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Why can a cloudless cold night help frost formation?

Answer and explanation

Correct answer: The surface can fall below freezing because of stronger radiational cooling

Correct answer: A. At night, the ground loses energy by emitting terrestrial radiation. Clouds can absorb and re-emit some of this outgoing energy, but a clear sky allows more net heat loss from the surface. During a cold, calm night, the surface temperature may fall to or below 0°C. If moisture is present, water vapour can change directly into solid ice crystals on cold surfaces; this is deposition and produces frost. B is opposite to the cooling process. C is wrong because moisture is needed for frost and does not simply vanish. D is wrong because air remains present even when the sky is clear. Memory cue: clear sky plus cold surface favours frost, provided moisture is available.

Related tags

FrostClear SkyRadiational CoolingDepositionForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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