52 



of minimum stability. At depths of about 2,000 meters and 3,000 

 meters another minimimi and maximum are indicated, but because 

 of the errors involved in determining the stability the reality of such a 

 minimum and maximum is questionable at present. 



500 



10^00 



1500 



2000 



2500 



3000 



3500 



4000 



SAL. % 



Figure 55.— Vertical section of salinity. Stations 1961 to 1965. July 15-17, 1935. 



If lateral mixing actually is a maximum at levels of maximum 

 stability the good agreement between the location of the axes of mini- 

 mum salinity and maximum vertical stability shows that this tongue of 

 low salinity arises from lateral mixing as the mixed water along the 

 border of the Atlantic Current follows the course of that current as 

 indicated by figure 54. It should be emphasized that the topographic 

 dynamic charts, such as figure 54, give the major direction of flow 



