major flow toward the west, the South Equatorial Current,, Since the 

 currents near the Equator cannot be computed through use of the 

 concept of the geostrophic current, the South Equatorial Current,, 

 and in some cases the Countercurrent P is interrupted on the sections,. 



Bathytherm ograph sections: Temperature sections, using 

 the bathythermograph data, are reproduced in figures 6, 13, 16, 22, 

 and 28,, 



Two bathythermograph observations were made at each 

 hydrographic station and additional lower ings were made between 

 stations „ During cruise 5, BT casts were made at approximately 

 10-mile intervals,, During cruise 8, BT casts were made at approx- 

 imately 20- to 30-mile intervals except for closer, 10-mile intervals 

 between the Equator and 5° - 7 N 



The curve at the top of each bathythermograph section 

 describes the surface temperature and was drawn using the bucket 

 temperatures smoothed with reference to the continuous -recording 

 thermograph,, In figure 6 between 5° 20' N and 10° 00" N„ , and in 

 figure 28 between 17° 00' N c and 18° 50' N„ „ the surface temperature 

 is relatively high and varies irregularly,, This behavior is associated 

 with light winds During the times that these irregularities occurred, 

 the wind speed was predominantly Beaufort force 1 and calm 



In figure 13 the surface temperature changes abruptly 

 near 4° 20' N„ This occurs at the surface intersection of the Equa- 

 torial Front, a feature which is described in some detail elsewhere 

 (Cromwell 1953) 



Sigma-t; In figures 7, 17, 23, and 29, the configuration 

 of the sigma-t surfaces indicates relatively dense water in the surface 

 layer near the Equator Q This is associated with the equatorial up- 

 welling Nowhere else in the figure does the density of the surface 

 layer indicate any appreciable addition of water from below,, 



The lines of constant sigma=t near the Equator bend down- 

 ward in the lower part of, and just below, the thermocline„ In figure 6, 

 for example, the isopleths of sigma-t = 26. 6_ through sigma-t - 27„ 

 exhibit pronounced local depth maxima at the Equator This feature 

 appears in each of the sigma-t sections of this report, in the sections 

 drawn by Cromwell (1953), and in the one by Montgomery (1954)„ It 

 appears to be a prevalent feature of the central equatorial Pacific 



Salinity; The salinity cross sections are shown in 

 figures 8, 18, 24, and 30„ Regions of salinity greater than 34.8 /oo 

 are hatched. 



7 



