A core tenant of the Theory of AGW states that temperature increase by 1.5C for ever doubling of CO2 from 280 PPM. Let's say that could be true, why don't we test this by comparing a 250PPM CO2 environment to a 1,000PPN CO2 environment. According to the American CO2 is bad Theory of Manmade Global Warming, the latter should be 3C warmer than the former. Correct?
Well, it might not be, because you see "3C is the Equilibrium Climate Sensitivity, Frank, not the Transient Climate Response" [SAYS POSTER CRICK]
Which sounds to be like an excuse for CO2 laboratory performance anxiety. What he means to say is that, "Sure there is no temperature increase in the lab, but our models show a 3C increase based upon Transient Climate Response, you Denier!"
Can someone please explain why doubling is not really doubling?
You quoted me there without attribution Frank. And then you do a really shitty job of telling everyone that I meant to say something else. Well: "Can someone please explain why doubling is not really doubling?" which sounds to me like a confession of sexual proclivities that can't be mentioned here per USMB rules. What I think he meant to say, though, was "Poster CrusaderFrank is a stunningly ignorant and thoughtless dweeb."
From the glossary of The Physical Science Basis
Climate sensitivity The change in the surface temperature in response to a change in the atmospheric carbon dioxide (CO2) concentration or other radiative forcing. See also Climate feedback parameter.
Earth system sensitivity The equilibrium surface temperature response of the coupled atmosphere–ocean–cryosphere–vegetation–carbon cycle system to a doubling of the atmospheric carbon dioxide (CO2) concentration is referred to as Earth system sensitivity. Because it allows ice sheets to adjust to the external perturbation, it may differ substantially from the equilibrium climate sensitivity derived from coupled atmosphere– ocean models.
Effective equilibrium climate sensitivity An estimate of the surface temperature response to a doubling of the atmospheric carbon dioxide (CO2) concentration that is evaluated from model output or observations for evolving non-equilibrium conditions. It is a measure of the strengths of the climate feedbacks at a particular time and may vary with forcing history and climate state, and therefore may differ from equilibrium climate sensitivity.
Equilibrium climate sensitivity (ECS) The equilibrium (steady state) change in the surface temperature following a doubling of the atmospheric carbon dioxide (CO2) concentration from pre-industrial conditions.
Transient climate response (TCR) The surface temperature response for the hypothetical scenario in which atmospheric carbon dioxide (CO2) increases at 1% yr–1 from pre-industrial to the time of a doubling of atmospheric CO2 concentration (year 70).
Transient climate response to cumulative CO2 emissions (TCRE) The transient surface temperature change per unit cumulative carbon dioxide (CO2) emissions, usually 1000 GtC. TCRE combines both information on the airborne fraction of cumulative CO2 emissions (the fraction of the total CO2 emitted that remains in the atmosphere, which is determined by carbon cycle processes) and on the transient climate response (TCR).
Climate services Climate services involve the provision of climate information in such a way as to assist decision-making. The service includes appropriate engagement from users and providers, is based on scientifically credible information and expertise, has an effective access mechanism and responds to user needs (Hewitt et al., 2012)