Currently, δ11B ratios analysis in corals is the only method to extract in-situ changes of paleo-ocean pH at sub-seasonal to annual resolutions. The project will explore this emerging proxy’s spatio-temporal variability in different ocean basins to understand the current and past rates of ocean pH change. By producing multiple high-resolution pH time series together with classical isotopes and trace element records from corals, a clearer picture of the ongoing climate crisis can be recognized. This ongoing research project will include inter-coral species comparison from different oceans to focus on pH variability, characteristics, and OA impacts.