random wrote on Dec 19
th, 2019 at 8:03pm:
But for others who just accept the science that the BOM and CSIRO publishes, they might be phased, you know casuse they don't know what ACORN-2 "data" is.
Poor petal. ACORN-2 is the new update from ACORN-1 adjustments.
In it they adjusted something like
196 209 records for statistical reasons. Exactly how statistics can tell whether records are categorically wrong and can be calculated is not disclosed. You can't make adjustments on old site moves because the microclimate will differ. That may not apply to modern moves because they may have operated two sites siultaneously and can be confident of any adjustments. But all of those should have occurred under the ACORN-1 adjustments.
"Reason for adjustment Maximum temperature Minimum temperature
Statistical 209 244
Site moves (all) 176 170
Screen change or condition 79 77
Site condition (without move) 9 5
Observation time change 2 24
Total 450 491
Table 7 ACORN-SAT version 2 adjustments by cause. Totals do not add as some adjustments have multiple causes. "
http://www.bom.gov.au/climate/change/acorn-sat/documents/BRR-032.pdfBTW - Screen changes Stephenson Screens have been made smaller. It has been shown that smaller screens add about 0.6C to the temperatures daily.
Edit: Once data is adjusted it is no longer data, which is why I called it "data".