. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. ANTARCTIC SURFACE WATER 45 magnitude of these values is correct, phosphate is withdrawn at South Georgia by the plankton to an extent of about 45 per cent of the available content in the surface. The amount withdrawn from the 0-100 m. layer is a little less. At Grytviken, South Georgia, during part of 1925-6, a daily surface sample was taken at high tide and analysed for phosphate content. Although such factors as dilution by land drainage, snow water, glacier ice, and varying contamination duri
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. ANTARCTIC SURFACE WATER 45 magnitude of these values is correct, phosphate is withdrawn at South Georgia by the plankton to an extent of about 45 per cent of the available content in the surface. The amount withdrawn from the 0-100 m. layer is a little less. At Grytviken, South Georgia, during part of 1925-6, a daily surface sample was taken at high tide and analysed for phosphate content. Although such factors as dilution by land drainage, snow water, glacier ice, and varying contamination during the whaling season diminished the value of these estimations, it is considered that the results furnish some indications of the seasonal variation of surface phosphate at one position at South Georgia. The results were plotted as monthly means and are given in graphical form in Fig. 10. izo- m O 2 O 80 60 * -Q MONTHLY AVERAGES MAY i92S • APRIL 1926 -X EXTRAPOLATED VALUES Y - AP R I L '9S5. N FEB MAR APR MAY JUN JUL AUG SEPT OCT NOV DEC ,. JAN FEB MAR APR_ ' \9ziT~ '926 Fig. io. Monthly averages of phosphate content in the surface water at Grytviken, South Georgia in 1925-6. The two surveys of November 1930 and 1933 (Table IV) give an indication of the annual variation of phosphate in the surface layer. If we attempt to compare these November results by reducing the number of stations made in 1930 so that the positions of the stations in the 2 years are more nearly comparable, we find that twenty- three stations in 1930 give an average of 92 mg. for the 0-100 m. layer compared with an average of 109 for twelve stations in 1933. Possible factors which might be responsible for the difference of 17 mg. in these 2 years are difference of average date of the stations involved, meteorological differences, amount of phytoplankton and date of main out- burst in each year, and hydrological differences in the surface layers. The average date the twenty-three stations taken in
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