Earth's deepocean oxygen levels are declining, shows study NatureClimate
E. Black polygon=bathymetry across section; thin and thick black lines=neutral density contour of 28.30 kg m. Conservative temperature ; colour bar in panel . Absolute salinity ; colour bar in panel . Neutral density ; colour bar in panel . Bottom water varieties and flow direction shown schematically on panels -. Note different latitude scales.
Extended Data Fig. 6 Diagram showing approach that combines mooring, model, and hydrographic data to calculate volume transport of AABW. At each gateway section, the plume of AABW is measured by at least three repeat hydrographic stations and one deep mooring . The hydrographic profiles give temperature, salinity, neutral density, and oxygen as functions of latitude and pressure. The neutral density surface 28.30 kg mis used to define the top of the AABW layer and is used to estimate the vertical thickness of the water mass at each latitude,.
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