Author Archives: climanrecon

Climate Distortion in ACORN-SAT, Part 3

Author: Dr. Michael Chase Photo above: Kerang, Victoria, circa 1930 ACORN-SAT is the outcome of a “system” for detection and correction of non-climatic influences on surface air temperature data recorded in Australia. Previous posts have dealt with errors in the … Continue reading

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Climate Distortion in ACORN-SAT, Part 2

Author: Dr. Michael Chase A recent post dealt with the flaw in ACORN-SAT that it makes the erroneous assumption that all step changes in temperature arise from persistent non-climatic influences. This post illustrates a potential “false alarm” problem with the … Continue reading

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Sheds and Weather at Kalgoorlie

Photo above: Kalgoorlie, Western Australia, circa 1930 Author: Dr. Michael Chase This post looks at monthly averages of daily maximum temperatures recorded at Kalgoorlie, and surrounding areas, in the inter-war years of 1920-40, during which ACORN-SAT makes two adjustments. The … Continue reading

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Temperature Homogenisation Errors

Author: Dr. Michael Chase “When breakpoints are removed, the entire record prior to the breakpoint is adjusted up or down depending on the size and direction of the breakpoint.” Extract above from: http://berkeleyearth.org/understanding-adjustments-temperature-data/ Temperature measurements have two classes of non-climatic … Continue reading

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Climate Distortion in ACORN-SAT

Author: Dr. Michael Chase Source of the figure above: http://www.bom.gov.au/climate/change/#tabs=Tracker&tracker=timeseries Summary There is considerable climate distortion in the ACORN-SAT version of surface air temperatures of Australia from 1910 to present, with most of the distortion in the first half of … Continue reading

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Historical Temperatures at Alice Springs

Paul Matthews has recently reported on the highly unstable versions of temperatures at Alice Springs (and elsewhere) in GHCN: Instability of GHCN adjustment algorithm Several years ago Roger Andrews raised doubts about GHCN temperature homogenisation at Alice Springs: https://tallbloke.wordpress.com/2012/10/11/roger-andrews-chunder-down-under-how-ghcn-v3-2-manufactures-warming-in-the-outback/ These blog … Continue reading

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Issues with AEMO Forecasting, Part 3

The AEMO models the future adequacy of the NEM electricity system, one of the key outputs being an annual “Electricity Statement of Opportunities” (ESOO), whose stated purpose is to alert industry to potential opportunities for new generators. This post is … Continue reading

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Issues with AEMO Forecasting, Part 2

The previous post looked at a demand-side issue with AEMO electricity forecasting, this post deals with an issue concerning the contribution of wind power to meeting peak demands. In summary, it appears that AEMO decouples historical wind power from historical … Continue reading

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Issues with AEMO Forecasting, Part 1

The AEMO does a lot of modelling of the NEM, to assess such things as the adequacy of the future generating capacity to meet peak demands, and of the transmission system to cope with new and lost generators. A key … Continue reading

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South Australian response today to 2014/15 weather

Introduction This post repeats the analysis of the previous one, this time for the summer weather of 2014/15 in South Australia (SA), with 2016/17 wind farms. The maximum demand in SA in summer 2014/15 was quite low, an outcome that … Continue reading

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