HYDROLOGY 



described in the previous paragraph. The melting of ice by the heat of the sun, or by 

 warmer water, produces fresh water, and this will give rise to an accumulation of cold 

 poorly saline water at the surface near the ice. As this light water collects, so it will 

 stream away from the ice at the surface until it meets water of lower density under which 



3000 



ZMO 



1000 



1000 



2000 



1000 



-3000 



Fig. 3. Section through South Georgia along the line AB in Fig. 2 with vertical scale exaggerated. Heights 

 and depths in metres. The positions of soundings are indicated along the base line. 



Fig. 4. Chart showing the line of the Antarctic Convergence, separating the Antarctic and the sub-Antarctic 

 Zones, and the course of the two surface currents which influence South Georgia within the Antarctic Zone. 



