Coral Calcifying-Fluid pH Regulator

This simulation models the actual biomineralization mechanism behind coral reef growth: a coral polyp pumps hydrogen ions out of its calcifying fluid to raise the local pH — and with it the aragonite saturation state Ω — above the surrounding seawater, letting it keep building its calcium-carbonate skeleton even as ocean acidification drives seawater Ω downward. Drive atmospheric CO₂ from the pre-industrial 280 ppm baseline toward 1000 ppm, dial in the coral's biological pumping strength, and layer on thermal stress or symbiont-loss bleaching to see how the energetic cost of that pump — and the cushion it buys against acidification — collapses under combined stressors, tracked live through seawater and calcifying-fluid pH, Ω_arag in both compartments, and a saturation-state-driven calcification rate.