Environmental Degradation of the Black Sea: Challenges and by Naci Görür (auth.), Sükrü T. Beşiktepe, Ümit Ünlüata,

By Naci Görür (auth.), Sükrü T. Beşiktepe, Ümit Ünlüata, Alexandru S. Bologa (eds.)

The Black Sea almost immediately faces critical ecological disequilibrium due essentially to eutrophication and different sorts of contaminants, from atmospheric, river and landbased assets. significant contaminants comprise nutrition, insecticides, hydrocarbons and heavy metals. one of the most important modern matters are eutrophication and linked deterioration of water caliber, plankton blooms, hypoxia and anoxia, lack of biodiversity and decline of residing assets. a greater realizing of stipulations resulting in eutrophication and of the linked alterations over the past 4 a long time, is being performed at nationwide , neighborhood and overseas degrees. top of the range clinical study has been carried out in all Black Sea riparian nations (Bulgaria, Georgia, Romania, Russian Federation, Turkey, Ukraine). moreover, numerous profitable nearby learn programmes (e.g., CoMSBlack, NATO-TU Black Sea, NATO-TU Waves, EC-EROS 2000 section III, IOC­ Black Sea local middle with Pilot tasks 112) and one significant environmental administration application (GEF-BSEP) were effectively introduced. New foreign efforts just like the Black Sea fee, the Black Sea application Coordination Unit, the Black Sea fiscal Cooperation (all positioned in Istanbul), including the conference for the security of the Black Sea opposed to pollutants (Bucharest, 1992) and the Odessa Interministerial Decleration (1993) attest to the industrial and political value of those difficulties and the eye shortly paid to this endangered sea.

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O 1 Z ,''I'' ,'6 .. 4 surface where nonnal, well established TNO x peak was positioned. This erosion of upper nutricline can not be due to simple dilution effect of vertical mixing, because there should be an increase in the DO concentration in parallel to the reduction in TNOx concentration due to the entrainment of oxic waters. If these types events are repeating regularly or randomly at about decadal frequency, then the low TNO x concentrations measured in 1960s can be attributed to such episodic events 51 which may influence nearly the whole basin in 1960's; even though the event observed in July-1992 was confined to offshore waters of the southern Black Sea.

YLSBURV-85 •• ATLANTIS xx BILl"" 00 165 BILIM -69 -91 -94 FIgure 6 Potential denSity dependent vaflatlOns of dissolved oxygen Black Sea for different peflods. '" '" o sa °2(uM) tDD 15D :taD Zia IDD IDD .. the western inteflor of the ". lli:i:5 ~ ~ 'Ii SO -< HiP'S 1700 1115 0 .. , ~ 150 Z5 .. 51001251501152oo ~> ,,, ~ "-\. <"i\, .. 1 '" 170 -+ ,. 5)1M ... 2. o 1 Z ,''I'' ,'6 .. 4 surface where nonnal, well established TNO x peak was positioned. This erosion of upper nutricline can not be due to simple dilution effect of vertical mixing, because there should be an increase in the DO concentration in parallel to the reduction in TNOx concentration due to the entrainment of oxic waters.

The accumulation of shells on the beach took place irregularly not only from one year to another but also from one month to another (Fig. 7). Although in the late 1970s Mya arenaria population contributed on average 2,400 tons of shells per km per year, today this contribution is very low according to the precarious state of the benthic ecosystem. The second example refers to the accumulation on the littoral sea floor of the Mya arenaria shells, as a result of mass mortality of benthic organisms.

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