physical oceanographic 

 observations in the antarctic * 



THERMAL STRUCTURE OF THE SURFACE LAYERS 



General. Scientific personnel in the Western Task Group 

 of Operation HIGHJUMP made 1,083 bathythermograph lower- 

 ings. Lowerings were made (1) along the route of the USS 

 CACOPAN and the USS HENDERSON from San Diego to the 

 antarctic, (2) in the antarctic, and (3) as far as the equatorial 

 region on the return cruise. In the antarctic region the lower- 

 ings were made periodically during the operation. They 

 cover the area shown in figure 2, where each lowering is 

 represented by a solid dot. The location of similar obser- 

 vations that were made by both the Eastern and the Central 

 Task Groups are represented by open circles in the same 

 figure. 



The majority of the observations were made with a type 

 CTB-40080 (450-foot maximum depth) bathythermograph; 

 however, a large number were made with a type CTB-40180 

 (900-foot maximum depth) bathythermograph. In conjunction 



*In this section many of the discussions and figures related 

 to bathythermograph data have been adapted from the work 

 done by Lt. Luis Capurro and Captain Estil Hamiil when they 

 were associated with the Bathythermograph Analysis Section. 

 This work is discussed in Oceanographic Report No. 10, 

 Scripps Institution of Oceanography, dated 24 October 1947, 

 entitled "Analysis of Bathythermograms from Operation 

 HIGHJUMP'.' These bathythermograph studies include obser- 

 vations made by various ships on Operation HIGHJUMP rather 

 than just those of the Western Task Group. 



