JBeukema
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[FONT=arial, helvetica, sans serif]Current global temperature anomalies (the amount of warming or cooling reported) are estimated against an expected average of 14 °C (287 K, 57 °F) -- the guess-timated mean temperature over the period 1961-1990.[/FONT]
[FONT=arial, helvetica, sans serif] [FONT=arial, helvetica, sans serif] [/FONT][FONT=arial, helvetica, sans serif]One of the quirks of climate science is that climate models are frequently 'tuned' to reproduce the expected mean temperature of 287 K or 14 °C and, somewhat bizarrely, 14 °C is thought to be the correct figure because 'the most trusted models produce it'. While the average of model representations of global climate suggests Earth's mean temperature is about 14 °C (287 K), the 16 most trusted and 'stable' models tested in the Coupled Model Intercomparison Project (CMIP) (see original .pdf) are not well able to reproduce this result.[/FONT]
[FONT=arial, helvetica, sans serif]This graphic represents the unforced control runs for the "ensemble" (IPCC-speak for "haven't got a clue if any of these actually represent reality -- throw 'em all together and say the errors average out"). The range starts out guessing mean Earth surface temperature as anything from 11.5 to 16.5 °C (roughly 285-290 K) and ends -- without messing with carbon dioxide levels or anything else -- with the guesses even further apart.[/FONT]
[FONT=arial, helvetica, sans serif]The absolute mean surface air temperature of the Earth is actually not known and there is no specification of exactly what we are trying to measure or how to go about doing so. No one knows what Earth's optimal temperature would be or how it could be knowingly and predictably adjusted even if an optimum could be agreed.[/FONT]
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