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Proton-controlled mechanism for coupling among proton production/consumption reactions in CaCO3-oversaturated waters or calcifying organism-inhabited seawaters Ichikawa, Kazuhiko Acid attack Calcifying organism Phytosymbiont Proton mechanism CaCO3-oversaturated water pH Seawater pH The CaCO3-oversaturated weakly basic water at around pH=8 was proved by the novel simple equations (e.g. log [Ca2+] = -2pH -logPCO2 + 9.94) derived from material energetics and proton-controlled mechanism for coupling among proton/hydroxide production/consumption reactions (e.g. CaCO3 + H+↔HCO3- + Ca2+) in equilibrium with atmospheric carbon dioxide. The cyclic/oscillating variation between pH=8.3 and 8.0 for marine calcifying organism-inhabited paleo and preindustrial seawaters was elucidated by applying the improved proton-controlled mechanismto biochemical reactions in cytoplasts or host tissues of marine calcifying phytoplanktons and phytosymbiont-bearing corals/zooplanktons. It was revealed that photosynthesis enhances biogenic calcificationand vice versa, as the thicker growth of CaCO3-made outer casings causes proton production and photosynthesis continuously needs protons to produce CO2(aq) from major HCO3-. The correlation between calcification and photosynthesis creates a number of stationary states with respect to oscillating pH variation. Marine biogenic calcification reaction releases no CO2 to atmosphere and is no positive feedback to rising atmospheric PCO2 levels. Atlanta Publishing House LLC 2010-12-22 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf application/pdf https://www.eurjchem.com/index.php/eurjchem/article/view/156 10.5155/eurjchem.1.4.246-251.156 European Journal of Chemistry; Vol. 1 No. 4 (2010): December 2010; 246-251 2153-2257 2153-2249 eng https://www.eurjchem.com/index.php/eurjchem/article/view/156/PDF https://www.eurjchem.com/index.php/eurjchem/article/view/156/2520