C. Why does the IPCC exclude Water Vapor in its Analysis?
It is believed that the reason water vapor was excluded was because of the position taken by the IPCC. IPCC specifically said they ignore water vapor as a greenhouse gas contributor contending that water vapor is controlled by temperature which is controlled by CO2.
“The amount of water vapour in the atmosphere is controlled mostly by air temperature, rather than by emissions. For that reason scientists consider it a feedback agent, rather than a forcing to climate change.” IPCC 2013 pg. 666;
“The maximum amount of water vapour in the air is controlled by temperature.” IPCC 2013 pg. 666;
“Currently water vapour has the largest greenhouse effect in the Earth’s atmosphere. However, other greenhouse gases, primarily CO2 are necessary to sustain the presence of water.” IPCC 2013 pg. 667
This analysis is without scientific rigors. If water vapor is a greenhouse gas, it must be considered regardless of what caused it to be present. If water vapor causes all clouds, all snow and glacial ice, the albedo factor inserted into the black body analysis is faulty. If they followed this course because of the reasoning of the IPCC as quoted above, it indicates a serious goal oriented objective or bias.
In addition, their hypothesis that CO2 controls water-vapor by controlling temperature is also faulty. There is strong evidence that CO2 rises AFTER ocean temperatures increase. This is consistent with Henry’s Law. Ocean water at a higher temperature holds less CO2. As the temperature rises, the solubility of CO2 in water goes down and some CO2 is degassed into the atmosphere. Geological history shows that CO2 rises after temperature increases. This was admitted by the IPCC in 2007. This point is set forth in detail in the Discussion Question 6 Item A & B, with data, graphs and scientific references.