ABSTRACT 



Between 2 and 21 September 1959, approximately 900 

 bathythermograph observations (BJ's) were obtained at Ocean 

 Weather Station ECHO (35° N, 48° W). In addition, incoming 

 radiation from sun and sky and reflected radiation from the sea 

 surface were recorded. By grouping the BT data according to 

 cloud amount, mean hourly temperatures were obtained. Esti- 

 mates of heat absorption, evaporation, and changes in horizon- 

 tal heat content (advection) for clear, partly cloudy, and cloudy 

 skies were derived from these mean temperatures. The ocean 

 was assumed to be neither gaining nor losing heat during this 

 season of the year. For clear skies, evaporative heat loss ex- 

 ceeded long-wave (back radiation) heat loss; for cloudy skies, 

 condensation resulted in a net gain of heat. Hourly mean tem- 

 peratures and temperature gradients are presented. Surface 

 temperature was changed about 0.1° F by evaporative heat flux 

 and a comparable amount by horizontal heat flux. 



