2°C 



^r^J^ 





EFFECTS 

 Surface temperature variations from such diverse causes as ship's wake, divers working 

 below the thermocline, or passive sea-surface slicks may be measured with the infrared 

 sensor. Other temperature changes have periods corresponding to those of surface and 

 internal waves. Variations as small as 0.1 degree centigrade are detected. This tracing 

 from a recorder chart shows typical fluctuations. 



INFRARED RECORDING OF 

 SURFACE TEMPERATURE 



2°C 



20 — 



16 "C w 



.x/^w/r^*'*"' 



40 — 



SEA FLOOR — 



15°C 



14°C 



-6 MIN 



A 



'/s^ A* 



w 



The infrared recording 

 equipment clearly identi- 

 fies temperature changes 

 associated with thermal 

 fronts, and agrees with 

 the sharply dipping iso- 

 therms simultaneously re- 

 corded on the vertical 

 temperature array. (Upper 

 curve traced from recorder 

 chart.) 



43 



