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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.
Here is a map showing the salinity of the surface waters of the ocean, down to a water depth of 50 meters, in parts of dissolved salt per 1000 (o/oo) parts of sea water.ere is a map showing the salinity of the surface waters of the ocean, down to a water depth of 50 meters, in parts of dissolved salt per 1000 (o/oo) parts of sea water.