. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. ANTARCTIC SURFACE WATER SEASONAL VARIATION OF PHOSPHATE IN THE SURFACE LAYER IN 8o° W In 8o° W a series of observations for phosphate and silicate analysis were made in five months in 1933-4, since the phosphate results of December 1933 were found to be inaccurate only those taken in 1934 have been examined. The mean integral averages of the 0-100 m. layer have been plotted and are shown in Fig. 16. Discussion of these averages is handicapped by variation of the latitude of the ice-edge an
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. ANTARCTIC SURFACE WATER SEASONAL VARIATION OF PHOSPHATE IN THE SURFACE LAYER IN 8o° W In 8o° W a series of observations for phosphate and silicate analysis were made in five months in 1933-4, since the phosphate results of December 1933 were found to be inaccurate only those taken in 1934 have been examined. The mean integral averages of the 0-100 m. layer have been plotted and are shown in Fig. 16. Discussion of these averages is handicapped by variation of the latitude of the ice-edge and of the Antarctic convergence, and the narrowing of the Antarctic zone in 8o° W due to geographical features. The ice-edge in March 1934 was some 280 miles farther south than in September 1934, and the Antarctic convergence was over 60 miles farther south in March than in September. In September and October the concentration of phytoplankton in LATITUDE 66 S STATION n ° T 1 rr SEPTJjOCT JNCN [MAR 6,2° 60° (n't i^t 5£?S o-x - O MARCH 1934 X SEPTEMBER 1334 A OCTOBER 1934 â NOVEMBER 1934 O 0-~. Fig. 16. The average phosphate content of the o-ioo m. layer in 8o° W. the Antarctic surface water was very small, and even in November the main outburst had hardly started; the March observations were made after the peak concentration of phytoplankton in the far south. At the Antarctic convergence in 8o° W very little variation of phosphate content occurred in the o-ioo m. layer in the months of September, October and November, whilst farther south, October averages were higher than in November. We have no results for the critical period of early January to late February which would show the effect of the peak concentrations near the convergence and at the ice-edge, and hence only a very approximate estimate of the consumption of phosphate can be made. The March observations were interesting because in the far south they show some effect of the peak conce
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