TEMPERATURE 



Temperature (fig. 11) ranged from less than 56 °F 

 at the bottom to greater than 68 °F at the surface. The 

 thermal structure is plotted from BT's with reference to 

 the surface, but referred to, as in the case of turbidity and 

 plankton, with reference to mean sea level. A thermocline 

 was present (60 to 64 °F isotherms) throughout this operation. 

 The middle isotherm of the thermocline, 62 °F, was at 42 

 feet at 1800 and at 18 feet at 0500. At this point the thermo- 

 cline, as indicated by the 62 °F isotherm, moved to 42 feet 

 at 0900. The peak of this oscillation, or the shallowest 

 thermocline, occurs about 0500; the deepest thermocline 

 occurs late in the afternoon. This typical cycle is caused 

 by diurnal wind changes. 



1800 



2200 



0200 0600 

 TIME (HOURS) 



1000 



Figure 11. Water temperature (°F), Operation I. 



27 



