Surface Water Properbies . The Equatorial Stu'face Water is located 

 between 1-2 and 6-8°S latitude in the Indian Ocean and includes a 

 layer to about 6o meters depth. Its temperature ranges between 26 

 and 27°C. The amount of precipitation exceeds evaporation over the 

 entire region^ which leads to a freshening of the surface water. 

 Salinity is 3^« - 35- %o with the maximum value in the west and the 

 oxygen content is 3*^0 - "{,hG ml/l.''' 



South Tropical Surface Water is formed in the Tradewind Zone_, 

 between 6-8 and l8-23°S latitude and occupies the layer to about 

 150 meters. The constancy of the winds in these latitudes maintains 

 a relatively constant air tempei-ature which is about l" cooler than 

 the water temperature. In winter the temperature range in a south 

 to north direction is between 20 and 26° C and in summer it is be- 

 tween 25 and 28° C. Precipitation exceeds evaporation over most of 

 the region and the salinity is 3^. 5 - 35' 2 X^ The absolute oxygen 

 content is 3.6Ii- - i4-.83 ml/l. 



South Australian Surface Water is present on the eastern side 

 of the ocean between 23 and 35°S latitude to a depth of I50 meters. 

 The prevalence of winds from a southern direction and the relatively 

 cold underlying surface of the region result in air temperatures 

 which remain for the greater part of the year 1 to 2° lower than 

 the water temperatures. The water temperature varies from north to 

 south between 20° and 15°C in the winter time and between 24° and 

 19°C in the summer. The amount of precipitation is small in this 

 region compared to the evaporation, which determines the significant 

 increase in the salinity of the water, which is 35-0 "to 35.8/tc.. The 

 oxygen content is 3-64 to 4.83 ml/l- 



■""Muromtsev, p. 86. 



52 



