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Which condition most commonly favours the formation of a temperature inversion near the ground?

Answer and explanation

Correct answer: A clear, calm night

Correct answer: A. Normally, air temperature decreases with height near the surface. On a clear, calm night, the ground loses heat rapidly through terrestrial radiation because clouds do not return much outgoing energy. The ground then cools the thin layer of air touching it, while air above may remain relatively warmer. Temperature consequently increases with height through this shallow layer, producing an inversion. B is wrong because clouds reduce night-time radiational cooling and strong wind mixes the air. C is wrong because strong daytime heating usually warms the surface and encourages ordinary convection. D is wrong because vigorous convection mixes warm and cool air and breaks a stable inversion. Memory cue: clear sky plus calm air lets the ground cool from below.

Related tags

Temperature InversionClear NightsRadiational CoolingAtmospheric StabilityConvectionDistribution Of Temperature And Inversion Of TemperatureSolar RadiationHeat BalanceAnd TemperatureSolar Radiation Heat Balance And Temperature

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