The result of their manipulation has been to create a warming trend when in reality, there’s been a cooling trend. But Australia’s Bureau of Meteorology (BOM) claims that they didn’t manipulate anything; that they “used world’s best practice and a peer reviewed process to modify the physical temperature records that had been recorded at weather stations across the country.” The Australian reported:
Researcher Jennifer Marohasy claims the adjusted records resemble “propaganda” rather than science.
Dr Marohasy has analysed the raw data from dozens of locations across Australia and matched it against the new data used by BOM showing that temperatures were progressively warming.
In many cases, Dr Marohasy said, temperature trends had changed from slight cooling to dramatic warming over 100 years.
It said data from a selection of weather stations underwent a process known as “homogenisation” to correct for anomalies. It was “very unlikely” that data homogenisation impacted on the empirical outlooks.
In a statement to The Weekend Australian BOM said the bulk of the scientific literature did not support the view that data homogenisation resulted in “diminished physical veracity in any particular climate data set’’.
Historical data was homogenised to account for a wide range of non-climate related influences such as the type of instrument used, choice of calibration or enclosure and where it was located.
“All of these elements are subject to change over a period of 100 years, and such non-climate related changes need to be accounted for in the data for reliable analysis and monitoring of trends,’’ BOM said.
Account is also taken of temperature recordings from nearby stations. It took “a great deal of care with the climate record, and understands the importance of scientific integrity”.
Dr Marohasy said she had found examples where there had been no change in instrumentation or siting and no inconsistency with nearby stations but there had been a dramatic change in temperature trend towards warming after homogenisation.
She said that at Amberley in Queensland, homogenisation had resulted in a change in the temperature trend from one of cooling to dramatic warming.
She calculated homogenisation had changed a cooling trend in the minimum temperature of 1C per century at Amberley into a warming trend of 2.5C. This was despite there being no change in location or instrumentation.
Somehow, messing with data like this is acceptable, all because it’s been “peer-reviewed.” If they had tried to publish the data showing a cooling trend, their “peers” wouldn’t have approved it.