Continuing from the previous post about the newly developed HadCRUT4 global temperature dataset, it continues to come out in frustratingly small bits and pieces. The paper describing the HadCRUT4 revisions is here.
The latest is a press release issued by the UK Met Office on 19th March that contains nothing new about the adjustments made to HadCRUT3 to obtain the new dataset. It does however list the top ten warmest years in both datasets.
This is an exercise in how not to present statistical data, and in drawing too much from it. It does what any good science teacher instructing A-Level science would admonish pupils for if they did the same.
In HadCRUT3 the warmest year was 1998 with a temperature anomaly of 0.52 dec C, followed by 2010 with 0.50 and 2005 with 0.47. Although bear in mind this is the ‘other’ version of HadCRUT3 being used, link not available, that is quoted far less frequently than the ‘usual’ version of HadCRUT3 in which 1998 has a temperature anomaly of 0.53, 2010 has 0.47 and 2005 also 0.47. You will note that the major change between the two HadCRUT3 versions is that 2010 has been increased by 0.03 deg C.
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