406 



Table 124 

 SPECIFIC HEAT OF SEA WATER 1 



Table 123 gives the specific heat of sea water at a temperature of 17.5 C C. and a pres- 

 sure of 1 atmosphere. 



1 Krummel, O., Handb. d. Ozeanographie, p. 279, Stuttgart, 1907. 



Table 125 



SPECIFIC HEAT OF SEA ICE 



The specific heat of pure ice depends upon its temperature and varies within narrow 

 limits, but that of sea ice is a much more variable property, depending upon the salt or 

 brine content and the temperature. Changing the temperature of sea ice will generally 

 involve either melting or freezing, and the amount of heat required will depend upon the 

 salinity of the ice, as shown in the table. It should be noted that the specific heat of pure 

 ice is less than half that of pure water. Near the initial freezing point, the extremely 

 high specific heat of ice of high salinity is, of course, due to the formation of ice from 

 the enclosed brine or its melting. 1 



Malmgren 2 has computed the data in Table 124 from observations made in the Polar 

 Sea. 



Salinity 



Temperature (°C.) 



1 Sverdrup, H. U., Johnson, M. W., and Fleming, R. H., The oceans, p. 73. Copyright, 1942, by 

 Prentice-Hall, Inc., New York. 



2 Malmgren, F., On the properties of sea ice, The Norwegian North Polar Expedition with the 

 Maud, 1918-1925, Scientific results, vol. 1, No. 5, 1927. 



Table 126 



MELTING POINT IN SEA WATER 1 



The melting point is the temperature at equilibrium between pure ice and sea water of 

 indicated salinity under a pressure of 1 atmosphere. 



1 Krummel, O., Handb. d. Ozeanographie, vol. 1, 241, Stuttgart, 1907. 



SMITHSONIAN METEOROLOGICAL TABLES 



