Jo Nova reports:
Ken Stewart has been hard at work again, this time analyzing the Australian urban records. While he expected that the cities and towns would show a larger rise than records in the country due to the Urban Heat Island Effect, what he found was that the raw records showed only a 0.4 degree rise, less than the rural records which went from a raw 0.6 to an adjusted 0.85 (a rise of 40%). What shocked him about the urban records were the adjustments… making the trend a full 70% warmer.
The largest adjustments to the raw records are cooling ones in the middle of last century. So 50 years after the measurements were recorded, officials realized they were artificially too high? Hopefully someone who knows can explain why so many thermometers were overestimating temperatures in the first half of the 1900’s.
50 years later?
Remember Dr. David Jones, Head of Climate Monitoring and Prediction, National Climate Centre, Bureau of Meteorology said:
“On the issue of adjustments you find that these have a near zero impact on the all Australian temperature because these tend to be equally positive and negative across the network (as would be expected given they are adjustments for random station changes).”
Yet it’s obvious that there are far more warming adjustments than cooling ones, and remember, many (almost all?) of these urban sites will be markedly different places than what they were in say 1920. The encroachment of concrete, cars and exhaust vents can surely only go in one direction, though I guess, it’s possible all these sites have new sources of shade (why aren’t the themometers moved, if that’s the case?) Like the rural records, the temperatures overall are roughly a quarter of a degree higher after the “corrections”.
Read the entire report here
Stay tuned to WUWT, as in the next couple of days I’ll publish yet another shock related to how climate scientists view temperature data. – Anthony