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- W2280415790 abstract "Oxygen minimum zones exert important controls over ocean biogeochemistry. Lagrangian modelling demonstrates that the mean positions of mesoscale eddies delimit the boundaries of the Peruvian oxygen minimum zone. Dissolved oxygen in sea water affects marine habitats and biogeochemical cycles1,2,3. Oceanic zones with oxygen deficits represent 7% of the volume and 8% of the area of the oceans4, and are thought to be expanding4,5. One of the most pronounced lies in the region off Peru, where mesoscale activity in the form of fronts and eddies is strong. Here, we study the dynamics of the Peruvian oxygen minimum zone in a Lagrangian framework, using a coupled physical–biogeochemical numerical model and finite-size Lyapunov exponent fields, to evaluate the role of mesoscale activity. We find that, at depths between 380 and 600 m, mesoscale structures have two distinct roles. First, their mean positions and paths delimit and maintain the oxygen minimum zone boundaries. Second, their high-frequency fluctuations inject oxygen across the oxygen minimum zone boundaries and eddy fluxes are one order of magnitude higher than mean oxygen fluxes. We conclude that these eddy fluxes contribute to the ventilation of the Peruvian oxygen minimum zone." @default.
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- W2280415790 date "2015-11-02" @default.
- W2280415790 modified "2023-10-17" @default.
- W2280415790 title "Boundaries of the Peruvian oxygen minimum zone shaped by coherent mesoscale dynamics" @default.
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- W2280415790 doi "https://doi.org/10.1038/ngeo2570" @default.
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