An inversion layer near the ground can be caused by…
Refer to figure.
Ground inversions, as the name suggests, form at the ground level. The most common mechanism is the nocturnal (or radiation) inversion, which occurs almost every night over land.
During the night, the Earth's surface cools by radiating heat, which in turn cools the very lowest layers of the atmosphere. This surface layer often becomes colder than the layer just above it, creating an inversion where the temperature initially increases with altitude before resuming the normal pattern of decreasing with altitude.
These inversions are typically only a few thousand feet thick and reach their maximum strength just after sunrise when surface temperatures are at their lowest.
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