Assessment of the trophic status of the Mersin bay waters, Northeastern Mediterranean

Kaptan, Mehmet Salih
Identifying the spatial and temporal variability of eutrophication related indicators such as Chlorophyll-a (Chl-a), oxygen saturation (DO%), dissolved inorganic nitrogen (DIN) and total phosphorus (TP), as a measure of the potential pressures and productivity, were measured within the Mersin Bay, a wide shelf region of the Cilician Basin located in the Northeastern Mediterranean Sea. This study aims to characterize the trophic status of the water masses in the eastern shelf waters of the bay fed by river discharges, through applying cluster analysis, TRIX (using DIN, TP, DO%, Chl-a) and UNTRIX index approaches, based on data collected seasonally in the eastern bay waters between September 2008 and February 2011. Macro-nutrient (DIN, TP, Si) and Chl-a concentrations were found to be 10-fold high in the polluted shallow nearshore waters (<20 m in depth) compared to the offshore (>50 m) surface values. Cluster analysis of all the data highlighted the presence of three different trophic (eutrophic, mesotrophic and oligotrophic) region characteristics. The nearshore zone was assigned as “Eutrophic” whilst the offshore waters displayed “Oligotrophic” properties. Comparison of the TRIX, TRIX-IMS (modified TRIX with site-specific ‘a’ and ‘b’ coefficients) and UNTRIX classification approaches revealed that the original TRIX index was not efficient enough to demonstrate impacts of excessive nutrient loads on the oligotrophic waters whereas the TRIX-IMS and UNTRIX approaches categorized the inner bay water body to have “eutrophic” status compared to the “oligotrophic” waters of the outer bay.


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Yelekçi, Özge; Fach Salihoğlu, Bettina Andrea; Ibello, Valeria; Department of Physical Oceanography (2013)
A three dimensional time-dependent coupled ecosystem model is applied to İzmir Bay for the first time. Delft3D modelling suite’s FLOW and ECO modules are adapted and tuned for the region. A reference model with a time frame of three years is produced that represents the current physical and biogeochemical status of the bay. Model skill assessment methods are used as a measure of model performance and to address the shortcomings of it. The hydrodynamics model is able to produce physical features in terms of ...
ERGIN, M; BODUR, MN; EDIGER, V (Elsevier BV, 1991-02-01)
Surficial sediment samples collected from the northeastern and southwestern shelf regions of the Sea of Marmara, together with data available from other sources, indicate marked variations in sediment compositions resulting from differences in topographical, hydrological and biological conditions. In the strait channels of the Dardanelles and Bosporus, where strong undercurrents prevail, the floor was covered mostly by coarse-grained sediments (rich in sand and gravel). However, in areas of relatively low e...
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Konovalov, S; Samodurov, A; Oguz, T; Ivanov, L (Elsevier BV, 2004-12-01)
New and published data on the distribution and speciation of manganese and iron in seawater are analyzed to identify and parameterize major biogeochemical processes of their cycling within the suboxic (similar to15.6less than or equal tosigma(t)less than or equal tosimilar to16.2) and anoxic layers (sigma(t)less than or equal tosimilar to16.2) of the Black Sea. A steady-state transport-reaction model is applied to reveal layering and parameterize kinetics of redox and dissolution/precipitation processes. Pr...
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Total organic carbon (TOC) concentrations were determined in the Marmara Sea and both oxic and anoxic waters of the Black Sea, using the Shimadzu high-temperature catalytic oxidation technique and the Technicon persulphate-UV oxidation method. The TOC values in the deep waters of the Marmara Sea ranged between 60 and 73 μ MC by the Shimadzu technique and from 40 to 50 μMC by the Technicon method. The TOC values obtained by both methods in the deep anoxic waters of the Black Sea varied between 105 and 130 μM...
OGUZ, T; SUR, HI (1989-01-01)
Water exchange through the Dardanelles Strait is studied by a two-layer model which considers the laterally averaged flow formed by two homogeneous layers of differing density separated by an entraining interface. The model response is discussed in terms of observations from the strait. In particular, the observed asymmetry and rapid transition at the interface depth as weil as the intense mixing which occurs in the southwestern reaches of the strait are found to be related to the hydraulic characteristics ...
Citation Formats
M. S. Kaptan, “Assessment of the trophic status of the Mersin bay waters, Northeastern Mediterranean,” M.S. - Master of Science, Middle East Technical University, 2013.