Discussion
Which of the following would NOT be expected on a clear calm night?
Answer: D
Correct answer: Looping plume behaviour
Looping would not be expected on a clear calm night. It requires strongly unstable, superadiabatic conditions produced by solar heating of the ground, so it is a daytime form.
The other three are exactly what a clear calm night produces. The ground radiates heat to the cloudless sky and cools, forming a radiation inversion; that inversion caps the layer and gives a low mixing height; and the strong stability suppresses vertical spread, so a plume takes the thin flat form of fanning.
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