Abstract
Empirical relationships of salinity, potential temperature, oxygen, nitrate, phosphate, and silicate as functions of σ θ have been obtained for a set of Sargasso Sea stations sampled during 1977. The relationships were determined by fitting the data with a cubic-spline function using the minimum number of knots (intervals) that would adequately describe the data. Salinity, potential temperature, and oxygen functions were derived from continuous CTD data over the σ θ range 26.00 to 27.88. The cubic-spline functions for nitrate, phosphate, and silicate cover the smaller range 26.32 to 27.91, due to the sparsity of the discrete bottle data at lower σ θ values. Property anomalies vs σ θ were obtained for several Gulf Stream and Slope Water stations by subtracting the Sargasso Sea cubic-spline functions from observed profiles. The salinity, potential temperature, and oxygen anomaly plots show features characteristic of each of the two areas. The nutrient anomaly plots for the Gulf Stream and Slope Water show only small variations relative to the Sargasso Sea Water reference curves.
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