Fig 4. Spatial extent of shallow (100-200m) low dissolved oxygen layers stretching from the tropics to the subtropics.
Data (blue dots) sourced from all available ARGO floats with oxygen in the region and cruise voyages conducted on the Southern Surveyor in 2010, 2011, 2012 and 2013. The red rectangle indicates the latitudinal area where a longitudinal slice through the water column has been analysed. Low dissolved oxygen layers (μmol kg-1) are highlighted by black circles.