Season 5 of the series Australia’s Broken Temperature Records – All 224 Homogeneous Temperature Series – Including the Bombing of Darwin
Repost from Jennifer Marohasy’s Blog
March 31, 2022 By jennifer
I could hardly be accused of cherry picking if I presented all temperature series – all four repeats of the homogeneous ACORN-SAT temperature series are charted with the raw historical series from the Australian Data Archives of Meteorology (ADAM). ADAM is a little known data set contains unaggregated values: the temperature values as they were recorded.
The extent of their remodeling is frustrating, including for Darwin, where the most recent repeat temperatures in the historical record were artificially cooled, including during World War 2.
Darwin was bombed by the Japanese 64 times during World War 2. The first air raid destroyed the post office weather station and killed the postmaster, but Darwin also had a working weather station at the airport. been active for almost a year.
The Australian War Memorial will never change important historical war records, however the Australian Bureau of Meteorology has overhauled Darwin’s temperature records reducing the maximum temperature during World War 2 to mid averaged 1°C in 1941 and averaged 0.5°C in 1942. The bureau did this by varying the temperature daily. For example, on 18order February 1942 – the day before the first air raid and the last day of the evacuation of civilians – the maximum temperature recorded at the airport was 31.1°C in the Australian Meteorological Data Archive (ADAM). But when I looked in the Australian Official Climate Observation Reference Network – Surface Air Temperature Database (ACORN-SAT), the maximum temperature for that day had cooled down. down to 30.1°C. This revisionist approach to our climate history affects Australia’s wartime record because weather and climate are so important to strategy military.
In March 2012, when Version 1 of the ACORN-SAT was published, the Bureau stated in its catalog that temperature records in Darwin prior to 1 January 1937 contained an abnormal cooling caused by trees. hidden. Somewhat oddly, this was later used as an excuse to adjust all temperatures down before this date back to 1910, in fact significantly cooling the original record. At the time, there were no changes to daily temperatures during World War 2. Changes to war records were made in 2018, during the development of ACORN-SAT version 2.0 and has been migrated to current version ACORN-SAT 2.2.
Just this month, I updated an interactive panel on my website that shows the extent of remodeling of the temperature record by plotting a series of annual maxima and minima from each of the 112 ACORN pages- The SAT is identical (versions 1, 2.0, 2.1 and most recently 2.2) with actual maximum and minimum values from the Australian Data Archives of Meteorology (ADAM). There are 224 graphs with at least five temperature series in each (more when raw/ADAM data includes post offices as well as airport chains, etc.). Click through and play:
There is a lot of work in those charts and this is the only place on the internet where you can find them!
The Darwin maximum temperature comparison is typical and looks a bit messy because the temperature was originally recorded at the post office (green string) and the temperature was cooling down after the tornado in 1937. Bureau completely overhauled this cooling from the official record with the latest iteration being the ACORN-SAT version 2.2 (pink series) showing gradual warming from 1910 to the present. Consider the series initially from the post office (014016 green) and then the airport (014015 blue) that cools and then warms up.
It’s the fully remodeled version (pink string) not the original historical version (green and then blue string) that In is incorporated into the Annual Climate Report lamenting catastrophic man-made global warming.
The uniformity of the data is not the only factor influencing the overall warming trend. The Bureau truncated the historical record going back to 1910. According to Darwin, there is a perfectly good historical temperature record starting in 1895 when temperatures were recorded with a mercury thermometer in the Stevenson Monitor. There’s no reason to truncate or change this record, but the Bureau completely overhauls it to remove the early hot record (before 1910) and then reduce/cool down the daily values since 1980 until a linear trend (pink series) is generated.
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This is part 5 of the ‘Australian Temperature Records’ series. This 4,300-word blog post in a draft combines information about Darwin’s early war history and the story of the Darwin telegraph office that became the post office. An even longer version will be published as part of a book I’m writing on how to fix Australia’s broken temperature record.
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