The carbonate system has been studied in the Florida Bay from 1997 to 2000. Measurements of pH, total alkalinity (TA) and total inorganic carbon dioxide (TCO2) were made from 20 stations in the bay and used to calculate the partial pressure of carbon dioxide (pCO2)
and the saturation states of aragonite (ΩArg) and calcite (ΩCal). The results were found to correlate with the salinity. The pH was low and the pCO2 was high for the freshwater input from the mangrove fringe due to the photochemical and biological
oxidation of organic material. The TA and TCO2 for the freshwater input are higher than seawater due to the low values of pH and Ω. The pH was high and the pCO2 was low in November in regions where the chlorophyll is high due to biological production. During the
summer when the salinity is the highest the normalized values of TA and TCO2 were lower than average seawater, due to the inorganic precipitation of CaCO3 caused by the resuspension of sediments or the biological loss by macroalgae. A transect across the mangrove fringe
near the outflow of Taylor Slough shows that PO4 and TA increases as the freshwater enters the Bay. This is thought to be due to the dissolution of CaCO3 in the low pH waters from the bacterial and photo oxidation of plant material.
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