The Mediterranean sea stretches from West to East from 5.5° W D. to 36° e and is located between the Parallels of 30 and 45° N. lat. Its southern coast belongs to the African continent, and the Western, Northern and Eastern Eurasia. This is the most secluded pool of the World ocean (Fig. 2.15). It belongs to the Atlantic ocean, but connected with it only by the narrow Strait of Gibraltar with depths of from 280 to 320 m In the North-East through Dardanely, the Marmara sea and the Bosphorus. where the depth reaches only 50-60 and 30-40 m respectively, it communicates with the Black sea. It is believed that the limited water exchange with other basins of the World ocean is one of the main reasons for the formation of the special hydrological regime. This understanding is based on the decisive role of the thermohaline circulations in the dynamics of the sea.
The Mediterranean sea is composed of many separate parts. Tyrrhenian sea, the Algerian-Provencal basin, the Alborán sea, Balearic (Iberian) sea, Gulf of lion, Ligurian sea, the Central basin (between the Sicilian Straits and the Cretan-African channel), Adriatic sea, Levantine Sea, Aegean sea (has a lot of Islands, and complex bottom topography). The Aegean sea are divided into 3 pools. Athos in the North, Chios in the middle part and most glubokinsky pool. Continue reading
Greenhouse gas emissions in the coming decades could have a significant impact on oceanic life forms, with such dire predictions were made by the expert on marine biology Michael Beeman from the University of California in Merced. – Concern about this issue in informed circles is growing because human activity is very rapidly changes the pH (acidity) in the oceans. And although we don’t know what will be the final effect of changing the nitrogen cycle, the experiments are being conducted worldwide, and based on them we can assume that the effect will be global.
According to him, the growth of carbon dioxide emissions, increased by the burning of fossil fuels and other human activity increases the acidity of water, which, in turn, significantly alters the nitrogen cycle in the sea. And because nitrogen is an essential nutrient for living organisms, although, as it turned out recently, some life forms can adapt to other elements, eventually the process will affect all forms of marine life, reports innovanews .
During his research Dr. Beman lowered the pH of water at six different sites in the Atlantic and Pacific oceans. In each case, when pH was lowered, and decreased generation of oxidized forms of nitrogen, which usually uses phytoplankton and drugability. This nitrogen is produced through the oxidation of ammonia in sea water by microorganisms. According to the scientist, these results can be used to assess the potential impact of oxidation on the nitrogen cycle in the sea and marine life forms in General. But the observed effects require additional research. Continue reading