Discussion
Consider the following pairs of plume type and the profile that produces it:
Lofting - Stable below, unstable above
Fumigation - Inversion eroding from below
Trapping - Stable layers both above and below
Coning - Strongly unstable throughout
How many of the pairs given above are correctly matched?
Answer: D
Correct answer: Only three
Three pairs are right: lofting with stable air below and unstable above; fumigation with an inversion eroding from below; trapping with stable layers both above and below. The fourth is wrong: coning occurs in neutral conditions, with moderate turbulence roughly equal in the vertical and crosswind directions. Strongly unstable air gives looping instead.
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