On the futility of climate models: ‘simplistic nonsense’

Blogging this mainly as a bookmark for future reference. Leo Smith sounds like a brilliant engineer. Note that the post is actually a promoted comment. Mr. Smith’s subsequent comment (1/6/15 at 6:32 pm) is remarkable in its clarity, insight and warning.

Watts Up With That?

Guest essay by Leo Smith – elevated from a comment left on WUWT on January 6, 2015 at 2:11 am (h/t to dbs)

edsel-fine-engineering

As an engineer, my first experience of a computer model taught me nearly all I needed to know about models.

I was tasked with designing a high voltage video amplifier to drive a military heads up display featuring a CRT.

Some people suggested I make use of the acoustic coupler to input my design and optimise it with one of the circuit modelling programs they had devised. The results were encouraging, so I built it. The circuit itself was a dismal failure.

Investigation revealed the reason instantly: the model parametrised parasitic capacitance into a simple single value: the reality of semiconductors is that the capacitance varies with applied voltage – an effect made use of in every radio today as the ‘varicap diode’. for small signals this…

View original post 994 more words

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