Carbon and nitrogen isotopic ratios of suspended particulate organic matter (SPOM) in the Black Sea water column

Coban-Yildiz, Yesim
Altabet, M
Tuğrul, Süleyman
Carbon and nitrogen isotopic ratios (delta(13)N and delta(13)C) of suspended particulate organic matter (SPOM) in the water column of the Black Sea were measured at a total of nine stations in September-October (autumn) 1999 and May 2001. For comparison, a station in the Mediterranean Sea and one in the Sea of Marmara were sampled in October 1999. Large-sized particle samples, as well as samples of surface sediment were also collected for N and C isotopic analysis. The results revealed important vertical and regional variations in N and C isotopic composition. Seasonal variations in SpOM delta(15)N and delta(13)C were not apparent. SPOM in the euphotic zone (EZ), oxycline, and suboxic/anoxic interface layers of the water column was characterized by distinct isotopic composition. In the EZ, the N and C isotopic ratios of SPOM were in the range typically observed for plankton-derived SPOM in the surface ocean (EZ means ranged from 2.7%. to 5.9%. for delta(15)N and from -24.0 parts per thousand to -21.5 parts per thousand for delta(13)C). Shelf region SPOM had higher delta(15)N and lower delta(13)C (EZ means of 5.9 parts per thousand and -24.0 parts per thousand. respectively). Large-sized particles (LPOM) collected by zooplankton net tows had similar to 3 parts per thousand higher delta(15)N values compared to SPOM, indicating fractionation during trophic transfer of nitrogen. SPOM in the oxycline increased by 3-6 parts per thousand for delta(15)N, while delta(13)C decreased by -2 parts per thousand to -4 parts per thousand, which may be attributed to greater lipid content. In the suboxic/anoxic interface zone, SPOM isotopic ratios (delta(15)N as low as 0.0 parts per thousand to -8.0 parts per thousand) suggest chemoautotrophic production leading to dominance of new, in situ produced organic matter. The location of the most negative delta(15)N values indicates that chemoautotrophic production is most intense at the shelf-break regions, possibly enhanced by mixing of oxygenated and nitrate-rich Mediterranean inflow waters with suboxic/anoxic Black Sea water.


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Coban-Yildiz, Yesim; Fabbri, Daniele; Baravelli, Valentina; Vassura, Ivano; Yilmaz, Aysen; Tuğrul, Süleyman; Eker-Develi, Elif (Elsevier BV, 2006-01-01)
The chemical composition of suspended particulate organic matter (SPOM) in the Black Sea water column has been characterized by pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS). The results are discussed in terms of the hydro-chemical properties of the water column. Phytoplankton cultures grown in the lab also were analyzed to provide reference information for the euphotic zone SPOM. The composition of SPOM in the Black Sea displays important vertical variations dependent on specific distinct bioch...
Distribution of dissolved forms of iron and manganese in the Black Sea
YEMENİCİOĞLU, SEMAL; Erdogan, Selahattin; Tuğrul, Süleyman (Elsevier BV, 2006-01-01)
Dissolved forms of the redox-sensitive elements manganese (Mn-DISS) and iron (Fe(II) and Fe(III)) were measured in the oxic/anoxic transition zone, or suboxic zone, of the Black Sea. An offset was found between dissolved manganese and iron gradients at all stations. In the western cyclonic gyre of the Black Sea, the onset of dissolved Mn (> 0.1 mu M) was located at a density of about sigma(t) = 15.85, where the concentration of dissolved oxygen (DO) was less than 5 mu M. The onset of dissolved Fe(II) (> 0.0...
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The evolution of the Black Sea temperature, salinity and circulation, from large scale to mesoscale, is studied using a data-driven primitive equation simulation. The data are drawn from (i) a basin-wide hydrographic survey, CoMSBlack'92, obtained in the Summer of 1992; (ii) wind stress derived from wind analyses of the Sevastopol MSIA/URHI Office; (iii) climatological heat fluxes; and (iv) climatological river outflows. The primitive equation model is from the Harvard Ocean Prediction System. The simulatio...
ERGIN, M; BODUR, MN; EDIGER, D; EDIGER, V; YILMAZ, A (Elsevier BV, 1993-02-01)
The organic carbon contents and textural composition of a total of 166 surficial sediment samples (from 10 to 1226 m water depths) together with data on primary productivity rates and dissolved oxygen concentrations have been studied to investigate the main controls on the distribution of organic carbon buried within the modern sediments across the Sea of Marmara.
Extension of sea surface temperature unpredictability
Akhmet, Marat; Alejaily, Ejaily Milad (Springer Science and Business Media LLC, 2019-02-01)
The sea surface temperature (SST) variability is clearly affected by global climate patterns, which involve large-scale ocean-atmosphere fluctuations similar to the El Nino-Southern Oscillation (ENSO). We give mathematical arguments for the SST to be unpredictable over oceans. Sensitivity (unpredictability) is the core ingredient of chaos. Several researches suggested that the ENSO might be chaotic. It was Vallis (Science 232:243-245, 1986) who revealed unpredictability in ENSO by reducing his model to the ...
Citation Formats
Y. Coban-Yildiz, M. Altabet, A. YILMAZ, and S. Tuğrul, “Carbon and nitrogen isotopic ratios of suspended particulate organic matter (SPOM) in the Black Sea water column,” DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY, pp. 1875–1892, 2006, Accessed: 00, 2020. [Online]. Available: