WHILE the average Australian, being sentimental and having a nationalistic streak, would like to believe their Bureau of Meteorology is honestly recording and reporting temperatures, in reality the science managers are corrupting the official record. Following is another example, another story, to add to the litany as detailed in my unanswered letter to Minister Hunt and recent series of blog posts on Bourke.
KEN Stewart, a retired school principal, became interested in global warming some years ago. After the Bureau released their new so-called High Quality temperature dataset, he decided he would audit it – out of curiosity. He found that changes made to the original data could account for as much as one third of the reported global warming in Australia.
His queries to David Jones, Head of Climate Monitoring and Prediction at the Bureau, were dismissed with comment that the “adjustments” have “a near zero impact on the all Australian temperature”. Which would beg the question, why make the “adjustments” at all. Except that they do change the temperature, they create a significant warming trend.
Eventually, on 20th December 2010, Ken joined Jo Nova, Senator Cory Bernardi and several others to lodge a request to the Auditor-General for a formal audit of the Bureau’s climate data and advice.
But rather than defend the new dataset, the Bureau ditched it, in effect preventing the audit from going ahead.
Then in March 2012, the Bureau announced a new official temperature series this time called the Australian Climate Observations Reference Network- Surface Air Temperatures (ACORN-SAT).
This is the data series used by David Jones from the Bureau to announce in January that last year, 2013, was the hottest year on record ever in Australia.
This “record hot year” is in large part a consequence of the methodology used to construct ACORN-SAT. Ken’s most recent analysis shows that in the creation of ACORN-SAT the Bureau has “adjusted” temperatures both up and down, with almost all the “adjustments” down occurring before 1971, and all the “adjustments” up occurring after 1971. In other words the record before 1971 is cooled, and after 1971 warmed.
The mean difference in the minima trend (ACORN-SAT minus original data), according to Ken, is +0.37 degrees Celsius. Interestingly the difference in the maxima trend is much less, +0.09 degrees. This has the effect of exaggerating warming of the minima, creating a pattern consistent with anthropogenic global warming theory expectations.
The most extreme example that Ken found of data corruption was at Amberley, near Brisbane, Queensland, where a cooling minima trend was effectively reversed, Figure 1.
Ken Stewart is a retired school principal with a deep-seated scepticism for anything produced by governments, political parties, religious organisations, big business and Greenpeace. Ken believes in family, the power of learning, the importance of asking good questions and finding answers for yourself.