Ermiş, Esra
The biogeochemical cycling of iron (Fe) can play a potentially important role in the oligotrophic Mediterranean Sea. This importance stems from: (i) iron is an essential micronutrient for the new production, and (ii) it is associated with other essential redox-sensitive elements including carbon, nitrogen, oxygen and trace metals. Organic carbon burial in seafloor promotes the formation of gradients of iron and manganese species due to their role as electron acceptor for microbial respiration. The fraction of Fe and Mn species that is readily available for microbes is referred as reactive Fe and Mn, which comprise various labile forms of oxyhyroxides that could be extracted by a citrate-buffered dithionite solution. This thesis reports the first geochemical distribution of reactive iron and manganese, accompanied by other total metal distributions and their reactive-total partitioning in 25 surface sediment samples taken from four transects in Mersin Bay from Seyhan River to the Aydıncık. The coastal samples are taken from 10-100 m depth of a transect affected mainly by Seyhan and Berdan rivers in the Mersin Bay, and two transects along Göksu River. The deep-seafloor samples are obtained from a depth between 100-500 m in two transects offshore Erdemli and Göksu. The reactive iron in Cilician basin surface sediments is diversely distributed. Reactive iron enrichment decreases with depth whereas Mn enrichment significantly increases towards the open sea. FeR has significant correlation with organic carbon in Aydıncık transect. There is significant positive correlation between organic carbon and % mud fraction in Aydıncık transect. Each transect differs in biogeochemical properties of seawater and seafloor. The spatial biogeochemical gradient from coastal to deep seafloor could be seen more clear in Aydıncık and Göksu transects, hinting at coast to offshore transport of riverine reactive iron and manganese.


Atmospherically-transported trace metals can play an important role in biogeochemical cycles in the Mediterranean Sea. However, although the magnitude of trace metal air to sea fluxes is initially dependent on the metal concentrations in the air, it is the ''chemical character'' of the aerosol which constrains the fate of the metals in sea water; for example, the solubility of trace metals is considerably greater from anthropogenic than from crustal components. To a first approximation the chemical composit...
Major Bottom Water Ventilation Events Do Not Significantly Reduce Basin-Wide Benthic N and P Release in the Eastern Gotland Basin (Baltic Sea)
SOMMER, Stefan; CLEMENS, David; Yücel, Mustafa; PFANNKUCHE, Olaf; Hall, Per O. J.; ALMROTH-ROSELL, Elin; Schulz-Vogt, Heide N.; Dale, Andrew W. (2017-01-01)
Redox-sensitive mobilization of nutrients from sediments strongly affects the eutrophic state of the central Baltic Sea; a region associated with the spread of hypoxia and almost permanently anoxic and sulfidic conditions in the deeper basins. Ventilation of these basins depends on renewal by inflow of water enriched in oxygen (O-2) from the North Sea, occurring roughly once per decade. Benthic fluxes and water column distributions of dissolved inorganic nitrogen species, phosphate (PO43-), dissolved inorga...
Evaluation of tsunami scenarios for western Peloponnese, Greece
Yalçıner, Ahmet Cevdet; Dilmen, D. I.; Aytore, B.; Ayca, A.; Insel, I.; Zaytsev, A. (2014-06-01)
Tsunami hazard assessment of the eastern part of the Mediterranean Sea is the current interest of the countries having, a coastline in this region. Considering today's increasing population on the coasts and historical tsunamis, it is essential to estimate the probable tsunami risk, which might occur, to be able to mitigate the risk before the actual tsunami event happens. For this purpose, European Union funded project., SEAHELLARC is formed to develop a methodology and tools for seismic and tsunami safety...
Spatial and temporal variability in the chemical properties of the oxic and suboxic layers of the Black Sea
Tuğrul, Süleyman; Murray, James W.; Friederich, Gernot E.; Salihoglu, Ilkay (Elsevier BV, 2014-07-01)
The Black Sea, a land-locked deep basin with sulfide bearing waters below 150-200 m, has been subject to anthropogenic pressures since the 1970s. Large inputs of nutrients (nitrate - N, phosphate - P, silicate - Si) with high N/P but low Si/N ratios and subsequent development of intensive eutrophication over the basin have changed vertical distributions and inventories of nutrients and redox-sensitive metals in the oxic, suboxic and anoxic layers. Chemical data sets obtained between 1988 and 2010, and older...
Tectonic history of basins sited along the western section of the North Anatolian Fault System, Turkey
SARP, Gülcan; Gurboga, Sule; Toprak, Vedat; Duzgun, Sebnem (2014-01-01)
Geological and geomorphological features of basins along the western half of the North Anatolian Fault System (NAFS) are used to constrain the formation of these basins by localization of deformation and the total displacement, and to determine the timing of basin development. In this study, tectonic influence direction of the NAFS on tectonic and hydrologic basins Bolu, Yenicaga, Dortdivan, Cerkes, Ilgaz and Tosya has been investigated to deduce information about the formation stages and interaction betwee...
Citation Formats
E. Ermiş, “SPATIAL VARIATIONS OF SEAFLOOR IRON CYCLE IN CILICIAN BASIN (EASTERN MEDITERRANEAN),” M.S. - Master of Science, Middle East Technical University, 2017.