mars atmosphere: mass 80% co 2 sfc. temp.: -47 c gh effect: 10 c far too cold! other planets also...
TRANSCRIPT
MarsAtmosphere: mass <1% earth’sGH Gases: >80% CO2
Sfc. Temp.: -47C GH Effect: 10C
FAR TOO COLD!
Other planets also have Greenhouse Effects, but these are unsuitable for life
EarthGH Gases: ~0.04% CO2
~ 1% H2OSfc. Temp.: 15C GH Effect: 33C
NOT BAD!
VenusAtmosphere: mass 90x earth’sGH Gases: >90% CO2
Sfc. Temp.: 477C GH Effect: 523C FAR TOO HOT!
Sun
The “Greenhouse Effect”
• The Earth’s surface thus receives energy from two sources: the sun & the atmosphere – As a result the Earth’s surface is ~33C warmer than it
would be without an atmosphere
Greenhouse gases are transparent to shortwave but absorb longwave radiation – Thus the atmosphere stores energy
Electromagnetic Spectrum
incoming outgoing