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40 Articles

History Of How The Hockey Stick Was Manufactured

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Northern temperatures declined 0.7 C from 1940 to 1970 according to a 1975 NAS report. Steve Goddard documents the temperature data manipulation to reduce the temperature record before 1950 to reduce this temperature decline, which conflicted with climate models. Tree ring data by Keith Briffa showed a large decline, which was deleted for the IPCC reports.

The Gergis Paper Debunking - Peer Review is Inadequate

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Scientists at the blog Climate Audit reviewed the Gergis paper which claimed to find that recent temperatures in Australia are the warmest in a millennium. The review found that the paper does not describe what was actually done, and the results are invalid. The scientists found insignificant correlations between the proxies and instrument temperature measurements. The Journal of Climate was forced to put the paper "on hold", demonstrating that the journal's peer review process is inadequate.

Climategate Continues - Yamal

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The climategate emails released in 2009 had much discussion about a tree-ring temperature reconstruction by Keith Briffa from trees in the Yamal area in Siberia. The series had very few trees; 12 tree cores in 1988 declining to 5 in 1995. The series showed a large increase in the 20th century, but the "hockey stick" shaped increase was almost entirely due to one tree - YAD06. The emails show that a larger selection of trees were available but not used. After a 4-year battle to obtain data of the larger area, Steve McIntyre obtained a list of sites. Using all the data, the "hockey stick" increase disappeared.

USHCN Surface Temperatures: Dramatic Warming Adjustments

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Dr. Roy Spencer analyzed the United States Historical Climate Network (USHCN) temperature index and reports that virtually all of the USHCN warming since 1973 appears to be the result of adjustments NOAA has made to the data, mainly in the 1995-97 timeframe. The linear USHCN 1973 to 2012 temperature trend is 19 times the population adjusted temperature trend from the International Surface Hourly dataset.

The Shakun Debacle - Temperature or CO2 Leads?

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A recent paper by Shakun et al purports to show that CO2 increases preceded temperature rise during the last deglaciation, directly contradicting numerous previous studies. A detailed examination of the data used in the paper shows that the conclusion is not supported by the data. The paper alleges that the end of the last ice age was caused by orbital changes that initiated solar warming of the north region which reduced the Atlantic Ocean circulation and warmed the southern hemisphere. Without providing any evidence, that paper assumes that CO2 out-gassing from the southern oceans caused further northern hemisphere warming.

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