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Evaporation of ocean water and formation of sea ice both increase the salinity of the ocean. However these salinity raising factors are continually counterbalanced by processes that decrease salinity such as the continuous input of fresh water from rivers, precipitation of rain and snow, and melting of ice.vaporation of ocean water and formation of sea ice both increase the salinity of the ocean. However these salinity raising factors are continually counterbalanced by processes that decrease salinity such as the continuous input of fresh water from rivers, precipitation of rain and snow, and melting of ice.
All over the globe and from the top of the ocean all the way to the bottom of the ocean, salinity is between ~33-37 ppt or psu (average salinity of the ocean is 35 ppt). The image shown on this page shows salinity measured at the surface of the ocean across the globe. Almost the entire ocean is colored some shade of orange, corresponding to a salinity measurement around 33-36 ppt or psu. The oceans are naturally salty. Life in the oceans has adapted to this salty environment. But, most creatures that live in the ocean could not live in fresh water.