The fitted mean hourly surface temperatures in figure 7 shov that 

 highest temperatures occvirred during afternoon hours vlth nearly clear 

 skies, vhereas highest temperatures with cloudy skies were recorded 

 between s\inset and midnight. Mean temperatures were almost identical 

 for all cloud types indicating that the data are not biased toward any 

 particular weather condition. 



MIDNIGH T 



08 



20 



00 



12 16 

 TIME (Z) 

 FIGURE 8 AVERAGE AIR -SEA TEMPERATURE DIFFERENCES 



04 



Air temperature (figure 8) was only recorded at three-hour inter- 

 vals. As a result, the air-sea temperature difference observations 

 could not be smoothed and raw means are presented. All but one of the 

 2k three-hour means were negative indicating that the sea was wanner 

 than the air during this season, as expected. The differences for clear 

 skies are fairly uniform and show a slight diurnal range with least dif- 

 ference in midafternoon. The graph for cloudy skies is more irregular 

 and shows an apparent peak just before noon. 



Estimation of the Bowen ratio for the average measured relative 

 humidity of approximately jB percent indicates that about 6 percent of 

 the total evaporative plus sensible heat exchange was sensible heat, 

 thus 9^ percent was evaporative. Evaporation was therefore 0.55 cm/day, 

 based on the values for evaporative and sensible heat exchange given in 

 tables h, 6, and 7« 



17 



