Quantify critical pH thresholds for major marine ecosystems and model feedback acceleration mechanisms

Comparative analysis of pH decline rates across ocean basins, correlation with carbonate saturation states, and modeling of shell-forming organism stress thresholds using empirical data from pteropod, coral, and shellfish populations.

Current acidification rate (0.1 pH units/decade) exceeds pre-industrial baseline by 30x. Critical thresholds for calcifying organisms occur at pH 7.8-7.9, with 60% of shallow Pacific waters already experiencing seasonal undersaturation. Positive feedback loops via reduced carbon sequestration accelerate warming.