Increase Evaporation from oceans
Yes, you can increase evaporation by spraying the sea water as an aerosol because this increases surface area. It's the same with fresh water too, but why would you want to do it? It wouldn't have any noticeable effect on the humidity of the general area. The only useful effect that I can see concerns fresh water only. Spraying the water from a pond or small lake as fine droplets would increase the oxygen content and benefit the fish. Hot weather depletes the oxygen in the water and sometimes fish become distressed, so if you want to save your valuable coy carp it might be a good idea. In the ocean it doesn't work, the sea is too vast.