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What is the usual explanation for (RH) decreasing by day and increasing at night over land?

Answer and explanation

Correct answer: Temperature rises by day and falls at night

Correct answer: A. Relative humidity depends on both the amount of water vapour actually present and the air’s saturation capacity. During the day, solar heating raises air temperature. Warm air can hold more water vapour before becoming saturated, so if the actual vapour amount does not increase in the same proportion, relative humidity falls. At night, the land surface and nearby air cool. Cooler air has a lower saturation capacity, so the same or nearly similar amount of vapour represents a higher percentage of saturation; relative humidity therefore rises. B is too absolute because vapour does not simply disappear during the day. C is false because nighttime air can retain moisture. D is false because saturation capacity changes with temperature. Memory cue: warmer air usually lowers RH; cooler air usually raises RH when moisture content is broadly unchanged.

Related tags

Diurnal HumidityTemperatureRelative HumiditySaturationHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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