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A debate exists over whether tropical troposphere temperature trends inclimate models are inconsistent with observations (Karl et al. 2006, IPCC(2007), Douglass et al 2007, Santer et al 2008). Most recently, Santer et al(2008, herein S08) asserted that the Douglass et al statistical methodology wasflawed and that a correct methodology showed there is no statisticallysignificant difference between the model ensemble mean trend and either RSS orUAH satellite observations. However this result was based on data ending in1999. Using data up to the end of 2007 (as available to S08) or to the end of2008 and applying exactly the same methodology as S08 results in astatistically significant difference between the ensemble mean trend and UAHobservations and approaching statistical significance for the RSS T2 data. Theclaim by S08 to have achieved a "partial resolution" of the discrepancy betweenobservations and the model ensemble mean trend is unwarranted.

An updated comparison of model ensemble and observed temperature trends in the tropical troposphere