8 August 1958 



On 8 August (fig. 14A-B) the top of the thermocline was within a very few 

 feet of the surface. The observation period started with two oscillations with a 

 slick on the receding side of the second crest. The second slick was on an ascend- 

 ing slope, and the third, a very small one, on a descending slope. The fourth was 

 in the middle of a descending slope falling off into a large depression. The fifth 

 slick was high on the slope of a very deep trough and, then, 35 minutes later 

 occurred the last slick of this day which was on the descending slope of the last 

 major trough. Actually, on this day, there were only four rapidly descending 

 slopes, all of which had associated slicks in the descending portion. The remaining 

 slicks were related to minor irregularities in the thermocline. 



The preceding examples of slicks and vertical oscillations of the thermocline 

 show that, whenever there is an appreciable dip in the thermocline, a slick is 

 present and usually occurs over the slope which precedes the depression. This 

 relationship will be discussed later. 



Figure 14A, B. Temperature structure and slicks 8 August 1958. 



19 



