Convergence, BT casts were increased to half -hourly intervals. Surface 

 water samples for salinity and deuterium oxide (heavy water) determi- 

 nations were taken hourly commencing several hoiirs before the marked 

 change in temperature. Unfortunately, enroute to Antarctica, the BT 

 casts had to be discontinued for a period folloTd.ng the drop in temp- 

 erature because of rough seas. Fourteen hundred drift cards supplied 

 by thelI.S.Fish and Wildlife Service were released at the convergence 

 enroutej the remairiing 1,100 Hrift caixis released after crossing the 

 convergence on the return trip. 



Oceanographic station data were obtained at 13 stations in Antarctic 

 waters to provide information on temperature, salinity, density, and 

 sound velocity characteristics over the continental slopes of the Ross 

 and V/eddell Sea areas, particularly near the shelf ice face and seaward 

 for 50 miles, and in Bransfield Strait to study differences in water 

 mass structure and composition. Daily surface water samples were ob- 

 tained commencing at Panama and continued with few interruptions 

 throughout the cruise. 



Bottom cores were obtained to determine the physical and chemical 

 characteristics, distribution, origin, and depositional characteristics 

 o.f sediments surrounding the Antarctic Continent, Transparency measxire- 

 ments were made where light intensity permitted. Plankton tows, al- 

 though not a part of the oceanographic program, were made as a matter 

 of interest whenever possible. Continuous sonic sovmdings were made 

 during the cruise and analyzed to determine the occurrence and char- 

 acteristics of the deep scattering layer. Observed ice conditions 

 were plotted. Results of snow and ice tests at snow pits and from 

 ice cores on the shelf and fast ice were report upon, 



Oceanogranhic results of the cruise haAre been divided for the 

 sake of convf;T.ience into three main areas, the Ross Sea, Bransfield 

 Strait, and nhe Weddell Sea, 



C. Participating Personnel 



Sixteen observers i/ere aboard the ATKA during the cruise, re- 

 presenting such widely diversified activities as the Army, Navy, 

 Marine Corps, Air Force, Weather Bureau, Geological Survey, and the 

 New York Times, The following personnel represented the Navy Hydro- 

 graphic Office: 



Charles W, Culkin (Photogrammetrist) 

 Willis L. Tressler (Oceanographer) 

 Charles M. Williams (Cartographer) 



