The well-defined temperature structure seen 

 between stations 7 and 22 persists, though 

 with rather less intense gradients, between 

 stations 23 and 37 (fig. 12). The strong, 

 shallow thermocline on the eastern side is 

 still superimposed on the deeper one that 

 extends to the west beyond the frontal system 

 between stations 29 and 31; remains of the 

 cool water found at station 15 persist at 

 station 29. 



The structure and relationship of the 

 thermoclines mentioned above are modified 

 between stations 40 and 48 (fig. 13.). Com- 

 pared with the profile to the north (fig. 

 12), the thermocline is shallower in the 

 west (station 48) and weaker in the east 

 (station 40). The frontal system is not 



present (see horizontal distributions 

 later). 



The thermocline is shallower still, farther 

 south, between stations 50 and 56 (fig. 14), 

 but has recovered some of its strength on 

 the eastern side between stations 54 and 56. 

 These data, however, show no marked up- 

 welling in the area of Cape Corrientes at the 

 time of the cruise, although it is generally 

 believed to occur thereabouts (Roden and 

 Groves, 1959). 



The foregoing discussion has been largely 

 concerned with the thermocline; it is therefore 

 appropriate to include here the horizontal dis- 

 tribution of thermocline depths (fig. 15). At 

 stations where two thern-ioclines were evident, 

 only the stronger was used in the figure. 



STA. NO. 153. 70 

 



100 - 



200- 



300- 



o. 



Ill 



a 



400- 



500- 



600 



100 



200 



- 300 



400 



500 



600 



Figure 9. — Vertical temperature profile along line 153 of CalCOFI cruise 6004-B. 



12 



