suppress settings of the AGODDS (AGOR Oceanographic Digital Data 

 System) equipment. The settings of the AGODDS printout system are 

 calibration constants which are used to convert the FM signals pro- 

 duced by the probe to usable values. 



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Despite the different values obtained by the two methods, the 

 usefulness of a velocimeter is apparent. The velocimeter may be 

 lowered repeatedly, is less time consuming, and gives more data points 

 than do Nansen casts. The 50-meter profile in Figure 14 illustrates 

 the difficulty of accurately determining maximum and minimum sound 

 velocities during a 24-hour period using only four Nansen cast observations. 



3. Discussion of Other Sound Velocity Influences . To explain 

 the sinusoidal pattern of the sound velocity profiles, the tidal 

 cycle was assumed to be the most influen- 

 tial factor. Figure 15 presents a set of 

 representative time-series curves that 

 were drawn from Nansen cast data at 

 anchor station 1 (October) to possibly 

 relate sound velocity variations with 

 tides. The dashed curve in the middle 

 of the figure represents observed tides 

 at Los Angeles corrected for San Nicolas 

 Island. At first glance, the high and 

 low sound velocities appear to correspond 

 to high and low tides, respectively. 

 The similarity between the sound velocity 

 profiles and the tidal curve is striking, 

 especially at the 50-meter depth. This 

 similarity is mainly the result of the 

 ordinate scale employed and because 



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14 



