ABSTRACT 



Data from Standard Monitoring Sections A5, A6, and A7 for the years 

 1967-69 are presented together with vertical sections of salinity, tem- 

 perature, and sigma-t. The three major water masses on these Standard 

 Monitoring Sections; Coastal Water, Slope Water, and North Atlantic Central 

 Water; are described. 



On section A5, Coastal Water has vertical salinity gradients of 0.04%oto 

 0.08%o per meter and a horizontal salinity gradient of 0. l%o per mile. Slope 

 Water intrudes under Coastal Water producing a salinity maximum. North 

 Atlantic Central Water was found to be .020 to .025°/oo more saline than 

 Slope Water. 



On section A6, a body of uniform water, centered around 18°C, at 200 to 

 500 meters is bounded by thermoclines which are always present. This water 

 mass is formed to the north and east of section A6. 



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