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New Study Increases Concerns About Climate Model Reliability

ScienceDaily – December 12, 2007

If you read this site on a regular basis, this will be no surprise to you. A couple fairly prominent and outspoken scientists are trying to explain that the computer models that are used for predicting the massive problems of the future are not quite as accurate and foretelling as some will have you believe.

Many people will say that the climate projections are good enough and we should go into massive retooling of the worlds economy based on this small amount of information. This is the common theme over at RealClimate. While the jury is still out, in my opinion, as to what the future holds for us, there is no question that we do not have very good evidence on either side of the issue. The current models make numerous assumptions and any errors in the logic will tend to exaggerate over time.

I have written on this subject many times in the past.  Click through here to read some of my other comments.

A new study comparing the composite output of 22 leading global climate models with actual climate data finds that the models do an unsatisfactory job of mimicking climate change in key portions of the atmosphere.


“The usual discussion is whether the climate model forecasts of Earth’s climate 100 years or so into the future are realistic,” said the lead author, Dr. David H. Douglass from the University of Rochester. “Here we have something more fundamental: Can the models accurately explain the climate from the recent past? “It seems that the answer is no.”


“When we look at actual climate data, however, we do not see accelerated warming in the tropical troposphere. Instead, the lower and middle atmosphere are warming the same or less than the surface. For those layers of the atmosphere, the warming trend we see in the tropics is typically less than half of what the models forecast.”

Read the rest of the report here.

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