TABLE 72. COMPUTED ICE THICKNESSES FOR DICKSON ISLAND 



Table 72 shovi's the thickness of ice accretion at Dickson Island, computed from formula (6), 

 according to the number of freezing degree-days at the end of each month from 1921 to 1936. The 

 next to the last column of the table shovi's the averages for the investigated period, and the last 

 column, the difference between the maximum and minimum values. It is interesting that while the 

 difference between the maximum and minimum numbers of freezing degree-days reaches 25 per 

 cent, the difference between the extreme ice thicknesses is only 15 per cent. This is explained by 

 the fact that the rate of accretion is the slower, the thicker the ice. 



The next to the last line on the table shows the maximum observed ice thickness for individual 

 years, and the last line, the difference between the observed and computed values. The sign of 

 these differences varies, and their absolute sum is not great; this proves that the formula adopted 

 for the computations is correct and that the reasons for these differences are not systematic. The 

 most important of these is the fluctuation of the depth of the snow cover. 



Figure 74. Isolines of the thickness of ice accretion for the winter of 1938-1939 in (cm). 



Figure 74 shows the isolines of ice thickness in the seas of the Soviet Arctic, computed by 

 formula (6) for the winter of 1938-1939, As can be seen from the figure, accretion ice reaches its 

 maximum in the East Siberian Sea. 



213 



