Article for IAS/PCS - Gulf Stream


Gulf Stream

·         The  Gulf Stream, a current in the middle of the Atlantic, at the level of the equator.

·         The surface layer of water, heated by the Sun, moves north along the east coast of North America towards Greenland.

·         During this long journey, it slowly loses its heat through evaporation, which consequently means that its salt content increases.

·         At the Grand Banks, it branches, one current moving eastwards as the

·         North Atlantic Drift, the other turning south-east back towards the mid Atlantic.

·         On reaching the Labrador Sea, however, it descends under the ice, because of its higher density.

·         So this mid-Atlantic current, now cold, travels south following the bottom of the Atlantic Ocean until it reaches Antarctica, where it grows even colder.

·         On the way, it is enriched by water flowing out of the Mediterramean.

·         This water, denser because it is richer in salt, passes under the Atlantic surface waters, giving rise to another current at medium depth.

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