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Three factors are evaporation and freezing of sea water.
evaporation
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In open ocean evaporation affects the salinity of the oceans, in closed oceans the lack of sunrays cause greater salinity levels.
Temperature, salinity, and pressure.
Temperature is another significant factor that affects the density of seawater. As temperature decreases, seawater becomes denser and sinks, while warmer seawater is less dense and rises. The interactions between salinity and temperature play a crucial role in driving ocean currents and circulation patterns.
Fishing is a factor that affects aquatic life in the ocean. So is water pollution.
There are different kinds of process that deeply affects the salinity of ocean water. Continental deflections, Coriolis Effect, convection current and also evaporation.
Oceans are big water bodies. Salinity is due to the presence of minerals in water.
Salinity is defined as the total amount of solid material in grams contained in 1km of sea water and is expressed as part per thousand. Salinity affects physical property of ocean such as temperature, pressure, density, waves and currents.
Salinity in oceans decrease when near a river because the river adds fresh water, which lowers the percentage of salt in the water, causing the salinity to decrease.
Density of seawater is largely a function of two factors: depth, that is, the deeper water is more dense than water at shallower levels; and temperature - water at higher temperatures is less dense than cooler water. Salinity is also a factor, but that's a localized phenomena simply because all the worlds oceans are in fact one large ocean and maintains an average overall salinity.