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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.
It has roughly 2/3 the salt content of regular seawater. Ocean salinity (expressed in  - per mil) is approximately equal to the weight, in grams, of salts dissolved in 1000g of seawater. This would be the salt concentration in parts-per-thousand (). Average ocean water has a salinity of 35g of dissolved salts.