Abstract
Salinity and silicate concentrations were studied at about fortnightly intervals for 21 months at a station near Barbados, W. Indies; latitude 13°15′ N, longitude 59°42′ W. A sensitive inverse correlation was found to exist at 5 and 25 m, but not at greater depths. Salinity near the surface varied between 33.5 and 36.0‰, and silicate between a little less than 1 and 4 μg at/l. Low salinity water, rich in silicate, was found from February to July; salinity increased and silicate decreased from September to December. It is argued that the low salinity water at Barbados can be identified with the areas of reduced salinity found by Ryther et al. (1967) about latitude 8° to 10° N, longitude 50° to 55° W, and that this water originates from the Amazon River. Local precipitation does not seem to be a significant factor.
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