Over the past 50 years, the salty parts of the oceans have become  saltier and the fresh regions have become fresher, and the degree of  change is greater than scientists can explain.
Researchers are heading out into one particularly salty ocean region,  in the middle of the North Atlantic Ocean, in the hopes of better  understanding what drives variation in salinity in the upper ocean.
Ocean Salinity Change Spurs Expedition | LiveScience
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