I recall ACORN SAT was birthed in early 2012 – during 2012 climate researcher Ed Thurstan found ~1000 instances where the daily min exceeded the daily max.
Pretty much evidence that the entire ACORN adjustment process had fatal flaws I would have thought.
Remember these ~1000 min>max errors would just be the visible population of errors – like the visible “tip of the iceberg”.
Amazing that the BoM with their colossal computing facilities failed to check ACORN SAT for basic errors such as min>max before launch.
Fast forward to 1 July 2013 and we see a BoM staffer Dr Blair Trewin responding on the Tamino blog 1 July 2013 on the issue that ACORN-SAT has adjusted many hundreds of daily minimums so they exceed the daily max. This makes for an “internal inconsistency” according to Dr Trewin – and to fix this he said and I quote – “…so in the next version of the data set (later this year), in cases where the adjusted max < adjusted min, we’ll set both the max and min equal to the mean of the two.”
I was surprised when downloading ACORN data in March and April to see these errors still there – I mean how hard can it be for the BoM to repair ACORN SAT and crunch out a new version.
Maybe too hard.
On 30 April I emailed the Director of the BoM
Here is his reply page 1 -
Page 2 -
Where he avoids the issue that the standout min>max errors are just the visible “tip of the iceberg”.
Anyway all will be fixed in “second half of 2014″ nearly three years after the birth of ACORN SAT.
Once again amazing that near two years from these errors being found by Ed Thurstan and the BoM is still promulgating this error ridden ACORN SAT dataset.
And remember ACORN SAT was “peer reviewed” by the great and the good of IPCC climate science.