This area was characterized by a much sharper gradient than in the 

 surrounding waters with the decrease in concentration occurring in 

 a northward direction. 



Dissolved oxygen concentration averaged about 5.5 ml/1 at the 

 surface and 2.0 ml/1 at 200 meters. 



Z>& 



, , , I 



Lt 



Approximate 200-M«w lottom Contour 



_Li_ 



s Mnas (sETTwia) 



200 METEHS (SEPTEMBER) 



FIGURE 10. HORIZONTAL OXYGEN DISTRIBUTIONS 



D. Sound Velocity. 



1. Computed Sound Velocity from 

 Nansen Cast Data . A representative 

 sound velocity-depth profile is pre- 

 sented in Figure 11. This profile was 

 drawn from data observed in October 

 at station 19, located over the San 

 Nicolas Basin. Sound velocity decreased 

 sharply below 10 meters corresponding 

 to the thermocline at the same depth. 

 This decrease continued to approxi- 

 mately 100 meters where the gradient 

 weakened. Although the October sound 

 velocity values were slightly lower 

 due to cooler temperatures, the profiles 

 for both months were similar. 



Axial depths remained almost con- 

 stant at a depth of about 850 meters 

 throughout both phases of the survey. 



M 



=»..<, TOO mo IVS'UT ?&%"?<, 70 mo .30 . 





,„ 

























L s 





































1 























1 























t 























h 

























































































I 























V 























A 

























^ 



\ 





















,=oo 





X 













™"o U, I i °".pili'oo 







V 























\ 





















4.75 40 



' fbS"j. e » sciVJo "" " 





12 



