RHINCALANUS GIGAS 



289 



Scotia Sea south of South Georgia and in the South Atlantic east of South Georgia the 

 waters of the two origins mix. 



Beneath the surface water in the Weddell Sea is a warm deep current flowing west- 

 wards into the Weddell Sea from the Indian Ocean south of 66° S and east of 15° E. 

 It follows the clockwise course of the surface water in the Weddell Sea and flows out 

 as a cold deep current (cooled on its passage around the Weddell Sea) towards the South 

 Sandwich Islands. "As soon as it meets warm deep waters of Pacific or Atlantic origin 

 it both sinks below them and mixes with them" (Deacon, 1933, p. 229). 



Fig. 5. Isotherms (°C.), calculated from the average temperature of the surface 100 m., in the Falkland 

 Sector of the Antarctic, November 193 1 to mid-January- 1932. 



With regard to the area traversed during the circumpolar cruise outside the Falk- 

 land Sector, only two hydrological features, in addition to the two layers of water 

 already described (Antarctic surface water and warm deep water), are of interest to us 

 in the present report. The first of these is the West Wind Drift which forms a continuous 

 easterly movement of Antarctic surface water, with a strong northerly component, all 

 round the Antarctic Continent. The second is the exactly opposite movement which 

 takes place round the Antarctic Continent in the region of easterly winds south of about 

 65° S. This current, flowing westwards around the coast of Antarctica, is known as the 

 East Wind Drift, and it is this current which flows into the Weddell Sea south of 66° S 

 and out of it again along the east coast of Graham Land as the north-easterly Weddell 

 Sea current. The boundary between the West Wind and East Wind Drift currents is 



