Because of the rapid scanning rate, the isotherms are near- 

 ly continuous. The part of this record nearest shore (WX) con- 

 tains the 8°, 9°, and 10°C isotherms and shows the descending or 

 deepening trend of the isotherms in an offshore direction. The 

 other two parts (XY and YZ) also contain three to four isotherms. 

 These isotherms dip to the right. 



It is apparent that none of the isotherms is horizontal, and 

 that they fluctuate up and down in a short distance or interval of 

 time. The thermocline or thermal structure, in general, is 

 rough. The detail shown in figure 3 cannot be obtained by bathy- 

 thermograph lowerings or with other instruments. 



Alongshore Section 



From point B, 31°22'N, 120°41'W, the chain was towed in a 

 southeasterly direction (154°) parallel to the continental shelf. 

 This traverse started at 1830 on 11 July and ended at 0700 on 12 

 July at point C, 30°10'N, 120°00'W. Some of the temperature 

 data collected on this leg are presented in figures 4 and 5. In 

 both figures the record is broken into three connecting parts, as 

 in figure 3, with WX the farthest north and YZ the most southerly. 



Figure 4 covers the depth range from 100 to 300 feet with 

 isotherms from 12° to 17 °C, and includes the main thermocline. 

 The isotherms are more nearly horizontal than for the offshore 

 leg, and the surface becomes warmer in the more southerly sec- 

 tions. Figure 5 covers the depth range 400 to 600 feet, where 

 only the 9° and 10°C isotherms were found. In both figures it is 

 again evident that the depths of isotherms change over short dis- 

 tances. 



12 



