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Overnight temperatures are warmer when the air is humid because: water vapor is a good absorber of incoming shortwave radiation, causing more energy to be stored during the day. water vapor is good at scattering longwave radiation. water vapor is a good absorber of outgoing longwave radiation. water vapor and clouds cause the earth system to have a higher nighttime albedo

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Mfonseca150
I think: water vapor is a good absorber of outgoing longwave radiation. 

Answer:

The answer is "water vapor is a good absorber of outgoing long-wave radiation"

Explanation:

The humidity present in the nights is defined by the dew point, where the surface temperature can reach the dew point. As the dew point increases, the amount of water vapor in the air increases. Thus, we can say that water vapor acts as a greenhouse gas. The greater the amount of water vapor, the greater the amount of long-wave radiation maintained in the troposphere. On the other hand, the smaller the amount of water vapor in the air, the more easily long-wave radiation is allowed by the Earth's surface to escape into space.

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