10°iM 



15°S 



100°W 95° 



75° 100°W 95° 



+ INCREASE 



- DECREASE 



J L 



75°100°W 95° 90° 85° 80° 75° 



Figure 6. — Temperatures observed during RV MOANA WAVE surveys off western South America in 1975. A, Mid-February 

 through March; B, Mid-April through May; and C, change in temperatures between time of two cruises. Isotherms in degrees 

 Celsius. 



1 1 



MC KINLEY VOYAGE 43E 



.1.? ^.. 



39° 

 38° 

 37° 

 36° 

 35° 

 34° 



VAN BUREN VOYAGE 47W 



19 



6 



TAFT VOYAGE 42E 



100 - 



200 - 



300 



Observations approximately 150 km and 2 days apart, 

 TAFT42E VAN BUREN 47W 



400 



100 



200 - 



300 - 



400 - 



P , ^'V^C^^^^Ww' 



.Poa, 





-a4 



A 



oor 



t^°. 



180° 



175° 



170" 



165° 



160° 



155^ 



150° 



145° 



140° 



Figure 7. — Ships-of-opportunity observations of seawater temperatures along North Pacific routes. Depths of 10° and 12°C 

 isotherms represent depth of main thermocline. 



19 



