Abstract
Surface waters in the Caribbean undergo seasonal salinity depressions in the fall of each year, coincident with increased concentrations of dissolved silicate. An indirect temporal relationship between silicate and salinity of this type suggests that the freshwater in such seasonal salinity depressions originates in part from silicate-rich land runoff and rivers. The observed temporal and spatial distribution of low-salinity, silicate-rich waters in the eastern Caribbean and in the western equatorial Atlantic suggest that the Amazon River is the primary source. A simple three-point mixing model involving subtropical surface water, Amazon River water, and North Atlantic tropical rain water indicates that at least 60% of the freshwater in these seasonal salinity depressions originates from the Amazon River.
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