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CH3041
THE GASES
• If no H2O or CO2
in the troposphere
then the Earths surface
T would be -18oC.
• H2O  100 W m-2 (absorbs)
  CO2    50 W m-2
• Doubling [CO2] will
incr. absorbn by 4 W m-2
• CFCs and HFCs absorb in the window that CO2 & H2O don’t absorb in: 8 - 12 mm. Methane, O3 and N2O absorb in the same region.
CO2
H2O
CFC
HCFC
O3
CH4
N2O