Climatic characteristics of a ph in the waters near Danube river and its seasonal variability

A.B. Polonsky, E.A. Grebneva

Institute of Natural and Technical Systems, RF, Sevastopol, Lenin St., 28

E-mail: apolonsky5@mail.ru, lenagrebneva12@gmail.com

DOI: 10.33075/2220-5861-2020-1-109-116

UDC 551.464.6/465.4(262.5)

Abstract:

     Based on the massive of archival data of the Institute of Natural and Technical Systems for the period from 1960 to 2000, large-scale structures of the pH field and the seasonal variation in the water area of the estuary near the river Danube are described. Spatially heterogeneous pH values of the study water area are determined by biological processes in the mixing zone of river and sea waters while in the immediate vicinity of the delta of the river Danube they are due to characteristics of the river water. The range of climatic pH values varies between 8.42-8.47 with an average of 8.46 units in the field pH. The maximum values (8.45–8.47 pH units) are concentrated in the region of transformation and mixing of river and sea waters. Near the delta of the river Danube (in the area of river water prevalence) lower values of 8.42-8.44 pH units are located. The seasonal dynamics of pH is largely determined by the seasonal cycle in the development of bio-production processes that depend on temperature conditions and vertical stratification, which are significantly affected by the volume of the river water flow. From winter to summer, a gradual increase in values begins, and then their decrease towards autumn. The range of the averaged seasonal variability of the pH value is 0.22 units. The correlation function characterizing the impact of costs of the Danube on pH, reaches its maximum during a  time shift (delayed pH) for two months.

Keywords: pH, Black Sea, seasonal course, pH field, the estuary of the Danube.

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[IEEE] A. B. Polonsky and E. A. Grebneva, “Climatic characteristics of a ph in the waters near Danube river and its seasonal variability,” Monitoring systems of environment, no. 1, pp. 109–116, Mar. 2020.

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