A new look at the PV distribution in the World Ocean
In this study, we revisit early works from the late 1980s about potential vorticity (PV) homogenization in the World Ocean using ARGO data and a hierarchy of coupled ocean-atmosphere models (MITgcm in idealised geometry and HadGEM3). Specifically, we focus on a new index of PV homogenization along isopycnals which we apply to the water column globally. The analysis indicates a striking partitioning of this index among different ocean basins, with highest PV homogenization observed in the North Pacific and the South Atlantic, and a weak degree of homogenization observed throughout the Southern Ocean. A rich behaviour is revealed in the North Atlantic and South Pacific basins.