The difference between these quantities represents the 

 amount of heat that has gone into increasing the temperature. 

 Since the terms in the heat budget are usually expressed 

 in gram-calories per square centimeter per minute, Q$ may 

 be found by dividing the differences between two values of 

 heat content by the number of minutes between the middle of 

 each of the two periods over which the heat content was deter- 

 mined. The amount of heat which has been used to increase 

 the temperature in the interval from 25 to 31 December and 

 1 to 31 January and in the interval between this latter period 

 and 1 to 6 February, are presented in table 3, together with the 

 corresponding values of Q g . The central day in each period 

 is used to represent the period. 



Table 3. Heat used to raise the temperature in the surface layers. 



Time Interval 



Change in Heat Content 

 (gm.-cal./cm.-) 



(gm.-cal./cm. 2 /min.) 



December 28 

 to January 16 



January 16 

 to February 3 



796 



5900 



0.028 

 0.195 



The equation for the heat budget may be simplified some- 

 what since considerations of the processes which maintain 

 evaporation and heat conduction lead to the development of 

 an expression for the ratio of the convection of sensible heat 

 to the heat lost by evaporation. This ratio, R = C^/Qe , is 

 called the Bowen ratio and may be determined from the ob- 

 servations of the moisture and temperature gradients over 

 the sea. In this case the equation becomes: 



Q s - $b - Qi ' e e (l + r) ' Qv ' Qe = °- 



20 



