Post on 20-Dec-2015
Atmospheric Chemistry
Global Warming
Gas Mole PercentN2 78.08O2 20.95Ar 0.934CO2 0.03O3 1.0 x 10-7
Composition of Atmosphere:
CO2 Levels
Eout = T4
= 5.67 x 10-8 W/m2K4
= AlbedoEarth = 0.28Mars = 0.17Jupiter = 0.73Venus = 0.71
Es = solar energy inputEarth = 1380 W/m2
Mars = 600Venus = 2600If Ein = Eout, then
Global Energy Balance:
(1 )4s
in
EE
4(1 )4sE T
4(1 )
4s
calc
ET
= 5.67 x 10-8 W/m2K4
= AlbedoEarth = 0.28Mars = 0.17Jupiter = 0.73Venus = 0.71
Es = solar energy inputEarth = 1380 W/m2
Mars = 600Venus = 2600
Try for Earth: Calculate average temperature of Earth
Of Venus?
Greenhouse Effect:
some energy radiated back to space is captured and re-radiated back to Earth.
f = IR transmission factor
So: Eout = fT4
4(1 )4sE f T
= 5.67 x 10-8 W/m2K4
= AlbedoEarth = 0.28Mars = 0.17Jupiter = 0.73Venus = 0.71
Es = solar energy inputEarth = 1380 W/m2
Mars = 600Venus = 2600
Calculate IR transmission factor for Earth: Tactual = 291 K
Calculate IR transmission factor for Venus: Tactual = 750 K