FIGURE 5. Vertical temperature structure, type W-1. During winter the surface layers are cooled to nearly freezing temperatures down to the 

 depths of 200 to 500 feet. The traces are indicative of the thermal structure early in the summer season before surface heating has greatly 

 altered the typical winter structure. The areas where these particular structures were observed are also indicated. Observations were not taken 

 in other areas early enough in the season to obtain this structure. 



FIGURE 6. Vertical temperature structure, type S-1.The majority of bathythermograms taken in the antarctic region during the southern summer 

 were of this general type. The typical subsurface minimum was found in a broad belt running nearly around the Antarctic Continent. The width 

 of the belt extends from near the continent northward to between 55° and 60° S. This type was found as far south as 70° S in the region of 

 the Ross Sea. 



13 



