Discovery reports (1940) Discovery reports discoveryreports19inst Year: 1940 WARM DEEP WATER 95 water which has made the circuit of the Weddell Sea has a very high content. Ob- servations south of 6o° S in the Atlantic sector of the Southern Ocean showed that the content decreased towards the east and north. In the eastern part of the South Atlantic Ocean between 69° S and 3f° N the content in the current increased from the ice-edge (3700-3900 mg. in the upper part and 4000 mg. at the depth of maximum salinity) to 4950 mg. and 5000 mg. in the eastward- flowing Weddell Sea deep water. Nort
Discovery reports (1940) Discovery reports discoveryreports19inst Year: 1940 WARM DEEP WATER 95 water which has made the circuit of the Weddell Sea has a very high content. Ob- servations south of 6o° S in the Atlantic sector of the Southern Ocean showed that the content decreased towards the east and north. In the eastern part of the South Atlantic Ocean between 69° S and 3f° N the content in the current increased from the ice-edge (3700-3900 mg. in the upper part and 4000 mg. at the depth of maximum salinity) to 4950 mg. and 5000 mg. in the eastward- flowing Weddell Sea deep water. North of this latter current the content decreased until at i2|° S the content at the salinity maximum was 2250 mg. South of Cape Town the content increased southwards, and in the upper part of the current values of 1200-1700 mg. were recorded at the Antarctic convergence, with 4450 mg. at the ice-edge. At the deeper position of the salinity maximum the increase southwards was from 2850 mg. to 4850 mg. at the ice-edge. Higher values were, how- ever, found in 1932 in this area. In the western part of the South Indian Ocean the upper part of the current had a content of 4250-5050 mg. in the south and 3250 mg. at the Antarctic convergence, the LATITUDE 68°5 I 64° nj«fr sa° 56* S 1 5CQ* V ⢠DECEMBER 1933 X SEPTEMBER 1934 G MARCH 1934 AOCTOBER 1934 â NOVEMBER 1934 Fig. 27. Graph showing the variation of the silicate content from south to north at the depth of maximum salinity of the warm deep water in 8o° W. content falling northwards across the sub-Antarctic zone from 2900 mg. to 1100 mg. At the deeper position in the current the decrease northwards from the ice-edge to the subtropical convergence was from 5200-6100 mg. to 350omg. In the subtropical zone the warm deep water is mainly of North Atlantic origin, and the content at the salinity maximum was 3150-3300 mg. North of 200 S in the tropical zone the warm deep water is of North Indian Ocean origin, a
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