphere-2023-167" @default.
• W4322491758 doi "https://doi.org/10.5194/egusphere-2023-167-rc1" @default.
• W4322491758 hasPublicationYear "2023" @default.
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