Nansen casts were coincidentally taken at about the time of high 

 and low tides. A definite pattern, however, is indicated. 



Using data collected on anchor station 2 (October) , the same 

 experiment was conducted to determine whether this pattern was a 

 recurrent phenomenon. Resultant curves are shown in Figure 16. On 

 this figure, Ramsay probe values were 

 added after a 3.4 m/sec correction had 

 been applied. Examination of these curves 

 indicates that the peaks and troughs do 

 not coincide as closely as those of anchor 

 station 1. In fact, sound velocity maxima 

 appear to be displaced to the right as the 

 depth increases until maximum sound veloc- 

 ities correspond to low tide, a condition 

 just the reverse of station 1. 



Sinusoidal oscillations of the Nansen 

 cast sound velocity data were not as prom- 

 inent at anchor station 1 as they were at 

 anchdr station 2. This result probably 

 is due to the times at which the casts 

 were taken, thus serving to illustrate the 

 time requirement disadvantages of Nansen 

 times for the different depths studied. 



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A comparison of data taken at anchor station 1 in both September 

 and October revealed similar sinusoidal curves. Maximum and minimum 

 velocities corresponded with high and low tides, respectively, but 

 the September curves were not as pronounced as those in October. 

 Anchor station 2 sound velocities did not display any relationships 

 other than that maximum sound velocity values occurred at the same 

 times for the different depths studied. 



Another interesting feature at anchor station 1 (October) is 

 the dampening of the sinusoidal pattern to mid-depth and the amplification 

 at greater depths (Fig. 15). The 200- and 400-meter profiles, which 

 are not presented in Figure 15, were nearly straight lines. At approximately 

 600 meters, the sinusoidal form once again becomes more obvious, 

 and at 800 meters, the curve is similar to the one at 100 meters. 



Anchor station 2 (October) did not display this increase in the 

 range of sound velocity values at 600 meters, instead, dampening 

 continued to the bottom. One explanation is that tidal forces have 

 less effect as depth increases. 



The differences between the two stations are difficult to explain. 

 One possible solution could be the phases of the moon, but no connection 

 seems likely as the time difference between occupation of anchor 

 stations 1 and 2 in both September and October was only one day. 

 Lunar phase effect on the tides could not possibly cause such a change 



15 



