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Victor Venema

As far as I can see the main novelty is that the weather station classification scheme of Leroy (2010) is better than Leroy (1999).

It would have been more elegant if Watts had stated in his press release that the differences between stations of various qualities he found in the temperature trends are only visible in the raw data. In the homogenized (adjusted) data the trends are about the same for all quality classes. No more sign of errors due to the urban heat island.

That the trend is stronger in the homogenized data is no surprise, the transition to automatic weather stations during the study period has caused an artificial cooling in the raw data.

For a bit more detailed “review, please visit my blog.

http://variable-variability.blogspot.com/2012/07/blog-review-of-watts-et-al-2012.html

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