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Climate change emails between scientists reveal flaws in peer review
...The head of the CRU, Professor Phil Jones, as a top expert in his field, was regularly asked to review papers and he sometimes wrote critical reviews that may have had the effect of blackballing papers criticising his work.

Here is how it worked in one case.

A key component in the story of 20th-century warming is data from sparse weather stations in Siberia. This huge area appears to have seen exceptional warming of up to 2C in the past century. But in such a remote region, actual data is sparse. So how reliable is that data, and do scientists interpret it correctly?

In March 2004, Jones wrote to ­Professor Michael Mann, a leading climate scientist at Pennsylvania State University, saying that he had "recently rejected two papers [one for the Journal of ­Geophysical Research and one for Geophysical Research Letters] from people saying CRU has it wrong over Siberia. Went to town in both reviews, hopefully successfully. If either appears I will be very surprised".

He did not specify which papers he had reviewed, nor what his grounds for rejecting them were. But the Guardian has established that one was probably from Lars Kamel a Swedish astrophysicist ­formerly of the University of Uppsala. It is the only paper published on the topic in the journal that year.

Kamel analysed the temperature records from weather stations in part of southern Siberia, around Lake Baikal. He claimed to find much less warming than Jones, despite analysing much the same data.

Kamel told the Guardian: "Siberia is a test case, because it is supposed to be the land area with most warming in the 20th century." The finding sounded important, but his paper was rejected by Geophysical Research Letters (GRL) that year.

Kamel was leaving academic science and never tried to publish it elsewhere. But the draft seen by the Guardian asserts that the difference between his findings on Siberia temperatures and that of Jones is "probably because the CRU compilation contains too little correction for urban warming." He does not, however, justify that conclusion with any data or analysis.Kamel says he no longer has a copy of the anonymous referee judgments on the paper, so we don't know why it was rejected. The paper could be criticised for being slight and for not revealing details about its methods of analysis. A reviewer such as Jones would certainly have been aware of Kamel's views about mainstream climate research, which he had called "pseudo-science". He would also have known that its publication in a journal like GRL would have attracted the attention of professional climate sceptics. Nonetheless, the paper raised important questions about the quality of CRU's Siberian data, and was a rare example of someone trying to replicate Jones's analysis. On those grounds alone, some would have recommended its publication....