23 Aug '11, 6pm

How large were the past changes in the sun?

Of course, these evaluations rely on the models being able to mimic the sensitivity of the real climate system and assume that paleoclimatic reconstructions of the temperature to adequately describe the past climate variations. For the global or hemispheric mean temperatures, either a reduction in sensitivity or an underestimate of past temperature variability could also explain the discrepancy. Using models to distinguish between the forcing histories is thus likely to require a tighter focus on regional changes, or in climate patterns, more than the just the mean temperature.

Full article: http://www.realclimate.org/index.php/archives/2011/08/how...

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