X 30 - 



1800 



2200 



0200 0600 

 TIME (HOURS) 



1000 



1400 



Figure 35. Fractional volume displacement (filtered material times 10"' liters), 

 with transparency data (percent transmission) in red, Operation I. 



RED WATER 



The presence of intense concentrations of red water 

 caused by Gonyaulax polyedra during daylight hours 23, 24 July 

 1964 made possible the correlation of visual observations 

 from the NEL tower and from scuba-equipped divers in the 

 water. The observations, coupled with temperature data, 

 substantiated the data taken in 1961. 



The zone of greatest turbidity on 23 July (fig. 31) 

 was centered directly above the long-period vertical oscil- 

 lation of the thermocline cited previously. The lowest 



61 



