Figure 12.

Changes in terrestrial carbon storage simulated over the twenty-first century and the implications for CO₂ rise and climate change, from simulations with the HadCM3LC coupled climate–carbon cycle model driven by the IS92a emissions scenario (Cox et al. 2000). (a) Time-series of changes in global mean vegetation carbon (black) and soil carbon (grey) (Gt C) relative to 1860, in the fully coupled climate–carbon cycle simulation. (b) CO₂ rise (ppmv) simulated as a result of the IS92a emissions scenario, with the effects of climate change on land and ocean carbon fluxes included (black) and excluded (grey). (c) Global land mean temperature rise (°C) relative to 1860, with CO₂ simulated including climate–carbon cycle feedbacks (black) and with CO₂ imposed from projections which exclude climate–carbon cycle feedbacks (grey).