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. Understanding phytoplankton dynamics is critical across a rangeof topics, spanning from fishery management to climate change mitigation. It isparticularly interesting in the East Australian Current (EAC) system, as the region'seddy field strongly conditions nutrient availability and therefore phytoplankton growth.Numerical models provide unparalleled insight into these biogeochemical dynamics. Yet, todate, modelling efforts off southeastern Australia have either targeted case studies(small spatial and temporal scales) or encompassed the whole EAC system but focused onclimate change effects at the mesoscale (with a spatial resolution of 1 / 10 ∘ ).Here we couple a model of the pelagic nitrogen cycle (bio_Fennel) to a 10-yearhigh-resolution (2.5–5 km horizontal) three-dimensional ocean model (ROMS) to resolveboth regional and finer-scale biogeochemical processes occurring in the EAC system. Weuse several statistical metrics to compare the simulated surface chlorophyll to an oceancolour dataset (Copernicus-GlobColour) for the 2003–2011 period and show that the modelcan reproduce the observed phytoplankton surface patterns with a domain-wide RMSE ofapproximately 0.2 mg Chl  a  m −3 and a correlation coefficient of 0.76.This coupled configuration will provide a much-needed framework to examine phytoplanktonvariability in the EAC system providing insight into important ecosystem dynamics such asregional nutrient supply mechanisms and biogeochemical cycling occurring in EAC eddies.

A high-resolution biogeochemical model (ROMS 3.4 + bio_Fennel) of the East Australian Current system