STATION 

 30 29 28 27 26 25 24 Z3 22 21 20 19 18 17 16 15 14 13 12 11 10 9 



7 6 5 4 3 2 I 



Figure 4, --Vertical temperature section along 150 W. longitude, showing the estimated 

 hauling depths of the surface (•), intermediate (■), and deep samplers (▲) 

 in relation to the temperature structure. The isotherms are derived from 

 900-ft. bathythermograph observations taken on stations 1 through 30 of 

 Hugh M. Smith cruise 16, July-August 1952. The top of the thermocline is 

 indicated by the dashed line. 



TEMPERATURE (°F) 



60 



70 



Figure 5. --Bathythermographs representative of the vertical temperature 

 structure in the North Equatorial Current (NEC), the Counter- 

 current (CC), and the South Equatorial Current (SEC), at the 

 station positions indicated. The hauling depths of the surface, 

 intermediate, and deep plankton samplers are shown (X). A 

 dashed line is drawn at the top of the thermocline. 



