Published December 31, 2012 | Version v1
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Total Organic Carbon (TOC) of the surface layer sediments covering the seafloor of the Romanian Black Sea coast

Creators

  • 1. National Institute for Marine Research and Development „Grigore Antipa”, Constanţa, Romania
  • 2. National Research and Development Institute for Marine Geology and Geoecology – GeoEcoMar, Constanţa Branch, Romania

Description

Abstract. The paper presents the distribution of the Total Organic Carbon (TOC) in the surface layer sediments of the Black Sea Romanian shelf, since September 2009 to September 2010. The study is based on the analysis of samples from 21 stations. The results have led to the following conclusions: the TOC content in the surface sediments revealed values in the range undetectable“ up to 14.94% (mean 3.38%, median 3.28%, standard deviation 2.70%). The values generally highlighted a gradient increasing with distance from the shore and, at the same time, nearby the Danube’s mouths, with the fine sediment fractions increase. Statistically, the TOC content of the stations under the direct influence of the river discharge was significantly higher in 2010 than 2009, due to the historical raised flow of the Danube. The spatial and temporal distribution of TOC content showed also high values in the Constanța area, in late summer, due to the increased river discharge in 2010, algal blooms and the anthropogenic influence of the wastewater treatment plants.

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