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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.
Ocean salinity is measured in grams of salt per kilogram of sea water. The range which is measured is currently only between 32 and 37 parts per thousand, but NASA hopes to get this down to 0.2 parts per thousand, a change of just one millilitre of salt in six litres of water.