Table 109 shows the average wind factors in the East Siberian Sea, according to Sverdrup's 

 observations from 1922 to 1924. The table indicates that the wind factor from July to September is 

 considerably greater, which is explained by the greater unevenness of the upper layers of ice and by 

 the fact that they are thinner and also by the greater free movement of the ice in the summer period 

 due to the greater number of open leads. 



TABLE 109. ELEMENTS OF THE WIND DRIFT OF ICE 

 IN THE EAST SIBERIAN SEA 



Winter Months (November- March) 

 Ice thickness about 3.5 m 



Summer Months (July- September) 

 Ice thickness about 2 m 



According to Sverdrup, if one considers only the winds that are sufficiently prolonged and 

 which insure steady motion, during the period 8 August 1922 through 17 March 1924, the wind factor 

 varied from 0. 0108 to 0. 0275, while the drift angle varied from 26° to 47°. The average values for 

 the whole period of observation were: wind factor 0. 0204, drift angle 37° 



During a wintering on Mys Schmidt (Cape Schmidt) in the Chuckchee Sea (1938 to 1940), 

 Gordienko made many observations of the wind drift of ice. These observations were made with 

 two theodolites mounted on the shore at a given distance from each other and from the actual drift- 

 ing ice. In addition, Gordienko used observations of the wind drift of ice made on Mys Schmidt by 

 Shestiperov. Gordienko compiled a table of wind factors as a function of the concentration and 

 hummocking of ice on the basis of his processing of these observations (table 110). 



From the table it is evident that ice with a concentration of 1/10 drifts approximately 4 times 

 faster than ice with a concentration of 9/10 and that the drift speed increases with hummocking. 



388 



