Which type of inversion occurs when cold air is trapped below warmer air during the night?

The correct answer highlights the phenomenon known as a radiation inversion. This type of inversion typically occurs during clear nights when the ground loses heat rapidly through radiation. As the surface cools, it cools down the air directly above it, creating a layer of colder air at the surface with warmer air above it. This results in a temperature gradient where cold air is trapped beneath the warmer air layer.

Radiation inversions are common in stable atmospheric conditions, especially in valleys and low-lying areas. They can lead to the formation of fog and low clouds due to the increased humidity near the surface as the cold air can hold less moisture than warm air.

Understanding this concept is critical for pilots, as these inversions can create challenging flight conditions such as reduced visibility and can affect aircraft performance due to the cold, dense air near the ground.