TEMPERATURE 



OBSERVED DISTRIBUTION OF TEMPERATURE AND SALINITY 171 



northern side of this wedge, where it abutted on the cooler coastal water. At stations WS 1061 and 

 1062 a slight temperature inversion was revealed by the bathythermograph observations, at depths 

 of 105 and 75 m. respectively (Fig. 24). 



The Sylvia Hill line (25 S.). Stations WS 1063-70 did not 

 lie sufficiently far to the west to reach the boundary with oceanic 

 water, and consequently they all lie within the coastal water. 

 The vertical sections (Figs. 25 and 26) show that active up- 

 welling must have been taking place on this line. 



The Walvis Bay line (23 S.). Here again there are indications 

 of active upwelling (Figs. 27 and 28). The inshore waters show 

 an interesting point: the salinity of the inshore surface-water is 

 very low (34-84 % ) and remained low out to WS 1078 (34-96 % ). 

 Below this, however, the salinity increased to 34-97 % on the 

 sea bed of the continental shelf. 



The salinity section suggests that there is a pronounced up- 

 lift of deeper water taking place on the edge of the continental 



Fig. 24. Graph ot temperature (° C.) against 

 depth (metres) at stations WS 1061 and 1062, 

 showing inversions present at these stations. 



STATIONS WSI070 



SEA MILES 

 OFF SHORE l0 ° 

 O- 



WS IOt.9 



I 



WS 1068 

 I 



WSK%4 



Fig. 25. Distributions of temperature (° C). Section off Sylvia Hill, 25-27 September 1950, survey II. 



Positions of the stations are shown in Fig. 2. 



STATIONS WSI070 

 SEA MILES 

 OFFSHORE 100 



o- 



WSIOM 

 I 



WSIOM 



•100 



30O 



200- „-- 



Fig. 26. Distribution of salinity (% ). Section off Sylvia Hill, 25-27 September 1950, survey II. 

 Positions of the stations are shown in Fig. 2. 



