NON-CONSERVATIVE PROPERTIES 



203 



STATIONS WSIO8O 



SEA MILES I 



OFFSHORE 



O- 



I50 



_L 



WSI08I WSI079 



I I 



125 100 



_L 



WSI078 

 I 



WSI077 WSI075 

 I I 



25 



'200 



400 



Fi g- 55- Distribution of phosphate (mg. ats. P/m. 3 ). Section off Walvis Bay, 29 September-3 October 1950, survey II. 



;Positions of stations are shown in Fig. 2. 



STATIONS WSII02 



SEA MILES ,,_ 

 OFFSHORE '" 

 



WSM00 



WS 1096 



200- 



300- 



Fig. 56. Distribution of phosphate (mg. ats. P/m. 3 ). Section off Mowe Point, 9-1 1 October 1950, survey II. 



Positions of stations are shown in Fig. 2. 



phosphate concentration on the continental shelf is higher than that in the water which is being 

 upwelled, and one must attribute this to further enrichment by local decomposition of organic matter 

 on the shelf. 



On the Orange river line of survey II (Fig. 53) there is a divergence of phosphate-rich water 

 towards the surface at the edge of the continental shelf. This corresponds with the diverging current 

 which was postulated from the isosteres on this line of stations (Fig. 37). 



