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Australian Met Office Accused Of Man-Made Climate Change

by Graham Lloyd
February 18, 2019, 2:19 PM
in News and Opinion
Reading Time: 3 mins read
A A
3

sydney australiaThe Bureau of Meteorology has rewritten Australia’s temperature records for the second time in six years, greatly increasing the rate of warming since 1910 in its controversial homogenized data set.

Rather than the nation’s temperature [showing it has] increased by 1C over the past century, the bureau’s updated homogenized data set, known as ACORN-SAT, now shows mean temperatures have risen by 1.23C.

Bureau data shows the rate of mean warming since 1960 has risen to 0.2C a decade, putting the more ambitious IPCC target of limiting future warming to 1.5C close to being broken.

Homogenization of temperature records is considered necessary to account for changes in instrumentation, changes in site locations and changes in the time at which temperatures were taken.

But the bureau’s treatment of historical data has been controversial. In recent years there have been claims that the organization was treating temperature records in such a way that left it exposed to accusations that ideological pursuits had trumped good scientific practice.

Former prime minister Tony Abbott unsuccessfully pushed for a forensic investigation into the bureau’s methods.

A number of reviews of the bureau’s network equipment and its temperature data handling have been carried out. A technical panel found the homogenization methods used were largely sound.

But a key recommendation, to include confidence levels or error margins in the data, remains unfulfilled. A BoM spokesman said work was underway on a number of scientific papers looking at uncertainty and confidence intervals for temperature data observations, adjustments, and national averages.

“This work will be made available to the public following a thorough peer review,” the spokesman said.

The bureau had fiercely defended the accuracy of its original ACORN-SAT data. But the more recent analysis, including the removal of rounding errors, has effectively increased the rate of warming by 23 percent, compared with the earlier homogenized ACORN version-one data.

Detailed technical information on the ACORN-SAT update was published late last year, but there has been no public announcement of the revised data, which is now considered the official national average temperature record.

A bureau review of the homogenized data said the new version had “increased robustness and greater spatial coherence”.

The updating of the ACORN-SAT data coincided with the release last October of a new version of US weather agency NOAA’s global land temperature data set.

A bureau spokesman said ACORN-SAT version two was the bureau’s “improved official homogeneous temperature data set”.

The new data set benefited from “the numerous scientific and technological advances which have occurred over the past six years, as well as the insights and recommendations from an independent ACORN-SAT technical advisory forum”.

“It also contains new data which was not previously available when the bureau developed the first data set,” he said.

The bureau said the updates had been independently peer-­reviewed, and the findings were that the methodology was “rigorous and reliable”.

Scientist Jennifer Marohasy said that while version two of the data had used the same set of 112 stations as had been used in version one, the data had been remodeled relative to the raw data and also relative to the remodeled version one.

The bureau said the data in version two was subjected to two rounds of homogenization, as had been the case with version one.

“In total, 22 of the 966 adjustments applied in version two of the ACORN-SAT data set arose from this second-round procedure,” the bureau said.

A technical analysis of ACORN-SAT 2 by the bureau said 1910-2016 trends in Australian temperature were about 0.02C a decade higher than those found in version one. It said rounding errors in version one accounted for much of the new trend.

Dr. Marohasy said the bureau had not explained how it could have generated a 23 percent increase in the rate of warming, just through updating the official ACORN-SAT record.

The maximum-temperature trend from 1910 to 2016 at the 112 ACORN-SAT weather stations is now an increase of 0.116C a decade. It was 0.09C a decade in the earlier homogenized data.

The minimum-temperature trend is now an increase of 0.13C a decade, compared with 0.109C in ACORN-SAT 1.

The bureau said improved accounting for the widespread relocation of sites out of towns during the 1990s and 2000s, and the incorporation of recent data from new sites were also substantial contributors.

Dr. Marohasy said the movement of sites was meant to be part of the adjustments made in the first version of the data.

“The incorporation of data from new sites may account for some of the 23 percent increase,” Dr. Marohasy said, “because the bureau has opened new sites in hotter western NSW, while closing higher-altitude weather stations, including Charlotte Pass in the Snowy Mountains.”

h/t GWPF

Read more at The Australian

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Comments 3

  1. Curious says:
    7 years ago

    How can they quote a mean temperature to 2 decimal places? Were the original readings that accurate? How do they “adjust” temperatures when they don’t know what the correct value is? This is surely just biased nonsense masquerading as science – utter rubbish! No wonder politicians love it!

    Reply
  2. David Lewis says:
    7 years ago

    Why is it that when ever data is changed by the Met Office, NOAA, or satellite data is changed, it is always in favor of the climate change cause? The answer is simple. The technical politically motivated people know that the raw data doesn’t support action on climate change.

    Reply
  3. Amber says:
    7 years ago

    When did honesty cease to be a virtue ? Lying bought climate scientists
    changing data to fit the narrative . Oh well we only have to put up with it less than 12 years according to former bar tender AOC and her eco-anarchist friends .

    Reply

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