where t j is the average minimum temperature of the ice, r is the freezing point, 6^ is the ice 

 density, c f is the specific heat of the ice, i is the ice thickness, A is the heat of the fusion, and 

 Ai is the increase of ice thickness due to its internal cold reserves, characterized by the left side 

 of equation (1). 



get 



For the sake of simplicity, if we assume that \ = 80 g-cal/g and c . - 0.5 g-cal/g, we will 



^'=V'' 



(2) 



or if we consider that the temperature of the ice changes linearly from its upper to its lower sur- 

 face, we get 



M = 



160 



to—-^ ■ 

 I = " / 



' 320 ' 



(3) 



where t^ is the temperature of the upper surface of the ice and t, as before, is the temperature of 

 the lower surface of the ice, equal to the freezing point of the sea water in which the ice is floating. 



I computed table 83 according to formula (3). 



TABLE 83. MAXIMUM ICE ACCRETION DUE TO THE LOW TEMPERATURES WITHIN 

 THE ICE (IN CM) 



Table 83 infers that the internal cold reserve cannot increase the ice thickness more than 5 

 to 10 per cent. 



UTERATURE: 77. 



239 



