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. We use observations of dissolved inorganic carbon (DIC)and total alkalinity (TA) to assess the impact of ecosystem metabolicprocesses on coastal waters of the eastern Red Sea. A simple,single-end-member mixing model is used to account for the influence ofmixing with offshore waters and evaporation–precipitation and to modelecosystem-driven perturbations on the carbonate system chemistry of coralreefs, seagrass meadows and mangrove forests. We find that (1) along-shelfchanges in TA and DIC exhibit strong linear relationships that areconsistent with basin-scale net calcium carbonate precipitation; (2) ecosystem-driven changes in TA and DIC are larger than offshore variationsin &gt;70 % of sampled seagrass meadows and mangrove forests,changes which are influenced by a combination of longer water residencetimes and community metabolic rates; and (3) the sampled mangrove forestsshow strong and consistent contributions from both organic respiration andother sedimentary processes (carbonate dissolution and secondary redoxprocesses), while seagrass meadows display more variability in the relativecontributions of photosynthesis and other sedimentary processes (carbonateprecipitation and oxidative processes). The results of this study highlightthe importance of resolving the influences of water residence times, mixingand upstream habitats on mediating the carbonate system and coastal air–seacarbon dioxide fluxes over coastal habitats in the Red Sea.

Anomalies in the carbonate system of Red Sea coastal habitats