SPATIAL AND TEMPORAL VARIABILITY OF SUSPENDED ORGANIC PHOSPHORUS IN THE NORTH-WESTERN SHELF OF THE BLACK SEA

Kukushkin, A.S.; Parkhomenko, A.V.

SPATIAL AND TEMPORAL VARIABILITY OF SUSPENDED ORGANIC PHOSPHORUS IN THE NORTH-WESTERN SHELF OF THE BLACK SEA

2017

Kukushkin, A.S. | Parkhomenko, A.V.

According to the data of long-term observations, the features of the seasonal variability of the spatial and vertical distribution of a poorly studied component of suspended organic matter - suspended organic phosphorus (РSOM) in the surface layer and in the zone of photosynthesis in the northwestern part of the Black Sea are considered. Statistical estimates of seasonal changes in simultaneously measured concentrations of suspended organic carbon, nitrogen, phosphorus and chlorophyll a and their ratios in the study areas differing in the degree of influence of river runoff and water of open part sea are calculated. In the surface layer of the sea, a comparable distribution of the values of РSOM measured and calculated (from satellite observations and measured concentrations of chlorophyll a) is established. It was obtained that in the western region of the shelf (the area of constant influence of river flow) the maximum values of the РSOM content were recorded in the spring period and in the central region in the summer- autumn period, when the transformed river waters enriched with nutrients come. The consistency of the intra-annual changes in the content of РSOM and the structural indexes of phytoplankton (biomass and chlorophyll a concentration) indicates the role of phytoplankton in the formation of РSOM and its seasonal variability. It is established that the interannual seasonal variability of the РSOM depends on the volatility of the river runoff volume, the extent of its distribution on the northwestern shelf and regional hydrometeorological conditions.

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