Melting of ice causes sea surface salinity to decrease, whereas evaporation causes sea surface salinity to increase.
The salinity of the sea surface increases when excess evaporation occurs and the water from the sea is evaporated into the air. In this circumstance, the concentration of the solvent i.e water is decreased and the concentration of the solute i.e salt increases. Hence, evaporation increases sea surface salinity.
On the other, the melting of ice increases the concentration of solvent i.e water in the sea. This increase in the concentration of the solvent causes the sea surface salinity to decrease.
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