Water Vapor is by far the most significant Green House Gas (GHG)

ghgabsoprtionspectrum

The only defined mechanism by which CO2 can affect climate change is by affecting outgoing radiation between the wavelengths of 13 and 18 microns.

  1. Incoming visible radiation has a wavelength between 0.4 and 0.7 microns, and is consistent with a black body of temperature of around 5,200 degree C (the Sun). CO2 is transparent to these wavelengths.
  2. The earth emits IR mostly between 6.5 and 12.5 microns, with a peak near 9.5 microns. 9.5 microns is consistent with a black body of temperature  18 degrees Celsius. CO2 is mostly transparent to those wavelengths.
  3. CO2’s absorbs between 13 and 18 microns, with a peak near 15 microns. Those wavelengths are consistent with a black body of temperature -80 degrees Celsius.
  4. H2O is by far the most significant GHG, and absorbs across the IR Spectrum.
  5. CO2 absorbs a small fraction of the IR Spectrum having 3 narrow peaks at 2.7, 4.3 and 15 microns, all of which largely miss the peak outgoing  IR radiance of the earth at 9.5 microns.
  6. H2O largely absorbs the same IR spectrum as CO2, and is at much higher concentrations in the atmosphere. H2O IR absorption makes CO2 contribution to warming inconsequential.

2 Comments on “Water Vapor is by far the most significant Green House Gas (GHG)

  1. The are no greenhouse gases because there is no greenhouse effect.

    Point One:
    The notion that the earth’s surface is 33 C warmer with a “greenhouse” atmosphere is rubbish.
    The 15 C aka 288 K is a wild ass guesstimate for only the land area’s surface temperature. (IPCC AR5 Glossary)
    The -18 C aka 255 K is an unrelated-to-the-surface & with-atmosphere theoretical “what if?” S-B BB equilibrium temperature calculated from the globally averaged 240 W/m^2 OLR at ToA (100 km).
    The lunar papers by Volokin and Kramm clearly confirm that the earth without an atmosphere and 30% albedo will be hotter not cooler.

    Point Two:
    A fanciful up/down/”back” GHG radiation energy loop attempts to explain a physical mechanism behind this erroneous 33 C warmer premise, an explanation involving copious amounts of QED handwavium.
    This loop violates thermodynamics by 1) creating energy out of nowhere, 2) moving energy from cold to hot without additional work, 3) moving energy in a perpetual 100% efficient loop.
    The upwelling radiation is not a physical fact, but a theoretical “what if?” S-B ideal BB calculation.
    The allegedly “measured” up/down welling radiation is an illusion due to IR instruments not properly corrected for the actual emissivity. (Think of VW et. al. “tweaking” emissions tests.)

    Point Three:
    No GHG energy loop = No RGHE = No human/CO2 role in climate behavior, sea levels, ocean pH, sea ice & caps, polar bears, etc.

    Liked by 2 people

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