Discovery reports (1940) Discovery reports discoveryreports19inst Year: 1940 ANTARCTIC SURFACE WATER Si stations on the two lines, Sts. 1328 and 1331, for example, are respectively 117 and 79 mg. This difference of phosphate values must be due to earlier differences in concentration of phytoplankton in the far south of each line of stations. It cannot be said that the phosphate content disparity is due to differences of concentration of phytoplankton in situ because at both stations the phytoplankton catches in late March and early April were negligible. Nevertheless I think that there had b
Discovery reports (1940) Discovery reports discoveryreports19inst Year: 1940 ANTARCTIC SURFACE WATER Si stations on the two lines, Sts. 1328 and 1331, for example, are respectively 117 and 79 mg. This difference of phosphate values must be due to earlier differences in concentration of phytoplankton in the far south of each line of stations. It cannot be said that the phosphate content disparity is due to differences of concentration of phytoplankton in situ because at both stations the phytoplankton catches in late March and early April were negligible. Nevertheless I think that there had been some influence of Weddell Sea water in the surface layer at St. 1328, the most southerly station south of the Falklands, because the mean value of the 0-100 m. layer silicate content was so much greater than that of the stations north of it. The absence of December or January observations prevents any estimation of the net withdrawal of phosphate in these observations. SEASONAL VARIATION OF SILICATE IN THE SURFACE LAYER IN THE SCOTIA SEA The available data are restricted to a line of stations between South Georgia and the Falklands, three sets of observations from the South Orkney Islands northwards to the LATITUDE STATION 60°5 SB' 56° I* 54 rial en S2 D jan 11 oct Tap Ito4-!33S 52° in rig in <T W 2000- a (J) s ID O APRIL 1934 X OCTOBER. 1934 A JANUARY 1935 JANUARY SURFACE Fig. 14. Surface silicate content and the average silicate content of the o-ioom. layer from the South Orkney Islands northwards to the Antarctic convergence. Antarctic convergence, and two lines of stations between the Falklands and Elephant Island. Between South Georgia and the Falkland Islands in October 1934 the surface value of silicate content was of the order 1000 mg. in the Antarctic zone. North of the South Orkneys the observations were made in January, April and October and are shown in graphical form in Fig. 14. As with the phosphate distribution, the silicate content in 7 2
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