The method of two-dimensional isopycnic analysis is applied to study the distribution of inorganic phosphates and nitrates in the Black Sea. The effect of winter-time ventilation in the central sea on the formation of chemical fields is examined, as well as the outcropping of biogenic elements from the layer of high concentrations (σ t∼14.5–16.0). It is demonstrated that the amount of nitrates entering the upper active layer of the sea as a result of winter-time convective ventilation may attain values comparable with their overall annual input by river discharge, and that they control the intensity of winter-spring phytoplankton blooming in the central sea. The spatial variability of the vertical phosphate distribution is analysed. For the annual cycles with fairly cool winter conditions, an occurrence of three peaks on the phosphates vertical profile in spring has been documented over a vast sea area where the rim current represents an external dynamic boundary.
Physical Oceanography – Springer Journals
Published: Oct 23, 2006
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