ZOOGEOGRAPHY 



215 



LATITUDE 170 S 



MARCH 1937 



50 S 

 AC 



APRIL 



STATION NO. 20,10 2QI2 2014 2015 2017 2018 2020 2022 2023 20 ( 24 2025 



405 



1937 

 20,26 



STC 

 2027 



5000m 



5O0 m 



4500m 



Text-fig. 20. Distribution of salinity (%„) between 70 S. and 35 S. in the region of the 

 Greenwich Meridian, March-April 1937. 



(a) Antarctic Intermediate Water has been shown by Deacon (1933) to reach a depth of about 

 1 100 m. in latitude 45 S. increasing to 2000 m. in 30 S. and decreasing again to about 1200 m. in 

 5 S. along the meridian of 30 W. It is characterized by its low salinity, which at the level of minimum 

 salinity increases from 34-15 to 34-65 % between 47 S. and the Equator; the temperature increase 

 over this distance is from 3-2° to 4-85° C. 



The principal direction of movement of Antarctic Intermediate Water can be seen in the tem- 

 perature sections (Text-figs. 15, 17, 19, 21), in the sinking of Antarctic Surface Water at the Antarctic 

 Convergence, where the isotherms for 2 and 3 C. between 150 and 500 m. swing markedly north. 

 The depth of the layer has been estimated from these sections, at stations where samples were collected 

 near the boundary between it and the Warm Deep Water. The temperature in Antarctic Intermediate 



