VARIABILITY OF HYDROCHEMICAL AND HYDROLOGICAL CHARACTERISTICS IN THE SOUTHWESTERN PART OF THE CRIMEAN COASTS
2019
Kukushkin, A.S. | Parkhomenko, A.V.
According to the data of long-term (1970-1996) observations, the spatio-temporal variability of hydrochemical (phosphates, nitrates, silicic acid and dissolved oxygen) and hydrological (salinity, temperature) parameters in the southwestern part of the Crimean coast is considered. Homogeneity of their seasonal spatial distributions and insignificant differences in concentrations in the surface layer are noted. The analysis of the temporal variability and the vertical structure of the hydrochemical and hydrological characteristics in the 0-100 m layer in the north- western and southern sections of the investigated region made it possible to reveal the increase in the content of phosphates, silicic acid, and the decrease in the concentration of dissolved oxygen in the surface (0 m) and lower (50-100) m) layers, as well as the decrease in salinity values in the surface layer during the summer period. In the vertical distribution of the studied parameters in the 0-50 m layer in winter (February) and in the 0-10 m layer in summer (August), a homogeneous character was observed. With increasing depth, the concentration of biogenic elements and the salinity of the water increased monotonically, and the concentration of dissolved oxygen and water temperature decreased. The increased phosphate content in the annual cycle in the 1980-s was observed with a simultaneous decrease in salinity and water temperature. An increase in the phosphate concentration in the coastal zone of the study area at the end of the 20-th century was not revealed.
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