Abstract
Coral reefs are exceptional environments where changes in calcification, photosynthesis, and respiration induce large temporal variations of pH. We argue that boron isotopic variations in corals provide a robust proxy for paleo-pH which, together with the likely concomitant changes in the reconstructed partial pressure of CO 2 ( P CO 2 ) calculated by Matear and McNeil, fall within ranges that are typical of modern coral reef ecosystems.
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