Abstract
A “snap shot” survey of the Mississippi estuary was made during a period of low river discharge, when the estuarine mixing zone was within the deltaic channels. Concentrations of H+, Ca2+, inorganic phosphorus and inorganic carbon suggest that the waters of the river and the low salinity ( 5‰). The phytoplankton abundance (measured as chlorophylla) increased as the depth of the mixed layer decreased in a manner consistent with that expected for a light-limited ecosystem. Fluxes of NO3−+NO2− and soluble inorganic phosphorus to the Gulf of Mexico were estimated to be 3.4±0.2×103 g N s−1 and 1.9±0.2 g P s−1 respectively, at the time of this study.
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