. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. ANTARCTIC SURFACE WATER 55 from the ice-edge to far north as 631° S in all the months examined. In March this rapid fall was of the order of 1850 mg. and in the other months 550-1200 mg. In March the extent of the fall is exaggerated by the presence of sub-Antarctic water of low silicate content in the 0-60 m. layer at Sts. 1315 and 1316. When the narrow width of the Antarctic zone in 8o° W is considered the silicate gradient across the zone is very steep. LATITUDE STATION '- OEcisJ. fflt
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. ANTARCTIC SURFACE WATER 55 from the ice-edge to far north as 631° S in all the months examined. In March this rapid fall was of the order of 1850 mg. and in the other months 550-1200 mg. In March the extent of the fall is exaggerated by the presence of sub-Antarctic water of low silicate content in the 0-60 m. layer at Sts. 1315 and 1316. When the narrow width of the Antarctic zone in 8o° W is considered the silicate gradient across the zone is very steep. LATITUDE STATION '- OEcisJ. ffltVJ r tyt oj i\j ⢠DECEMBER 1933 © MARCH X SEPTEMBER Lg34 A OCTOBER â NOVEMBER J. Fig. 17. The mean integral average silicate content of the 0-100 m. layer in 8o° W. It is safe to assume that the average silicate content of the 0-100 m. layer in February 1934 at about 66° S was of the order of 1100 mg., and, as we know that in October it was 2000 mg., we may conclude that a minimum net withdrawal of 45 per cent of the available silicate content took place at this latitude. It is impossible to give even an estimate of the consumption at the Antarctic convergence until observations are made in January and more in March. SUB-ANTARCTIC SURFACE WATER PHOSPHATE AND SILICATE CONTENTS AT THE SURFACE Owing to the fact that the majority of the observations by the ships of the Discovery Committee has been made in Antarctic waters, there is not sufficient evidence to give a complete account of the seasonal variation in the nutrient salt content of the surface water in the sub-Antarctic zone. The data that are available were collected chiefly during the circumpolar cruise of 'Discovery II' in 1932. We have more data at the southern end of the zone than just south of the subtropical Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations m
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