. Fig. 54. Distribution of phosphate (mg. ats. ). Section off Sylvia Hill, 25-27 September 1950, survey II. Positions of stations are shown in Fig. 2. oxygen minimum layer, and the phosphate concentration more often increases almost regularly to greater depths. The maximum concentration is reached in the antarctic intermediate water. In the layer of minimal oxygen, however, the inorganic phosphate concentration reaches values of about 2-0 mg. ats. With upwelling, this extremely phosphate-rich water is brought up on to the continental shelf, where it provides the necessary nutriment
. Fig. 54. Distribution of phosphate (mg. ats. ). Section off Sylvia Hill, 25-27 September 1950, survey II. Positions of stations are shown in Fig. 2. oxygen minimum layer, and the phosphate concentration more often increases almost regularly to greater depths. The maximum concentration is reached in the antarctic intermediate water. In the layer of minimal oxygen, however, the inorganic phosphate concentration reaches values of about 2-0 mg. ats. With upwelling, this extremely phosphate-rich water is brought up on to the continental shelf, where it provides the necessary nutriment and permits the growth of the heavy crops of phytoplankton in the coastal waters. In several of the sections it will be apparent that the
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