![]() The encroachment of the EAC's traditional period of summer dominance into winter may have significant ecological implications through the acceleration of poleward range extensions by vagrant tropical species, facilitation of community phase shifts from temperate to tropical assemblages, and a phenological shift in the timing of major phytoplankton blooms. The annual period (generally in the austral summer) when the EAC is the dominant water mass in the region increased by approximately 2 months over the model time series. Applying our method to data from a 22-year free running regional hydrodynamic model revealed significant decadal-scale changes to EAC dynamics in the region. In order to more accurately quantify variability and trends in penetration of the EAC we develop a novel machine-learning classification approach to quantify variability in coastal EAC dynamics along a latitudinal gradient within the EAC extension zone in southeastern Australia. It can therefore be difficult to track EAC dynamics across both space and time using traditional analytical approaches. The EAC is a highly variable system that is formed by temporally-varying mixtures of water in the Coral Sea that do not form a linear density gradient or conform to a set range of temperature and salinity values. ![]() The East Australian Current (EAC) is a southward flowing western boundary current that transports relatively warm and nutrient-depleted subtropical water along Australia's east coast. 4School of Mathematics and Statistics, UNSW Sydney, Sydney, NSW, Australia. ![]() 3Environmental Research Division, NOAA Southwest Fisheries Science Center, Monterey, California, CA, United States.2Institute of Marine Sciences, University of California, Santa Cruz, Santa Cruz, CA, United States.1Department of Biological Sciences, Macquarie University, Sydney, NSW, Australia.Phillips 1 * Gemma Carroll 2,3 Ian Jonsen 1 Robert Harcourt 1 Moninya Roughan 4
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