SALINITY (y_) 



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Fig. 12. Comparison of USS PURSUIT T-S data and T-S curve for Yucatan Channel, redrawn from Iselin, 

 1936 - (a) PURSUIT stations having lowest dynamic heights relative to 400 meters; and (b) PURSUIT 

 stations taken in southwestern section during latter phase of survey 



71. TIDAL INFLUENCE 



No tidal currents are in evidence except perhaps close inshore. 

 However, data from an anchor station occupied by the USS SAN PABLO 

 between HLspaniola and Jamaica give the interesting result shown in 

 figure lU, where current speed at the surface is plotted against 

 time. The curve closely resembles that of a tidal cycle although 

 there is little change in direction. It is believed that any tidal 

 influence is usually masked by the larger circulatory picture. 



11 



