Climate sensitivity 0.6 degrees calculated by three different methods

Climate sensitivity studies have been very popular subjects in the recent climate change science literature. Climate sensitivity (CS) means the temperature increase corresponding the doubling of CO2 concentration 280 ppm. A common feature in this research papers is that the climate sensitivity values are smaller than those of IPCC. In some cases the difference is a very big one like 0.6 degrees versus 1.75 degrees manifested by IPCC for transient climate sensitivity and 3.0 degrees for equilibrium CS.. The author has carried out his own CS calculation applying three different methods: The energy balance of the Earth, the specification of CS utilizing the spectral analysis method, and the ab

What is the real radiative forcing value of CO2?

IPCC has used as radiative forcing value for carbon dioxide (CO2) the equation introduced by Myhre et al. in 1998 even in its latest report AR5. The formula of this equation is: (1) RF = 5.35*ln(C/280) Where RF is radiative forcing in W/m2, and C is the CO2 concentration in ppm. Myhre et al. (1998) informs that “only the direct forcing to a change in WMGG (well mixed greenhouse gases) concentration is considered here” in calculating RF values. There are two other studies referred in AR4. The RF values of 560 ppm CO2 concentrations in these three studies are: Myhre et. al. (1998) 3.71 W/m^2, Hansen et al. (1998) 3.63 W/m^2, and Shi (1992) 3.98 W/m^2. IPCC has regarded these three simpl

The hottest year 2014 debate

There has been a keen conversation whether the year 2014 was the hottest year since 2010 or not. Many objectors have pointed out that the difference between these years is only in maximum 0.04 degrees. This is less than the measurement accuracy of temperature measurement. In the climate change science it has become a habit that the final results are reported with higher accuracy than the measurements themselves. During my university studies, if a student reported in his physical laboratory exercises final results having higher accuracies than the measurements, the report has to be corrected before final acceptance. For example, IPCC reports that the temperature increase in 2011 has been 0.85

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