  Increasing marine haze and clouds has been considered as a possible means of
increasing the Earth's albedo. This would reduce Solar heating and global
warming, counteracting the effects of the anthropogenic increase in greenhouse
gases. One proposed method of doing so would inject small droplets of seawater
or condensation nuclei into the marine boundary layer, creating artificial haze
and cloud. The equilibrium size of such droplets is described by the K\"{o}hler
equation that includes the vapor pressure reduction attributable to the solute
according to Raoult's law and the vapor pressure increase of a small droplet as
a result of surface tension according to Kelvin. Here we apply this classic
result to small droplets in the marine boundary layer, where the partial
pressure of water vapor is less than the equilibrium vapor pressure because it
is in equilibrium with the saline ocean. We calculate the equilibrium size of a
droplet containing dissolved ions and find that the radius of a droplet of
seawater shrinks greatly before it achieves equilibrium.
