100 



110 



120 



J 30 



140 



I 50 



160 



170 



180 



170 



ISO 



Fig. 1. — Location of five crossings of the Antarctic Convergence (sections A, B, 



C-1, C-2, and C-3) 



Horizontal Surface-temperature Sections 



IdeaDy, if the surface temperatures were plotted against latitude, 

 with temperature as the vertical co-ordinate and latitude as the horizontal 

 co-ordinate, the Antartic Convergence should appear on such a plot as a 

 sharp break in the slope of the surface-temperature curve. A schematic 

 presentation of such a graph under ideal conditions is shown in Fig. 2. 



When actual observed values of surface temperatures are plotted in 

 the above fashion erratic variations of the surface temperature com- 

 plicate the picture considerably- (see Fig. 3). The more observations 

 available, the more complex the surface-temperature fluctuations appear. 

 They are related to variations in meteorological conditions, currents, and 

 melting ice, as well as to the convergence circulation. However, in each 

 section the characteristic break in temperature is easily discernible. 



291 



