Everything about Radiative Cooling totally explained
Radiative cooling is the condition in which a body loses more energy by
radiation than it gains from its surroundings.
Meteorological effects
The large-scale circulation of the
Earth's atmosphere is driven by the difference in absorbed solar radiation per square meter, as the sun heats the Earth more in the
Tropics, mostly because of geometrical factors. The atmospheric and oceanic circulation redistributes some of this energy as
sensible heat and
latent heat partly via the mean flow and partly via eddies, known as
cyclones in the atmosphere. Thus the tropics radiate less to space than they'd if there were no circulation, and the poles radiate more; however in absolute terms the tropics radiate more energy to space.
Personally experiencing radiative cooling
Radiative cooling is commonly experienced on cloudless nights, when heat is radiated into space from the surface of the Earth, or from the skin of a human observer. The effect is well-known among
amateur astronomers, and can personally be felt on the skin of an observer on a cloudless night. To feel the effect, one compares the difference between looking straight up into a cloudless night sky for several seconds, to that of placing a sheet of paper between one's face and the sky. Since outer space radiates at about a temperature of 3
kelvins (-270
degrees Celsius or -450
degrees Fahrenheit), and the sheet of paper radiates at about 300 kelvins (room temperature), the sheet of paper radiates more
heat to one's face than does the darkened cosmos. The effect is blunted somewhat by Earth's surrounding atmosphere which also traps heat. Note that it's
not correct to say that the sheet "blocks the cold" of the night sky; instead, the sheet is literally warming your face, just like a camp fire warms your face; the only difference is that a campfire is several hundred degrees warmer than a sheet of paper, just like a sheet of paper is several hundred degrees warmer than the deep night sky.
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