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Which atmospheric process is most directly responsible for the greenhouse effect?

Answer and explanation

Correct answer: Absorption and re-emission of long-wave radiation by greenhouse gases

Correct answer: A. The Sun sends mainly short-wave radiation to Earth. The surface absorbs part of this energy and later releases energy upward as long-wave terrestrial radiation. Greenhouse gases, including water vapour, carbon dioxide, and methane, absorb some of this outgoing long-wave radiation and re-emit energy in different directions. A portion is directed back toward the surface, reducing the rate at which heat escapes and warming the lower atmosphere and surface. B is wrong because clouds do not absorb all solar radiation, and that is not the defining greenhouse mechanism. C is wrong because the process concerns outgoing long-wave radiation, not complete reflection of ultraviolet radiation. D is unrelated and does not occur as a normal atmospheric process. Memory cue: short-wave enters; long-wave is partly held and re-emitted.

Related tags

Greenhouse EffectLong-Wave RadiationHeat BalanceGreenhouse GasesAtmosphereHeating And Cooling Of The AtmosphereSolar RadiationAnd TemperatureSolar Radiation Heat Balance And Temperature

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