ESS220
Prof. Jin-Yi Yu
Energy Emitted
from Earth
§ The
Stefan-Boltzmann Law
The
energy flux emitted by a blackbody
is related to the fourth power of the
body’s
absolute temperature
F = sT4 where
s is 5.67x10-8 W/m2/K4
§ Energy
emitted from the Earth
=
(blackbody emission) x (total area of Earth)
= (sTe4 ) x (4p R2Earth )
(from
The Earth System)
absolute temperature