Chemocline chemistry

The chemocline is the borderline between the upper oxygen-containing (oxic) seawater and the sulfide-containing (anoxic) seawater below, i.e. the borderline between the living and dead sea. The three most studied waters with more or less permanent chemoclines are the Black Sea, the Baltic Sea at the Gotland Deep and the Norwegian fjord Framvaren. All these three waters were created during the latest deglaciation some 8000 to 10000 years ago. Any change in the nutrient load or the meteorological and hydrological conditions will shift the depth of the chemocline and thus the living conditions for the marine life