Long-term evolution and trends of the hydrological and hydrochemical parameters in Bulgarian Black Sea waters during the period 1992-2000

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Courtesy of IWA Publishing

The dynamics of chemical parameters in the Bulgarian Black Sea over the 1990s reflects the complex relations in the ecosystem itself and the influence of the Danube water discharge, which is a major climatic and anthropogenic factor for the Western Black Sea. Analyses of hydrological (temperatures, salinity) and hydrochemical (dissolved oxygen, oxygen saturation, nitrite nitrogen, nitrate nitrogen) data, collected during the period 1992–2000 in the 30-mile zone in front of the Bulgarian Black Sea coast, down to 150 m depth, were carried out in the framework of the DANUBS project. Over 1990s, the winters were gradually becoming warmer, the springs and autumns colder, and the summers short and hot. The long-term averages show spatially a minimum of salinity at 10 miles in front of Cape Galata, whereas in front of Cape Emine salinity gradually increases from the coast towards 30-miles offshore. In the late 1990s, very low summer concentrations or even complete absence of inorganic nitrogen were recorded in front of the Bulgarian Black Sea coast. Seasonally, oxygen has varied in broad terms, however on average the surface waters were saturated or slightly oxygen super-saturated. Down on the vertical, there was a regular decrease of oxygen concentrations.

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