There has also been an implied assumption 

 that the hydrographic stations whose tempera- 

 ture-salinity relationship is Mixed Water in 

 nature should have their geographical posi- 

 tions located between the Labrador Current 

 and the North Atlantic Current. 



The criteria used to determine the water 

 mass observed at each depth equal to or 

 greater than 50 meters are shown in Figure 

 63. The observed values are then entered, at 

 each depth level, under the correct water mass. 

 All values for the standard depths under each 

 water mass are then averaged and the yearly 

 average values are then plotted on a tempera- 

 ture-salinity diagram with the long term 

 average values. The observed values that are 

 atypical in nature are not entered on this mean 

 temperature-salinity chart. This subjective 

 data processing procedure causes the three 

 water masses to appear to have sharp geo- 

 graphical boundaries when in fact this may 

 not be true. Therefore, the information pre- 

 sented in Figure 25 should be interpreted 

 accordingly. 



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25 



