Hydrology
Four major water masses originating in the Atlantic and Arctic oceans meet in the Norwegian Sea, and the associated currents are of fundamental importance for the global climate. The warm, salty North Atlantic Current flows in from the Atlantic Ocean, and the colder and less saline Norwegian Current originates in the North Sea. The so-called East Iceland Current transports cold water south from the Norwegian Sea toward Iceland and then east, along the Arctic Circle; this current occurs in the middle water layer. Deep water flows into the Norwegian Sea from the Greenland Sea. The tides in the sea are semi-diurnal; that is, they rise twice a day, to a height of about 3.3 metres.
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