Posted by Curt on 16 July, 2012 at 2:01 pm. 5 comments already!


A recent paper presented at the European Geosciences Union meeting finds global warming over past century was only about one-half [0.42°C] of that claimed by the IPCC [0.7-0.8°C]. The paper finds that in 2/3 (67%) of the weather stations examined, questionable adjustments were made to raw data that resulted in “increased positive trends, decreased negative trends, or changed negative trends to positive,” whereas “the expected proportions would be 1/2 (50%).” According to the authors,

“homogenation practices [adjustments to raw data] used until today are mainly statistical, not well justified by experiments, and are rarely supported by metadata. It can be argued that they often lead to false results: natural features of hydroclimatic times series are regarded as errors and are adjusted.”

“While homogenation is expected to increase or decrease the existing multiyear trends in equal proportions, the fact is that in 2/3 of the cases the trends increased after homogenation”

“The above results cast some doubts in the use of homogenation procedures and tend to indicate that the global temperature increase during the last century is smaller than 0.7-0.8°C”

selected slides below, full presentation available here:

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