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What is the most correct role of clear sky in dew formation?

Answer and explanation

Correct answer: It increases radiational heat loss from the ground

Correct answer: A. After sunset, the ground loses energy by emitting long-wave radiation. A clear sky generally allows more effective radiational cooling of the surface because there are fewer clouds to absorb and re-radiate some of that outgoing energy. As the ground cools, the air immediately touching it also cools. If this air reaches its dew point, water vapour condenses on the surface and dew forms, provided the surface is not below freezing. B is impossible because sunlight is absent at night. C is wrong because clear sky does not remove water vapour; moisture is still needed. D is wrong because clear conditions do not always create turbulence. Memory cue: clear night lets the ground “radiate away” heat, helping it reach the dew point.

Related tags

DewClear SkyRadiational CoolingDew PointForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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