162° 



160° 



158° 



30° 



28° 



26° 



24° 



22° 



20° 



18° 



156° 



— I 



154' 



—r 



>26.5 <26.5 



<265 >26.5 



30° 



28° 



26° 



24° 



18° 



162° 



160° 



158° 



156° 



154° 



Figure 23. --Schematic diagram of the density (sigma-t) 

 distribution on the salinity minimum layer separated 

 into regions where the sigma-t is greater and less than 

 26.5. H. M. Sm ith cruise 20, March 1953. Cross - 

 hatched zones include stations of constant salinity 

 throughout a sigma-t range of 26. 1 to 26. 8. 



51 



