Changing the salinity of the oceans

22.12.2003

Changing the salinity of the oceans

22.12.03, the


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Over the past 40 years, the ocean water in the tropics has become much saltier and closer to the poles — desalination, said researchers from the Woods Hole Oceanographic Institution (USA), Centre for Environment, Fisheries, and Aquaculture Science (UK) and the Bedford Institute of Oceanography (Canada) . These large-scale and relatively rapid changes suggest that recent climate change, including global warming, may alter the fundamental Obscheplanetnaya system that regulates evaporation, precipitation and circulation of fresh water on the planet.
The acceleration of the global water cycle, the researchers noticed, may affect the distribution of rainfall, which in turn can exacerbate global warming by increasing the amount of water vapor in the atmosphere, itself a potent greenhouse gas. This will contribute to the continuation of desalination of North Atlantic — to such a degree that can lead to changes in the routes of ocean currents and cause further climate change.
The oceans contain 96% of the water on Earth, they accounted for 86% of vapor on the planet and 78% of rainfall. As the evaporation surface in a concentrated salt water, increasing the rate of evaporation increases the salinity. Decrease in salinity indicates increased precipitation and runoff from the continents.
The study authors analyzed the results of long-term measurements of salinity in the Atlantic stretching from Greenland to South Africa. The analysis showed that the Atlantic water masses are changing — and in some cases considerably — the last five decades, which has regular information. The water in the tropical and subtropical parts becomes much saltier, and in the upper latitudes salinity decreases. This trend accelerated in the 1990s, when there were ten hottest years since 1861. In the tropics, salinity has increased by 5-10%. This means that fresh water is transferred from the equator to the poles with increasing velocity greater than the capacity of the river to the opposite movement.
What can it lead to, one can only guess

 

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