. &!c? suRFACe x- - ~_~_-JT<X SEPT SURFACE*" SEPTEMBER SURFACE and 0-100 MARCH_0^120_-G MARCH SUR?ACE ' Fig. 15. Surface silicate content and the average silicate content of the o-ioom. layer between the Falkland Islands and Elephant Island. value at the most southerly station in April is due to the presence of Weddell Sea water close to the South Orkney Islands. The January values probably approach very closely to the minimum concentration of silicate in the surface layer of the Scotia Sea, and, in the absence of observations earlier than October, we can say that a minimum of abou
. &!c? suRFACe x- - ~_~_-JT<X SEPT SURFACE*" SEPTEMBER SURFACE and 0-100 MARCH_0^120_-G MARCH SUR?ACE ' Fig. 15. Surface silicate content and the average silicate content of the o-ioom. layer between the Falkland Islands and Elephant Island. value at the most southerly station in April is due to the presence of Weddell Sea water close to the South Orkney Islands. The January values probably approach very closely to the minimum concentration of silicate in the surface layer of the Scotia Sea, and, in the absence of observations earlier than October, we can say that a minimum of about 50 per cent of the available silicate is withdrawn during the phytoplankton season at the south of the Scotia Sea, and something approaching 80 per cent in the north. Between the Falkland Islands and Elephant Island there are only two sets of data, one obtained in March 1934 and the other in September 1934, each set of observations having been made immediately previous to those in April and October north of the South Orkneys. They are shown in graphical form in Fig. 15. Considerably less silicate exists in the west of the Scotia Sea than north of the South Orkneys. In general the September values are greater than the March ones and must approach the maximum values in this position during the year. Considerably more data are required on this line of stations before seasonal variation in the western part of the Scotia Sea can be discussed.
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