Category Archives: ACORN SAT

BoM latest Rolls Royce adjusted temperature series

Launceston temperature history illustrates how BoM inserts a large warming trend where raw data shows little change over 100 years

In 2012 the Australian Bureau of Meteorology brought out their ACORN SAT highly adjusted and warmed temperature data for just over 100 stations with all data commencing in 1910. Launceston starts in 1885 but the early data has gaps so we start at 1910 comparing raw data trends with warming trends from the BoM highly adjusted ACORN SAT.

It looks clear that the data as collected over more than 100 years shows no significant warming.
Over twenty years ago I built the two Australian long term series
Average of 25 Regional and Remote Stations –
Average Temperature for the 6 Capital Cities
It looks as though I had not found the Launceston data at the time the above was contructed in 1991.
The aim is to update more long term stations data as collected and contrast with ACORN SAT.

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ACORN-SAT – The Australian Bureau of Meteorology temperature database – is not to be trusted

Guest article by Ed Thurstan – April 28, 2013
Abstract
The second release of ACORN-SAT confirms my 2012 contention that the Australian Bureau of Meteorology this temperature database should be withdrawn. The gross arithmetical errors it displayed in 2012 that were generated by the BoM’s data refining processes are still evident in the latest release. This indicates that the BoM either has not checked the product as stated, or they do not care that their errors are on public display.
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Read full article in 600KB pdf

Australian Bureau of Meteorology plays God by altering Adelaide historic temperature data – Frostgate 2

Lance Pidgeon raises a fascinating issue in his comment on my Frostgate 1 thread where he points out a report in The (Adelaide) Advertiser for 4 July 1933 that the 3rd July 1933 was the “COLDEST MORNING THIS YEAR”.
It is interesting here to check what the various BoM versions record for this frost event.
This segment of spreadsheet shows the BoM standard minimum readings in Celsius – with their latest (March 2012) adjusted & perfected ACORN data alongside. We see that for the 3 July ACORN reads 1.7 – OK but note how the 30 June in ACORN now reads 1.6 – which rewrites Adelaide history as recorded by the Advertiser that the 3 July was “COLDEST MORNING THIS YEAR”. The red A marks the day of The Advertiser article we are referring to – and the red NR marks the new “COLDEST MORNING THIS YEAR”.

How does the BoM possibly know now in 2012 that the 30 June 1933 was a colder morning at West Terrace Adelaide than 3 July ? Denying the evidence of the BoMs own standard temperature data read by expert observers at its South Australian Regional Office. This playing God with our temperature history can not be justified.
And while we are looking at the Differences Raw minus ACORN – how on earth can the BoM justify these constantly varying adjustments ?
How do they know that on the 6th July the 10.2 recorded was EXACTLY correct for all time ? While all the other morning readings from 20th June to 10th July were faulty by greatly varying amounts.

Frostgate 1 – Australian Bureau of Meteorology altering temperature data – rewriting Melbourne climate history by eliminating many frosts

Jointly with Ed Thurstan.
Since the mid 1990’s the BoM has produced several adjusted versions of Australian temperature history – these add more warming trend than the raw data show and many climate sceptics have been rightly critical of these BoM “high quality” (HQ) versions – what could be termed “stroked and tweaked” data.
In March the BoM released its latest version of adjusted temperature data termed ACORN SAT and time series of daily max and min ACORN data for 111 stations can be downloaded.
There has been criticism of the way BoM HQ or ACORN data reduces hot days from the past – particularly pre mid 20th Century – which increases the warming trend. But fancy arguments can be raised as to whether the temperature in the distant past was measured in an exactly equivalent manner to modern data. However frosts are a different matter – constituting a marker of air temperature independent of thermometers.
Examining both the ACORN daily minimum temperature data for Melbourne Regional Office (BoM Station 86071) and the raw BoM data we found many frost mornings in the raw data (minimums below 0 degrees C) that were altered to non-frost days in the ACORN version (minimums above 0 degrees C) – see this example from August 1944 where the BoM in their 2012 ACORN data wipe out 3 frost days.
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However in this case it is bad luck for the BoM that the online newspaper archive of the National Library of Australia has the Argus newspaper for the 9th August 1944 reporting the “THIRD SUCCESSIVE FROST”.

These inconvenient facts expose the BoM as writers of climate fairy stories –
from what should be the best maintained set of weather instruments in the Nation – expertly observed.