Circulation mechanisms for decadal time scale changes in oxygen minimum zones (A09)

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The key question of A9 is how much of the oxygen variability and trends that have been observed in the oxygen minimum zones (OMZs) in both the tropical North Atlantic and tropical South Pacific in recent decades, including the first two phases of the SFB 754, can be attributed to changes in ocean circulation. We are interested in changes associated with both the eddy-driven latitudinally alternating zonal jets (LAZJs) and the large-scale climate modes. To address this question, it is planned to analyze observational data and ocean model simulations from all phases of the SFB 754 and to carry out additional high-resolution process modelling.