Title: Assessment of Large Scale Eutrophication Driven Oxygen Depletion Risk in the Black Sea
Citation: Proceedings of the 1st Biannual Scientific Conference Black Sea Ecosystem vol. 1 p. 210-225
Publisher: Commission on the Protection of the Black Sea against Pollution
Publication Year: 2008
JRC N°: JRC33363
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC33363
Type: Articles in periodicals and books
Abstract: During the last three decades anthropogenic eutrophication has been identified as a key ecological problem for the coastal Black Sea region (especially its North-Western (NW) part subjected to the strong influence of freshwater input), resulted in dramatic alterations in the chemical and biological regimes.Depending on meteorological, hydrothermal, and hydrobiological conditions during summer/autumn, oxygen deficiency (hypoxia or anoxia) and mass mortality caused by eutrophication have become an annual event in the NW shelf area where anoxic zones expanded from covering 3 500 km2 in 1973 to 40 000 km2 in 1990. In the 1970s-1980s, increased nutrient input via the major rivers resulted in strong eutrophication of the shallow Northwestern/Northern Black Sea. An urgent need for a harmonization of criteria and indices at the European scale applied at basin scale is expressed by decision makers and the scientific community in order to compare the status and trends of eutrophication. In this paper, a complementary pair of advanced eutrophication (risk) indices for coastal marine areas for application at the European scale is proposed. The Physically Sensitive Area index to eutrophication (PSA) based on 3D hydrodynamic modeling demonstrates the wide variability in the physical resistance of coastal European regions to the eutrophication phenomena. The Oxygen Depletion Risk index (OXYRISK) represents the most probable oxygen deficiency distribution near the bottom integrating data from physical modeling and satellite-derived chlorophyll-a, the latter being considered as the main source of organic matter.
JRC Directorate:Sustainable Resources

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