The Mathematics of Carbon Dioxide Part 3 - Guest essay by Mike Jonas Introduction This article is the third in a series of four articles. Part 1 of the series (Part 1) is here Part 2 of the series (...
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Although GISS can truthfully say they have not adjusted the GHCN data, the splicing of the last 6 years of the Post Office dataset to the warmer Gladstone Radar leads to a trend of 1.7 degrees Celsius per Century.Ken is a retired school headmaster and his blog is concentrating on graphical analysis of temperature data relating to Australian towns and cities.
I have shown three possible options for more appropriate adjustments to combine all temperatures at the one site. Of these, the highest trend is about 1.5 degrees, which is close to the trend (1.4 degrees) of the nearest rural sites. Examination of these sites shows that their data is of questionable quality. The second option produces a trend of 0.9 degrees, and the third and (in my opinion) best option, 0.7 degrees. The average trend of the 5 nearest long-record rural sites (0.8 degrees) is between these last two options and so matches well. Nearby cities of Rockhampton and Bundaberg show adjusted trends of about 0.7 and 0.5 degrees respectively, and Maryborough, ignored by GHCN, shows a trend of 0.4 degrees.