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Atmospheric CO2 forces abrupt vegetation shifts locally, but not globally

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Abstract

It is possible that anthropogenic climate change will drive the Earth system into a qualitatively different state1. Although different types of uncertainty limit our capacity to assess this risk2, Earth system scientists are particularly concerned about tipping elements, large-scale components of the Earth system that can be switched into qualitatively different states by small perturbations. Despite growing evidence that tipping elements exist in the climate system1,3, whether large-scale vegetation systems can tip into alternative states is poorly understood4. Here we show that tropical grassland, savanna and forest ecosystems, areas large enough to have powerful impacts on the Earth system, are likely to shift to alternative states. Specifically, we show that increasing atmospheric CO2 concentration will force transitions to vegetation states characterized by higher biomass and/or woody-plant dominance. The timing of these critical transitions varies as a result of between-site variance in the rate of temperature increase, as well as a dependence on stochastic variation in fire severity and rainfall. We further show that the locations of bistable vegetation zones (zones where alternative vegetation states can exist) will shift as climate changes. We conclude that even though large-scale directional regime shifts in terrestrial ecosystems are likely, asynchrony in the timing of these shifts may serve to dampen, but not nullify, the shock that these changes may represent to the Earth system.

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Figure 1: Transitions between vegetation states projected for the period 1850–2100.
Figure 2: Sensitivity to rainfall and atmospheric CO 2 concentration.
Figure 3: Hysteresis in vegetation state.

Change history

  • 08 August 2012

    Axis labelling in Fig. 1d was corrected.

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Acknowledgements

We thank D. Bennu and T. Hickler for helping us improve the manuscript. Financial support was provided by the Deutsche Forschungsgemeinschaft and Hesse’s Landes-Offensive zur Entwicklung Wissenschaftlich-ökonomischer Exzellenz (LOEWE) programme.

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S.I.H. and S.S. jointly conceived the study. S.S. ran the simulations. S.I.H. led the writing.

Corresponding author

Correspondence to Steven I. Higgins.

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The authors declare no competing financial interests.

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Supplementary Information

This file contains Supplementary Methods, Supplementary Tables 1-2 and additional references. (PDF 195 kb)

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Higgins, S., Scheiter, S. Atmospheric CO2 forces abrupt vegetation shifts locally, but not globally. Nature 488, 209–212 (2012). https://doi.org/10.1038/nature11238

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