Anybody following the BoM responses to the series of articles in The Australian questioning the ACORN adjustments has heard this old canard from the BoM. “Oh but our adjustments make no overall difference – the raw trends are the same as ACORN trends”. This can only be true by including the cooling corrections the BoM chooses to make moderating the raging UHI’s contamination in Australian city data.
Check the ‘adjustments’ graph at the BoM ACORN site. All ‘reduced’ adjustments occur prior to 1970 and all ‘upward’ adjustments are made after 1990 (between 1970 and 1990 there is little adjustment – some up, some down).
The 1914-15 adjustments seem to be about 0.25C.
www.bom.gov.au/climate/change/acorn-sat/#tabs=Adjustments
Scroll down to see and make your own adjustments.
Whoops
‘…make your own judgements’.