After integration and elimination of logarithms, we arrive at formula 



in which 



k 



- TB 



(4) 



B 



'^ li) ^w w 



If in figure 8, the air temperature (t^ ) is replaced by the water temperature (t^,), and vice 

 versa, we have a schemative presentation of a gradual approximation of the temperature of water 

 to that of the continually arriving air. The upper curve characterizes the case when the water 

 temperature is higher than the air temperature. The lower curve characterizes the case when the 

 water temperature is lower than the air temperature. In summer, the offshore winds correspond 

 to the lower curve. In winter, the offshore winds correspond to the upper curve. Winds coming 

 from icy areas and passing across open water correspond to the upper curve in winter as well as 

 in summer. It is evident that the upper curve characterized both convectional and frictional var- 

 iations of sea temperature, while the lower curve only the frictional variations. 



TIME 



Figure 9. The variation of temperature of a warmer sea and of the air at 

 various distances from the coast. 



Figure 9 schematically presents the variation of sea temperatures at various distances from 

 a windward coast for the case of a colder wind. Simultaneously, a gradual but a more significant 

 variation of air temperature is shown in the figure. At a certain distance from the coast, these 

 temperatures become almost equalized, approaching a certain temperature, t , 



Because the amount of heat received by the atmosphere equals the amount of heat given off 

 during the same time by the sea, we can write that. 



H^ C.^ S,^ d/. 



Ha Ca Sfl dta, 

 where the subscript a denotes atmosphere and w pertains to the sea. 



On the basis of formula (5), we have 



(5) 



dto 

 dt^. 



Ha Ca S. 



(6) 



43 



