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How can humidity increase at coastal areas during night?

Answer and explanation

Correct answer: Falling night temperature can bring air closer to saturation

Direct answer: A is correct. Coastal air commonly has access to moisture because evaporation occurs from the nearby sea and other wet surfaces. During night, the land and the air near it often cool. Cooling does not necessarily remove the actual water vapour immediately, but it lowers the amount of vapour that the air can hold at saturation. Consequently, the existing vapour becomes a larger percentage of the reduced capacity, so relative humidity rises. If cooling continues to the dew point, condensation may begin and dew, fog, or low cloud can form, depending on conditions. A is correct because it identifies the essential night-time process: cooling brings air nearer to saturation. B is absurd because the sea remains present at night. C is wrong because evaporation can still occur, although its rate may change. D is wrong because air continues to contain gases and water vapour. Memory cue: coastal moisture plus night cooling usually raises relative humidity.

Related tags

Coastal HumidityNight CoolingRelative HumidityHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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