“Figure 5: Spectrum of the greenhouse radiation measured at the surface. Greenhouse effect from water vapor is filtered out, showing the contributions of other greenhouse gases (Evans 2006).” – from SkS
This is one of the fingerprints of global warming according to some. The above is IR returning to earth. Most of it from CO2 and methane is also significant. In a discussion of this being a fingerprint it occurred to me that water vapor would also be a very good fingerprint. Incredibly strong evidence of the expected increase in water vapor.
Figure 4: Change in spectrum from 1970 to 1996 due to trace gases. ‘Brightness temperature’ indicates the equivalent blackbody temperature (Harries 2001). – from SkS
Water vapor is missing from the above.
brandonrgates points out my mistakes here: