Sea Intermediate Water. The deep water has a temperature between 

 1.6°C and 2.8°C^ a salinity of ^h.GQto to 34.78 1, and an oxygen 

 content of 3-18 to 4.17 ml/l.^ 



Special conditions exist in the Andaman Sea which are charac- 

 teristic of all semi-enclosed "basins. Water below the sill depth, 

 which is at about 1,500 meters, assumes a constant temperature and 

 salinity which approximates the temperature and salinity at this 

 depth of the water outside the basin. The temperature remains 

 close to 4.8°C, and the salinity does not vary from about 34.9 %o 

 from the sill depth to the bottom. 



Temperature-Salinity DiagramB . The four cross-sectional T-S 

 diagrams at the end of this chapter bring out the variability 

 according to geographic location of the water masses beneath the 

 surface layer. These T-S diagrams were not projected all the way 

 to the surface because the surface waters vary so widely with 

 fluctuations in the climate and currents that they are not included 

 in the analysis. The observation symbols on the T-S diagrams corre- 

 spond to the station symbols on the accompanying charts and tables, 

 for each cross section in the Bay of Bengal and the Indo-Australian 

 Basin. The numbers which appear beside the symbols on the diagrams 

 indicate the depths of the observations. 



It is apparent from the T-S relationship that the subsurface 

 waters of the Bay of Bengal are very uniform in all parts of the 

 bay north of 5°N and can be identified as the Indian Equatorial 

 Intermediate Water. This water also crosses the Equator and extends 

 in a southeastward direction to the southern end of Sumatra. 



^Muromtsev, Basic Outline of the Hydrology of the Indian Ocean , 

 p. 86. 



33 



