The warming bias in Australia’s ACORN-SAT maximum dataset is largely due to just two adjustments.
Last week’s Report of the Technical Advisory Forum’s review of the ACORN-SAT temperature reconstruction produced some rather bland, motherhood type statements. However, hidden in the public service speak was a distinct message for the Bureau of Meteorology: lift your game. Two of the areas I have been interested in are (a) whether individual adjustments are justified, and (b) the effect of these adjustments on national and regional temperature trends. In this post I look at adjustments at just two sites, which are responsible for the single largest increase in national trend.
On page 17 of the Report we find the following graphic:
Fig. 1: Scatterplot of difference between AWAP and Acorn annual mean temperature anomalies.
This is a clear statement of how much Acorn adjustments have cooled past temperatures, as AWAP is regarded as being…
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