Picture: Dr Jennifer Marohasy – Scientist 

Australia’s Bureau of Meteorology has quietly altered historical temperatures to ensure official records align with its “global warming” narrative.

The unannounced changes were posted on the bureau’s website last month, effectively cooling the past and warming the present.

• Without scientific justification historical temperatures are dropped down, cooling the past.
• December’s adjustments were the third set of alterations undertaken by the bureau since 2013.
• The impact of the adjustments was to cool the past and so, therefore, warm the present.

According to scientist Jennifer Marohasy, the bureau’s actions are an attempt to “generate more global warming for the same weather”.

“I have shown repeatedly, including in peer-reviewed publications, that without scientific justification historical temperatures are dropped down, cooling the past,” Dr Marohasy told The Australian newspaper this weekend.

HOTTER

“This has the effect of making the present appear hotter – it is a way of generating more global warming for the same weather.”

Dr Marohasy, a critic of the bureau’s “homogenisation” process, said the daily maximum and minimum values in the national temperature dataset were different from the actual recorded historical value, often by several degrees, and usually cooler.

December’s adjustments were the third set of temperature alterations undertaken by the Bureau of Meteorology since 2013.

Then prime minister Tony Abbott launched an enquiry into the bureau’s questionable activities, however, this was quickly dropped after he was rolled by Malcolm Turnbull.

Independent analysis of the 2021 adjustments show 0.06C was added to maximum warming temperatures and 0.11C to the minimum from 1910-19 compared to 2010-19

Climate researcher Chris Gillham said while the changes were not large, they were changes nevertheless.

IMPACT

“The impact of the adjustments was to cool the past and warm the present,” he said.

The bureau declined to comment on Mr Gillham’s research, instead citing international reviews regarding its homogenisation practices.

“These external reviews expressed overall confidence in the bureau’s practices and found its data and analysis methods to be among the best in the world,” a BoM spokesman said.

The bureau said adjustments were necessary to reflect the relocation of weather recording equipment.

It claims that, based on its records, 2021 was the 19^th warmest year since national records began in 1910, but also the coolest year since 2012.