Investigation of the field of colored dissolved organic matter concentration and its relationship to the salinity field in Dnieper-Bug estuary

by

P.D. Lomakin1,2

1Marine Hydrophysical Institute of RAS, Russian Federation, Sevastopol, Kapitanskaya St., 2

2Institute of Natural and Technical Systems, RF, Sevastopol, Lenin St., 28

E–mail: p_lomakin@mail.ru

DOI: 10.33075/2220-5861-2021-2-72-80

UDC 504+551 465

Abstract:

   Based on the data of the expedition carried out in August 2012, the features of the structure of the salinity and fDOM concentration fields, as well as the correlation between these values ​​in the Dnieper-Bug estuary, are analyzed. It is shown that the salinity field in the Dnieper-Bug estuary is characterized by all structural features typical of coastal sea areas freshened by river runoff, while the fDOM concentration field has anomalous properties due to the presence of an anthropogenic component of this value. The presence of fDOM of anthropogenic origin is most significant in the western part of the Dnieper estuary and is related to the influence of the city and port of Ochakov. The maximum content of fDOM was recorded here, which caused an anomalous horizontal distribution of this substance concentration, increasing from the mouth of the Dnieper to the open Black Sea waters. The contaminated areas of the studied water areas, which are adjacent to settlements and occupy the predominant part of the water surface of the Dnieper-Bug estuary, are characterized by an increased fDOM content and intrusive feature of the vertical structure of this substance concentration field of. It is revealed that in the Dnieper-Bug estuary there is no inverse correlation between the salinity fields and fDOM concentration, which is typical for unpolluted coastal waters, freshened by river runoff. A similar anomaly is an indicator of the pollution of coastal waters with organic matter.

Keywords: salinity, colored dissolved organic matter, pollution, Dnieper-Bug estuary.

To quote: Lomakin, P.D. “Investigation of the Field of Colored Dissolved Organic Matter Concentration and Its Relationship to the Salinity Field in Dnieper-Bug Estuary.” Monitoring Systems of Environment no. 2 (June 24, 2021): 72–80. doi:10.33075/2220-5861-2021-2-72-80.

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