An unusual trio of three climate patterns brought heavy rainfall and an exceptionally wet but warm year for Australia in 2022.
An unusual trio of climate patterns brought heavy rainfall and an exceptionally wet but warm year to Australia in 2022, with temperatures remaining higher than average against the backdrop of human-induced climate change.
It was joined by a “negative” Indian Ocean Dipole in winter and spring, which also increases rainfall, and a persistent “positive” phase of the Southern Annual Mode, which is associated with storms and cold fronts that move from west to east, bringing rainfall to southern Australia. There was also a lack of extreme heat in Sydney, for example, which had no days over 32. In Melbourne, to date, it has been more than 1100 days since the temperature last reached 40 degrees at the Olympic Park weather station. That’s the longest stretch below 40 degrees for about 50 years.
In addition to the influence of natural drivers, Australia’s climate is increasingly affected by global warming. It has warmed on average by 1.47 degrees between when national records began in 1910 and 2021, with most of the warming occurring since 1950.
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