Figure 4

Parameter of climate-carbon cycle interaction in the conceptual model (a) and transient temperature sensitivity α computed for 100-year running segments (b) as functions of t / t _p . Shown are curves for t _p = 50 and 150 yr (thin and thick lines respectively) with β = 1.5 and 2.5 PgC/ppmv (dashed and solid lines correspondingly) and $\Delta T_{2\times {\text{CO}}_2}$ = 2 and 4 K (black and gray lines respectively) for κ = 28 ppmv/K.