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Why can temperature inversion make fog dense?

Answer and explanation

Correct answer: It traps cold moist air near the surface

Direct answer: A is correct. Normally, air near the ground may warm and rise, allowing vertical mixing and dispersing fog. During a temperature inversion, a layer of warmer air lies above colder air near the surface. This arrangement is stable, so the cold air cannot rise easily and the warmer layer acts like a lid. The trapped air may contain enough moisture for condensation into tiny droplets, and weak mixing allows those droplets to remain concentrated; therefore visibility becomes poor and fog becomes dense or persistent. A is correct because it describes both trapping and moisture near the ground. B is impossible because fog droplets are not sent to the Sun. C is wrong because inversion does not remove all moisture; retained moisture helps fog continue. D is wrong because an inversion does not instantly heat the surface. Memory cue: inversion means a warm lid over cold, moist air.

Related tags

Temperature InversionFogAtmospheric StabilityVisibilityForms Of Condensation: DewFrostAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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