. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 24 DISCOVERY REPORTS The mean value between o-ioo m. has been selected because this layer with very few exceptions consists of true Antarctic surface water unmixed with the upper layers of the warm deep water. The mean values so obtained were averaged over two-monthly periods and plotted against the various months of the year. Having regard to the considerable differences in the actual phosphate content across such a large area as the Antarctic zone which stretches from the ice-edge to the Antar
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 24 DISCOVERY REPORTS The mean value between o-ioo m. has been selected because this layer with very few exceptions consists of true Antarctic surface water unmixed with the upper layers of the warm deep water. The mean values so obtained were averaged over two-monthly periods and plotted against the various months of the year. Having regard to the considerable differences in the actual phosphate content across such a large area as the Antarctic zone which stretches from the ice-edge to the Antarctic convergence, together with the differences in the concentrations of phytoplankton throughout the zone, it was decided to draw two seasonal curves: one, the curve for the northern region constructed from the results of stations within a distance of 300 miles south of the Antarctic convergence; the second, a curve for the southern region made from values at stations within 200 miles of the ice-edge. These curves are shown in Fig. 7; the numbers opposite the points on the curves give the numbers of observations from which each two-monthly average is calculated. No curve has been constructed for the area between the southern and northern regions of the Antarctic zone because at present our observations in this area are not sufficiently numerous. 120 \4l HO o 2 2 |.T<t 100- 90. NORTHERN REGION SOUTHERN REGION SEPT OCT NOV DEC JAN FEB MAR APR MAY Fig. 7. The average phosphate contents of the o-ioom. layer in the southern and northern regions in the Antarctic zone of the Southern Ocean. In the curve for the southern region it will be noticed that the average phosphate content of the 0-100 m. layer falls from August to the end of October, then rises slightly during November, falls again to mid-January and then rises until the end of May. We have no results for July, and consequently the June-July and July-August averages cannot be calculated. The January-February average
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