Guest Opinion: Dr. Tim Ball
In his recent article on WUWT titled “HADCRU Power and Temperature” Andy May refers to the challenges of modelling the atmosphere. He wrote,
The greenhouse effect (GHE), when calculated this way, shows an imbalance of 390-239=151 W/m2. Kiehl and Trenberth, 1997 calculated a similar overall forcing of 155 W/m2 using the same procedure. This GHE calculation makes a lot of assumptions, not the least of which is assuming the Earth has an emissivity of 1 and is a blackbody. But, here we want to consider the problem of using a global average temperature (T) for the Earth, which is a rotating sphere, with only one-half of the sphere facing the Sun at any one time.
Models vary from hardware models or simple scaled down versions of reality to complete abstractions. A model car is an example of the former and…
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