Guest essay by Ed Thurstan
The Australian Bureau of Meteorology (BoM) released a new temperature dataset – the “Australian Climate Observations Reference Network – Surface Air Temperature“ (ACORN-SAT) in early 2012, with data to the end of 2011. It is supposedly a ground-breaking daily homogenised dataset.
Ground-breaking it certainly is. The BoM has brought new meaning to the term “temperature inversion”. In “refining” the data, the homogenisation process creates, from apparently normal reported daily raw Max/Min data, homogenised data where the Maximum daily temperature is less than the Minimum temperature for that same day. This error is visible in 70 of the 112 stations included in the ACORN-SAT dataset.
In February 2013 the BoM released an update to the previous ACORN-SAT dataset, adding 2012 to the dataset. But the BoM has not corrected the previous errors a year later in their latest release.
I find that:
· The methods…
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