Positive water feedback not found in the Mt. Pinatubo eruption

Excellent discussion of [CO2], RH, and feedbacks. Lively discussion in the comments. Nick Stokes, George Smith, and Pamela Grey join the article’s author in debate on climate models and assumptions regarding RH: Is it constant or not? Good reading.

Watts Up With That?

Guest essay by Dr. Antero Ollila

Water vapor feedback has remained a topic of debate since 1990. The laymen do not know that water has an essential role in calculating the warming effects of GH gases. In all Anthropogenic Global Warming (AGW) models the Relative Humidity (RH) stays constant. It sounds like a very neutral and harmless assumption. When GH gases increase the atmospheric temperature, the constant RH means that the absolute amount of atmospheric water also increases. Because water is about a 15 times stronger GH gas than carbon dioxide, this small increase of water content increases the temperature as much as GH gases. According to IPCC, the radiative forcing of GH gases is doubled by water (AR3 and AR4). IPCC calls this feature a positive feedback of water.

According to my spectral analysis calculations, the positive water feedback effect would be this magnitude. But in AR5 (20139 IPCC…

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