BATHYPELAGIC SQUID BATHYTEUTHIS 



129 



The isohalines plotted on the salinity section slope gradually deeper 

 as they extend northward (fig. 36). The 34.50%o isohaline occurs at 

 250 m at 63°S, and it descends to 1500 m at 50°S. The 34:.70%o isohaline 

 that lies just above the salinity maximum lies at 350 m at 63° S and 

 drops to 2200 m at 50° S. The very large segment of the salinity maxi- 

 mum that is outlined by the 34.72%o isohaline appears below 2250 m 

 at 50°S. Long ascending tongues of liigh salinity water penetrate 

 southward from the Pacific Deep Water Mass. The 3-1.74%o tongue 

 terminates at about 62°30'S in 1000 m. From 55°S to 61°S the maxi- 

 mum salinity layer above 34:.72%o is 1500 m thick. 



The isopycnics closely parallel the isohalines; the line for sigma-t = 

 27.75 follows the isohalines for 34.70%o and 34.72%o. Oxygen concen- 

 trations at a given depth decrease northward. The lines of equal oxygen 

 slope steeply below the oxygen minimum layer. An oxygen minimum 

 of 4.24 ml/L is located at 300 m at 63 °S while the minimum value of 

 4.04 ml/L is in 1850 m at 50° S. 



S^bS 



500 



1500 



2500- 



Figure 36.— Vertical section, 160°W, 48°-65°S; salinity°/oo, sigma-t. Capture points of 



Bathyteuthis abyssicola. 



