op ed: can we talk about it now?, page-36

Excerpts From Joannenova 15th jan --The Australian BOM say this current pattern of extreme heat is “consistent with climate change”

This pattern of extreme heat is also consistent with Australia’s historical records set when human green house gas emissions were a fraction of what they are today.

With any record set in the modern era, you need to know two things. One is that The BOM’s raw data adjustments have increased the warming trends in the raw data by around 40%.

The second is that when asked, Dr David Jones, Head of Climate Monitoring and Prediction, National Climate Centre, Bureau of Meteorology, stated untruthfully that the adjustments made “a near zero impact on the all Australian temperature trends”. When clearly the adjustments which effectively gave an overall greater warming trend by about 40% after the BOM adjustments.

BOM Excuse for deleting some long held temperature records- Description of stevenson box ( the BOM doesnt release data on the box locations about 200 in Australia)

The BOM state that to measure the temperature of the air accurately, it is important that the thermometer is shielded from direct sunlight but is still exposed to a good airflow. The standard screen used internationally to shelter instruments is a double-louvred wooden box, with the instruments 1.2 to 2.0 metres above ground level. This screen, known as ‘a Stevenson screen’, was designed by Thomas Stevenson (1818-1887), a British civil engineer and father of Robert Louis Stevenson. The use of a standard screen allows temperatures to be compared accurately with those measured in earlier years and at different places.

The Stevenson screen was first introduced to Australia in the 1880's and was installed everywhere, with a few exceptions, by 1910. Prior to this date, thermometers were located in various types of shelter, and locations particularly by trained explorers and early landowners, post masters telegraph station attendants and the like who saw it as an important part of their duty. The Stevenson Screens were in fact designed to try to replicate the conditions in which they had been measuring temperature already in most cases. So unless it was clearly documented that the method prior to the installation of the Stevenson Screen was deficient, there would be no reason to disregard the earlier records from the BOM records.

However that is what BOM appears to have done, particularly when the high temperature records were long dated. It is strange that even the the Stevenson Screens were installed by 1910, it took the BOM until the early 2000's to decide to axe some of Australia’s oldest temperature records.

But they cant be expunged from historical records which is where our team dug some up.

Also strangely, the BOM seems to have no problems with the many temperature stations which are sited in areas where there has been substantial urban and industrial growth which will impact more recent warming due to the Urban Heat Island Effect.

Three reasons the temperature records are officially meaningless
1.the BOM ignores countless historical records of extreme heat,
2.older record temperatures are ‘adjusted’ lower making the modern temperatures appear to be new “records”, and
3.the BOM don’t tell the truth about the net overall effect the adjustments make to the temperature trends
The BOM data is thus very unscientific and adjusted to suit and has been found error prone in the past !Is it likely to be any less dodgy now? Global warming may be occurring at a slow rate but the temperature measurements are so inaccurate in Australia that change is within the margin of error!
GISS data has been similarly adjusted!How can we then really know what is happening?