As an engineer schooled in the slide rule era, I have been trying to educate myself about the nature of climate models. The details of the specific construction of the models have been hard to find. I am old enough that I have been through the evolution of computers and calculators from those earliest HP scientific models that cost $400 in 1972 dollars. Computers are not electronic brains, they are just very fast electronic slide rules and adding machines. So I want to figure out the thinking process behind the models.
As a summer intern in the thermodynamics department at Grumman Aerospace, I did computer modeling of the air conditioning system of the A-6E aircraft. Getting that program to run took a lot of debugging, but when it finally started to go, it used 2 minutes of computation time on Grumman's biggest computer before the time allotted to a summer intern expired. They needed that computer for other things, such as landing men on the moon! The summer intern's project would have to wait. But I do have an informed curiosity in the creation of these climate models. It's not a pretty picture.
Now that I have found some of the details, I think I can provide a layman's guide to the developing issues about the models. Much of the current debate centers on the validity of the surface temperature issue.
Click source to read FULL report by Bruce Thompson