Data from: Contrasting CO2 dynamics in seagrass meadows between organic carbon (OC)-rich reef and OC-poor terrestrial sediments: Implications for enhanced alkalinity production

This dataset covers the carbonate chemistry of seawater and porewater, sediment carbon content, and benthic alkalinity fluxes and carbon dioxide removal (CDR) in two distinct seagrass meadows: one situated in organic carbon (OC)–rich reef sediments and the other in OC–poor terrestrial sediments. Seawater carbonate chemistry parameters include temperature, salinity, pH, pCO2, dissolved inorganic carbon (DIC), total alkalinity (TA), bicarbonate (HCO3-), carbonate (CO32-), and aragonite saturation state. Porewater parameters include pH, DIC, TA, pCO2, aragonite saturation state, and calcium ion concentration. Sediment characterization covers total organic carbon (TOC), total inorganic carbon (TIC), and total nitrogen (TN). The benthic flux data include measurements taken during the daytime, nighttime, daily, and annually. The carbon dioxide removal capacity of seagrass was calculated from the measured total alkalinity.