0.931 c 



SkLJ^f and 



h = 20 ft (609.6 cm). 



For these values, a change of 0.1°F in mean temperature of a layer 20 

 feet thick is eq^uivaleat to a heat gain or loss of 32.292 gm cal/cm2. 



Individually measured hourly heat changes in the water do not 

 balance, "because the measured changes are the result of several fac- 

 tors acting simultaneously, such as evaporation, condensation, sensi- 

 ble heat change, mechanical mixing, convection, conduction, and hori- 

 zontal transport (advection). Sufficiently lengthy observation periods 

 appear necessary for minimizing the effects of these processes. 



TABLE 3 



NET AND ABSCtRPTIVE HEAT CHANGES FOR CLEAR SKIES ( Cloud Code 0-2) 



(gm cal/cm^/hr) 



Hour 



Met 

 Radiation 





Net Measured feat Change 







Measured Absorptive 



Heat Change 





(zi 



Budget 



0'-20' 



20 '-1*0' 1*0 '-60' 



60'-80' 



80 '-100' 



0'-20' 



20'-40' 



4o'-6o' 



60'-80' 



80 '-100' 



TOTALS 



10-U 



7.29 



-it.84 



-8.07 -8,07 



-9.67 



-14,53 



1.61 



1.61 



-1.61 



3.23 



1.61 



6.45 



11-12 



26.S9 



12.92 



8,07 6,1*6 



6.1*6 



4.64 



3.23 



1.61 



0.00 



0.00 



1,61 



6.45 



12-13 



53.39 



32.29 



2l*.22 22.60 



2l*.2£ 



24.22 



6.46 



1.61 



0.00 



-1.61 



1.61 



8.07 



13-11* 



56.90 



1*8,1*1* 



38.75 32.29 



30.68 



33.91 



6.46 



3.23 



3.23 



-1.61 



-1.61 



9.70 



14-15 



65.21 



58.13 



1*6,82 35.52 



32.29 



38.75 



6.46 



4.84 



6.46 



-3.23 



-3.23 



U.30 



15-16 



59.00 



5l*.90 



1*1.98 30.68 



27.1*5 



32.29 



6.46 



6.46 



4.84 



-1.61 



-3.23 



12,92 



16-17 



59.'*5 



1*3.59 



32.29 20.99 



16.15 



17.76 



4.64 



6.46 



4.84 



0.00 



-1.61 



14,53 



lT-18 



50.02 



27.1*5 



17.76 6,1*6 



1,61 



0.00 



1.61 



8.07 



3.23 



1.61 



0.00 



14,52 



18-19 



35.02 



i*.8i* 



-1.61 -11.30 



-11*. 53 



-17.76 



-1.61 



e.07 



1.61 



1.61 



1.61 



U,29 



19-20 

 TOTALS 



12.62 



-16,15 



-17.76 -20.99 



-24,22 



-30.68 



-3.23 



4.84 



-1.61 



4.84 



1.61 



6.45 



for 

























10-20Z 



1*25.79 



261. ?7 



182.1*5 111*. 61* 



90.1*1* 



88,80 



32.29 



46.80 



20.99 



3.23 



-1.63 

 3.23 



3.23 

 1.61 



101.66 



20-21 

 21-22 

 22-23 



IjjuJ: ji.(ufA^tr.g^ at ^ y 



'^., ..:r. 



3.23 

 1.61 

 1.61 





23-00 

 00-01 





UaJ. 





^Jt- 









1.61 

 -3.23 



-3.23 

 -3.23 





Table 3 presents net and absorptive heat changes in the water calculated 

 from fitted mean temperature curves. The data used in preparing this 

 table are presented in appendix A. This table gives the hourly changes 

 in the various layers and the computed absorption. The method of deriv- 

 ing the mean temperature curves is discussed below. Conduction (eddy 

 and molecular) obviously plays a major role in distribution of absorbed 

 thermal energy on an hourly basis. If the hourly changes in table 3 are 

 plotted (figure 3)* the time lag and diminution of heating with depth 

 are clearly portrayed. However, if the hourly heat changes are totaled 

 or, alternately, if the total heat changes for the hours when Qg is posi- 

 tive are calculated, the phenomenon of absorption is more easily explained. 



