3. Thermodynamic processes: Exchange of heat between 

 ocean and atmosphere 



As has been discussed above, all the absorbed heat 

 does not go into heating the oceans; some of the heat is lost 

 from the water, because of exchange with the atmosphere. This 

 exchange is composed of two processes, evaporation and molec- 

 ular conduction. According to Jacobs (1914-2), both these 

 effects may be incorporated into the following single relation- 

 ship: 



Qe = l45.4Wt(e,-ej[K0l^^)] 



(12) 



where 



Qg= amount of heat gained or lost by the sea surface 

 in g, cal. cm,-2 



W = wind velocity in knots, 



t = time in days, 



e^= saturation vapor pressure over the water surface 

 (in. Hg,), 



63= vapor pressure of the air (in. Hg.), 



T= temperature of the water in °P., 



Tg = temperature of the air in °P, 

 An Indication of the orders of magnitude of Qe under 

 typical conditions may be obtained from table II* These 

 data were computed under the assumption that the air temperature 

 was 60°P. and the relative humidity 75%- Values for Qg are 

 presented for various wind speeds and for various sea-air 

 temperature difl'erences by assuming that the process of exchange 

 went on for one day only. It will be noted that with hl^ih 



11 



