Features of the regional balance of inorganic carbon of marine ecosystems under anthropogenic pressure (in Russian)

The global changes in the biogeochemical structure of the oceans, which are most pronounced on a regional scale, caused by an increase in the flow of carbon into aquatic ecosystems as a result of increased releases from the atmosphere, coastal sources, primary production and destruction processes in the marine environment, make the issues of sharing the influence of the natural climatic and anthropogenic factors. For a quantitative assessment and analysis of the degree of influence of factors leading to the transformation of the natural carbon cycle, it is necessary to restore its budget, which is determined by the intake and removal of carbon, as well as the processes that result in its redistribution between different forms. The paper estimates the carbon budget for the ecosystem of the Sevastopol Bay (Black Sea), as well as analyzes the contribution of the anthropogenic component according to many years of research (2007–2018) of hydrochemical and geochemical characteristics. The results of studying the carbonate system of bottom sediments are presented: the vertical profile of the total dissolved inorganic carbon, alkalinity and pH, as well as the ratio between dissolved inorganic carbon and alkalinity. It has been established that the oxidation of organic matter occurs predominantly under anaerobic conditions. The values ​​of the flux of total dissolved inorganic carbon ( J TCO2 ) at the water-bottom boundary are directed from the bottom sediments to the bottom layer of water and are J T CO2 = 0.42 … 0.61 mol / (m 2 ∙ year). An analysis of the various components of the inorganic carbon budget showed that the largest role is played by anthropogenic sources, whose contribution is at least 75% of the total inorganic carbon supply. By the value of the total stock of dissolved inorganic carbon and its removal to the open sea, it was suggested that the time for the complete renewal of the waters of the Sevastopol Bay is 2 years 4 months.

Orekhova N. A., Konovalov S. K. & Medvedev E. V., 2019. Features of the regional balance of inorganic carbon of marine ecosystems under anthropogenic pressure. Marine Hydrophysical Journal 35 (3): 248–260. Article (subscription required).

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