

 7.0 



8.0 9.0 f 10.0 11.0 12.0 13.0 140 At (°F) 40.0 41.0 42.0 4 



MEAN 



A B 



■3.0 44.0 45.0 46.0T 400 (°F) 



MEAN 



80 



en 60 — 



50 



S 40 



o 

 o: 30 



20 



004 0.08\ OI2 



MEAN 



G. = 0.088 

 S =0.034 

 280 OBS 



Mft 



0.32 0.36 6 t (°F) 



FIGURE 13 FREQUENCY DISTRIBUTIONS, MEANS, AND STANDARD DEVIATIONS OF At, 



TEMPERATURE AT 400 FEET, AND TEMPERATURE GRADIENT (G f ) PER FOOT 

 IN THE THERMOCLINE BASED ON HALF-HOURLY BT'S 



27 



