Temperature {degrees Fahrenheit) 

 30 35 40 30 35 ■ 40 30* 35 40 



FIGURE 7. Vertical temperature structure, type S-1A. Traces showing the characteristic of one of these three types were found occasionally in 

 the belt from 59° to 65° S between 175° E and 100° W. These traces represent variations of the typical summer thermal structure. The sub- 

 surface minimum is not well defined and the trace is rather irregular. Trace "A" was found most frequently near the continent, except early in 

 the season when the type occurred as far north as 62° S. 



Temperature (<Jegtees Fahrenheit) 



_/~ <fc„ 



FIGURE 8. Vertical temperature structure, type S-2. These traces are typical of regions where the surplus radiation of the summer season has 

 just begun to create a warmer surface layer. These traces are most frequently found near the continent where the winter cooling has extended 

 to relatively great depths. Consequently the positive gradients found between 300 and 500 feet on most thermal structures in the antarctic do 

 not appear here. 



14 



