SEA SURFACE 



50 - 



BEAD 

 SAMPLING 

 DEPTHS 15 c 



/"w'N.. 



SEA FLOOR 



1600 



1800 



TIME 



Thermistor bead sensors are suspended vertically 2 feet apart. The signals 

 from the sensors are interpolated electronically and recorded as whole 

 degree centigrade isotherms. The thermal structure (above) is in a time-depth 

 analog presentation 9 inches wide and recorded at 10 minutes per inch. The 

 internal waves are almost always present. 



SEA SURFACE 



10 - 



20 



40 --< 



50 - 



60 



BEAD 



Sampling 



[DEPTHS 



WATER MASS 

 BOUNDARY 



16° 



15° 



.\_.;„_£r£>'< 



13° 



SEA FLOOR 



?^^^^^^^^^^^^^^^^^^^^^^^^^ 



0700 



TIME 



Abrupt changes in depth occurring in some isotherms are caused by water 

 mass boundaries moving past the tower. The depth of the isotherms com- 

 prising the thermocline is a principal study. 



29 



