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Lofting occurs when the atmosphere is

  • A.Unstable throughout
  • B.Stable below, unstable above
  • C.Unstable below and stable above
  • D.Stable throughout

Answer: B

Correct answer: Stable below, unstable above

Lofting is the most favourable of the classical plume types. The stable layer beneath the plume blocks any downward mixing, so almost nothing reaches the ground, while the unstable air above disperses the plume upward freely. It typically occurs in the early evening, as the surface cools and an inversion forms below a still-unstable layer aloft.

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