The amount of salt in the ocean, known as ‘salinity’, is a measure of the of the amount of salt (in grams) dissolved in 1000 grams of water. So, the amount is expressed as parts per thousands. Refractometers are a tool used to measure the amount of salinity in the ocean. The salinity in the ocean is approximately 32 to 35 parts per thousand. Freshwater has a salinity. The estuaries fluctuate their salinity level depending upon the tides. But, it’s always below the open ocean. The poles have a lower salinity because the cold water does not evaporate as fast.
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- Ocean salinity trends show human fingerprint (environmentalresearchweb.org)
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