Discussion
Statement I: An inversion suppresses vertical mixing.
Statement II: Within an inversion a rising parcel finds itself colder and denser than its surroundings.
In the light of the above statements, choose the correct answer.
Answer: C
Correct answer: Both Statement I and Statement II are correct
Both statements are correct, and the second is the mechanism behind the first. Within an inversion the air above is warmer than the air below, so a parcel rising from below - cooling as it goes at the adiabatic rate - arrives colder and denser than its surroundings and is pushed back down.
That restoring force is exactly what suppresses vertical mixing. Pollutants released beneath an inversion are therefore confined to a shallow layer and accumulate, which is why inversions are the meteorological condition most associated with pollution episodes.
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