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What is the main reason for the vertical decrease of water vapour in air?

Answer and explanation

Correct answer: Sources are near the surface and temperature is lower aloft

Correct answer: A. Most atmospheric water vapour enters the atmosphere at or near Earth’s surface through evaporation from oceans, lakes, rivers, soil, and wet vegetation, together with plant transpiration. As air rises, temperature generally decreases through the lower atmosphere. Colder air has a lower capacity to hold water vapour, so some vapour condenses into cloud droplets or ice crystals and may later return as precipitation. In addition, the main moisture sources are concentrated near the surface, so less vapour is normally found at greater heights. B is wrong because oceans are not more common aloft. C reverses the distribution of moisture sources. D is scientifically false; atmospheric water vapour mainly comes from surface water and biological processes, not from outer space. Memory cue: near-surface sources plus colder upper air explain the vertical moisture decrease.

Related tags

Vertical DistributionWater VapourUpper AirTemperatureHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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