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Nonlinear Processes in Geophysics (NPG) and Nonlinear Processes in Geophysics Discussions (NPGD) are published under licence by Copernicus GmbH (Copernicus Publications). The licenser is EGU – European Geosciences Union GmbH, HRB 222584, county court Munich, Germany.

NPG ISSN 1023-5809 eISSN 1607-7946 https://npg.copernicus.org/articles/

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Image credit to: Leonardo da Vinci, Movement of Water: Royal Collection Trust/© Her Majesty Queen Elizabeth II, 2014 Abstract background: iStock.com/Pulvas Mandelbrot: Daniel Schertzer, 2014

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