23 July 1958 



The temperature record for 23 July (fig. 9) started with a shallow gradient. 

 The first slick was on the wave slope or descending thermocline, similar to most 

 of the preceding examples. However, the second slick was an exception. It pre- 

 ceded the depression with which it must have been associated by 5 minutes. Just 

 why this slick was displaced from the depression is not known. One different fea- 

 ture was the colder water which had protruded upward. Following this large 

 rapid fluctuation, the vertical motion was more uniform, with only one minor 

 vertical shift in the thermocline apparent. The next major change in the vertical 

 excursion of the thermocline 18 minutes later amounted to 17 feet. Here, the lo- 

 cation of the slick was halfway down the slope. Finally, the last slick fell on the 

 center of the descending thermocline. This lowering of the temperature isolines 

 amounted to about 18 feet. It is evident from these examples that great changes 

 in depth of isotherms can occur in a short time of 1 or 2 minutes. 



24 July 1958 



On 24 July (fig. 10) the thermocline extended up to the surface. It was rather 

 uniform from the surface to 35 feet throughout the day's observation. At the be- 

 ginning, the temperature range was from 68° to 56°. The first slick occurred just 

 before a broad, wide depression in the thermocline. The slick associated with the 

 depression was on the gradual descending slope. The advancing wave slope was 

 steeper than the receding one. The second slick was found over the descending 

 slope, falling off into a broad depression 10 feet deep. Apart from one small os- 

 cillation which had no slick, the following six major oscillations each had an 

 associated slick varying in position from over the crest to the lower part of the 

 receding slope. The oscillations for this day were broader than for the preceding 

 two days. 



25 July 1958 



On 25 July (fig. IIA-B) the thermocline was strong and near the surface. The 

 first slick occurred just before the first depression, that is, on the receding slope. 

 The second slick, after numerous minor irregularities in the thermocline, oc- 

 curred near a crest of one of the minor irregularities. Numerous minor irregular- 

 ities in the thermocline occurred during the first hour of this day. The only major 

 slick was the first one. The next slick followed a small rise in the thermocline, 

 and was succeeded by a slick high on the slope of a sharp drop in the thermocline. 

 The record ended too early to notice whether any slicks were associated with the 

 last large wave. 



6 August 1958 



On 6 August (fig. 12) the thermocline also extended to the surface. The first 

 two slicks were on the receding side of a wave crest and over a depression in the 

 thermocline. The third, fourth, and fifth slicks occurred after minor crests, but 

 all three were on the receding side. The sixth and seventh slicks occurred on the 

 receding side of the major depressions. The seventh and eighth slicks also fell on 

 the receding side of the small internal wave crests. When the thermocline is near 

 the surface, as it was on this day, the slicks appear to be more uniform in rela- 

 tion to the thermocline evep though the oscillations are not great or very steep. 



14 



