Which of the following processes would decrease the amount of salinity in seawater?
evaporation
global temperature increase
formation of sea ice icebergs melting

Evaporation.

Explanation:

Evaporation does not decrease the salinity in the water, on the contrary, it increases salinity.

Seawater constantly moves between liquid and gas states, through the water cycle, when sea water evaporates, only pure water returns to the atmosphere. The salt particles are left behind, and the salinity levels in the sea increase. The leftover salt particles can also remain floating in the air, is that why people living near the sea, can smell the salt from distance.