Transcription of NIGHT RADIATIVE COOLING - asterism.org
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NIGHT RADIATIVE COOLING - asterism.org
NIGHT RADIATIVE COOLING The effect of clouds and relative humidity Mike Luciuk We ve all experienced that chilly feeling after sunset on a clear calm NIGHT . It seems unusually cold, and, in the winter as well as spring or fall, we might find frost on our windshields. This is usually due to RADIATIVE COOLING . On the other hand, temperature drops on cloudy nights are more temperate. This COOLING effect is illustrated by Figure 1, which shows that RADIATIVE COOLING is the sum of the three sources of radiation: outgoing radiation from objects versus incoming sky and cloud radiation.
Page 3 of 5 We can also determine the radiative clear night sky temperature as follows: ( ) ( ) 276.9 3.90.25 0.25246.6 0.74 5.67 8 P TK εσ xE
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