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So there's more cloud cover when the brighter image was taken? The clouds trap infrared radiation emitted from the ground, and re-emit some of it back toward the ground, making the cloudy infrared image look brighter.
originally posted by: penroc3
I live in upstate NY and I have noticed on different nights my outside cameras at night time are illuminated like it were day time but is pitch black outsaide.
the only thing i can think of is the cloud cover may be bouncing IR light around.
At night clouds trap infrared radiation emitted from the ground, similar to greenhouse gases, and re-emit some of the absorbed radiation back to the ground.
More nighttime cloud cover means more trapped heat, and warmer temperatures near the ground, just as more CO2 in the atmosphere means more trapped heat, and warmer temperatures.
Because clouds are big and thick, their radiation-trapping effect is felt immediately, within a single night.
Because CO2 is diffuse, its effect is felt slowly, over many decades.
Increasing the concentration of CO2 in the atmosphere is like increasing the cloud cover at night: both warm the Earth by trapping infrared radiation.
At night clouds trap infrared radiation emitted from the ground, similar to greenhouse gases, and re-emit some of the absorbed radiation back to the ground.
More nighttime cloud cover means more trapped heat, and warmer temperatures near the ground, just as more CO2 in the atmosphere means more trapped heat, and warmer temperatures.
Because clouds are big and thick, their radiation-trapping effect is felt immediately, within a single night.
Because CO2 is diffuse, its effect is felt slowly, over many decades.
Increasing the concentration of CO2 in the atmosphere is like increasing the cloud cover at night: both warm the Earth by trapping infrared radiation.