DISCOVERY REPORTS 



The winter and summer temperatures, and the annual range of temperature, at the 

 different levels off South Georgia are shown in Table II. 



Table II. 



Fig. 15 shows the change of salinity during the year. The surface salinity is greatest 

 in September and least at the end of February. In summer it increases with depth, 



MARCH 



JUNE 



SEPTEMBER DECEMBER 



33-60 %o 



3370%, 



33-80% 



33-90% 



34-00% 



34-10% 



Fig. 15. The seasonal changes in salinity of Antarctic surface water 50 miles 

 north of Prince Olaf Harbour, South Georgia. 



slowly in the first 50 m., and then more rapidly, especially below 80 m. The difference 

 in salinity between the water at the surface and at a depth of 100 m. is greatest in summer 

 and least in winter. At a depth of 150 m. the minimum salinity is found in winter. This 



