Not too sure about the difference. The water level would just drop, and the water simply flow away from the shallow coastal areas. I don't know what would salin

Not too sure about the difference. The water level would just drop, and the water simply flow away from the shallow coastal areas. I don't know what would salinity the water would have reached after dropping 200 meters but it's not the one you get if you simply let a volume of water to evaporate completely, which would be 100%.