- I have no doubt that these fellows did their level best to calibrate their models and get an accurate projection. What I’m not sure you understand yet is that calibration itself is where bias and opinion are introduced into model results. When they increase the sensitivity parameters related to greenhouse gases in order to get predictions that match the results, they have functionally built an ASSUMPTION into the model that greenhouse gasses ARE the primary driver of temperature increases. If this IS the blunder they made and there are actually other mechanisms not fully identified that contributed to the temperature rise, then by the principle of error analysis one would expect that when the calibrated model is used to project the effects of FURTHER increases in greenhouse gases that these effects would be OVER-predicted if the actual drivers not identified in the model did not change (whew, what a mouthful!). The fact that this is PRECISELY what has happened (models are significantly over-predicting temperature rises in the last decade), suggests that their calibration isn’t good yet.
As I stated I know full well, bec I have queried climate scientists about this – they are NOT including longer term positive feedbacks of huge gigatons worth of carbon release from melting hydrates and permafrost, so they are GROSSLY underestimating the problem. And you are right, they seem to have a tendency to think their models are reality. Comes with the territory.
They indeed do include ALL the known factors into their models … to the extent they are able, given computer power, and whether the factors are quantifiable with functions (they admit there are other factors that do not meet these specs). They run the models without the GHGs, and find they do not match up at all with actual data; in other words, only when they add in the GHGs and their impact (which has been long accepted in science for over 100 years, and now with paleoclimatological proof going back millions of years and from Venus and Mars, as well) are they able to closely match their models with actual data. You might want to contact these scientists and find out more. I’ve found them to be very forth-coming, as long as they think someone is trying to find out the truth and not merely attack them.
The reason computer models are important is because we do not have 2 earths on which to run this experiement – one with extra GHGs added, and one without extra GHGs added. In fact such an experiment would never pass IRB. What we are conducting is a natural experiment, and we have to do the best we can outside of the laboratory.
RE climate sensitivity – that is not merely determined by computer models, but also paleoclimatology, which has set certain possible boundaries of what sensitivity can be. Of course time will be the ultimate determinant of what the actual sensitivity is. I understand it is a log function, which for all intents and purposes is being treated as a linear function for the next 100 or so years – but the idea is if GHGs were to jump way way up, the impact would not be as great as these initial phases of them increasing. OTOH, at that point of tremendous GHGs AND solar irradiance having increased over the past millions of years, we’d probably all be dead by that time anyway – so no one to tell us the extact sensitivity at such&such a really high GHG level. I wonder if anyone is still alive on Venus doing climate science there?
On a final note, climate science is NOT restricted to computer models, but includes a wide array of many different studies…and they all dovetail into “AGW is real” and is happening…
- Few to no serious research scientists have permanent jobs in endowed institutions. The vast majority of them will starve unless they produce study results sexy enough to allow them to sell their NEXT research grant request. This increasingly makes the science business like the journalism business: If you don’t make headline news, you don’t keep the revenue flowing. Attention and money flow to those who make the biggest splash. Findings of “Studies are Inconclusive and More Research is Needed” stop selling papers and grant requests very quickly.
Many climate scientists came from related fields (or had the option of going into non-controversial fields) and would have been quite happy to remain there, obscure in some lab or field doing their work without being viciously attacked. It is true brilliant scientists have been flowing into climate science because it is a very important field and a highly complex one (we’re talking about nearly all of earth systems).
It is good, decent, and very courageous of them to risk their lives and their children’s lives to do climate science. I don’t think any whacko denialist has actually killed any climate scientist yet, but they have lobbed death threats at them and their families, and I think it is just a matter of time before a climate scientist or his/her family member get assassinated.
Climate scientists are true heroes. I applaud them for not being bought out or intimidated by the denialist industry.
We should all have the courage to stand up for truth and justice.