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Which situation makes fog particularly persistent?

  • A.A fog forming over a warm surface, from which heat is continuously supplied to the layer of air above it
  • B.A dense fog in winter with a low sun angle
  • C.A shallow fog in summer, when the strong solar heating is able to penetrate to the ground within minutes
  • D.A fog in strong wind

Answer: B

A dense fog reflects much of the incident sunlight, and in winter the available energy is small in any case, so anticyclonic gloom can persist for days. The feedback between fog density and solar penetration makes the situation bistable and hard to forecast. Summer fogs almost always clear within a few hours of sunrise.

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