Why is there foggy, sunny and dry weather in the inversion layer?

Inverse temperature, that is, the temperature is high and the near-surface temperature is low.

Then, in the vertical direction, the airflow is dominated by downward movement. The weather is sunny and dry.

Fog is a water vapor condensate composed of small water droplets or ice crystals floating in the air, which is produced in the near-surface layer of the atmosphere.

Since fog is water vapor condensation, we should look for its reason from the conditions that cause water vapor condensation. There are two reasons for water vapor saturation in the atmosphere: first, evaporation increases water vapor in the atmosphere; The other is the cooling of the air itself. Cooling is more important for fog. When there are condensation nuclei in the air, if water vapor continues to increase or melt, condensation will occur in saturated air. Fog is formed when condensed water drops reduce the horizontal visibility to less than 1 km.

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