Discussion
An inversion is a layer in which temperature
Answer: C
Correct answer: Increases with height
An inversion is a layer in which temperature increases with height, inverting the normal decrease. Because the air aloft is warmer and therefore lighter, a parcel rising from below arrives colder and denser than its surroundings and sinks back, so vertical motion is strongly suppressed.
That suppression is why inversions matter for air quality: pollutants released beneath one are confined to a shallow layer and accumulate. Temperature constant with height is an isothermal layer, and a decrease with height at the adiabatic rate is the neutral case - neither is an inversion.
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