29 c 



28' 



27 



26 



25 



24° 



23 



22° 



21 



20° 



The four examples presented in the following sections de- 

 scribe thermal structures recorded along sections of continuous 

 tows made off the western and southern coasts of Baja California 

 (fig. 5). All sections in figures 6-9 represent straight-line tows 

 of nearly 4 hours duration, or about 24 miles. 



MEXICO 



Common Type 



The first example (fig. 6), taken 50 miles off Baja California 

 at Position 1, is the isotherm recording made while the thermistor 

 chain was towed at a speed of about 6 knots. The vertical scale, 

 magnified about 100 times compared to the horizontal scale, causes 

 the isotherms to appear much steeper than in actuality. Only 

 seven whole-degree isotherms, 16° to 10°C, occurred in the upper 



117° W 116° 115° 114° 113° 112° 111 110° 109° 108° 107° 106° 105 



Figure 5. Locations of four measured examples of thermal structure. 



