I have been digging into my archives and have discovered some of my temperature data downloads from GISS with their tapered UHI adjustments. Here is their work for Melbourne.
Do any readers remembers those efforts by GISS ? I have several more examples I can show later that essentially adjust strongly warming city data to show a near neutral trend. Maybe these tapered UHI adjustments (click for chart of exact adjustments) did not please everybody because post 2000 GISS started making homogeneity adjustments using satellite night lights – I am not sure if that method is still used. In recent years I have tended to lose track of what they do once they started adjusting rural data to agree with UHI affected cities.
Looks too sensible for GISS to have kept doing it. I mean the meme is global warming.
That tampering for Melbourne’s record is an amazing maximum of 1.75 degrees. It is obviously intended to convert a clearly cooling trend into a warming trend, following Head Office directives to the letter. This has nothing to do with UHI which has steadily increased as Melbourne grew. The process is the opposite of a scientific process.
I have been watching Broome temperature changes to check the time of the maximums, compared to flight arrivals and departures. It appears there is a regular spike showing close to departure times of around 1C, which was a bit surprising.
pindanpost.com/2015/12/14/airport-heat-islands-artificial-maximum-temperatures/