Figure 1. Model response to fossil fuel CO₂ invasion. Time series to the year 40,000, and the fully CaCO₃ neutralized state (t = [[infinity]] excluding the igneous weathering effect). (a) Atmospheric pCO₂ was driven by atmospheric pCO₂ projections from extended IPCC [Houghton et al., 1990] scenarios B, A (also referred to as BaU), and A extrapolated to the years 2200 and 2300 (A22 and A23). Dark lines include the effect of CaCO₃, light lines neglect CaCO₃. (b) Deep Pacific [CO₃⁼] (all results include CaCO₃). (c) Bioturbated layer deep sea CaCO₃. (d) Globally integrated accumulation rate of CaCO₃ in the deep sea; negative values indicate net dissolution.