My new study of Australia’s climate regime reveals two stages: cooling since the start of records at 1910, followed abruptly at circa 1955 by linear heating to the present at a transcontinental mean of circa 2 degrees per century (DPC). This history is abundantly clear in Australia’s suite of over one hundred internationally-accredited highest-quality ACORN-SAT weather stations.
The study has a much larger outcome: it reveals a new reality in the world and hemispheric heating graphs. Their heating history, from their still-valid startdate of circa 1917, is a segmented one embodying several consecutive events, not their mean line to the present which is artificial and does not represent any event.
Each of these planetary-scale climate regimes contains a significant cooling event in the middle of the 20th century. This has the inherent effect of delivering a mean artificial heating rate which is substantially lower than the component real heating events. The current real heating rate in each regime is evidenced only in the last segment of each graph, which is inherently steeper – faster – than the mean heating rate. The world and Australian “mantra rate” of 1 DPC requires recalibration: the world rate to 2.1 DPC, the northern hemispheric rate to 2.6 DPC, the southern hemispheric rate to 0.93 DPC, and the Australian rate to 1.6 DPC for mean temperature and 2.3 DPC for minimum temperature.
The world is heating at a rate substantially faster than the mantra rate of 1 DPC which needs to be discarded.