7 August 1958 



On 7 August (fig. 13) the water was mixed near the surface, but a strong ther- 

 mocline remained at 10 feet throughout the day's observations. A minor depres- 

 sion occurred about 10 minutes after the start of the record. A slick occurred just 

 before the trough. For over an hour after this, only minor irregularities existed 

 in this relatively constant-depth thermocline. The second significant depression 

 of only a few feet occurred with a slick on the ascending side of the depression. 

 The only major depression of the day occurred toward the end with a -strong 

 slick on the descending slope. The period towards the end of the record probably 

 features the flattest thermocline yet experienced in this region. For nearly 30 min- 

 utes, the major part of the thermocline varied less than plus or minus 2 feet. 



Figures 13A, B. Temperature structure and slicks 7 August 1958. 



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