Comparative planetology: Atmospheres.
| Planet | pressure (atm) | H2O | CH4 | CO2 | N2 | O2 |
|---|---|---|---|---|---|---|
| Venus | 90 | 0.00001 | 0.000001 | 0.965 | 0.035 | 0.00002 |
| Earth | 1 | 0 to 0.04 | 0.000001 | 0.000335 | 0.781 | 0.209 |
| Mars | 0.006 | 0.0003 | -- | 0.953 | 0.027 | 0.001 |
Look at all that CO2! What is the magnitude of the greenhouse-derived temperature increase for these three planets?
| Planet | albedo (reflectivity) | Effective radiation temp. with no greenhouse (deg. C) | Actual surface temperature (deg. C) | Greenhouse warming (deg. C) |
|---|---|---|---|---|
| Venus | 0.75 | -39 | 427 | 466 |
| Earth | 0.30 | -18 | 15 | 33 |
| Mars | 0.15 | -56 | -53 | 3 |