Articles | Volume 29, issue 9
https://doi.org/10.5194/hess-29-2167-2025
https://doi.org/10.5194/hess-29-2167-2025
Research article
 | 
08 May 2025
Research article |  | 08 May 2025

Interdecadal cycles in Australian annual rainfall

Tobias F. Selkirk, Andrew W. Western, and J. Angus Webb

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Cited articles

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Short summary
This study investigated rainfall in eastern Australia to search for patterns that may aid in predicting flood and drought. The current popular consensus is that such cycles do not exist. We analysed 130 years of rainfall using a very modern technique for identifying cycles in complex signals. The results showed strong evidence of three clear cycles of 12.9, 20.4 and 29.1 years with a confidence of 99.99 %. When combined, they showed an 80 % alignment with years of extremely high and low rainfall.
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