two-thirds of the profile to above 2.0°C,as a band of Upper Deep Water, which in- 
creased in thickness toward the north. Lower Deep Water underlay this portion of 
the section. On the southern one-third of the section, below the surface layer, 
temperature increased to just over 1.00°C at 400 meters and then decreased toward 
bottom. 
Salinity generally increased from north to south at the surface and also with 
depth. A broad band of salinity maxima, with values above 34.70%, appeared to 
rise toward the surface from depths of 1,000 to 1,900 meters at the northern station 
to a depth of approximately 400 meters at the southern stations. Below this band of 
maximum salinity, salinity values decreased to the bottom, with the bottom values 
lower to the south. 
The sigma-t surfaces sloped upward to the south with the steepest slope on the 
northern two-thirds of the profile. The 27.75 isopycnal closely followed the ob- 
served maximum temperature layer. This isopycnal is located below 900 meters at 
station 33 and rises to a depth of 200 meters at stations 36 and 37. 
Surface oxygen values all were above 7 ml/I but less than 8 ml/I, except for 
station 35 with an observed value just over 8 ml/|. The amount of oxygen present 
decreased rapidly to a value of 4.50 ml/I at 300 meters at all stations. A band of 
oxygen minimum existed to a depth of about 400 to 500 meters, below which values 
increased with the greatest increase to the north to approximately 2,000 meters . 
4. Summary 
The zone of convergence is located north of the profile presented. Work 
by Midttun and Natvig (1957) in this area showed the Convergence to be located 
at about 56°25'S, along 150° west longitude during late January 1948. 
Antarctic Upper Water was observed to extend from the surface to the vicinity 
of 200 meters, as shown in the temperature profile of Figure 25. A rapid transition 
into Upper Deep Water, on the northern two-thirds of the profile with temperatures 
of 2.0°C and above was observed. Below this, Lower Deep Water was found, which 
shoaled southward as Antarctic Circumpolar Water. The similarity of the vertical 
structure for station 37 and stations near the continental shelf in both the Amundsen 
Sea area and those farther south in the Ross Sea should be noted; it is indicative of 
the vast expanse of the Circumpolar Water. Bottom Water was not observed because 
of observational depth limitations attributed to bad weather . 
The BRATEGG Expedition data (1947-1948) shows that the Upper Deep Water 
extends approximately 150 miles south of the Convergence. In Figure 25, the 
44 
