Abstract
With the development of radiation fog, the radiative cooling rate increases greatly and temperature decreases rapidly just below the fog top. This effect accelerates the condensation of water vapor near the fog top and, consequently, increases the height and liquid water content of the fog. The sudden increase of downward radiative flux from the fog layer enhances the rise of surface temperature, and the temperature profile in the fog layer turns from stable into unstable. With the increase of instability of temperature stratification in the fog layer, eddy diffusivities also increase rapidly.