Mr. Kyoji Kimoto has asked me to post the following essay, which tells us leading climate sensitivity scientist Dr. Robert Cess admits the IPCC assumptions are erroneous. (Note: Because WordPress didn’t handle some of the scientific notation, I had to cut and paste parts of the text as images).
Dr. Robert D. Cess admits mathematical errors in the AGW theory of the IPCC
by Kyoji Kimoto
Soden & Held  shows climate sensitivity is 3°K for 2xCO2 from the 14 GCM studies for the IPCC 4th Assessment Report (2007) as follows:
Climate sensitivity = no-feedback sensitivity (Planck response) x feedbacks
= 1.2°K x 2.5 = 3°K
Here, feedbacks are water vapor, ice albedo, lapse rate and cloud feedback.
In the AGW theory of the IPCC, the central assumption is that the Planck response is 1.2°K. Cess [2, 3] obtained the Planck feedback parameter lambda0 of -3.3(W/m2)/K utilizing eqn (1), giving the Planck response of 1.2K with the radiative forcing RF of 4W/m2 for 2xCO2 as follows:
Coincidently, the Planck response of 1.2°K by eqn (3) is in very good agreement with the Planck response of 1.2 – 1.3°K obtained with one dimensional radiative convective equilibrium model (1DRCM) studies in the literature [4, 5, 6]. Therefore, the Cess method has been followed by many researchers, including the IPCC 1st Assessment Report (1990) and the 14 GCM studies for the IPCC 4th Assessment Report (2007).
It is the sole theoretical basis of the central assumption of the IPCC that the Planck response is 1.2°K at present time [7, 8, 9], because the 1 DRCM study is fudged due to its strong dependence on lapse rate used according to Hansen’s idea expressed in an interview with Spencer Weart held on 23 October, 2000 at NASA.
On 23 August, 2016, Dr. Robert D. Cess gave me the following answer to my mail, admitting his mathematical errors in the derivation from eqn (1) to eqn (3). Dr. Cess was the leading climate scientist of Intercomparison Project of GCMs for the IPCC Assessment Reports. He wrote:
I will try this one more time, and then I will give up. A lot has happened since M&S (1964) and M&W (1967). In modern usage, the no-feedback sensitivity refers to holding all climate parameters fixed except surface temperature. It addresses the question: What would the sensitivity be if there were no interactive climate feedback mechanisms?. Simply stated, it is a hypothetical reference sensitivity. NO ONE HAS EVER CLAIMED THAT THE NO-FEEDBACK SENSITIVITY IS A TRUE INDICATION OF THE REAL SENSITIVITY.“
The AGW theory of the IPCC is constructed on the Planck response of 1.2°K produced by the mathematically erroneous Cess method. Since Cess has admitted his mathematical errors in the above reply, the theory totally collapses together with the high climate sensitivity of 3°K for a doubling of CO2. It raises sea surface temperature as much as 2°K, thus leading to the various AGW scares such as rapid sea level rise and severer extreme weather in the GCM studies of the IPCC.
Kimoto  showed the surface climate sensitivity of 0.14-0.17°K with the surface radiative forcing of 1.1 W/m2 for 2xCO2. It is reduced from the radiative forcing of 3.7 W/m2 at the tropopause due to infrared absorption overlap between CO2 and water vapor plentifully existing at the surface.
Policy based on false science
There is no need for the restriction of fossil fuel usage from the AGW scares claimed by the IPCC with its mathematically erroneous GCM studies. And ratification of Paris climate deal is harmful to mankind due to its useless CO2 regulations causing huge economic losses to the world.
Fig.1 Energy budget of the earth adapted from R.V. Dorland (2006)
Er: long wave surface radiation Ee: evaporation Et: thermal conduction
Eb: long wave back radiation Eu: long wave upward radiation
Ew: atmospheric window Ea: long wave absorbed by the atmosphere
Es: short wave absorbed by the atmosphere WV: water vapor, CL: cloud
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