Horizontal heat changes were deduced in the course of the calcu- 

 lation. For clear skies the water column between the surface and 20 

 feet gained 8.U6 gm cal/hour when solar radiation exceeded outgoing 

 radiation; for partly cloudy skies the water column lost heat at the 

 rate of h.'Jl gm cal/hourj for cloudy skies the heat loss was 21.9^ 

 gm cal/hour. The temperature equivalents of these horizontal fluxes 

 range from 0.015°F/hour to 0.07°F/hour. Thus, horizontal fluxes are 

 of the same order of magnitude as the evaporative heat flux in chang- 

 ing the temperature of the water column. 



UJ 



20 - 



40 - 



X 



a. 60 



UJ 



o 

 80 



100 



1 1 ; 



PARTLY CLOUDY (3-5) v/ 



— / 

 / 



/ 

 / 



CLEAR (0-2)-y^— ' 



. 1 



I 



■ — "j^ • 



— 



/ / 



• 

 • 

 • 



..-^CLOUDY (6-8r 



/ A 1 .•" 



1 



76.8 77.0 77.2 77.4 77.6 



MEAN TEMPERATURE (•F)-SEPT 1959 



FIGURE 12 MEAN BT's FOR VARIOUS CLOUD CODES 



22 



