TABLE 10. MAXIMUM DIURNAL HEAT SUMS OF DIFFUSE RADIATION OF THE 

 ATMOSPHERE (G-CAL/CM2) 



According to observations, the greatest magnitudes of intensity of the diffuse radiation in 

 arctic regions occur with thin layer of low clouds attended by a light snowfall or mild snowstorm.* 

 Such conditions are frequently observed in arctic regions . 



z 

 lu 



INCIDENT RADIATIONl 

 DIFFUSE RADIATION ^\ 



I I I I t I I I I ' 

 2 4 6 8 10 12 M 16 18 20 22 



HOURS 



Figure 3. Intensity of incident and diffuse radiation at Mys Shmidta. 



In figure 3 is presented the dirunal variation of incident (continuous line) radiation on 4 June 

 1936, and of diffuse (broken line) radiation on 31 May of the same year (after observations by 

 Kuznetsov) at Mys Shmidta in the Chuckchee Sea. The sun's inclination varied from 31 May to 4 June 

 by only half a degree, so that the sun's elevation can practically be considered as constant. It 

 follows from examination of the figure that the magnitudes of the diffuse and incident radiations are 

 practically equal, but that at noon the quantity of diffuse radiation was even greater than that of the 

 incident radiation. 



♦These conditions are characterized by the greatest illumination. 



29 



