OCEANOGRAPHY 



423 



is only 7° or 8° C. at 400 metres, whereas in lats. 20° to 30° S. 

 there are large regions where it is above 12° C; sometimes above 

 13° C, or even 14° C. South of lat. 30° S. the temperature 

 decreases again rapidly; in the chart no lines are drawn for tem- 

 peratures below 8° C, as we have not suflScient observations to 

 show the course of these lines properly. But we know that the 

 temperature at 400 metres sinks to about 0° C. in the Antarctic 

 Ocean. 



Fig. 8. — Temperatures (Centigrade) at a Depth op 400 Metres 



(218 Fathoms). 



At these depths, then, we find the warmest water within the 

 region investigated by the Fram. If we now compare the dis- 

 tribution of temperature at 400 metres with the chart of currents 

 in the South Atlantic, we see that the warm region Ues in the 

 centre of the great circulation of which mention was made above. 

 We see that there are high temperatures on the left-hand side 

 of the currents, and low on the right-hand side. This, again. 



