THE EVOLUTION OF MICROSTRUCTURE OF MORNING FOGS

N. P. Romanov

The results of experimental investigations of the microstructure of fog resulted from dew evaporation at sunrise, during its origin, development, and dissipation are presented. A narrow drop spectrum was initially observed with a gradual increase in the efficient radius of particles. At the following stages its value was stabilized within the range of 10-15 µm. Significant fluctuations of drop concentration (from 40 to 150 cm-3) were recorded. A process of fog dissipation consisted in a rapid decrease in drop concentration with the retention of their efficient radius. An additional analysis of two other radiation fogs (evening and morning) allows the conclusion that a similar pattern is typical for most of the radiation fogs. The analysis of meteorological situation supported the conclusion that a competition between moisture sink onto an underlying surface at its cooling and the water vapor supersaturation at air cooling is of far reaching importance for the formation of radiation fog.

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