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Variability of nutrients and the carbonate system components in the Sevastopol Bay is considered based on the hydro and -chemical surveys’ data obtained in Marine Hydrophysical Institute in 2007– 2016. Their inter-annual and seasonal variations are assessed proceeding from the nutrients’ data and carbonate system components. Our results permit to draw a conclusion that the anthropogenic component constitutes a predominant pressure upon the ecological state of the Sevastopol Bay. At that spatial distribution of the nutrients and the carbonate system components is also conditioned by the Chernaya River fresh waters in the inner part of the bay. It is shown that organic matter oxidation and the carbonates‘ dissolution resulting from strong eutrophication determine the modern state of the carbonate system in the Sevastopol Bay. The decreasing difference between the atmospheric and surface waters pCO2 provides the basis at which the bay ecosystem can soon become a source of carbon dioxide. The conclusion is that shift of equilibrium towards predominance of the organic component in the natural cycles, as well as the increasing anthropogenic influence upon the Sevastopol Bay ecosystem can negatively affect both its ecological and recreational status.

Current hydrochemical regime of the Sevastopol Bay