Whoops! Study shows huge basic errors found in CMIP5 climate models

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I wonder if we should take a closer look at this paper to try to work out if this is cockup or coverup. Are these incorrect zenith angles a fudge to cover some other model deficiency for example?

Incoming solar radiation at the Top of the Atmosphere (TOA)

It was just yesterday that we highlighted this unrealistic claim from CMIP5 models: Laughable modeling study claims: in the middle of ‘the pause’, ‘climate is starting to change faster’. Now it seems that there is a major flaw in how the CMIP5 models treat incoming solar radiation, causing up to 30 Watts per square meter of spurious variations. To give you an idea of just how much of an error that is, the radiative forcing claimed to exist from carbon dioxide increases is said to be about 1.68 watts per square meter, a value about 18 times smaller than the error in the CMIP5 models!

The HockeySchtick writes:

New paper finds large calculation errors of solar radiation at the top of the atmosphere in climate models

A new paper published in Geophysical Research Letters finds astonishingly large…