1A° 

 N 



23 c 

 22° 

 21° 



20° 

 113° 



W 112° 



Figure 10. Locations of sample sections of smooth, normal, rough, and irregular 

 thermoclines. 



Smooth Thermocline 



Smooth thermoclines are isotherm undulations of a more 

 regular form than average. At a ship speed of 6 knots, the 12- 

 second scan falls several times on a crest and several times in 

 the trough. The wavelengths of the smaller oscillations extend 

 more than 2400 feet, or fewer than 2-1/2 oscillations per mile. 



Two examples of smooth thermoclines are identified as S-l 

 and S-2 (fig. 10). The first is from the central part of the area 

 (fig. 11A). The second (fig. 11B) comes from an easterly tow 

 directly south of Cape San Lucas. Smooth waves vary consider- 

 ably in wavelength of encounter, but average more than 2400 feet 

 in length. 



17 



