For example, if we wish to determine how many centimeters 100 cm-thick ice will accrete if it is 

 subjected to 6000 freezing degree-days, we start along the graph horizontally at the number 100 

 and vertically at the number 6000, we find that the line of increment at the intersection will be 127 

 cm, which will be the answer to the question asked. 



It is clear that the given formulas, table and graph cannot pretend to be highly accurate. 



TABLE 70. THICKNESS OF THE ICE AND SNOW AND ELEVATION OF THE ICE SURFACE ABOVE 

 SEA LEVEL IN CM, DICKSON BAY, END OF FEBRUARY, 1944 



Table 70 gives the results of an ice-measuring survey conducted in Bukhta Dikson at the end 

 of February 1944 by Treshnikov, Subbotin and Sychev. Observations were made at 438 points, at 

 which time the ice thickness, snow depth and the height of the ice surface above sea level were 

 measured (the minus sign indicates that the ice surface was below the water level). In addition, 

 the table gives the frequency percentages which I computed. Since the measurements were made 

 at equidistant points, these same percentages characterize the areas occupied by the given values. 

 The data in the table show how great the fluctuations of ice and snow thickness are, even at close 

 distances, and how dangerous it is to draw conclusions from isolated measurements. 



Further, it is interesting to note that the observations of the growth of ice of different ages, 

 made during the drift of the Sedov, are an excellent confirmation of the applicability of formula (6). 

 This is apparent from table 71. 



It should be noted that formula (6) applies not only to the accretion of ice which is already 

 quite thick, but also to the formation of new ice. 



Thus, for example, if we consider that the ice observed by the Sedo u (1938-1939) began to 

 form on 1 September 1938, it should have been 110 cm thick according to formula (6) by 16 January 

 1939, when the number of freezing degree-days (counting from 1 September) had reached 2, 190. 

 As can be seen from table 71, the measured thickness of this ice was 107 cm. 



210 



